Reduce Memory Cost in Flux Training (huggingface#9829)

* Improve NPU performance

* Improve NPU performance

* Improve NPU performance

* Improve NPU performance

* [bugfix] bugfix for npu free memory

* [bugfix] bugfix for npu free memory

* [bugfix] bugfix for npu free memory

* Reduce memory cost for flux training process

---------

Co-authored-by: 蒋硕 <[email protected]>
Co-authored-by: Sayak Paul <[email protected]>

Author: 3 people

examples/dreambooth/train_dreambooth_flux.py

@@ -1740,6 +1740,9 @@ def get_sigmas(timesteps, n_dim=4, dtype=torch.float32):
                         torch_npu.npu.empty_cache()
                     gc.collect()
 
+                images = None
+                del pipeline
+
     # Save the lora layers
     accelerator.wait_for_everyone()
     if accelerator.is_main_process:
@@ -1798,6 +1801,9 @@ def get_sigmas(timesteps, n_dim=4, dtype=torch.float32):
                 ignore_patterns=["step_*", "epoch_*"],
             )
 
+        images = None
+        del pipeline
+
     accelerator.end_training()
 
 

examples/dreambooth/train_dreambooth_lora_flux.py

@@ -1844,6 +1844,9 @@ def get_sigmas(timesteps, n_dim=4, dtype=torch.float32):
                     del text_encoder_one, text_encoder_two
                     free_memory()
 
+                images = None
+                del pipeline
+
     # Save the lora layers
     accelerator.wait_for_everyone()
     if accelerator.is_main_process:
@@ -1908,6 +1911,9 @@ def get_sigmas(timesteps, n_dim=4, dtype=torch.float32):
                 ignore_patterns=["step_*", "epoch_*"],
             )
 
+        images = None
+        del pipeline
+
     accelerator.end_training()