1658 lines
70 KiB
Python
1658 lines
70 KiB
Python
"""MiniMax-H3 (33B joint video+audio DiT) for ai-toolkit.
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Supports t2v (t2va) and first-frame i2v (fl2va) training and sampling, with
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joint audio when the dataset provides it. Image datasets train as single
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latent frames (keyframe-row geometry) and sampling with num_frames 1 renders
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a single image. The architecture lives in ./src/:
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- transformer.py: packed-sequence DiT, weight-compatible with the original
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``MiniMaxAI/MiniMax-H3`` checkpoint keys
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- vae.py / audio_vae.py: the video VAE (causal CNN encoder + ViT decoder,
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16x/17n+5->5n+2) and the waveform audio VAE (DAC/BigVGAN, 32 kHz, 40 Hz)
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- packing.py: packed-sequence geometry, rotary grids, sigma-shift math
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- text_encoder.py: Qwen3-VL-32B conditioning (unnormalized hidden_states[50],
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"<Picture i>: " + vision block presentation for keyframes)
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- pipeline.py: the released sampler (no CFG — the model is guidance-distilled)
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Weights load from the Comfy-Org repack (``Comfy-Org/MiniMax-H3``) by default:
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the pruned int8-ConvRot transformer, the nvfp4 AWQ Qwen3-VL text encoder (kept
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quantized through the toolkit's Ostris quantization backends — convrot8 and
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nvfp4 — with dequantized-matmul fallbacks for GPUs without the fast kernels),
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and the fp16/fp32 single-file VAEs. Files are resolved under ``MODELS_PATH``
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(checked first, both at the repo-relative location and flat at the root) and
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downloaded from the hub into ``MODELS_PATH`` when missing. Individual files
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can be overridden via ``model_kwargs``: ``dit_<partition>_path``,
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``text_encoder_path``, ``video_vae_path``, ``audio_vae_path``;
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``model_kwargs.partition`` picks ``fl2va``, ``fl2va_pruned`` (default),
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``ref2va``, or ``ref2va_pruned``.
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Conventions bridged to ai-toolkit:
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- the model consumes t = 1 - sigma in [0, 1] (t=1 clean) and predicts the
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data-ward velocity ``clean - noise``; ai-toolkit targets ``noise - clean``
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on a 0..1000 timestep scale, so timesteps are flipped and the prediction
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negated in get_noise_prediction
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- the audio stream runs on its own flow shift (3 vs video's 12): its sigma
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is derived per step from the video sigma via the closed-form remap, in
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training and sampling alike
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"""
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import os
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from functools import partial
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from typing import TYPE_CHECKING, List, Optional
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import torch
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import yaml
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from PIL import Image
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from safetensors.torch import load_file, save_file
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from toolkit.accelerator import unwrap_model
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from toolkit.advanced_prompt_embeds import AdvancedPromptEmbeds
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from toolkit.basic import flush
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from toolkit.config_modules import GenerateImageConfig, ModelConfig
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from toolkit.dto import DTO
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from toolkit.metadata import get_meta_for_safetensors
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from toolkit.models.base_model import BaseModel
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from toolkit.models.v2.text_encoders.qwen3_vl import Qwen3VLTextEncoder
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from toolkit.models.v2.resolver import (
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find_file_recursive,
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repo_id_from_name_or_path,
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resolve_comfy_file,
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)
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from toolkit.paths import MODELS_PATH
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from toolkit.util.comfy_quant_import import import_comfy_quantized_layers
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from toolkit.util.ostris_quant import OstrisLinear
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from toolkit.samplers.custom_flowmatch_sampler import (
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CustomFlowMatchEulerDiscreteScheduler,
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)
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from .src import packing
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packing_video_exts = [".mp4", ".avi", ".mov", ".webm", ".mkv", ".wmv", ".m4v", ".flv"]
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from .src.audio_vae import MiniMaxH3AudioVAE
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from .src.packing import (
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KEYFRAME_ENCODE_SEED,
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KEYFRAME_NOISE_AUG_T,
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build_packed_sequence,
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pack_audio_latents,
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pad_layouts_to_batch,
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unpack_audio_tokens,
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patchify_video_latents,
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remap_sigma,
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unpatchify_video_tokens,
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)
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from .src.pipeline import MiniMaxH3Pipeline
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from .src.ref_video_cache import (
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load_ref_video_latent,
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load_video_ref_for_te,
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ref_frame_indices,
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static_image_video_ref,
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)
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from .src.text_encoder import (
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TEXT_ENCODER_LAYER,
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VideoRef,
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encode_minimax_h3_prompt,
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load_video_ref,
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trim_caption_tokens,
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)
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from .src.transformer import MiniMaxH3Transformer, MiniMaxH3TransformerParams
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from .src.vae import MiniMaxH3VideoVAE
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if TYPE_CHECKING:
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from toolkit.data_transfer_object.data_loader import DataLoaderBatchDTO
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scheduler_config = {
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"num_train_timesteps": 1000,
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"shift": packing.VIDEO_SIGMA_SHIFT,
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"use_dynamic_shifting": False,
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}
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# Comfy-Org repack of the released weights, at ComfyUI's repo-relative paths
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# under MODELS_PATH (diffusion_models/, text_encoders/, vae/). Files are used
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# in place when present and downloaded to exactly these locations only when
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# missing.
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COMFY_REPO = "Comfy-Org/MiniMax-H3"
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COMFY_FILES = {
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"dit_fl2va": "diffusion_models/minimax_h3_fl2va_int8_convrot.safetensors",
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"dit_fl2va_pruned": "diffusion_models/minimax_h3_fl2va_pruned_int8_convrot.safetensors",
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"dit_ref2va": "diffusion_models/minimax_h3_ref2va_int8_convrot.safetensors",
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"dit_ref2va_pruned": "diffusion_models/minimax_h3_ref2va_pruned_int8_convrot.safetensors",
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"text_encoder": "text_encoders/qwen3vl_32b_minimax_h3_nvfp4_awq.safetensors",
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"video_vae": "vae/minimax_h3_video_vae_fp16.safetensors",
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"audio_vae": "vae/minimax_h3_audio_vae_fp32.safetensors",
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"dit_fasth3": "diffusion_models/minimax_h3_fasth3_preview_v0.2_int8_convrot.safetensors",
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}
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# FastH3 (FastVideo 4-step VSA distill) int8-convrot repack, produced by
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# scripts/convert_minimax_h2_fastvideo.py from the FastVideo diffusers repo.
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# Hub fallback repo for the file (flat at the repo root, downloaded into
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# MODELS_PATH/diffusion_models/); not published there yet — until it is, the
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# file must exist locally or be built with the converter.
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FASTH3_REPO = "Kijai/MiniMax-H3-experimental"
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FASTH3_SOURCE_REPO = "FastVideo/FastVideo-Minimax-FastH3-Preview-v0.2"
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# tokenizer/processor/text-encoder config come from the original repo (tiny files)
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ORIGINAL_REPO = "MiniMaxAI/MiniMax-H3"
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def new_save_image_function(
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self: GenerateImageConfig, image, count=0, max_count=0, **kwargs
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):
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# video (+ audio) previews save as mp4
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try:
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from diffusers.utils import encode_video
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except ImportError:
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from diffusers.pipelines.ltx2.export_utils import encode_video
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image["output_path"] = self.get_image_path(count, max_count)
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os.makedirs(os.path.dirname(image["output_path"]), exist_ok=True)
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if image.get("audio", None) is None:
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image.pop("audio", None)
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image.pop("audio_sample_rate", None)
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encode_video(**image)
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flush()
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def blank_log_image_function(self, *args, **kwargs):
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# todo handle wandb logging of videos with audio
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return
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class MiniMaxH3VaeBundle(torch.nn.Module):
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"""Holds both frozen autoencoders behind the single ``self.vae`` handle."""
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def __init__(self, video_vae: MiniMaxH3VideoVAE, audio_vae: MiniMaxH3AudioVAE):
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super().__init__()
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self.video_vae = video_vae
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self.audio_vae = audio_vae
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@property
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def device(self):
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return self.video_vae.device
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@property
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def dtype(self):
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return self.video_vae.dtype
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def enable_gradient_checkpointing(self, enable: bool = True):
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self.video_vae.enable_gradient_checkpointing(enable)
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self.audio_vae.enable_gradient_checkpointing(enable)
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def disable_gradient_checkpointing(self):
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self.enable_gradient_checkpointing(False)
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class MinimaxH3Model(BaseModel):
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arch = "minimax_h3"
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use_old_lokr_format = False
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def __init__(
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self,
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device,
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model_config: ModelConfig,
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dtype="bf16",
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custom_pipeline=None,
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noise_scheduler=None,
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**kwargs,
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):
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super().__init__(
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device, model_config, dtype, custom_pipeline, noise_scheduler, **kwargs
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)
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self.is_flow_matching = True
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self.is_transformer = True
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self.target_lora_modules = ["MiniMaxH3Transformer"]
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self.supports_model_paths = True
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# keyframes ride into the Qwen3-VL conditioning as vision blocks, so
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# sampling (and control_path datasets) pass control images to
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# get_prompt_embeds
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self.encode_control_in_text_embeddings = True
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self.processor = None # Qwen3VLProcessor
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self._warned_frame_trim = False
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# video-ref presentation context: dataset config while caching training
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# embeds; the sample's frame cap while encoding sample prompts
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self._ref_video_dataset_config = None
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self._sample_ref_max_frames = None
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self.latent_space_version = "minimax_h3_v1"
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# caption token cap (vision blocks are never truncated); the released
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# stack has no limit — set 0 to disable
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self.max_text_length = int(
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self.model_config.model_kwargs.get("max_text_length", 512)
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)
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@staticmethod
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def get_train_scheduler():
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return CustomFlowMatchEulerDiscreteScheduler(**scheduler_config)
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def get_bucket_divisibility(self):
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# 16x VAE spatial compression * 2x2 transformer patch
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return 32
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def get_frame_count_snapper(self):
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# auto_frame_count: snap dataset clips down to the VAE's 17n+5 grid
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return packing.align_num_frames_down
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def prepare_sample_prompt_context(self, gen_config):
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# sample prompts: video refs are treated at the sample's length, not
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# the dataset's (which only applies while caching training embeds)
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self._ref_video_dataset_config = None
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self._sample_ref_max_frames = max(int(gen_config.num_frames), 5)
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@property
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def video_vae(self) -> MiniMaxH3VideoVAE:
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return self.vae.video_vae
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@property
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def audio_vae(self) -> MiniMaxH3AudioVAE:
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return self.vae.audio_vae
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# ------------------------------------------------------------------
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# Loading
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# ------------------------------------------------------------------
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def _resolve_comfy_file(self, component: str) -> str:
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"""Find a weight file at its local location (model_kwargs override,
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comfy layout under MODELS_PATH or a local name_or_path dir), or
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download it there when (and only when) it is missing — see
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toolkit/models/v2/resolver.py for the search order."""
