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https://github.com/modelscope/DiffSynth-Studio.git
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add research tutorial sec 1
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Artiprocher
341
docs/zh/Research_Tutorial/train_from_scratch.py
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341
docs/zh/Research_Tutorial/train_from_scratch.py
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import torch, accelerate
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from PIL import Image
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from typing import Union
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from tqdm import tqdm
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from einops import rearrange, repeat
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from transformers import AutoProcessor, AutoTokenizer
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from diffsynth.core import ModelConfig, gradient_checkpoint_forward, attention_forward, UnifiedDataset, load_model
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from diffsynth.diffusion import FlowMatchScheduler, DiffusionTrainingModule, FlowMatchSFTLoss, ModelLogger, launch_training_task
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from diffsynth.diffusion.base_pipeline import BasePipeline, PipelineUnit
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from diffsynth.models.general_modules import TimestepEmbeddings
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from diffsynth.models.z_image_text_encoder import ZImageTextEncoder
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from diffsynth.models.flux2_vae import Flux2VAE
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class AAAPositionalEmbedding(torch.nn.Module):
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def __init__(self, height=16, width=16, dim=1024):
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super().__init__()
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self.image_emb = torch.nn.Parameter(torch.randn((1, dim, height, width)))
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self.text_emb = torch.nn.Parameter(torch.randn((dim,)))
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def forward(self, image, text):
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height, width = image.shape[-2:]
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image_emb = self.image_emb.to(device=image.device, dtype=image.dtype)
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image_emb = torch.nn.functional.interpolate(image_emb, size=(height, width), mode="bilinear")
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image_emb = rearrange(image_emb, "B C H W -> B (H W) C")
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text_emb = self.text_emb.to(device=text.device, dtype=text.dtype)
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text_emb = repeat(text_emb, "C -> B L C", B=text.shape[0], L=text.shape[1])
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emb = torch.concat([image_emb, text_emb], dim=1)
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return emb
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class AAABlock(torch.nn.Module):
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def __init__(self, dim=1024, num_heads=32):
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super().__init__()
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self.norm_attn = torch.nn.RMSNorm(dim, elementwise_affine=False)
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self.to_q = torch.nn.Linear(dim, dim)
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self.to_k = torch.nn.Linear(dim, dim)
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self.to_v = torch.nn.Linear(dim, dim)
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self.to_out = torch.nn.Linear(dim, dim)
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self.norm_mlp = torch.nn.RMSNorm(dim, elementwise_affine=False)
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self.ff = torch.nn.Sequential(
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torch.nn.Linear(dim, dim*3),
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torch.nn.SiLU(),
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torch.nn.Linear(dim*3, dim),
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)
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self.to_gate = torch.nn.Linear(dim, dim * 2)
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self.num_heads = num_heads
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def attention(self, emb, pos_emb):
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emb = self.norm_attn(emb + pos_emb)
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q, k, v = self.to_q(emb), self.to_k(emb), self.to_v(emb)
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emb = attention_forward(
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q, k, v,
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q_pattern="b s (n d)", k_pattern="b s (n d)", v_pattern="b s (n d)", out_pattern="b s (n d)",
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dims={"n": self.num_heads},
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)
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emb = self.to_out(emb)
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return emb
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def feed_forward(self, emb, pos_emb):
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emb = self.norm_mlp(emb + pos_emb)
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emb = self.ff(emb)
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return emb
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def forward(self, emb, pos_emb, t_emb):
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gate_attn, gate_mlp = self.to_gate(t_emb).chunk(2, dim=-1)
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emb = emb + self.attention(emb, pos_emb) * (1 + gate_attn)
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emb = emb + self.feed_forward(emb, pos_emb) * (1 + gate_mlp)
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return emb
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class AAADiT(torch.nn.Module):
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def __init__(self, dim=1024):
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super().__init__()
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self.pos_embedder = AAAPositionalEmbedding(dim=dim)
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self.timestep_embedder = TimestepEmbeddings(256, dim)
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self.image_embedder = torch.nn.Sequential(torch.nn.Linear(128, dim), torch.nn.LayerNorm(dim))
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self.text_embedder = torch.nn.Sequential(torch.nn.Linear(1024, dim), torch.nn.LayerNorm(dim))
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self.blocks = torch.nn.ModuleList([AAABlock(dim) for _ in range(10)])
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self.proj_out = torch.nn.Linear(dim, 128)
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def forward(
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self,
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latents,
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prompt_embeds,
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timestep,
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use_gradient_checkpointing=False,
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use_gradient_checkpointing_offload=False,
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):
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pos_emb = self.pos_embedder(latents, prompt_embeds)
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t_emb = self.timestep_embedder(timestep, dtype=latents.dtype).view(1, 1, -1)
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image = self.image_embedder(rearrange(latents, "B C H W -> B (H W) C"))
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text = self.text_embedder(prompt_embeds)
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emb = torch.concat([image, text], dim=1)
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for block_id, block in enumerate(self.blocks):
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emb = gradient_checkpoint_forward(
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block,
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use_gradient_checkpointing=use_gradient_checkpointing,
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use_gradient_checkpointing_offload=use_gradient_checkpointing_offload,
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emb=emb,
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pos_emb=pos_emb,
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t_emb=t_emb,
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)
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emb = emb[:, :latents.shape[-1] * latents.shape[-2]]
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emb = self.proj_out(emb)
