Fix LTX 0.9.5 single file (#11271)

src/diffusers/loaders/single_file_utils.py

@@ -177,6 +177,7 @@ DIFFUSERS_DEFAULT_PIPELINE_PATHS = {
     "flux-schnell": {"pretrained_model_name_or_path": "black-forest-labs/FLUX.1-schnell"},
     "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"},
     "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"},
@@ -638,7 +639,9 @@ def infer_diffusers_model_type(checkpoint):
             model_type = "flux-schnell"
 
     elif any(key in checkpoint for key in CHECKPOINT_KEY_NAMES["ltx-video"]):
-        if "vae.decoder.last_time_embedder.timestep_embedder.linear_1.weight" in checkpoint:
+        if 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"
         else:
             model_type = "ltx-video"
@@ -2403,13 +2406,41 @@ def convert_ltx_vae_checkpoint_to_diffusers(checkpoint, **kwargs):
         "last_scale_shift_table": "scale_shift_table",
     }
 
+    VAE_095_RENAME_DICT = {
+        # decoder
+        "up_blocks.0": "mid_block",
+        "up_blocks.1": "up_blocks.0.upsamplers.0",
+        "up_blocks.2": "up_blocks.0",
+        "up_blocks.3": "up_blocks.1.upsamplers.0",
+        "up_blocks.4": "up_blocks.1",
+        "up_blocks.5": "up_blocks.2.upsamplers.0",
+        "up_blocks.6": "up_blocks.2",
+        "up_blocks.7": "up_blocks.3.upsamplers.0",
+        "up_blocks.8": "up_blocks.3",
+        # encoder
+        "down_blocks.0": "down_blocks.0",
+        "down_blocks.1": "down_blocks.0.downsamplers.0",
+        "down_blocks.2": "down_blocks.1",
+        "down_blocks.3": "down_blocks.1.downsamplers.0",
+        "down_blocks.4": "down_blocks.2",
+        "down_blocks.5": "down_blocks.2.downsamplers.0",
+        "down_blocks.6": "down_blocks.3",
+        "down_blocks.7": "down_blocks.3.downsamplers.0",
+        "down_blocks.8": "mid_block",
+        # common
+        "last_time_embedder": "time_embedder",
+        "last_scale_shift_table": "scale_shift_table",
+    }
+
     VAE_SPECIAL_KEYS_REMAP = {
         "per_channel_statistics.channel": remove_keys_,
         "per_channel_statistics.mean-of-means": remove_keys_,
         "per_channel_statistics.mean-of-stds": remove_keys_,
     }
 
-    if "vae.decoder.last_time_embedder.timestep_embedder.linear_1.weight" in converted_state_dict:
+    if converted_state_dict["vae.encoder.conv_out.conv.weight"].shape[1] == 2048:
+        VAE_KEYS_RENAME_DICT.update(VAE_095_RENAME_DICT)
+    elif "vae.decoder.last_time_embedder.timestep_embedder.linear_1.weight" in converted_state_dict:
         VAE_KEYS_RENAME_DICT.update(VAE_091_RENAME_DICT)
 
     for key in list(converted_state_dict.keys()):