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name_or_path = self.model_config.name_or_path
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extra_roots = (
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[name_or_path] if name_or_path and os.path.isdir(name_or_path) else []
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)
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return resolve_comfy_file(
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COMFY_FILES[component],
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repo_id=repo_id_from_name_or_path(name_or_path, COMFY_REPO),
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override_path=self.model_config.model_kwargs.get(f"{component}_path", None),
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extra_roots=extra_roots,
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status_fn=self.print_and_status_update,
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)
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def _dit_component(self) -> str:
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partition = str(
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self.model_config.model_kwargs.get("partition", "fl2va_pruned")
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).lower()
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if partition not in ("fl2va", "fl2va_pruned", "ref2va", "ref2va_pruned"):
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raise ValueError(
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"model_kwargs.partition must be fl2va, fl2va_pruned, ref2va, "
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f"or ref2va_pruned, got {partition}"
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)
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return f"dit_{partition}"
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def load_training_adapter(self, transformer: MiniMaxH3Transformer):
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"""Load an assistant LoRA (e.g. a de-distillation adapter) as a LIVE
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module: active during training, deactivated by the sampler. It is
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deliberately NOT merged into the base weights — the transformer is
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pre-quantized, and a merge would resample every int8 scale.
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Path resolution: a local path is used as-is; otherwise the loras
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folder under MODELS_PATH is searched recursively for the filename;
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otherwise a ``user/repo/file.safetensors`` hub path downloads into
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MODELS_PATH/loras/training_adapters/.
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"""
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from toolkit.config_modules import NetworkConfig
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from toolkit.lora_special import LoRASpecialNetwork
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self.print_and_status_update("Loading assistant LoRA")
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lora_path = self.model_config.assistant_lora_path
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if not os.path.exists(lora_path):
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filename = os.path.basename(lora_path)
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found = find_file_recursive(os.path.join(MODELS_PATH, "loras"), filename)
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if found is not None:
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lora_path = found
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else:
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lora_splits = lora_path.split("/")
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if len(lora_splits) != 3:
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raise ValueError(
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f"Assistant LoRA path {lora_path} is not a local path, a "
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f"file under {os.path.join(MODELS_PATH, 'loras')}, or a "
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"'user/repo/file.safetensors' hub path."
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)
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import huggingface_hub
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target_dir = os.path.join(MODELS_PATH, "loras", "training_adapters")
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os.makedirs(target_dir, exist_ok=True)
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try:
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lora_path = huggingface_hub.hf_hub_download(
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repo_id="/".join(lora_splits[:2]),
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filename=lora_splits[2],
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local_dir=target_dir,
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)
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except Exception as e:
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raise ValueError(
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f"Failed to download assistant LoRA from {lora_path}: {e}"
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)
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self.model_config.assistant_lora_path = lora_path
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# load the adapter; it stays a live module (never merged) and the
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# sampler toggles it off for previews
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lora_state_dict = load_file(lora_path)
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dim_key = next(
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k
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for k in lora_state_dict
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if k.endswith("lora_A.weight") or k.endswith("lora_down.weight")
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)
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dim = int(lora_state_dict[dim_key].shape[0])
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lora_state_dict = self.convert_lora_weights_before_load(lora_state_dict)
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network_config = NetworkConfig(
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**{
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"type": "lora",
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"linear": dim,
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"linear_alpha": dim,
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"transformer_only": True,
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}
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)
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LoRASpecialNetwork.LORA_PREFIX_UNET = "lora_transformer"
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network = LoRASpecialNetwork(
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text_encoder=None,
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unet=transformer,
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lora_dim=network_config.linear,
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multiplier=1.0,
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alpha=network_config.linear_alpha,
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train_unet=True,
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train_text_encoder=False,
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network_config=network_config,
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network_type=network_config.type,
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transformer_only=network_config.transformer_only,
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is_transformer=True,
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target_lin_modules=self.target_lora_modules,
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is_assistant_adapter=True,
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is_ara=True,
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)
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network.apply_to(None, transformer, apply_text_encoder=False, apply_unet=True)
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network.force_to(self.device_torch, dtype=self.torch_dtype)
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network._update_torch_multiplier()
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network.load_weights(lora_state_dict)
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# frozen: the adapter shapes the training distribution but is never
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# itself trained, so its params must not collect gradients
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network.is_merged_in = False
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for param in network.parameters():
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param.requires_grad_(False)
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network.eval()
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self.assistant_lora: LoRASpecialNetwork = network
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# live during training; the sampler's non-inverted assistant path
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# (BaseModel.generate_images) deactivates it for previews and turns
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# it back on afterwards
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self.assistant_lora.multiplier = 1.0
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self.assistant_lora.is_active = True
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self.invert_assistant_lora = False
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def _load_transformer(self) -> MiniMaxH3Transformer:
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dit_path = self._resolve_comfy_file(self._dit_component())
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self.print_and_status_update(f"Loading transformer from {dit_path}")
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# the mixin single-file path: config sniffed from the checkpoint
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# (adaln_t_table), pre-quantized ConvRot linears attached, everything
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# else at its stored precision (the bf16/fp16/fp32 mix is deliberate)
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return MiniMaxH3Transformer.load_model(dit_path, dtype=self.torch_dtype)
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def _load_text_encoder(self):
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from accelerate import init_empty_weights
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from transformers import (
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AutoConfig,
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AutoProcessor,
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AutoTokenizer,