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emb = rearrange(emb, "B (H W) C -> B C H W", W=latents.shape[-1])
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return emb
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class AAAImagePipeline(BasePipeline):
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def __init__(self, device="cuda", torch_dtype=torch.bfloat16):
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super().__init__(
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device=device, torch_dtype=torch_dtype,
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height_division_factor=16, width_division_factor=16,
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)
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self.scheduler = FlowMatchScheduler("FLUX.2")
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self.text_encoder: ZImageTextEncoder = None
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self.dit: AAADiT = None
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self.vae: Flux2VAE = None
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self.tokenizer: AutoProcessor = None
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self.in_iteration_models = ("dit",)
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self.units = [
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AAAUnit_PromptEmbedder(),
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AAAUnit_NoiseInitializer(),
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AAAUnit_InputImageEmbedder(),
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]
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self.model_fn = model_fn_aaa
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@staticmethod
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def from_pretrained(
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torch_dtype: torch.dtype = torch.bfloat16,
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device: Union[str, torch.device] = "cuda",
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model_configs: list[ModelConfig] = [],
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tokenizer_config: ModelConfig = None,
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vram_limit: float = None,
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):
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# Initialize pipeline
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pipe = AAAImagePipeline(device=device, torch_dtype=torch_dtype)
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model_pool = pipe.download_and_load_models(model_configs, vram_limit)
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# Fetch models
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pipe.text_encoder = model_pool.fetch_model("z_image_text_encoder")
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pipe.dit = model_pool.fetch_model("aaa_dit")
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pipe.vae = model_pool.fetch_model("flux2_vae")
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if tokenizer_config is not None:
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tokenizer_config.download_if_necessary()
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pipe.tokenizer = AutoTokenizer.from_pretrained(tokenizer_config.path)
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# VRAM Management
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pipe.vram_management_enabled = pipe.check_vram_management_state()
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return pipe
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@torch.no_grad()
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def __call__(
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self,
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# Prompt
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prompt: str,
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negative_prompt: str = "",
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cfg_scale: float = 1.0,
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# Image
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input_image: Image.Image = None,
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denoising_strength: float = 1.0,
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# Shape
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height: int = 1024,
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width: int = 1024,
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# Randomness
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seed: int = None,
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rand_device: str = "cpu",
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# Steps
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num_inference_steps: int = 30,
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# Progress bar
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progress_bar_cmd = tqdm,
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):
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self.scheduler.set_timesteps(num_inference_steps, denoising_strength=denoising_strength, dynamic_shift_len=height//16*width//16)
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# Parameters
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inputs_posi = {"prompt": prompt}
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inputs_nega = {"negative_prompt": negative_prompt}
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inputs_shared = {
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"cfg_scale": cfg_scale,
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"input_image": input_image, "denoising_strength": denoising_strength,
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"height": height, "width": width,
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"seed": seed, "rand_device": rand_device,
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"num_inference_steps": num_inference_steps,
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}
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for unit in self.units:
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inputs_shared, inputs_posi, inputs_nega = self.unit_runner(unit, self, inputs_shared, inputs_posi, inputs_nega)
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# Denoise
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self.load_models_to_device(self.in_iteration_models)
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models = {name: getattr(self, name) for name in self.in_iteration_models}
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for progress_id, timestep in enumerate(progress_bar_cmd(self.scheduler.timesteps)):
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timestep = timestep.unsqueeze(0).to(dtype=self.torch_dtype, device=self.device)
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noise_pred = self.cfg_guided_model_fn(
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self.model_fn, cfg_scale,
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inputs_shared, inputs_posi, inputs_nega,
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**models, timestep=timestep, progress_id=progress_id
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)
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inputs_shared["latents"] = self.step(self.scheduler, progress_id=progress_id, noise_pred=noise_pred, **inputs_shared)
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# Decode
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self.load_models_to_device(['vae'])
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image = self.vae.decode(inputs_shared["latents"])
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image = self.vae_output_to_image(image)
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self.load_models_to_device([])
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return image
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class AAAUnit_PromptEmbedder(PipelineUnit):
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def __init__(self):
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super().__init__(
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seperate_cfg=True,
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input_params_posi={"prompt": "prompt"},
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input_params_nega={"prompt": "negative_prompt"},
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output_params=("prompt_embeds",),
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onload_model_names=("text_encoder",)
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)
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self.hidden_states_layers = (-1,)
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def process(self, pipe: AAAImagePipeline, prompt):
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pipe.load_models_to_device(self.onload_model_names)
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text = pipe.tokenizer.apply_chat_template(
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[{"role": "user", "content": prompt}],
