[Sana 4K] Add vae tiling option to avoid OOM (#10583)

Co-authored-by: J石页 <jiangshuo9@h-partners.com>

examples/dreambooth/train_dreambooth_lora_sana.py

@@ -158,6 +158,9 @@ def log_validation(
         f"Running validation... \n Generating {args.num_validation_images} images with prompt:"
         f" {args.validation_prompt}."
     )
+    if args.enable_vae_tiling:
+        pipeline.vae.enable_tiling(tile_sample_min_height=1024, tile_sample_stride_width=1024)
+
     pipeline.text_encoder = pipeline.text_encoder.to(torch.bfloat16)
     pipeline = pipeline.to(accelerator.device)
     pipeline.set_progress_bar_config(disable=True)
@@ -597,6 +600,7 @@ def parse_args(input_args=None):
         help="Whether to offload the VAE and the text encoder to CPU when they are not used.",
     )
     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")
 
     if input_args is not None:
         args = parser.parse_args(input_args)