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Qwen3VLForConditionalGeneration,
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)
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tokenizer = AutoTokenizer.from_pretrained(
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ORIGINAL_REPO, subfolder="FL2VA/tokenizer"
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)
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processor = AutoProcessor.from_pretrained(
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ORIGINAL_REPO, subfolder="FL2VA/processor"
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)
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te_path = self.model_config.te_name_or_path
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if te_path is not None and os.path.isdir(te_path):
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# transformers-format folder (e.g. the original repo's text_encoder)
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self.print_and_status_update(
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f"Loading Qwen3-VL text encoder from {te_path}"
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)
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config = AutoConfig.from_pretrained(te_path)
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config.text_config.num_hidden_layers = TEXT_ENCODER_LAYER
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text_encoder = Qwen3VLTextEncoder.from_pretrained(
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te_path, config=config, torch_dtype=self.te_torch_dtype
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)
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else:
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if te_path is not None:
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te_file = te_path
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else:
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te_file = self._resolve_comfy_file("text_encoder")
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self.print_and_status_update(
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f"Loading Qwen3-VL text encoder from {te_file}"
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)
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# single-file ComfyUI checkpoint: 50 decoder layers, no final norm,
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# no lm_head; LM linears nvfp4 (AWQ), embeddings int8, vision bf16
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config = AutoConfig.from_pretrained(
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ORIGINAL_REPO, subfolder="FL2VA/text_encoder"
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)
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# only hidden_states[50] is consumed: truncate the decoder stack to
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# 50 layers; the final norm is neutralized below so
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# hidden_states[-1] stays the unnormalized layer-49 output
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config.text_config.num_hidden_layers = TEXT_ENCODER_LAYER
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config.tie_word_embeddings = False
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with init_empty_weights():
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text_encoder = Qwen3VLTextEncoder(config)
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|
text_encoder.lm_head = None
|
|
|
|
state_dict = load_file(te_file)
|
|
|
|
def key_map(prefix: str) -> str:
|
|
if prefix.startswith("model."):
|
|
return "model.language_model." + prefix[len("model.") :]
|
|
if prefix.startswith("visual."):
|
|
return "model." + prefix
|
|
return prefix
|
|
|
|
state_dict, num_quantized = import_comfy_quantized_layers(
|
|
text_encoder,
|
|
state_dict,
|
|
orig_dtype=self.te_torch_dtype,
|
|
key_map=key_map,
|
|
)
|
|
self.print_and_status_update(
|
|
f" - attached {num_quantized} pre-quantized nvfp4/int8 layers"
|
|
)
|
|
state_dict = {
|
|
key_map(k[: k.rfind(".")]) + k[k.rfind(".") :]: v
|
|
for k, v in state_dict.items()
|
|
}
|
|
result = text_encoder.load_state_dict(state_dict, assign=True, strict=False)
|
|
quantized_keys = set()
|
|
for name, m in text_encoder.named_modules():
|
|
if isinstance(m, OstrisLinear):
|
|
quantized_keys.add(f"{name}.weight")
|
|
allowed_missing_prefixes = (
|
|
"lm_head",
|
|
"model.language_model.norm",
|
|
"model.language_model.embed_tokens",
|
|
)
|
|
bad_missing = [
|
|
k
|
|
for k in result.missing_keys
|
|
if k not in quantized_keys
|
|
and not k.startswith(allowed_missing_prefixes)
|
|
]
|
|
if bad_missing or result.unexpected_keys:
|
|
raise ValueError(
|
|
f"MiniMax-H3 text encoder load mismatch: missing {bad_missing[:8]}, "
|
|
f"unexpected {result.unexpected_keys[:8]}"
|
|
)
|
|
del state_dict
|
|
text_encoder.model.language_model.norm = torch.nn.Identity()
|
|
text_encoder.eval()
|
|
text_encoder.requires_grad_(False)
|
|
flush()
|
|
return tokenizer, processor, text_encoder
|
|
|
|
def _load_vaes(self) -> MiniMaxH3VaeBundle:
|
|
self.print_and_status_update("Loading video VAE")
|
|
video_vae = MiniMaxH3VideoVAE.load_model(self._resolve_comfy_file("video_vae"))
|
|
self.print_and_status_update("Loading audio VAE")
|
|
audio_vae = MiniMaxH3AudioVAE.load_model(self._resolve_comfy_file("audio_vae"))
|
|
flush()
|
|
return MiniMaxH3VaeBundle(video_vae, audio_vae)
|
|
|
|
def load_model(self):
|
|
dtype = self.torch_dtype
|
|
self.print_and_status_update("Loading MiniMax-H3 model")
|
|
|
|
transformer = self._load_transformer()
|
|
|
|
# load assistant lora if specified (merged into the quantized weights)
|
|
if self.model_config.assistant_lora_path is not None:
|
|
self.load_training_adapter(transformer)
|
|
|
|
# quantize + offload + placement, all driven by model_config
|
|
transformer.aitk_post_load(**self.component_load_kwargs("transformer"))
|
|
flush()
|
|
|
|
tokenizer, processor, text_encoder = self._load_text_encoder()
|
|
if any(isinstance(m, OstrisLinear) for m in text_encoder.modules()):
|
|
# already nvfp4/int8 quantized; aitk_post_load skips quantize_te
|
|
text_encoder.aitk_is_quantized = True
|
|
# quantize + offload + placement, all driven by model_config
|
|
text_encoder.aitk_post_load(**self.component_load_kwargs("te"))
|
|
flush()
|
|
|
|
vae_bundle = self._load_vaes()
|
|
vae_bundle.to(self.vae_device_torch)
|
|
|
|
self.noise_scheduler = MinimaxH3Model.get_train_scheduler()
|
|
self.vae = vae_bundle
|
|
self.text_encoder = text_encoder
|
|
self.tokenizer = tokenizer
|
|
self.processor = processor
|
|
self.model = transformer
|
|
self.pipeline = MiniMaxH3Pipeline(self)
|
|
self.print_and_status_update("Model Loaded")
|
|
|
|
# ------------------------------------------------------------------
|
|
# Text conditioning
|
|
# ------------------------------------------------------------------
|
|
def _present_image_control(self, image: Image.Image):
|
|
"""Hook: how a control IMAGE enters the Qwen3-VL presentation. The
|
|
default is a plain ``<Picture i>`` image; ref2va can turn it into a
|
|
static video reference (``image_refs_as_video``)."""
|
|
return image
|
|
|
|
def get_prompt_embeds(self, prompt, control_images=None) -> AdvancedPromptEmbeds:
|
|
if isinstance(prompt, str):
|
|
prompt = [prompt]
|
|
if self.text_encoder.device == torch.device("cpu"):
|
|
self.text_encoder.to(self.device_torch)
|
|
|
|
# control tensors arrive in [0, 1]; the Qwen3-VL processor wants PIL
|
|
keyframes_per_prompt = [None] * len(prompt)
|
|
if control_images is not None:
|
|
if isinstance(control_images, torch.Tensor):
|
|
images = [control_images[i] for i in range(control_images.shape[0])]
|
|
elif isinstance(control_images, list):
|
|
images = [
|
|
c[0] if isinstance(c, torch.Tensor) and c.ndim == 4 else c
|
|
for c in control_images
|
|
]
|
|
else:
|
|
images = [control_images]
|
|
pil_images = []
|
|
for img in images:
|
|
if isinstance(img, torch.Tensor):
|
|
if img.ndim == 4:
|
|
img = img[0]
|
|
arr = (img.float().clamp(0, 1) * 255).round().to(torch.uint8)
|
|
pil_images.append(
|
|
self._present_image_control(
|
|
Image.fromarray(arr.permute(1, 2, 0).cpu().numpy())
|
|
)
|
|
)
|
|
elif isinstance(img, str):
|
|
# a control VIDEO path: 2 fps timestamped presentation over
|
|
# the SAME frames the latent rows use (dataset treatment
|
|
# when caching training embeds, sample-length at sampling)
|
|
ds_cfg = getattr(self, "_ref_video_dataset_config", None)
|
|
pil_images.append(
|
|
load_video_ref_for_te(
|
|
self, img, ds_cfg, max_frames=self._sample_ref_max_frames
|
|
)
|
|
)
|
|
else:
|
|
pil_images.append(img)
|
|
if len(pil_images) == 1:
|
|
keyframes_per_prompt = [pil_images] * len(prompt)
|
|
elif len(pil_images) == len(prompt):
|
|
keyframes_per_prompt = [[img] for img in pil_images]
|
|
else:
|
|
keyframes_per_prompt = [pil_images] * len(prompt)
|
|
|
|
embeds_list, tags_list = [], []
|
|
for p, keyframes in zip(prompt, keyframes_per_prompt):
|
|
embeds, tags = encode_minimax_h3_prompt(
|
|
self.text_encoder,
|
|
self.tokenizer,
|
|
self.processor,
|
|
p.strip(),
|
|
keyframes=keyframes,
|
|
device=self.device_torch,
|
|
dtype=self.torch_dtype,
|
|
max_length=self.max_text_length,
|
|
)
|
|
embeds_list.append(embeds)
|
|
tags_list.append(tags)
|
|
|
|
pe = AdvancedPromptEmbeds(text_embeds=embeds_list, text_token_tags=tags_list)
|
|
pe.frozen_dtype_keys = ["text_token_tags"]
|
|
return pe
|
|
|
|
# ------------------------------------------------------------------
|
|
# VAE encode / decode
|
|
# ------------------------------------------------------------------
|
|
@torch.no_grad()
|
|
def encode_images(self, image_list, device=None, dtype=None):
|
|
"""Images (C, H, W) or videos (T, C, H, W) in [-1, 1] -> normalized
|
|
video latents (B, 24, t, h, w). Video frame counts are trimmed down to
|
|
the VAE's 17n+5 grid when needed."""
|
|
if device is None:
|
|
device = self.vae_device_torch
|
|
if dtype is None:
|
|
dtype = self.vae_torch_dtype
|
|
if self.vae.device == torch.device("cpu"):
|
|
self.vae.to(self.vae_device_torch)
|
|
|
|
items = []
|
|
for image in image_list:
|
|
if image.ndim == 3:
|
|
items.append(image.unsqueeze(1)) # (C, 1, H, W)
|
|
elif image.ndim == 4:
|
|
items.append(image.permute(1, 0, 2, 3)) # (C, T, H, W)
|
|
else:
|
|
raise ValueError(f"Invalid image shape: {image.shape}")
|
|
|
|
num_frames = items[0].shape[1]
|
|
if num_frames > 1:
|
|
aligned = packing.align_num_frames_down(num_frames)
|
|
if aligned != num_frames and not self._warned_frame_trim:
|
|
print(
|
|
f"MiniMax-H3: trimming {num_frames}-frame clips to {aligned} "
|
|
f"frames (the video VAE needs 17n+5: 5, 22, 39, 56, ...). Set "
|
|
f"the dataset num_frames accordingly to avoid wasted decode."
|
|
)
|
|
self._warned_frame_trim = True
|
|
items = [it[:, :aligned] for it in items]
|
|
|
|
batch = torch.stack(items).to(self.vae_device_torch, self.video_vae.dtype)
|
|
latents = self.video_vae.encode(batch, sample=True)
|
|
return latents.to(device, dtype=dtype)
|
|
|
|
@torch.no_grad()
|
|
def encode_keyframe_latents(self, frames: torch.Tensor) -> torch.Tensor:
|
|
"""(B, 3, 1, H, W) in [-1, 1] -> normalized latents (B, 24, 1, h, w),
|
|
with the released conditioning recipe: seeded posterior sample (seed
|
|
42, independent of the request seed) rounded to fp16 before
|
|
normalization."""
