Allow from_transformer in SD3ControlNetModel (#8749)

* Update controlnet_sd3.py

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Co-authored-by: YiYi Xu <yixu310@gmail.com>

src/diffusers/models/controlnet_sd3.py

@@ -239,16 +239,16 @@ class SD3ControlNetModel(ModelMixin, ConfigMixin, PeftAdapterMixin, FromOriginal
             module.gradient_checkpointing = value
 
     @classmethod
-    def from_transformer(cls, transformer, num_layers=None, load_weights_from_transformer=True):
+    def from_transformer(cls, transformer, num_layers=12, load_weights_from_transformer=True):
         config = transformer.config
         config["num_layers"] = num_layers or config.num_layers
         controlnet = cls(**config)
 
         if load_weights_from_transformer:
-            controlnet.pos_embed.load_state_dict(transformer.pos_embed.state_dict(), strict=False)
-            controlnet.time_text_embed.load_state_dict(transformer.time_text_embed.state_dict(), strict=False)
-            controlnet.context_embedder.load_state_dict(transformer.context_embedder.state_dict(), strict=False)
-            controlnet.transformer_blocks.load_state_dict(transformer.transformer_blocks.state_dict())
+            controlnet.pos_embed.load_state_dict(transformer.pos_embed.state_dict())
+            controlnet.time_text_embed.load_state_dict(transformer.time_text_embed.state_dict())
+            controlnet.context_embedder.load_state_dict(transformer.context_embedder.state_dict())
+            controlnet.transformer_blocks.load_state_dict(transformer.transformer_blocks.state_dict(), strict=False)
 
             controlnet.pos_embed_input = zero_module(controlnet.pos_embed_input)