[Train] Support qwen dmd-lora training

lightx2v_train/configs/dmd_lora/qwen_image_dmd_lora.yaml

@@ -0,0 +1,107 @@
+model:
+    name: qwen_image
+    pretrained_model_name_or_path: /path/to/Qwen/Qwen-Image
+    max_sequence_length: 1024
+    running_dtype: bf16
+
+data:
+    train:
+        name: image_dataset
+        num_workers: 8
+        prompt_dropout_rate: 0.0
+        target_area: 1048576 # 1024 * 1024
+        shuffle: true
+        data_path:
+            - /path/to/LightX2V_train_data_examples/dataset_v1/train.jsonl
+    val:
+        name: image_dataset
+        num_workers: 8
+        shuffle: false
+        data_path:
+            - /path/to/LightX2V_train_data_examples/dataset_v1/val.jsonl
+
+scheduler:
+    num_train_timesteps: 1000
+    time_shift_settings:
+        do_time_shift: true
+        shift_type: linear
+        # shift function: "linear" => mu/(mu+(1/t-1)^p), "exponential" => exp(mu)/(exp(mu)+(1/t-1)^p)
+        time_shift_power: 1.0
+        dynamic_shift: false
+        time_shift_mu: 3.0
+
+training:
+    method: dmd_lora
+    max_train_iters: 1000
+    gradient_accumulation_iters: 1
+    gradient_checkpointing: true
+    max_grad_norm: 1.0
+    lr_scheduler: constant
+    lr_warmup_iters: 10
+    save_every_iters: 100
+    save_total_limit: 10
+    dmd:
+        num_inference_steps: 4
+        fake_update_ratio: 2
+        image_sizes:
+            - [1024, 1024]
+            - [768, 1344]
+            - [1344, 768]
+        renoise_sigma_min: 0.02
+        renoise_sigma_max: 1.0
+        renoise_discrete_samples: 1000
+        renoise_shift: 5.0
+    lora:
+        rank: 32
+        alpha: 32
+        target_modules:
+            - to_k
+            - to_q
+            - to_v
+            - to_out.0
+            # - add_q_proj
+            # - add_k_proj
+            # - add_v_proj
+            # - to_add_out
+            # - img_mlp.net.0.proj
+            # - img_mlp.net.2
+            # - txt_mlp.net.0.proj
+            # - txt_mlp.net.2
+    student:
+        optimizer:
+            learning_rate: 0.0001
+            adam_beta1: 0.9
+            adam_beta2: 0.999
+            weight_decay: 0.001
+            adam_epsilon: 0.00000001
+    fake:
+        optimizer:
+            learning_rate: 0.00002
+            adam_beta1: 0.9
+            adam_beta2: 0.999
+            weight_decay: 0.001
+            adam_epsilon: 0.00000001
+    teacher:
+        guidance_scale: 4.0
+        negative_prompt: " "
+        cfg_norm: layer_norm
+    output_dir: ./output_train/qwen_image_dmd_lora
+
+inference:
+    method: image_infer
+    default_width: 1024
+    default_height: 1024
+    num_inference_steps: 4
+    cfg_guidance_scale: 4.0
+    negative_prompt: " "
+    enable_cfg: false
+    output_dir: ./output_infer/qwen_image_dmd_lora
+    infer_every_iters: ${training.save_every_iters}
+
+logging:
+    rank_zero_only: true
+    train_log_every_iters: 10
+    infer_log_every_steps: 10
+
+resume:
+    auto_resume: true

lightx2v_train/lightx2v_train/model_zoo/qwen_image.py

@@ -26,7 +26,15 @@ class QwenImageModel(BaseModel):
 
     pipeline_cls = QwenImagePipeline
 
-    def load_components(self):
+    def load_components(self, transformer_only=False, reference_model=None):
+        if transformer_only:
+            if reference_model is not None:
+                self.text_pipeline = reference_model.text_pipeline
+                self.vae = reference_model.vae
+                self.vae_scale_factor = reference_model.vae_scale_factor
+                self.image_processor = reference_model.image_processor
+            self.transformer = self.load_transformer()
+            return
         model_path = self.config["model"]["pretrained_model_name_or_path"]
         self.text_pipeline = QwenImagePipeline.from_pretrained(
             model_path,
@@ -35,13 +43,17 @@ def load_components(self):
             torch_dtype=self.running_dtype,
         ).to(self.device)
         self.vae = AutoencoderKLQwenImage.from_pretrained(model_path, subfolder="vae").to(self.device, dtype=self.running_dtype)
-        self.transformer = QwenImageTransformer2DModel.from_pretrained(model_path, subfolder="transformer").to(self.device, dtype=self.running_dtype)
+        self.transformer = self.load_transformer()
 
         self.text_pipeline.text_encoder.requires_grad_(False)
         self.vae.requires_grad_(False)
         self.vae_scale_factor = 2 ** len(self.vae.temperal_downsample)
         self.image_processor = VaeImageProcessor(vae_scale_factor=self.vae_scale_factor * 2)
 
