Update pipeline_aura_flow.py

Author: hlky

src/diffusers/pipelines/aura_flow/pipeline_aura_flow.py

@@ -17,6 +17,7 @@
 import torch
 from transformers import T5Tokenizer, UMT5EncoderModel
 
+from ...callbacks import MultiPipelineCallbacks, PipelineCallback
 from ...image_processor import VaeImageProcessor
 from ...models import AuraFlowTransformer2DModel, AutoencoderKL
 from ...models.attention_processor import AttnProcessor2_0, FusedAttnProcessor2_0, XFormersAttnProcessor