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tokenize=False,
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add_generation_prompt=True,
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enable_thinking=False,
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)
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inputs = pipe.tokenizer(text, return_tensors="pt", padding="max_length", truncation=True, max_length=128).to(pipe.device)
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output = pipe.text_encoder(**inputs, output_hidden_states=True, use_cache=False)
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prompt_embeds = torch.concat([output.hidden_states[k] for k in self.hidden_states_layers], dim=-1)
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return {"prompt_embeds": prompt_embeds}
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class AAAUnit_NoiseInitializer(PipelineUnit):
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def __init__(self):
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super().__init__(
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input_params=("height", "width", "seed", "rand_device"),
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output_params=("noise",),
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)
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def process(self, pipe: AAAImagePipeline, height, width, seed, rand_device):
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noise = pipe.generate_noise((1, 128, height//16, width//16), seed=seed, rand_device=rand_device, rand_torch_dtype=pipe.torch_dtype)
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return {"noise": noise}
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class AAAUnit_InputImageEmbedder(PipelineUnit):
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def __init__(self):
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super().__init__(
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input_params=("input_image", "noise"),
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output_params=("latents", "input_latents"),
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onload_model_names=("vae",)
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)
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def process(self, pipe: AAAImagePipeline, input_image, noise):
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if input_image is None:
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return {"latents": noise, "input_latents": None}
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pipe.load_models_to_device(['vae'])
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image = pipe.preprocess_image(input_image)
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input_latents = pipe.vae.encode(image)
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if pipe.scheduler.training:
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return {"latents": noise, "input_latents": input_latents}
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else:
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latents = pipe.scheduler.add_noise(input_latents, noise, timestep=pipe.scheduler.timesteps[0])
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return {"latents": latents, "input_latents": input_latents}
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def model_fn_aaa(
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dit: AAADiT,
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latents=None,
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prompt_embeds=None,
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timestep=None,
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use_gradient_checkpointing=False,
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use_gradient_checkpointing_offload=False,
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**kwargs,
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):
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model_output = dit(
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latents,
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prompt_embeds,
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timestep,
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use_gradient_checkpointing=use_gradient_checkpointing,
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use_gradient_checkpointing_offload=use_gradient_checkpointing_offload,
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)
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return model_output
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class AAATrainingModule(DiffusionTrainingModule):
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def __init__(self, device):
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super().__init__()
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self.pipe = AAAImagePipeline.from_pretrained(
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torch_dtype=torch.bfloat16,
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device=device,
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model_configs=[
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ModelConfig(model_id="Qwen/Qwen3-0.6B", origin_file_pattern="model.safetensors"),
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ModelConfig(model_id="black-forest-labs/FLUX.2-klein-4B", origin_file_pattern="vae/diffusion_pytorch_model.safetensors"),
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],
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tokenizer_config=ModelConfig(model_id="Qwen/Qwen3-0.6B", origin_file_pattern=""),
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)
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self.pipe.dit = AAADiT().to(dtype=torch.bfloat16, device=device)
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self.pipe.freeze_except(["dit"])
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self.pipe.scheduler.set_timesteps(1000, training=True)
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def forward(self, data):
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inputs_posi = {"prompt": data["prompt"]}
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inputs_nega = {"negative_prompt": ""}
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inputs_shared = {
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"input_image": data["image"],
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"height": data["image"].size[1],
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"width": data["image"].size[0],
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"cfg_scale": 1,
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"use_gradient_checkpointing": False,
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"use_gradient_checkpointing_offload": False,
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}
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for unit in self.pipe.units:
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inputs_shared, inputs_posi, inputs_nega = self.pipe.unit_runner(unit, self.pipe, inputs_shared, inputs_posi, inputs_nega)
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loss = FlowMatchSFTLoss(self.pipe, **inputs_shared, **inputs_posi)
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return loss
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if __name__ == "__main__":
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accelerator = accelerate.Accelerator(gradient_accumulation_steps=1)
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dataset = UnifiedDataset(
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base_path="data/images",
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metadata_path="data/metadata_merged.csv",
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max_data_items=10000000,
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data_file_keys=("image",),
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main_data_operator=UnifiedDataset.default_image_operator(base_path="data/images", height=256, width=256)
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)
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model = AAATrainingModule(device=accelerator.device)
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model_logger = ModelLogger(
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"models/AAA/v1",
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remove_prefix_in_ckpt="pipe.dit.",
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)
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launch_training_task(
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accelerator, dataset, model, model_logger,
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learning_rate=2e-4,
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num_workers=4,
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save_steps=50000,
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num_epochs=999999,
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)
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