NPU Adaption for Sanna (#10409)

* NPU Adaption for Sanna


---------
Co-authored-by: J石页 <jiangshuo9@h-partners.com>
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>

examples/dreambooth/train_dreambooth_lora_sana.py

@@ -63,6 +63,7 @@ from diffusers.utils import (
     is_wandb_available,
 )
 from diffusers.utils.hub_utils import load_or_create_model_card, populate_model_card
+from diffusers.utils.import_utils import is_torch_npu_available
 from diffusers.utils.torch_utils import is_compiled_module
 
 
@@ -74,6 +75,9 @@ check_min_version("0.33.0.dev0")
 
 logger = get_logger(__name__)
 
+if is_torch_npu_available():
+    torch.npu.config.allow_internal_format = False
+
 
 def save_model_card(
     repo_id: str,
@@ -601,6 +605,7 @@ def parse_args(input_args=None):
     )
     parser.add_argument("--local_rank", type=int, default=-1, help="For distributed training: local_rank")
     parser.add_argument("--enable_vae_tiling", action="store_true", help="Enabla vae tiling in log validation")
+    parser.add_argument("--enable_npu_flash_attention", action="store_true", help="Enabla Flash Attention for NPU")
 
     if input_args is not None:
         args = parser.parse_args(input_args)
@@ -924,8 +929,7 @@ def main(args):
                     image.save(image_filename)
 
             del pipeline
-            if torch.cuda.is_available():
-                torch.cuda.empty_cache()
+            free_memory()
 
     # Handle the repository creation
     if accelerator.is_main_process:
@@ -988,6 +992,13 @@ def main(args):
     # because Gemma2 is particularly suited for bfloat16.
     text_encoder.to(dtype=torch.bfloat16)
 
+    if args.enable_npu_flash_attention:
+        if is_torch_npu_available():
+            logger.info("npu flash attention enabled.")
+            transformer.enable_npu_flash_attention()
+        else:
+            raise ValueError("npu flash attention requires torch_npu extensions and is supported only on npu device ")
+
     # Initialize a text encoding pipeline and keep it to CPU for now.
     text_encoding_pipeline = SanaPipeline.from_pretrained(
         args.pretrained_model_name_or_path,

src/diffusers/models/attention_processor.py

@@ -3154,6 +3154,11 @@ class AttnProcessorNPU:
             # scaled_dot_product_attention expects attention_mask shape to be
             # (batch, heads, source_length, target_length)
             attention_mask = attention_mask.view(batch_size, attn.heads, -1, attention_mask.shape[-1])
+            attention_mask = attention_mask.repeat(1, 1, hidden_states.shape[1], 1)
+            if attention_mask.dtype == torch.bool:
+                attention_mask = torch.logical_not(attention_mask.bool())
+            else:
+                attention_mask = attention_mask.bool()
 
         if attn.group_norm is not None:
             hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose(1, 2)