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[Single File] Fix loading for LTX 0.9.7 transformer #11578

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Merged
merged 1 commit into from
May 19, 2025
Merged

[Single File] Fix loading for LTX 0.9.7 transformer #11578

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6 changes: 5 additions & 1 deletion src/diffusers/loaders/single_file_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -179,6 +179,7 @@
"ltx-video": {"pretrained_model_name_or_path": "diffusers/LTX-Video-0.9.0"},
"ltx-video-0.9.1": {"pretrained_model_name_or_path": "diffusers/LTX-Video-0.9.1"},
"ltx-video-0.9.5": {"pretrained_model_name_or_path": "Lightricks/LTX-Video-0.9.5"},
"ltx-video-0.9.7": {"pretrained_model_name_or_path": "Lightricks/LTX-Video-0.9.7-dev"},
"autoencoder-dc-f128c512": {"pretrained_model_name_or_path": "mit-han-lab/dc-ae-f128c512-mix-1.0-diffusers"},
"autoencoder-dc-f64c128": {"pretrained_model_name_or_path": "mit-han-lab/dc-ae-f64c128-mix-1.0-diffusers"},
"autoencoder-dc-f32c32": {"pretrained_model_name_or_path": "mit-han-lab/dc-ae-f32c32-mix-1.0-diffusers"},
Expand Down Expand Up @@ -644,7 +645,10 @@ def infer_diffusers_model_type(checkpoint):
model_type = "flux-schnell"

elif any(key in checkpoint for key in CHECKPOINT_KEY_NAMES["ltx-video"]):
if checkpoint["vae.encoder.conv_out.conv.weight"].shape[1] == 2048:
has_vae = "vae.encoder.conv_in.conv.bias" in checkpoint
if any(key.endswith("transformer_blocks.47.scale_shift_table") for key in checkpoint):
model_type = "ltx-video-0.9.7"
elif has_vae and checkpoint["vae.encoder.conv_out.conv.weight"].shape[1] == 2048:
model_type = "ltx-video-0.9.5"
elif "vae.decoder.last_time_embedder.timestep_embedder.linear_1.weight" in checkpoint:
model_type = "ltx-video-0.9.1"
Expand Down