[UnCLIPPipeline] fix num_images_per_prompt (huggingface#1762)

duplicate maks for num_images_per_prompt

Author: patil-suraj

src/diffusers/pipelines/unclip/pipeline_unclip.py

@@ -143,6 +143,7 @@ def _encode_prompt(self, prompt, num_images_per_prompt, do_classifier_free_guida
 
         text_embeddings = text_embeddings.repeat_interleave(num_images_per_prompt, dim=0)
         text_encoder_hidden_states = text_encoder_hidden_states.repeat_interleave(num_images_per_prompt, dim=0)
+        text_mask = text_mask.repeat_interleave(num_images_per_prompt, dim=0)
 
         if do_classifier_free_guidance:
             uncond_tokens = [""] * batch_size
@@ -172,6 +173,7 @@ def _encode_prompt(self, prompt, num_images_per_prompt, do_classifier_free_guida
             uncond_text_encoder_hidden_states = uncond_text_encoder_hidden_states.view(
                 batch_size * num_images_per_prompt, seq_len, -1
             )
+            uncond_text_mask = uncond_text_mask.repeat(1, num_images_per_prompt)
 
             # done duplicates