move training code to base trainer

diffsynth/trainers/utils.py

@@ -1,4 +1,6 @@
 import imageio, os, torch, warnings, torchvision, argparse, json
+from ..utils import ModelConfig
+from ..models.utils import load_state_dict
 from peft import LoraConfig, inject_adapter_in_model
 from PIL import Image
 import pandas as pd
@@ -424,7 +426,53 @@ class DiffusionTrainingModule(torch.nn.Module):
             if isinstance(data[key], torch.Tensor):
                 data[key] = data[key].to(device)
         return data
-
+    
+    
+    def parse_model_configs(self, model_paths, model_id_with_origin_paths, enable_fp8_training=False):
+        offload_dtype = torch.float8_e4m3fn if enable_fp8_training else None
+        model_configs = []
+        if model_paths is not None:
+            model_paths = json.loads(model_paths)
+            model_configs += [ModelConfig(path=path, offload_dtype=offload_dtype) for path in model_paths]
+        if model_id_with_origin_paths is not None:
+            model_id_with_origin_paths = model_id_with_origin_paths.split(",")
+            model_configs += [ModelConfig(model_id=i.split(":")[0], origin_file_pattern=i.split(":")[1], offload_dtype=offload_dtype) for i in model_id_with_origin_paths]
+        return model_configs
+    
+    
+    def switch_pipe_to_training_mode(
+        self,
+        pipe,
+        trainable_models,
+        lora_base_model, lora_target_modules, lora_rank, lora_checkpoint=None,
+        enable_fp8_training=False,
+    ):
+        # Scheduler
+        pipe.scheduler.set_timesteps(1000, training=True)
+        
+        # Freeze untrainable models
+        pipe.freeze_except([] if trainable_models is None else trainable_models.split(","))
+        
+        # Enable FP8 if pipeline supports
+        if enable_fp8_training and hasattr(pipe, "_enable_fp8_lora_training"):
+            pipe._enable_fp8_lora_training(torch.float8_e4m3fn)
+        
+        # Add LoRA to the base models
+        if lora_base_model is not None:
+            model = self.add_lora_to_model(
+                getattr(pipe, lora_base_model),
+                target_modules=lora_target_modules.split(","),
+                lora_rank=lora_rank,
+                upcast_dtype=pipe.torch_dtype,
+            )
+            if lora_checkpoint is not None:
+                state_dict = load_state_dict(lora_checkpoint)
+                state_dict = self.mapping_lora_state_dict(state_dict)
+                load_result = model.load_state_dict(state_dict, strict=False)
+                print(f"LoRA checkpoint loaded: {lora_checkpoint}, total {len(state_dict)} keys")
+                if len(load_result[1]) > 0:
+                    print(f"Warning, LoRA key mismatch! Unexpected keys in LoRA checkpoint: {load_result[1]}")
+            setattr(pipe, lora_base_model, model)
 
 
 class ModelLogger: