Fix wan issues when prompt length is long.

Author: comfyanonymous

comfy/ldm/wan/model.py

@@ -421,7 +421,7 @@ def forward_orig(
         e0 = self.time_projection(e).unflatten(1, (6, self.dim))
 
         # context
-        context = self.text_embedding(torch.cat([context, context.new_zeros(context.size(0), self.text_len - context.size(1), context.size(2))], dim=1))
+        context = self.text_embedding(context)
 
         if clip_fea is not None and self.img_emb is not None:
             context_clip = self.img_emb(clip_fea)  # bs x 257 x dim

comfy/text_encoders/wan.py

@@ -11,7 +11,7 @@ def __init__(self, device="cpu", layer="last", layer_idx=None, dtype=None, model
 class UMT5XXlTokenizer(sd1_clip.SDTokenizer):
     def __init__(self, embedding_directory=None, tokenizer_data={}):
         tokenizer = tokenizer_data.get("spiece_model", None)
-        super().__init__(tokenizer, pad_with_end=False, embedding_size=4096, embedding_key='umt5xxl', tokenizer_class=SPieceTokenizer, has_start_token=False, pad_to_max_length=False, max_length=99999999, min_length=1, pad_token=0)
+        super().__init__(tokenizer, pad_with_end=False, embedding_size=4096, embedding_key='umt5xxl', tokenizer_class=SPieceTokenizer, has_start_token=False, pad_to_max_length=False, max_length=99999999, min_length=512, pad_token=0)
 
     def state_dict(self):
         return {"spiece_model": self.tokenizer.serialize_model()}