|
|
if self.vae.device == torch.device("cpu"):
|
|
self.vae.to(self.vae_device_torch)
|
|
generator = torch.Generator(device="cpu").manual_seed(KEYFRAME_ENCODE_SEED)
|
|
latents = self.video_vae.encode(
|
|
frames.to(self.vae_device_torch, self.video_vae.dtype),
|
|
sample=True,
|
|
generator=generator,
|
|
fp16_round=True,
|
|
)
|
|
return latents.float()
|
|
|
|
def decode_latents(self, latents: torch.Tensor, device=None, dtype=None):
|
|
# differentiable: pixel-space losses backprop through the video VAE
|
|
if self.vae.device == torch.device("cpu"):
|
|
self.vae.to(self.vae_device_torch)
|
|
video = self.video_vae.decode(latents.to(self.vae.device, self.video_vae.dtype))
|
|
if device is not None:
|
|
video = video.to(device, dtype=dtype)
|
|
return video
|
|
|
|
def decode_audio_latents(self, latents: torch.Tensor):
|
|
# differentiable, like decode_latents
|
|
"""(B, 32, T) normalized -> waveform (B, 1, T*800) at 32 kHz."""
|
|
if self.vae.device == torch.device("cpu"):
|
|
self.vae.to(self.vae_device_torch)
|
|
return self.audio_vae.decode(latents.to(self.audio_vae.device, torch.float32))
|
|
|
|
@property
|
|
def audio_sample_rate(self) -> int:
|
|
return packing.AUDIO_SAMPLE_RATE
|
|
|
|
def decode_packed_audio_rows(self, rows: torch.Tensor) -> torch.Tensor:
|
|
# differentiable: audio perceptual losses backprop through the audio VAE
|
|
"""Packed channel-major audio rows (B, 2*T, 32) -> stereo waveform
|
|
(B, 2, T*800) at 32 kHz. Each stereo channel decodes as its own batch
|
|
item through the mono audio VAE."""
|
|
a_lat = rows.shape[1] // packing.AUDIO_CHANNELS
|
|
latents = unpack_audio_tokens(rows, a_lat) # (B, 2, 32, T)
|
|
b = latents.shape[0]
|
|
waveform = self.decode_audio_latents(
|
|
latents.reshape(b * packing.AUDIO_CHANNELS, latents.shape[2], a_lat)
|
|
) # (B*2, 1, samples)
|
|
return waveform.reshape(b, packing.AUDIO_CHANNELS, -1)
|
|
|
|
@torch.no_grad()
|
|
def encode_audio(self, audio_data_list):
|
|
"""[{"waveform": (C, L), "sample_rate": int}, ...] -> packed audio
|
|
rows (B, 2*T, 32), normalized, channel-major stereo."""
|
|
import torchaudio
|
|
|
|
if self.vae.device == torch.device("cpu"):
|
|
self.vae.to(self.device_torch)
|
|
|
|
packed = []
|
|
for audio_data in audio_data_list:
|
|
waveform = audio_data["waveform"].to(self.audio_vae.device, torch.float32)
|
|
sample_rate = int(audio_data["sample_rate"])
|
|
if waveform.dim() == 1:
|
|
waveform = waveform.unsqueeze(0)
|
|
if waveform.shape[0] == 1:
|
|
waveform = waveform.repeat(2, 1) # mono -> stereo
|
|
elif waveform.shape[0] > 2:
|
|
waveform = waveform[:2]
|
|
if sample_rate != packing.AUDIO_SAMPLE_RATE:
|
|
waveform = torchaudio.functional.resample(
|
|
waveform, sample_rate, packing.AUDIO_SAMPLE_RATE
|
|
)
|
|
# the mono VAE sees each stereo channel as its own batch item
|
|
z = self.audio_vae.encode(waveform.unsqueeze(1)) # (2, 32, T)
|
|
packed.append(pack_audio_latents(z.unsqueeze(0))) # (1, 2*T, 32)
|
|
|
|
max_len = max(p.shape[1] for p in packed)
|
|
packed = [
|
|
torch.nn.functional.pad(p, (0, 0, 0, max_len - p.shape[1])) for p in packed
|
|
]
|
|
return torch.cat(packed, dim=0).to(self.device_torch, self.torch_dtype)
|
|
|
|
# ------------------------------------------------------------------
|
|
# Training forward
|
|
# ------------------------------------------------------------------
|
|
def _build_condition(
|
|
self, batch: "DataLoaderBatchDTO", latent_shape, device, dtype
|
|
):
|
|
"""Build the packed sequence's condition segment for one train step.
|
|
|
|
``latent_shape`` is the target's ``(t_lat, h_lat, w_lat)``. Returns
|
|
``(cond_rows, cond_audio_rows, keyframe_anchors, ref_blocks)`` where ``cond_rows``
|
|
is ``(B, num_condition_rows, 96)`` or None. The base model implements
|
|
fl2va: the clip's first frame as a keyframe when the dataset asks for
|
|
i2v. MinimaxH3Ref2VAModel overrides this with image references from
|
|
the control images."""
|
|
do_i2v = (
|
|
batch is not None
|
|
and batch.dataset_config.do_i2v
|
|
and getattr(batch, "num_frames", 1) > 1
|
|
)
|
|
if not do_i2v:
|
|
return None, None, (), ()
|
|
|
|
if batch.first_frame_latents is not None:
|
|
first_latents = batch.first_frame_latents.to(device, torch.float32)
|
|
else:
|
|
frames = batch.tensor
|
|
if frames is None:
|
|
raise ValueError(
|
|
"do_i2v needs the first frame; no cached "
|
|
"first_frame_latents or raw tensors in batch"
|
|
)
|
|
first_frames = frames[:, 0] if frames.ndim == 5 else frames
|
|
first_latents = self.encode_keyframe_latents(
|
|
first_frames.unsqueeze(2).to(device)
|
|
)
|
|
if first_latents.ndim == 4:
|
|
first_latents = first_latents.unsqueeze(2)
|
|
cond_noise = torch.randn_like(first_latents)
|
|
first_latents = (
|
|
KEYFRAME_NOISE_AUG_T * first_latents
|
|
+ (1.0 - KEYFRAME_NOISE_AUG_T) * cond_noise
|
|
)
|
|
return patchify_video_latents(first_latents).to(dtype), None, ("first",), ()
|
|
|
|
def get_noise_prediction(
|
|
self,
|
|
latent_model_input: torch.Tensor, # (B, 24, t, h, w) noisy latents
|
|
timestep: torch.Tensor, # (B,) on the 0..1000 scale, 1000 = pure noise
|
|
text_embeddings: AdvancedPromptEmbeds,
|
|
batch: "DataLoaderBatchDTO" = None,
|
|
**kwargs,
|
|
):
|
|
device = self.device_torch
|
|
dtype = self.torch_dtype
|
|
if self.model.device == torch.device("cpu"):
|
|
self.model.to(device)
|
|
|
|
batch_size, _, t_lat, h_lat, w_lat = latent_model_input.shape
|
|
|
|
with torch.no_grad():
|
|
sigma_v = (timestep.to(device, torch.float32) / 1000.0).clamp(1e-6, 1.0)
|
|
if sigma_v.dim() == 0:
|
|
sigma_v = sigma_v.unsqueeze(0)
|
|
if sigma_v.shape[0] != batch_size:
|
|
sigma_v = sigma_v.expand(batch_size)
|
|
sigma_a = remap_sigma(sigma_v)
|
|
t_v = 1.0 - sigma_v
|
|
t_a = 1.0 - sigma_a
|
|
|
|
# --- conditioning rows (fl2va keyframe / ref2va references) ----
|
|
(
|
|
cond_rows,
|
|
cond_audio_rows,
|
|
keyframe_anchors,
|
|
ref_blocks,
|
|
) = self._build_condition(batch, (t_lat, h_lat, w_lat), device, dtype)
|
|
|
|
# --- audio rows -------------------------------------------------
|
|
if batch is not None and getattr(batch, "num_frames", None):
|
|
num_frames = batch.num_frames
|
|
else:
|
|
# invert 17n+5 -> 5n+2 from the latent frame count
|
|
num_frames = (t_lat - 2) // 5 * 17 + 5 if t_lat > 1 else 1
|
|
a_lat = packing.audio_latent_num_frames(num_frames)
|
|
# audio only trains for video batches from datasets that asked for
|
|
# it. Cached latents can carry audio after do_audio was turned off,
|
|
# and image (single frame) batches must never pick up a soundtrack
|
|
# — either way it rides along as silence with no audio loss.
|
|
do_audio = (
|
|
batch is not None
|
|
and batch.dataset_config is not None
|
|
and batch.dataset_config.do_audio
|
|
and num_frames > 1
|
|
)
|
|
raw_audio = None
|
|
if do_audio and batch.audio_latents is not None:
|
|
raw_audio = batch.audio_latents.to(device, torch.float32)
|
|
elif do_audio and getattr(batch, "audio_data", None) is not None:
|
|
raw_audio = self.encode_audio(batch.audio_data).to(
|
|
device, torch.float32
|
|
)
|
|
|
|
sa = sigma_a.view(-1, 1, 1)
|
|
audio_target = None
|
|
noisy_audio_rows = None
|
|
if raw_audio is not None:
|
|
expected_rows = a_lat * packing.AUDIO_CHANNELS
|
|
if raw_audio.shape[1] > expected_rows:
|
|
raw_audio = raw_audio[:, :expected_rows]
|
|
elif raw_audio.shape[1] < expected_rows:
|
|
raw_audio = torch.nn.functional.pad(
|
|
raw_audio, (0, 0, 0, expected_rows - raw_audio.shape[1])
|
|
)
