diffsynth/pipelines/wan_video.py

from ..models import ModelManager
from ..models.wan_video_dit import WanModel
from ..models.wan_video_text_encoder import WanTextEncoder
from ..models.wan_video_vae import WanVideoVAE
from ..models.wan_video_image_encoder import WanImageEncoder
from ..schedulers.flow_match import FlowMatchScheduler
from .base import BasePipeline
from ..prompters import WanPrompter
import torch, os
from einops import rearrange
import numpy as np
from PIL import Image
from tqdm import tqdm

from ..vram_management import enable_vram_management, AutoWrappedModule, AutoWrappedLinear
from ..models.wan_video_text_encoder import T5RelativeEmbedding, T5LayerNorm
from ..models.wan_video_dit import RMSNorm
from ..models.wan_video_vae import RMS_norm, CausalConv3d, Upsample



class WanVideoPipeline(BasePipeline):

    def __init__(self, device="cuda", torch_dtype=torch.float16, tokenizer_path=None):
        super().__init__(device=device, torch_dtype=torch_dtype)
        self.scheduler = FlowMatchScheduler(shift=5, sigma_min=0.0, extra_one_step=True)
        self.prompter = WanPrompter(tokenizer_path=tokenizer_path)
        self.text_encoder: WanTextEncoder = None
        self.image_encoder: WanImageEncoder = None
        self.dit: WanModel = None
        self.vae: WanVideoVAE = None
        self.model_names = ['text_encoder', 'dit', 'vae']
        self.height_division_factor = 16
        self.width_division_factor = 16


    def enable_vram_management(self, num_persistent_param_in_dit=None):
        dtype = next(iter(self.text_encoder.parameters())).dtype
        enable_vram_management(
            self.text_encoder,
            module_map = {
                torch.nn.Linear: AutoWrappedLinear,
                torch.nn.Embedding: AutoWrappedModule,
                T5RelativeEmbedding: AutoWrappedModule,
                T5LayerNorm: AutoWrappedModule,
            },
            module_config = dict(
                offload_dtype=dtype,
                offload_device="cpu",
                onload_dtype=dtype,
                onload_device="cpu",
                computation_dtype=self.torch_dtype,
                computation_device=self.device,
            ),
        )
        dtype = next(iter(self.dit.parameters())).dtype
        enable_vram_management(
            self.dit,
            module_map = {
                torch.nn.Linear: AutoWrappedLinear,
                torch.nn.Conv3d: AutoWrappedModule,
                torch.nn.LayerNorm: AutoWrappedModule,
                RMSNorm: AutoWrappedModule,
            },
            module_config = dict(
                offload_dtype=dtype,
                offload_device="cpu",
                onload_dtype=dtype,
                onload_device=self.device,
                computation_dtype=self.torch_dtype,
                computation_device=self.device,
            ),
            max_num_param=num_persistent_param_in_dit,
            overflow_module_config = dict(
                offload_dtype=dtype,
                offload_device="cpu",
                onload_dtype=dtype,
                onload_device="cpu",
                computation_dtype=self.torch_dtype,
                computation_device=self.device,
            ),
        )
        dtype = next(iter(self.vae.parameters())).dtype
        enable_vram_management(
            self.vae,
            module_map = {
                torch.nn.Linear: AutoWrappedLinear,
                torch.nn.Conv2d: AutoWrappedModule,
                RMS_norm: AutoWrappedModule,
                CausalConv3d: AutoWrappedModule,
                Upsample: AutoWrappedModule,
                torch.nn.SiLU: AutoWrappedModule,
                torch.nn.Dropout: AutoWrappedModule,
            },
            module_config = dict(
                offload_dtype=dtype,
                offload_device="cpu",
                onload_dtype=dtype,
                onload_device=self.device,
                computation_dtype=self.torch_dtype,
                computation_device=self.device,
            ),
        )
        if self.image_encoder is not None:
            dtype = next(iter(self.image_encoder.parameters())).dtype
            enable_vram_management(
                self.image_encoder,
                module_map = {
                    torch.nn.Linear: AutoWrappedLinear,
                    torch.nn.Conv2d: AutoWrappedModule,
                    torch.nn.LayerNorm: AutoWrappedModule,
                },
                module_config = dict(
                    offload_dtype=dtype,
                    offload_device="cpu",
                    onload_dtype=dtype,
                    onload_device="cpu",
                    computation_dtype=dtype,
                    computation_device=self.device,
                ),
            )
        self.enable_cpu_offload()


    def fetch_models(self, model_manager: ModelManager):
        text_encoder_model_and_path = model_manager.fetch_model("wan_video_text_encoder", require_model_path=True)
        if text_encoder_model_and_path is not None:
            self.text_encoder, tokenizer_path = text_encoder_model_and_path
            self.prompter.fetch_models(self.text_encoder)
            self.prompter.fetch_tokenizer(os.path.join(os.path.dirname(tokenizer_path), "google/umt5-xxl"))
        self.dit = model_manager.fetch_model("wan_video_dit")
        self.vae = model_manager.fetch_model("wan_video_vae")
        self.image_encoder = model_manager.fetch_model("wan_video_image_encoder")


