import torch, os, json from diffsynth import load_state_dict from diffsynth.pipelines.flux_image_new import FluxImagePipeline, ModelConfig, ControlNetInput from diffsynth.trainers.utils import DiffusionTrainingModule, ImageDataset, ModelLogger, launch_training_task, flux_parser from diffsynth.models.lora import FluxLoRAConverter os.environ["TOKENIZERS_PARALLELISM"] = "false" class FluxTrainingModule(DiffusionTrainingModule): def __init__( self, model_paths=None, model_id_with_origin_paths=None, trainable_models=None, lora_base_model=None, lora_target_modules="a_to_qkv,b_to_qkv,ff_a.0,ff_a.2,ff_b.0,ff_b.2,a_to_out,b_to_out,proj_out,norm.linear,norm1_a.linear,norm1_b.linear,to_qkv_mlp", lora_rank=32, lora_checkpoint=None, use_gradient_checkpointing=True, use_gradient_checkpointing_offload=False, extra_inputs=None, ): super().__init__() # Load models model_configs = [] if model_paths is not None: model_paths = json.loads(model_paths) model_configs += [ModelConfig(path=path) 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]) for i in model_id_with_origin_paths] self.pipe = FluxImagePipeline.from_pretrained(torch_dtype=torch.bfloat16, device="cpu", model_configs=model_configs) # Reset training scheduler self.pipe.scheduler.set_timesteps(1000, training=True) # Freeze untrainable models self.pipe.freeze_except([] if trainable_models is None else trainable_models.split(",")) # Add LoRA to the base models if lora_base_model is not None: model = self.add_lora_to_model( getattr(self.pipe, lora_base_model), target_modules=lora_target_modules.split(","), lora_rank=lora_rank ) 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(self.pipe, lora_base_model, model) # Store other configs self.use_gradient_checkpointing = use_gradient_checkpointing self.use_gradient_checkpointing_offload = use_gradient_checkpointing_offload self.extra_inputs = extra_inputs.split(",") if extra_inputs is not None else [] def forward_preprocess(self, data): # CFG-sensitive parameters inputs_posi = {"prompt": data["prompt"]} inputs_nega = {"negative_prompt": ""} # CFG-unsensitive parameters inputs_shared = { # Assume you are using this pipeline for inference, # please fill in the input parameters. "input_image": data["image"], "height": data["image"].size[1], "width": data["image"].size[0], # Please do not modify the following parameters # unless you clearly know what this will cause. "cfg_scale": 1, "embedded_guidance": 1, "t5_sequence_length": 512, "tiled": False, "rand_device": self.pipe.device, "use_gradient_checkpointing": self.use_gradient_checkpointing, "use_gradient_checkpointing_offload": self.use_gradient_checkpointing_offload, } # Extra inputs controlnet_input = {} for extra_input in self.extra_inputs: if extra_input.startswith("controlnet_"): controlnet_input[extra_input.replace("controlnet_", "")] = data[extra_input] else: inputs_shared[extra_input] = data[extra_input] if len(controlnet_input) > 0: inputs_shared["controlnet_inputs"] = [ControlNetInput(**controlnet_input)] # Pipeline units will automatically process the input parameters. for unit in self.pipe.units: inputs_shared, inputs_posi, inputs_nega = self.pipe.unit_runner(unit, self.pipe, inputs_shared, inputs_posi, inputs_nega) return {**inputs_shared, **inputs_posi} def forward(self, data, inputs=None): if inputs is None: inputs = self.forward_preprocess(data) models = {name: getattr(self.pipe, name) for name in self.pipe.in_iteration_models} loss = self.pipe.training_loss(**models, **inputs) return loss if __name__ == "__main__": parser = flux_parser() args = parser.parse_args() dataset = ImageDataset(args=args) model = FluxTrainingModule( model_paths=args.model_paths, model_id_with_origin_paths=args.model_id_with_origin_paths, trainable_models=args.trainable_models, lora_base_model=args.lora_base_model, lora_target_modules=args.lora_target_modules, lora_rank=args.lora_rank, lora_checkpoint=args.lora_checkpoint, use_gradient_checkpointing=args.use_gradient_checkpointing, use_gradient_checkpointing_offload=args.use_gradient_checkpointing_offload, extra_inputs=args.extra_inputs, ) model_logger = ModelLogger( args.output_path, remove_prefix_in_ckpt=args.remove_prefix_in_ckpt, state_dict_converter=FluxLoRAConverter.align_to_opensource_format if args.align_to_opensource_format else lambda x:x, ) optimizer = torch.optim.AdamW(model.trainable_modules(), lr=args.learning_rate, weight_decay=args.weight_decay) scheduler = torch.optim.lr_scheduler.ConstantLR(optimizer) launch_training_task( dataset, model, model_logger, optimizer, scheduler, num_epochs=args.num_epochs, gradient_accumulation_steps=args.gradient_accumulation_steps, save_steps=args.save_steps, find_unused_parameters=args.find_unused_parameters, num_workers=args.dataset_num_workers, )