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2 changes: 2 additions & 0 deletions src/diffusers/models/unet_2d.py
Original file line number Diff line number Diff line change
Expand Up @@ -291,6 +291,8 @@ def forward(

class_emb = self.class_embedding(class_labels).to(dtype=self.dtype)
emb = emb + class_emb
elif self.class_embedding is None and class_labels is not None:
raise ValueError("class_embedding needs to be initialized in order to use class conditioning")

# 2. pre-process
skip_sample = sample
Expand Down