    @staticmethod
    def from_model_manager(model_manager: ModelManager, torch_dtype=None, device=None):
        if device is None: device = model_manager.device
        if torch_dtype is None: torch_dtype = model_manager.torch_dtype
        pipe = WanVideoPipeline(device=device, torch_dtype=torch_dtype)
        pipe.fetch_models(model_manager)
        return pipe
    
    
    def denoising_model(self):
        return self.dit


    def encode_prompt(self, prompt, positive=True):
        prompt_emb = self.prompter.encode_prompt(prompt, positive=positive)
        return {"context": prompt_emb}
    
    
    def encode_image(self, image, num_frames, height, width):
        image = self.preprocess_image(image.resize((width, height))).to(self.device)
        clip_context = self.image_encoder.encode_image([image])
        msk = torch.ones(1, num_frames, height//8, width//8, device=self.device)
        msk[:, 1:] = 0
        msk = torch.concat([torch.repeat_interleave(msk[:, 0:1], repeats=4, dim=1), msk[:, 1:]], dim=1)
        msk = msk.view(1, msk.shape[1] // 4, 4, height//8, width//8)
        msk = msk.transpose(1, 2)[0]
        
        vae_input = torch.concat([image.transpose(0, 1), torch.zeros(3, num_frames-1, height, width).to(image.device)], dim=1)
        y = self.vae.encode([vae_input.to(dtype=self.torch_dtype, device=self.device)], device=self.device)[0]
        y = torch.concat([msk, y])
        y = y.unsqueeze(0)
        clip_context = clip_context.to(dtype=self.torch_dtype, device=self.device)
        y = y.to(dtype=self.torch_dtype, device=self.device)
        return {"clip_feature": clip_context, "y": y}


    def tensor2video(self, frames):
        frames = rearrange(frames, "C T H W -> T H W C")
        frames = ((frames.float() + 1) * 127.5).clip(0, 255).cpu().numpy().astype(np.uint8)
        frames = [Image.fromarray(frame) for frame in frames]
        return frames
    
    
    def prepare_extra_input(self, latents=None):
        return {}
    
    
    def encode_video(self, input_video, tiled=True, tile_size=(34, 34), tile_stride=(18, 16)):
        latents = self.vae.encode(input_video, device=self.device, tiled=tiled, tile_size=tile_size, tile_stride=tile_stride)
        return latents
    
    
    def decode_video(self, latents, tiled=True, tile_size=(34, 34), tile_stride=(18, 16)):
        frames = self.vae.decode(latents, device=self.device, tiled=tiled, tile_size=tile_size, tile_stride=tile_stride)
        return frames


    @torch.no_grad()
    def __call__(
        self,
        prompt,
        negative_prompt="",
        input_image=None,
        input_video=None,
        denoising_strength=1.0,
        seed=None,
        rand_device="cpu",
        height=480,
        width=832,
        num_frames=81,
        cfg_scale=5.0,
        num_inference_steps=50,
        sigma_shift=5.0,
        tiled=True,
        tile_size=(30, 52),
        tile_stride=(15, 26),
        progress_bar_cmd=tqdm,
        progress_bar_st=None,
    ):
        # Parameter check
        height, width = self.check_resize_height_width(height, width)
        if num_frames % 4 != 1:
            num_frames = (num_frames + 2) // 4 * 4 + 1
            print(f"Only `num_frames % 4 != 1` is acceptable. We round it up to {num_frames}.")
        
        # Tiler parameters
        tiler_kwargs = {"tiled": tiled, "tile_size": tile_size, "tile_stride": tile_stride}

        # Scheduler
        self.scheduler.set_timesteps(num_inference_steps, denoising_strength, shift=sigma_shift)

        # Initialize noise
        noise = self.generate_noise((1, 16, (num_frames - 1) // 4 + 1, height//8, width//8), seed=seed, device=rand_device, dtype=torch.float32)
        noise = noise.to(dtype=self.torch_dtype, device=self.device)
        if input_video is not None:
            self.load_models_to_device(['vae'])
            input_video = self.preprocess_images(input_video)
            input_video = torch.stack(input_video, dim=2).to(dtype=self.torch_dtype, device=self.device)
            latents = self.encode_video(input_video, **tiler_kwargs).to(dtype=self.torch_dtype, device=self.device)
            latents = self.scheduler.add_noise(latents, noise, timestep=self.scheduler.timesteps[0])
        else:
            latents = noise
        
        # Encode prompts
        self.load_models_to_device(["text_encoder"])
        prompt_emb_posi = self.encode_prompt(prompt, positive=True)
        if cfg_scale != 1.0:
            prompt_emb_nega = self.encode_prompt(negative_prompt, positive=False)
            
        # Encode image
        if input_image is not None and self.image_encoder is not None:
            self.load_models_to_device(["image_encoder", "vae"])
            image_emb = self.encode_image(input_image, num_frames, height, width)
        else:
            image_emb = {}
            
        # Extra input
        extra_input = self.prepare_extra_input(latents)

        # Denoise
        self.load_models_to_device(["dit"])
        for progress_id, timestep in enumerate(progress_bar_cmd(self.scheduler.timesteps)):
            timestep = timestep.unsqueeze(0).to(dtype=self.torch_dtype, device=self.device)

            # Inference
            noise_pred_posi = self.dit(latents, timestep=timestep, **prompt_emb_posi, **image_emb, **extra_input)
            if cfg_scale != 1.0:
                noise_pred_nega = self.dit(latents, timestep=timestep, **prompt_emb_nega, **image_emb, **extra_input)
                noise_pred = noise_pred_nega + cfg_scale * (noise_pred_posi - noise_pred_nega)
            else:
                noise_pred = noise_pred_posi

            # Scheduler
            latents = self.scheduler.step(noise_pred, self.scheduler.timesteps[progress_id], latents)

        # Decode
        self.load_models_to_device(['vae'])
        frames = self.decode_video(latents, **tiler_kwargs)
        self.load_models_to_device([])
        frames = self.tensor2video(frames[0])

        return frames