Fix issue with ltx caching

testing/test_model_loading.py

@@ -21,6 +21,7 @@ import argparse
 import glob
 import json
 import os
+import shutil
 import subprocess
 import sys
 import time
@@ -235,6 +236,9 @@ def run_one(
         out_dir = os.path.join(out_dir, f"qtype_{qtype_override}")
     os.makedirs(out_dir, exist_ok=True)
     for old in glob.glob(os.path.join(out_dir, "*")):
+        if os.path.isdir(old):
+            shutil.rmtree(old)
+        else:
             os.remove(old)
 
     from toolkit.config_modules import GenerateImageConfig, ModelConfig

toolkit/memory_management/manager.py

@@ -55,6 +55,26 @@ class MemoryManager:
         self.unmanaged_modules: list[torch.nn.Module] = []
 
     def memory_managed_to(self, *args, **kwargs):
+        # the manager owns placement: the resident (unmanaged/ignore) set must
+        # live on the compute device for forwards to work. Legacy parking
+        # gestures (.to("cpu") between phases) would strand it there — the
+        # swapped .device property keeps reporting the compute device, so no
+        # holder heal ever brings it back. Honor device moves only TO the
+        # compute device; skip the device part of anything else (dtype
+        # handling below is unaffected).
+        target_device = kwargs.get("device", None)
+        for arg in args:
+            if isinstance(arg, (torch.device, str)) and not isinstance(arg, torch.dtype):
+                try:
+                    target_device = torch.device(arg)
+                except (TypeError, RuntimeError):
+                    pass
+            elif isinstance(arg, torch.device):
+                target_device = arg
+        move_resident = target_device is not None and (
+            torch.device(target_device) == torch.device(self.process_device)
+        )
+        if target_device is None or move_resident:
             # first move all the unmanaged modules
             for module in self.unmanaged_modules:
                 if isinstance(module, torch.Tensor):

toolkit/models/v2/text_encoders/gemma3.py

@@ -14,8 +14,10 @@ class Gemma3TextEncoder(Gemma3ForConditionalGeneration, OstrisTransformersMixin)
         # both layouts seen across transformers versions; missing paths skip
         return ["model.language_model.layers", "language_model.model.layers"]
 
-    def get_offload_ignore_modules(self):
+    # embed_tokens is NOT an ignore module: the manager's bouncing embedding
-        return [self.model.language_model.base_model.embed_tokens]
+    # keeps it cpu-resident with a cpu-side row gather (an ignore pin kept
+    # 2GB on the gpu and stranded it when legacy .to("cpu") gestures moved
+    # the resident set off-device)
 
 
 try:
@@ -33,10 +35,9 @@ try:
 
         def get_offload_ignore_modules(self):
             # layer_scalar is a bare tensor buffer on each decoder layer; the
-            # manager never enumerates it, so it must ride along explicitly
+            # manager never enumerates it, so it must ride along explicitly.
-            return [self.embed_tokens] + [
+            # (embed_tokens is handled by the bouncing embedding manager.)
-                layer.layer_scalar for layer in self.layers
+            return [layer.layer_scalar for layer in self.layers]
-            ]
 
 except ImportError:
     Gemma4TextEncoder = None

toolkit/util/mixed_precision.py

@@ -76,9 +76,23 @@ def pin_stored_fp32(root: nn.Module):
         if probe.dtype == torch.float32:
             return orig_apply(fn, *args, **kwargs)
 
+        # where fn sends a tensor depends on where it already is: a dtype-only
+        # cast keeps a cuda tensor on cuda (probing from cpu would wrongly
+        # report cpu and drag pinned tables off the gpu); an explicit device
+        # move relocates it. Probe per source device.
+        target_by_device = {}
+
+        def _target_device(dev):
+            if dev not in target_by_device:
+                target_by_device[dev] = fn(
+                    torch.zeros((), dtype=torch.float32, device=dev)
+                ).device
+            return target_by_device[dev]
+
         def fn_pinned(t):
             if getattr(t, "_pin_dtype", False):
-                out = t if t.device == probe.device else t.to(probe.device)
+                target = _target_device(t.device)
+                out = t if t.device == target else t.to(target)
                 out._pin_dtype = True
                 return out
             return fn(t)