|
|
# the audio noise is drawn once per step and shared by every
|
|
# pass (prior, primary, cfg/guidance, preservation) so they all
|
|
# see the same soundtrack and every pass's target matches. It
|
|
# rides on the latents DTO along with the trimmed audio so
|
|
# on-the-fly encodes aren't repeated per pass.
|
|
audio_noise = (
|
|
batch.latents.get("audio_noise")
|
|
if isinstance(batch.latents, DTO)
|
|
else None
|
|
)
|
|
if audio_noise is not None and audio_noise.shape == raw_audio.shape:
|
|
audio_noise = audio_noise.to(device, torch.float32)
|
|
else:
|
|
audio_noise = torch.randn_like(raw_audio)
|
|
if batch.latents is not None:
|
|
batch.latents = DTO(
|
|
batch.latents, audio=raw_audio, audio_noise=audio_noise
|
|
)
|
|
audio_rows = (1.0 - sa) * raw_audio + sa * audio_noise
|
|
# model predicts clean - noise; audio_pred is negated below so
|
|
# the target follows ai-toolkit's noise - clean convention
|
|
audio_target = (audio_noise - raw_audio).detach()
|
|
# what audio perceptual losses need to rebuild the clean
|
|
# estimate (x0 = noisy - sigma_a * pred); rides the pred DTO
|
|
noisy_audio_rows = audio_rows
|
|
else:
|
|
# no soundtrack: silence (zeros) noised at the audio sigma
|
|
# rides along without contributing to the loss
|
|
audio_rows = sa * torch.randn(
|
|
batch_size,
|
|
a_lat * packing.AUDIO_CHANNELS,
|
|
32,
|
|
device=device,
|
|
dtype=torch.float32,
|
|
)
|
|
|
|
# embeds cached with a longer max_text_length: cap the caption
|
|
# tail (vision blocks are never touched)
|
|
trimmed = [
|
|
trim_caption_tokens(e, t, self.max_text_length)
|
|
for e, t in zip(
|
|
text_embeddings.text_embeds, text_embeddings.text_token_tags
|
|
)
|
|
]
|
|
text_embed_list = [e for e, _ in trimmed]
|
|
text_tag_list = [t for _, t in trimmed]
|
|
|
|
# --- packed layout (per item: text lengths differ) --------------
|
|
layouts = []
|
|
for i in range(batch_size):
|
|
layouts.append(
|
|
build_packed_sequence(
|
|
text_token_tags=text_tag_list[i].to("cpu"),
|
|
num_latent_frames=t_lat,
|
|
latent_height=h_lat,
|
|
latent_width=w_lat,
|
|
num_audio_latents=a_lat,
|
|
keyframe_anchors=keyframe_anchors,
|
|
ref_blocks=ref_blocks,
|
|
)
|
|
)
|
|
(
|
|
position_ids,
|
|
token_tags,
|
|
video_indices,
|
|
audio_indices,
|
|
text_indices,
|
|
_,
|
|
) = pad_layouts_to_batch(layouts)
|
|
num_cond = layouts[0].num_condition_video_rows
|
|
num_cond_audio = layouts[0].num_condition_audio_rows
|
|
|
|
# per-row timesteps: text/video rows at t_v, audio rows at t_a,
|
|
# condition rows pinned at max(t_v, 0.999); ref soundtracks clean
|
|
row_t = t_v.view(-1, 1).expand(-1, token_tags.shape[1]).clone()
|
|
row_t[:, audio_indices] = t_a.view(-1, 1)
|
|
if num_cond > 0:
|
|
cond_t = torch.maximum(t_v, torch.full_like(t_v, KEYFRAME_NOISE_AUG_T))
|
|
row_t[:, video_indices[:num_cond]] = cond_t.view(-1, 1)
|
|
if num_cond_audio > 0:
|
|
row_t[:, audio_indices[:num_cond_audio]] = 1.0
|
|
audio_rows = torch.cat(
|
|
[cond_audio_rows.to(audio_rows.dtype), audio_rows], dim=1
|
|
)
|
|
|
|
# pad text embeds to the batch max length
|
|
max_text = int(text_indices.shape[0])
|
|
text_batch = torch.zeros(
|
|
batch_size,
|
|
max_text,
|
|
text_embed_list[0].shape[-1],
|
|
device=device,
|
|
dtype=dtype,
|
|
)
|
|
for i, emb in enumerate(text_embed_list):
|
|
text_batch[i, : emb.shape[0]] = emb.to(device, dtype)
|
|
|
|
video_rows = patchify_video_latents(
|
|
latent_model_input.to(device, torch.float32)
|
|
).to(dtype)
|
|
if cond_rows is not None:
|
|
video_rows = torch.cat([cond_rows, video_rows], dim=1)
|
|
|
|
video_pred, audio_pred = self.model(
|
|
hidden_states=video_rows,
|
|
audio_hidden_states=audio_rows.to(dtype),
|
|
encoder_hidden_states=text_batch,
|
|
row_timesteps=row_t.to(device),
|
|
token_tags=token_tags.to(device),
|
|
position_ids=position_ids.to(device),
|
|
video_indices=video_indices.to(device),
|
|
audio_indices=audio_indices.to(device),
|
|
text_indices=text_indices.to(device),
|
|
# target-video token grid (patch 1x2x2); consumed only by VSA models
|
|
vsa_video_grid=(t_lat, h_lat // 2, w_lat // 2),
|
|
)
|
|
|
|
if num_cond_audio > 0:
|
|
# reference soundtrack rows are conditioning, not targets
|
|
audio_pred = audio_pred[:, num_cond_audio:]
|
|
|
|
video_pred = video_pred[:, num_cond:]
|
|
noise_pred = unpatchify_video_tokens(video_pred, t_lat, h_lat, w_lat)
|
|
if audio_target is not None:
|
|
# every pass's DTO carries its own audio stream; preds flipped to
|
|
# ai-toolkit's noise - clean convention
|
|
return DTO(
|
|
-noise_pred,
|
|
audio=-audio_pred,
|
|
audio_target=audio_target,
|
|
audio_noisy=noisy_audio_rows,
|
|
audio_sigma=sigma_a,
|
|
)
|
|
return -noise_pred
|
|
|
|
def get_loss_target(self, *args, **kwargs):
|
|
noise = kwargs.get("noise")
|
|
batch = kwargs.get("batch")
|
|
return (noise - batch.latents).detach()
|
|
|
|
# ------------------------------------------------------------------
|
|
# Sampling (training previews)
|
|
# ------------------------------------------------------------------
|
|
def get_generation_pipeline(self):
|
|
return MiniMaxH3Pipeline(self)
|
|
|
|
def generate_single_image(
|
|
self,
|
|
pipeline: MiniMaxH3Pipeline,
|
|
gen_config: GenerateImageConfig,
|
|
conditional_embeds: AdvancedPromptEmbeds,
|
|
unconditional_embeds: AdvancedPromptEmbeds,
|
|
generator: torch.Generator,
|
|
extra: dict,
|
|
):
|
|
if self.model.device == torch.device("cpu"):
|
|
self.model.to(self.device_torch)
|
|
|
|
sc = self.get_bucket_divisibility()
|
|
gen_config.width = max(sc, int(gen_config.width // sc * sc))
|
|
gen_config.height = max(sc, int(gen_config.height // sc * sc))
|
|
|
|
is_video = gen_config.num_frames > 1
|
|
if is_video:
|
|
gen_config.num_frames = packing.align_num_frames_down(gen_config.num_frames)
|
|
gen_config.fps = packing.FPS
|
|
gen_config.save_image = partial(new_save_image_function, gen_config)
|
|
gen_config.log_image = partial(blank_log_image_function, gen_config)
|
|
gen_config.output_ext = "mp4"
|
|
|
|
ctrl_img = None
|
|
if gen_config.ctrl_img is not None:
|
|
ctrl_img = Image.open(gen_config.ctrl_img).convert("RGB")
|
|
ctrl_img = packing.prepare_keyframe_image(
|
|
ctrl_img, gen_config.height, gen_config.width, stretch=True
|
|
)
|
|
|
|
with_audio = bool(self.model_config.model_kwargs.get("sample_audio", True))
|
|
|
|
result = pipeline(
|
|
conditional_embeds=conditional_embeds,
|
|
unconditional_embeds=unconditional_embeds,
|
|
height=gen_config.height,
|
|
width=gen_config.width,
|
|
num_frames=gen_config.num_frames,
|
|
num_inference_steps=gen_config.num_inference_steps,
|
|
guidance_scale=gen_config.guidance_scale,
|
|
latents=gen_config.latents,
|
|
generator=generator,
|
|
ctrl_img=ctrl_img,
|
|
with_audio=with_audio and is_video,
|
|
)
|
|
if is_video:
|
|
return result # dict consumed by new_save_image_function
|
|
return result[0]
|
|
|
|
# ------------------------------------------------------------------
|
|
# Saving / bookkeeping
|
|
# ------------------------------------------------------------------
|
|
def get_model_has_grad(self):
|
|
return False
|
|
|
|
def get_te_has_grad(self):
|
|
return False
|
|
|
|
def save_model(self, output_path, meta, save_dtype):
|
|
from toolkit.util.quantize import dequantize_if_quantized
|
|
|
|
transformer: MiniMaxH3Transformer = unwrap_model(self.model)
|
|
os.makedirs(os.path.join(output_path, "transformer"), exist_ok=True)
|
|
state_dict = transformer.state_dict()
|
|
save_dict = {}
|
|
for k, v in state_dict.items():
|
|
v = dequantize_if_quantized(v)
|
|
if v.is_floating_point() and not k.startswith(
|
|
MiniMaxH3Transformer.FP32_KEY_PREFIXES
|
|
):
|
|
v = v.to(save_dtype)
|
|
save_dict[k] = v.clone().to("cpu")
|
|
meta_st = get_meta_for_safetensors(meta, name="minimax_h3")
|
|
save_file(
|
|
save_dict,
|
|
os.path.join(output_path, "transformer", "model.safetensors"),
|
|
metadata=meta_st,
|
|
)
|
|
with open(os.path.join(output_path, "aitk_meta.yaml"), "w") as f:
|
|
yaml.dump(meta, f)
|
|
|
|
def get_base_model_version(self):
|
|
return "minimax_h3"
|
|
|
|
def get_transformer_block_names(self) -> Optional[List[str]]:
|
|
return ["blocks"]
|
|
|
|
def get_quantization_exclude_modules(self) -> Optional[List[str]]:
