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Merged
merged 5 commits into from
Jun 13, 2025
Merged

Support Wan AccVideo lora #11704

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dc6f8f5
update
a-r-r-o-w Jun 12, 2025
d4b7f98
make style
a-r-r-o-w Jun 12, 2025
88136f5
Update src/diffusers/loaders/lora_conversion_utils.py
a-r-r-o-w Jun 12, 2025
1e66d3d
add note explaining threshold
a-r-r-o-w Jun 13, 2025
905e467
Merge branch 'main' into support-wan-accvideo-lora
a-r-r-o-w Jun 13, 2025
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59 changes: 45 additions & 14 deletions src/diffusers/loaders/lora_conversion_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1605,9 +1605,18 @@ def _convert_non_diffusers_wan_lora_to_diffusers(state_dict):
if diff_keys:
for diff_k in diff_keys:
param = original_state_dict[diff_k]
# The magnitudes of the .diff-ending weights are very low (most are below 1e-4, some are upto 1e-3,
# and 2 of them are about 1.6e-2 [the case with AccVideo lora]). The low magnitudes mostly correspond
# to norm layers. Ignoring them is the best option at the moment until a better solution is found. It
# is okay to ignore because they do not affect the model output in a significant manner.
threshold = 1.6e-2
absdiff = param.abs().max() - param.abs().min()
all_zero = torch.all(param == 0).item()
if all_zero:
logger.debug(f"Removed {diff_k} key from the state dict as it's all zeros.")
all_absdiff_lower_than_threshold = absdiff < threshold
if all_zero or all_absdiff_lower_than_threshold:
logger.debug(
f"Removed {diff_k} key from the state dict as it's all zeros, or values lower than hardcoded threshold."
)
original_state_dict.pop(diff_k)

# For the `diff_b` keys, we treat them as lora_bias.
Expand Down Expand Up @@ -1655,12 +1664,16 @@ def _convert_non_diffusers_wan_lora_to_diffusers(state_dict):

# FFN
for o, c in zip(["ffn.0", "ffn.2"], ["net.0.proj", "net.2"]):
converted_state_dict[f"blocks.{i}.ffn.{c}.lora_A.weight"] = original_state_dict.pop(
f"blocks.{i}.{o}.{lora_down_key}.weight"
)
converted_state_dict[f"blocks.{i}.ffn.{c}.lora_B.weight"] = original_state_dict.pop(
f"blocks.{i}.{o}.{lora_up_key}.weight"
)
original_key = f"blocks.{i}.{o}.{lora_down_key}.weight"
converted_key = f"blocks.{i}.ffn.{c}.lora_A.weight"
if original_key in original_state_dict:
converted_state_dict[converted_key] = original_state_dict.pop(original_key)

original_key = f"blocks.{i}.{o}.{lora_up_key}.weight"
converted_key = f"blocks.{i}.ffn.{c}.lora_B.weight"
if original_key in original_state_dict:
converted_state_dict[converted_key] = original_state_dict.pop(original_key)

if f"blocks.{i}.{o}.diff_b" in original_state_dict:
converted_state_dict[f"blocks.{i}.ffn.{c}.lora_B.bias"] = original_state_dict.pop(
f"blocks.{i}.{o}.diff_b"
Expand All @@ -1669,12 +1682,16 @@ def _convert_non_diffusers_wan_lora_to_diffusers(state_dict):
# Remaining.
if original_state_dict:
if any("time_projection" in k for k in original_state_dict):
converted_state_dict["condition_embedder.time_proj.lora_A.weight"] = original_state_dict.pop(
f"time_projection.1.{lora_down_key}.weight"
)
converted_state_dict["condition_embedder.time_proj.lora_B.weight"] = original_state_dict.pop(
f"time_projection.1.{lora_up_key}.weight"
)
original_key = f"time_projection.1.{lora_down_key}.weight"
converted_key = "condition_embedder.time_proj.lora_A.weight"
if original_key in original_state_dict:
converted_state_dict[converted_key] = original_state_dict.pop(original_key)

original_key = f"time_projection.1.{lora_up_key}.weight"
converted_key = "condition_embedder.time_proj.lora_B.weight"
if original_key in original_state_dict:
converted_state_dict[converted_key] = original_state_dict.pop(original_key)

if "time_projection.1.diff_b" in original_state_dict:
converted_state_dict["condition_embedder.time_proj.lora_B.bias"] = original_state_dict.pop(
"time_projection.1.diff_b"
Expand Down Expand Up @@ -1709,6 +1726,20 @@ def _convert_non_diffusers_wan_lora_to_diffusers(state_dict):
original_state_dict.pop(f"{text_time}.{b_n}.diff_b")
)

for img_ours, img_theirs in [
("ff.net.0.proj", "img_emb.proj.1"),
("ff.net.2", "img_emb.proj.3"),
]:
original_key = f"{img_theirs}.{lora_down_key}.weight"
converted_key = f"condition_embedder.image_embedder.{img_ours}.lora_A.weight"
if original_key in original_state_dict:
converted_state_dict[converted_key] = original_state_dict.pop(original_key)

original_key = f"{img_theirs}.{lora_up_key}.weight"
converted_key = f"condition_embedder.image_embedder.{img_ours}.lora_B.weight"
if original_key in original_state_dict:
converted_state_dict[converted_key] = original_state_dict.pop(original_key)

if len(original_state_dict) > 0:
diff = all(".diff" in k for k in original_state_dict)
if diff:
Expand Down