+    def load_transformer(self):
+        model_path = self.config["model"]["pretrained_model_name_or_path"]
+        return QwenImageTransformer2DModel.from_pretrained(model_path, subfolder="transformer").to(self.device, dtype=self.running_dtype)
+
     def denoiser_module(self):
         return self.transformer
 
@@ -69,6 +81,9 @@ def encode_to_latent(self, sample):
 
     def encode_condition(self, sample):
         prompt = sample["prompt"]
+        return self.encode_prompt_condition(prompt)
+
+    def encode_prompt_condition(self, prompt):
         prompt_embed, prompt_embed_mask = self.text_pipeline.encode_prompt(
             prompt=prompt,
             device=self.device,

lightx2v_train/lightx2v_train/schedulers/__init__.py

@@ -0,0 +1,4 @@
+from .dmd_scheduler import DMDFlowMatchingScheduler
+from .flow_matching import RectifiedFlowMatchingScheduler
+
+__all__ = ["DMDFlowMatchingScheduler", "RectifiedFlowMatchingScheduler"]

lightx2v_train/lightx2v_train/schedulers/dmd_scheduler.py

@@ -0,0 +1,55 @@
+import torch
+
+from .flow_matching import RectifiedFlowMatchingScheduler
+
+
+class DMDFlowMatchingScheduler(RectifiedFlowMatchingScheduler):
+    def __init__(self, config, dmd_config={}):
+        super().__init__(config)
+        self.renoise_shift = float(dmd_config.get("renoise_shift", 5.0))
+        self.renoise_sigma_min = float(dmd_config.get("renoise_sigma_min", dmd_config.get("sigma_min", 0.02)))
+        self.renoise_sigma_max = float(dmd_config.get("renoise_sigma_max", dmd_config.get("sigma_max", 1.0)))
+        self.renoise_discrete_samples = int(dmd_config.get("renoise_discrete_samples", dmd_config.get("discrete_samples", 1000)))
+
+    @staticmethod
+    def linear_shift(mu, t):
+        return mu / (mu + (1 / t - 1))
+
+    def set_timesteps(self, num_inference_steps, sigmas=None, latent_hw=None, device=None):
+        super().set_timesteps(num_inference_steps, sigmas=sigmas, latent_hw=latent_hw)
+        if device is not None:
+            self.infer_sigmas = self.infer_sigmas.to(device)
+            self.infer_timesteps = self.infer_timesteps.to(device)
+        self.sigmas = self.infer_sigmas
+        self.timesteps = self.infer_timesteps
+
+    def sigma_at(self, step_idx, batch_size, device=None, dtype=None):
+        sigma = self.sigmas[int(step_idx)].expand(int(batch_size))
+        if device is not None or dtype is not None:
+            sigma = sigma.to(device=device, dtype=dtype)
+        return sigma
+
+    def sample_renoise_sigma(self, batch_size, device=None, dtype=None):
+        device = device or self.device
+        raw = torch.rand((int(batch_size),), device=device, dtype=torch.float32)
+        if self.renoise_discrete_samples > 0:
+            raw = torch.ceil(raw * self.renoise_discrete_samples) / self.renoise_discrete_samples
+        raw = torch.clamp(raw, 1e-7, 1 - 1e-7)
+        sigma = torch.clamp(self.linear_shift(self.renoise_shift, raw), self.renoise_sigma_min, self.renoise_sigma_max)
+        if dtype is not None:
+            sigma = sigma.to(dtype=dtype)
+        return sigma
+
+    def add_noise(self, latent, noise, sigmas):
+        sigmas = sigmas.to(device=latent.device)
+        sigmas = self._expand_to_ndim(sigmas, latent.ndim)
+        return ((1.0 - sigmas) * latent + sigmas * noise).to(dtype=latent.dtype)
+
+    def step_by_index(self, velocity, step_idx, sample):
+        sigma = self.sigma_at(step_idx, sample.shape[0], device=sample.device)
+        sigma_next = self.sigma_at(int(step_idx) + 1, sample.shape[0], device=sample.device)
+        sigma = self._expand_to_ndim(sigma, sample.ndim)
+        sigma_next = self._expand_to_ndim(sigma_next, sample.ndim)
+        next_sample = sample + (sigma_next - sigma) * velocity
+        x0 = sample - sigma * velocity
+        return next_sample.to(sample.dtype), x0.to(sample.dtype)

lightx2v_train/lightx2v_train/trainers/__init__.py

@@ -1,5 +1,6 @@
 from lightx2v_train.utils.registry import build_trainer
 
+from .dmd_lora import DmdLoraTrainer
 from .lora import LoraTrainer
 
-__all__ = ["build_trainer", "LoraTrainer"]
+__all__ = ["build_trainer", "DmdLoraTrainer", "LoraTrainer"]