|
|
# float32 islands, the conditioning projection, the token refiner and
|
|
# the AdaLN projections — all shipped unquantized in the pre-quantized
|
|
# checkpoints (pruned files carry tiny fp16 adaln linears fed by the
|
|
# 8-dim time table), so excluding them makes quantize with the
|
|
# checkpoint's own qtype an exact no-op and keeps the sensitive
|
|
# modulation path at full precision under any other qtype.
|
|
return [
|
|
"video_patch_proj*",
|
|
"audio_patch_proj*",
|
|
"time_embedder*",
|
|
"final_layer*",
|
|
"condition_proj*",
|
|
"token_refiner*",
|
|
"*adaln_proj*",
|
|
]
|
|
|
|
# ComfyUI's MiniMax-H3 keys are the original checkpoint keys, so the
|
|
# standard diffusion_model prefix maps directly
|
|
lora_keys_use_comfy_prefix = True
|
|
|
|
|
|
class MinimaxH3Ref2VAModel(MinimaxH3Model):
|
|
"""Reference-to-video (ref2va): the control images ride along as reference
|
|
blocks in the packed sequence (plus ``<Picture i>: `` vision blocks in the
|
|
Qwen3-VL conditioning) instead of anchoring the first frame.
|
|
|
|
Image references only for now. Every reference keeps its OWN aspect ratio
|
|
and is resized to the TARGET's pixel area (axes snapped to /32), then sits
|
|
on its own aspect-normalized rotary grid — like the released ref2va's
|
|
per-reference grids, but area-matched to the target instead of the 2048px
|
|
reference short edge. Each reference block advances the rotary media
|
|
clock by 1.0.
|
|
|
|
At sampling, ctrl images are ALWAYS references, never first frames.
|
|
|
|
``model_kwargs.image_refs_as_video`` (default off) routes still-image
|
|
references through the VIDEO reference path instead: the image is held
|
|
for ``image_ref_video_frames`` frames (17n+5, default 5) as a silent
|
|
static clip — video sizing (true area match), multi-frame latent block,
|
|
temporal-span rotary advance, and a ``<Video k>: `` timestamped Qwen
|
|
presentation — so a LoRA trained on image references exercises the same
|
|
pathway that video references use at inference.
|
|
"""
|
|
|
|
arch = "minimax_h3_ref2va"
|
|
|
|
def _image_ref_video_frames(self) -> int:
|
|
"""Frames a still reference is held for when presented as a static
|
|
video (0 = keep native ``<Picture>`` image references)."""
|
|
kw = self.model_config.model_kwargs
|
|
if not bool(kw.get("image_refs_as_video", False)):
|
|
return 0
|
|
return packing.align_num_frames_down(int(kw.get("image_ref_video_frames", 5)))
|
|
|
|
@property
|
|
def text_embedding_space_version(self):
|
|
# the presentation of image references changes the embeds -> new cache key
|
|
n = self._image_ref_video_frames()
|
|
if n:
|
|
return f"{self.arch}:img_as_vid{n}"
|
|
return self.arch
|
|
|
|
def _present_image_control(self, image: Image.Image):
|
|
n = self._image_ref_video_frames()
|
|
if n:
|
|
return static_image_video_ref(image, n, fps=packing.FPS)
|
|
return image
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
super().__init__(*args, **kwargs)
|
|
# references arrive as a list per sample (multi_control_paths), at
|
|
# their ORIGINAL size — this model does its own area-matched resize
|
|
self.has_multiple_control_images = True
|
|
self.use_raw_control_images = True
|
|
# control VIDEOS are cached like dataset items and consumed as
|
|
# multi-frame reference blocks
|
|
self.supports_video_control_images = True
|
|
# D-OPSD: a no-grad teacher pass with the target as its own reference
|
|
# becomes the training target for the reference-free student pass
|
|
self.dopsd = bool(self.model_config.model_kwargs.get("dopsd", False))
|
|
if self.dopsd:
|
|
self.dopsd_self_ref = True
|
|
self.require_pixel_tensor_cache = True
|
|
self.dopsd_bleed_strength = float(
|
|
self.model_config.model_kwargs.get("dopsd_bleed_strength", 1.0)
|
|
)
|
|
|
|
def _dit_component(self) -> str:
|
|
partition = str(
|
|
self.model_config.model_kwargs.get("partition", "ref2va_pruned")
|
|
).lower()
|
|
if partition not in ("ref2va", "ref2va_pruned"):
|
|
raise ValueError(
|
|
f"model_kwargs.partition must be ref2va or ref2va_pruned for "
|
|
f"{self.arch}, got {partition}"
|
|
)
|
|
return f"dit_{partition}"
|
|
|
|
def get_base_model_version(self):
|
|
return "minimax_h3_ref2va"
|
|
|
|
def _build_condition(
|
|
self, batch: "DataLoaderBatchDTO", latent_shape, device, dtype
|
|
):
|
|
# raw-size control tensors in [0, 1]; each is resized to the TARGET's
|
|
# pixel area with its own aspect kept, then encoded on its own grid
|
|
if batch is None:
|
|
return None, None, (), ()
|
|
if getattr(batch, "dopsd_teacher_pass", False):
|
|
return self._build_dopsd_teacher_condition(
|
|
batch, latent_shape, device, dtype
|
|
)
|
|
controls_per_item = None
|
|
if batch.control_tensor_list is not None:
|
|
controls_per_item = batch.control_tensor_list
|
|
elif batch.control_tensor is not None:
|
|
controls_per_item = [
|
|
[batch.control_tensor[b]] for b in range(batch.control_tensor.shape[0])
|
|
]
|
|
if not controls_per_item:
|
|
controls_per_item = (
|
|
[[] for _ in batch.file_items] if batch.file_items else []
|
|
)
|
|
if not controls_per_item:
|
|
return None, None, (), ()
|
|
ref_count = len(controls_per_item[0])
|
|
if any(len(c) != ref_count for c in controls_per_item):
|
|
raise ValueError(
|
|
"ref2va: every item in a batch must have the same number of "
|
|
"reference images"
|
|
)
|
|
|
|
_, h_lat, w_lat = latent_shape
|
|
target_h, target_w = h_lat * 16, w_lat * 16
|
|
# still refs as static video clips: video sizing + multi-frame block
|
|
as_video_frames = self._image_ref_video_frames()
|
|
size_fn = (
|
|
packing.reference_video_pixel_size
|
|
if as_video_frames
|
|
else packing.reference_pixel_size
|
|
)
|
|
|
|
all_rows = []
|
|
blocks = []
|
|
for ref_idx in range(ref_count):
|
|
resized = []
|
|
for c in controls_per_item:
|
|
img = c[ref_idx]
|
|
if img.ndim == 4:
|
|
img = img[0]
|
|
ph, pw = size_fn(img.shape[2], img.shape[1], target_h, target_w)
|
|
# LANCZOS like ComfyUI / the sampling path
|
|
resized.append(
|
|
torch.nn.functional.interpolate(
|
|
img[None].to(device, torch.float32),
|
|
size=(ph, pw),
|
|
mode="bicubic",
|
|
antialias=True,
|
|
)[0].clamp(0.0, 1.0)
|
|
)
|
|
shapes = {tuple(r.shape[1:]) for r in resized}
|
|
if len(shapes) > 1:
|
|
raise ValueError(
|
|
"ref2va: reference aspect ratios must match across a batch "
|
|
f"(got pixel shapes {sorted(shapes)}); use batch_size 1 for "
|
|
"mixed-aspect references"
|
|
)
|
|
# [0, 1] control -> [-1, 1] pixels; (B, 3, T, H, W) with T = 1
|
|
# for a keyframe-style image ref, or the still held for
|
|
# ``image_ref_video_frames`` frames as a static clip
|
|
frames = (torch.stack(resized) * 2.0 - 1.0).unsqueeze(2)
|
|
if as_video_frames:
|
|
frames = frames.expand(-1, -1, as_video_frames, -1, -1).contiguous()
|
|
ref_latents = self.encode_keyframe_latents(frames)
|
|
ref_noise = torch.randn_like(ref_latents)
|
|
ref_latents = (
|
|
KEYFRAME_NOISE_AUG_T * ref_latents
|
|
+ (1.0 - KEYFRAME_NOISE_AUG_T) * ref_noise
|
|
)
|
|
blocks.append(
|
|
(ref_latents.shape[2], ref_latents.shape[3], ref_latents.shape[4], 0)
|
|
)
|
|
all_rows.append(patchify_video_latents(ref_latents).to(dtype))
|
|
|
|
audio_rows = []
|
|
self._append_video_ref_blocks(
|
|
batch, all_rows, audio_rows, blocks, device, dtype, target_h, target_w
|
|
)
|
|
if not all_rows:
|
|
return None, None, (), ()
|
|
cond_audio = torch.cat(audio_rows, dim=1) if audio_rows else None
|
|
return torch.cat(all_rows, dim=1), cond_audio, (), tuple(blocks)
|
|
|
|
def _build_dopsd_teacher_condition(self, batch, latent_shape, device, dtype):
|
|
"""D-OPSD teacher: the target is its own (only) reference, built from
|
|
the batch's cached pixel tensors; its soundtrack rides as clean
|
|
reference audio rows."""
