add attentionmixin to qwen image (#12219)

Author: sayakpaul

src/diffusers/models/transformers/transformer_qwenimage.py

@@ -25,7 +25,7 @@
 from ...loaders import FromOriginalModelMixin, PeftAdapterMixin
 from ...utils import USE_PEFT_BACKEND, logging, scale_lora_layers, unscale_lora_layers
 from ...utils.torch_utils import maybe_allow_in_graph
-from ..attention import FeedForward
+from ..attention import AttentionMixin, FeedForward
 from ..attention_dispatch import dispatch_attention_fn
 from ..attention_processor import Attention
 from ..cache_utils import CacheMixin
@@ -470,7 +470,9 @@ def forward(
         return encoder_hidden_states, hidden_states
 
 
-class QwenImageTransformer2DModel(ModelMixin, ConfigMixin, PeftAdapterMixin, FromOriginalModelMixin, CacheMixin):
+class QwenImageTransformer2DModel(
+    ModelMixin, ConfigMixin, PeftAdapterMixin, FromOriginalModelMixin, CacheMixin, AttentionMixin
+):
     """
     The Transformer model introduced in Qwen.