|
|
if batch.tensor is None:
|
|
raise ValueError(
|
|
"D-OPSD teacher pass needs pixel tensors on the batch; set "
|
|
"cache_tensors_to_disk: true on this dataset"
|
|
)
|
|
px = batch.tensor.detach().to(device, torch.float32)
|
|
if px.ndim == 4:
|
|
# image items: single-frame ref, or a static clip for image_refs_as_video
|
|
frames = px.unsqueeze(2)
|
|
as_video_frames = self._image_ref_video_frames()
|
|
if as_video_frames:
|
|
frames = frames.expand(-1, -1, as_video_frames, -1, -1).contiguous()
|
|
else:
|
|
# video items: (B, T, C, H, W) -> (B, C, T, H, W)
|
|
frames = px.permute(0, 2, 1, 3, 4).contiguous()
|
|
ref_latents = self.encode_keyframe_latents(frames)
|
|
ref_noise = torch.randn_like(ref_latents)
|
|
ref_latents = (
|
|
KEYFRAME_NOISE_AUG_T * ref_latents
|
|
+ (1.0 - KEYFRAME_NOISE_AUG_T) * ref_noise
|
|
)
|
|
audio_rows = None
|
|
a_lat = 0
|
|
if (
|
|
batch.dataset_config is not None
|
|
and batch.dataset_config.do_audio
|
|
and batch.audio_latents is not None
|
|
and getattr(batch, "num_frames", 1) > 1
|
|
):
|
|
a_lat = packing.audio_latent_num_frames(batch.num_frames)
|
|
audio_rows = torch.stack(
|
|
[
|
|
self._fit_audio_rows(
|
|
batch.audio_latents[b].detach().to(device, torch.float32),
|
|
a_lat,
|
|
)
|
|
for b in range(batch.audio_latents.shape[0])
|
|
]
|
|
).to(dtype)
|
|
blocks = (
|
|
(ref_latents.shape[2], ref_latents.shape[3], ref_latents.shape[4], a_lat),
|
|
)
|
|
return patchify_video_latents(ref_latents).to(dtype), audio_rows, (), blocks
|
|
|
|
@torch.no_grad()
|
|
def _encode_ref_video_for_sampling(self, path: str, gen_config) -> torch.Tensor:
|
|
"""Decode a reference video with the SAME temporal treatment training
|
|
uses (real-time pacing from frame 0 at 24 fps, tail trimmed, snapped
|
|
down to 17n+5, capped at the sample's frame count), area-match it to
|
|
the target with its own aspect, and encode with the released keyframe
|
|
recipe. Returns normalized latents (C, T, h, w)."""
|
|
import cv2
|
|
import numpy as np
|
|
|
|
cap = cv2.VideoCapture(path)
|
|
if not cap.isOpened():
|
|
raise ValueError(f"Could not open reference video {path}")
|
|
total = int(cap.get(cv2.CAP_PROP_FRAME_COUNT))
|
|
src_fps = cap.get(cv2.CAP_PROP_FPS) or packing.FPS
|
|
n = int(total / src_fps * packing.FPS)
|
|
n = packing.align_num_frames_down(min(n, max(gen_config.num_frames, 5)))
|
|
indices = ref_frame_indices(total, src_fps, n, packing.FPS, trim_tail=True)
|
|
from .src.ref_video_cache import read_frames_at
|
|
|
|
frames = [
|
|
cv2.cvtColor(f, cv2.COLOR_BGR2RGB) for f in read_frames_at(cap, indices)
|
|
]
|
|
cap.release()
|
|
h0, w0 = frames[0].shape[:2]
|
|
# match the sample canvas's pixel area, own aspect kept
|
|
ph, pw = packing.reference_video_pixel_size(
|
|
w0, h0, gen_config.height, gen_config.width
|
|
)
|
|
pixels = torch.from_numpy(np.stack(frames)).float() / 255.0 * 2.0 - 1.0
|
|
pixels = pixels.permute(3, 0, 1, 2)[None] # (1, 3, T, H, W)
|
|
pixels = (
|
|
torch.nn.functional.interpolate(
|
|
pixels.reshape(1 * 3, len(frames), h0, w0).transpose(0, 1),
|
|
size=(ph, pw),
|
|
mode="bilinear",
|
|
antialias=True,
|
|
)
|
|
.transpose(0, 1)
|
|
.reshape(1, 3, len(frames), ph, pw)
|
|
)
|
|
generator = torch.Generator(device="cpu").manual_seed(KEYFRAME_ENCODE_SEED)
|
|
latents = self.video_vae.encode(
|
|
pixels.to(self.vae.device, self.video_vae.dtype),
|
|
sample=True,
|
|
generator=generator,
|
|
fp16_round=True,
|
|
)
|
|
# soundtrack rides clean when the clip has one (same test as the TE label)
|
|
audio_rows = None
|
|
try:
|
|
from .src.text_encoder import video_has_audio
|
|
|
|
if not video_has_audio(path):
|
|
raise RuntimeError("no audio stream")
|
|
import torchaudio
|
|
|
|
waveform, sample_rate = torchaudio.load(path)
|
|
# frames cover [0, n / 24) seconds; trim the soundtrack to the
|
|
# same window (matches the training cache) before encoding
|
|
keep = int(round(n / packing.FPS * sample_rate))
|
|
waveform = waveform[:, :keep]
|
|
rows = self.encode_audio(
|
|
[{"waveform": waveform, "sample_rate": sample_rate}]
|
|
)[0]
|
|
a_lat = packing.audio_latent_num_frames(n)
|
|
audio_rows = self._fit_audio_rows(rows.float(), a_lat)
|
|
except Exception:
|
|
pass
|
|
return {"latent": latents[0].float(), "audio_rows": audio_rows}
|
|
|
|
@torch.no_grad()
|
|
def _encode_static_image_ref_for_sampling(
|
|
self, image: Image.Image, gen_config
|
|
) -> dict:
|
|
"""A still ctrl image as a silent static reference clip
|
|
(``image_refs_as_video``): held for ``image_ref_video_frames`` frames,
|
|
video-sized to the target's pixel area with its own aspect, encoded
|
|
with the released keyframe recipe. Same shape of entry as
|
|
:meth:`_encode_ref_video_for_sampling`."""
|
|
import numpy as np
|
|
|
|
n = self._image_ref_video_frames()
|
|
ph, pw = packing.reference_video_pixel_size(
|
|
image.size[0], image.size[1], gen_config.height, gen_config.width
|
|
)
|
|
if image.size != (pw, ph):
|
|
image = image.resize((pw, ph), Image.Resampling.LANCZOS)
|
|
pixels = torch.from_numpy(np.asarray(image)).float() / 255.0 * 2.0 - 1.0
|
|
pixels = pixels.permute(2, 0, 1)[None, :, None] # (1, 3, 1, H, W)
|
|
pixels = pixels.expand(-1, -1, n, -1, -1).contiguous()
|
|
latents = self.encode_keyframe_latents(pixels)
|
|
return {"latent": latents[0].float(), "audio_rows": None}
|
|
|
|
def _append_video_ref_blocks(
|
|
self, batch, all_rows, audio_rows, blocks, device, dtype, target_h, target_w
|
|
):
|
|
# control videos get the dataset's temporal treatment (frame count,
|
|
# fps), are area-matched to the target, and get one VAE encode
|
|
# disk-cached next to the video; the
|
|
# resulting latents become multi-frame reference blocks packed after
|
|
# the image references
|
|
paths_per_item = getattr(batch, "control_video_paths_list", None)
|
|
if not paths_per_item:
|
|
return
|
|
vid_count = len(paths_per_item[0])
|
|
if any(len(v) != vid_count for v in paths_per_item):
|
|
raise ValueError(
|
|
"ref2va: every item in a batch must have the same number of "
|
|
"reference videos"
|
|
)
|
|
for ref_idx in range(vid_count):
|
|
lats = []
|
|
auds = []
|
|
for per_item in paths_per_item:
|
|
entry = load_ref_video_latent(
|
|
self, per_item[ref_idx], batch.dataset_config, target_h, target_w
|
|
)
|
|
lats.append(entry["latent"].to(device, torch.float32))
|
|
auds.append(entry.get("audio_rows"))
|
|
shapes = {tuple(l.shape) for l in lats}
|
|
if len(shapes) > 1:
|
|
raise ValueError(
|
|
"ref2va: reference video latent shapes must match across a "
|
|
f"batch (got {sorted(shapes)}); use batch_size 1"
|
|
)
|
|
ref_latents = torch.stack(lats) # (B, C, T, h, w)
|
|
ref_noise = torch.randn_like(ref_latents)
|
|
ref_latents = (
|
|
KEYFRAME_NOISE_AUG_T * ref_latents
|
|
+ (1.0 - KEYFRAME_NOISE_AUG_T) * ref_noise
|
|
)
|
|
# soundtrack rows ride clean when every item in the batch has them
|
|
a_lat = 0
|
|
if all(a is not None for a in auds):
|
|
a_lat = packing.audio_latent_num_frames(entry["num_frames"])
|
|
trimmed = [
|
|
self._fit_audio_rows(a.to(device, torch.float32), a_lat)
|
|
for a in auds
|
|
]
|
|
if len({t.shape for t in trimmed}) == 1:
|
|
audio_rows.append(torch.stack(trimmed).to(dtype))
|
|
else:
|
|
a_lat = 0
|
|
blocks.append(
|
|
(
|
|
ref_latents.shape[2],
|
|
ref_latents.shape[3],
|
|
ref_latents.shape[4],
|
|
a_lat,
|
|
)
|
|
)
|
|
all_rows.append(patchify_video_latents(ref_latents).to(dtype))
|
|
|
|
@staticmethod
|
|
def _fit_audio_rows(rows: torch.Tensor, a_lat: int) -> torch.Tensor:
|
|
"""Trim/pad channel-major packed rows (2*T, C) to 2*a_lat rows,
|
|
per stereo channel."""
|
|
t = rows.shape[0] // 2
|
|
per_ch = rows.reshape(2, t, rows.shape[-1])
|
|
if t > a_lat:
|
|
per_ch = per_ch[:, :a_lat]
|
|
elif t < a_lat:
|
|
per_ch = torch.nn.functional.pad(per_ch, (0, 0, 0, a_lat - t))
|
|
return per_ch.reshape(2 * a_lat, rows.shape[-1])
|
|
|
|
def generate_single_image(
|
|
self,
|
|
pipeline: MiniMaxH3Pipeline,
|
|
gen_config: GenerateImageConfig,
|
|
conditional_embeds: AdvancedPromptEmbeds,
|
|
unconditional_embeds: AdvancedPromptEmbeds,
|
|
generator: torch.Generator,
|
|
extra: dict,
|
|
):
|
|
if self.model.device == torch.device("cpu"):
|
|
self.model.to(self.device_torch)
|
|
|
|
sc = self.get_bucket_divisibility()
|
|
gen_config.width = max(sc, int(gen_config.width // sc * sc))
|
|
gen_config.height = max(sc, int(gen_config.height // sc * sc))
|
|
|
|
is_video = gen_config.num_frames > 1
|
|
if is_video:
|
|
gen_config.num_frames = packing.align_num_frames_down(gen_config.num_frames)
|
|
gen_config.fps = packing.FPS
|
|
gen_config.save_image = partial(new_save_image_function, gen_config)
|
|
gen_config.log_image = partial(blank_log_image_function, gen_config)
|
|
gen_config.output_ext = "mp4"
|
|
|
|
# every ctrl file is a REFERENCE (never a first frame): images are
|
|
# resized to the target's pixel area with their own aspect kept;
|
|
# videos are dataset-style encoded into multi-frame latent blocks
|
|
ref_images = []
|
|
for path in (
|
|
gen_config.ctrl_img,
|
|
gen_config.ctrl_img_1,
|
|
gen_config.ctrl_img_2,
|
|
gen_config.ctrl_img_3,
|
|
):
|
|
if path is None:
|
|
continue
|
|
if os.path.splitext(str(path))[1].lower() in packing_video_exts:
|
|
ref_images.append(
|
|
self._encode_ref_video_for_sampling(str(path), gen_config)
|
|
)
|
|
else:
|
|
img = Image.open(path).convert("RGB")
|
|
if self._image_ref_video_frames():
|
|
ref_images.append(
|
|
self._encode_static_image_ref_for_sampling(img, gen_config)
|
|
)
|
|
else:
|
|
ref_images.append(
|
|
packing.prepare_reference_image(
|
|
img, gen_config.height, gen_config.width
|
|
)
|
|
)
|
|
|
|
with_audio = bool(self.model_config.model_kwargs.get("sample_audio", True))
|
|
|
|
result = pipeline(
|
|
conditional_embeds=conditional_embeds,
|
|
unconditional_embeds=unconditional_embeds,
|
|
height=gen_config.height,
|
|
width=gen_config.width,
|
|
num_frames=gen_config.num_frames,
|
|
num_inference_steps=gen_config.num_inference_steps,
|
|
guidance_scale=gen_config.guidance_scale,
|
|
latents=gen_config.latents,
|
|
generator=generator,
|
|
ref_images=ref_images or None,
|
|
with_audio=with_audio and is_video,
|
|
)
|
|
if is_video:
|
|
return result # dict consumed by new_save_image_function
|
|
return result[0]
|
|
|
|
|
|
class MinimaxH3FastModel(MinimaxH3Model):
|
|
"""FastH3: FastVideo's DMD2-distilled 4-step MiniMax-H3 preview, trained
|
|
with VSA (Video Sparse Attention) at 90% sparsity. Text-to-video(+audio)
|
|
only — no first-frame or reference conditioning.
|
|
|
|
The DiT is the int8-ConvRot repack of
|
|
``FastVideo/FastVideo-Minimax-FastH3-Preview-v0.2`` (built with
|
|
scripts/convert_minimax_h2_fastvideo.py): the pruned comfy layout plus a
|
|
``blocks.N.attn.to_gate_compress`` linear per block. Attention runs the
|
|
trained VSA policy — pooled 64-token (4,4,4) tile top-k block-sparse
|
|
attention with the gated compression branch — via FlexAttention
|
|
(src/vsa.py), in training and sampling alike. Text encoder and VAEs are
|
|
shared with the base model.
|
|
|
|
``model_kwargs``:
|
|
- ``vsa`` (default true): false runs dense attention with the gate
|
|
branch off, matching FastVideo's dense LoRA-preview mode
|
|
- ``vsa_sparsity`` (default 0.9, the checkpoint's trained policy)
|
|
|
|
Sample with 4 steps (the distilled schedule) and guidance_scale 1.
|
|
"""
|
|
|
|
arch = "minimax_h3_vsa"
|
|
# FastH3 samples on its trained ladder: [999, 749, 500, 250] on the
|
|
# shared 1000-step grid, each scheduler applying its own shift
|
|
t1000_sample_ladder = True
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
super().__init__(*args, **kwargs)
|
|
kw = self.model_config.model_kwargs
|
|
self.vsa_sparsity: Optional[float] = None
|
|
if bool(kw.get("vsa", True)):
|
|
self.vsa_sparsity = float(kw.get("vsa_sparsity", 0.9))
|
|
|
|
def _dit_component(self) -> str:
|
|
return "dit_fasth3"
|
|
|
|
def _resolve_comfy_file(self, component: str) -> str:
|
|
if component != "dit_fasth3":
|
|
return super()._resolve_comfy_file(component)
|
|
# local search at the comfy-layout locations first; the hub file sits
|
|
# at the FastH3 repo's root, so the download is done directly here
|
|
name_or_path = self.model_config.name_or_path
|
|
extra_roots = (
|
|
[name_or_path] if name_or_path and os.path.isdir(name_or_path) else []
|
|
)
|
|
rel_path = COMFY_FILES[component]
|
|
found = resolve_comfy_file(
|
|
rel_path,
|
|
repo_id=FASTH3_REPO,
|
|
override_path=self.model_config.model_kwargs.get(f"{component}_path", None),
|
|
extra_roots=extra_roots,
|
|
status_fn=self.print_and_status_update,
|
|
local_only=True,
|
|
)
|
|
if found is not None:
|
|
return found
|
|
import huggingface_hub
|
|
|
|
target_dir = os.path.join(MODELS_PATH, "diffusion_models")
|
|
os.makedirs(target_dir, exist_ok=True)
|
|
self.print_and_status_update(
|
|
f"Downloading {os.path.basename(rel_path)} from {FASTH3_REPO}"
|
|
)
|
|
try:
|
|
return huggingface_hub.hf_hub_download(
|
|
repo_id=FASTH3_REPO,
|
|
filename=os.path.basename(rel_path),
|
|
local_dir=target_dir,
|
|
)
|
|
except Exception as e:
|
|
raise FileNotFoundError(
|
|
f"{os.path.basename(rel_path)} was not found locally or on "
|
|
f"{FASTH3_REPO}. Build it from the FastVideo release with:\n"
|
|
f" python scripts/convert_minimax_h2_fastvideo.py "
|
|
f"{FASTH3_SOURCE_REPO} {os.path.join(target_dir, os.path.basename(rel_path))}\n"
|
|
f"or point model_kwargs.dit_fasth3_path at an existing "
|
|
f"FastH3 int8-convrot file."
|
|
) from e
|
|
|
|
def _load_transformer(self) -> MiniMaxH3Transformer:
|
|
transformer = super()._load_transformer()
|
|
if not transformer.params.gate_compress:
|
|
raise ValueError(
|
|
"minimax_h3_vsa needs a VSA-trained checkpoint with "
|
|
"blocks.N.attn.to_gate_compress weights (FastH3); this file "
|
|
"has none. Use arch minimax_h3 for the base checkpoints."
|
|
)
|
|
transformer.vsa_sparsity = self.vsa_sparsity
|
|
return transformer
|
|
|
|
def _build_condition(
|
|
self, batch: "DataLoaderBatchDTO", latent_shape, device, dtype
|
|
):
|
|
# t2v only: no keyframe or reference conditioning
|
|
return None, None, (), ()
|
|
|
|
def get_base_model_version(self):
|
|
return "minimax_h3_vsa"
|
|
|
|
@property
|
|
def text_embedding_space_version(self):
|
|
# same Qwen3-VL presentation as the base model: share the embed cache
|
|
return "minimax_h3"
|