mirror of
https://github.com/modelscope/DiffSynth-Studio.git
synced 2026-03-18 22:08:13 +00:00
76 lines
3.1 KiB
Python
76 lines
3.1 KiB
Python
from ..models import ModelManager
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from ..prompts import SDPrompter
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from ..schedulers import EnhancedDDIMScheduler
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import torch
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from tqdm import tqdm
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from PIL import Image
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import numpy as np
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class SDPipeline(torch.nn.Module):
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def __init__(self):
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super().__init__()
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self.scheduler = EnhancedDDIMScheduler()
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def preprocess_image(self, image):
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image = torch.Tensor(np.array(image, dtype=np.float32) * (2 / 255) - 1).permute(2, 0, 1).unsqueeze(0)
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return image
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@torch.no_grad()
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def __call__(
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self,
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model_manager: ModelManager,
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prompter: SDPrompter,
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prompt,
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negative_prompt="",
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cfg_scale=7.5,
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clip_skip=1,
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init_image=None,
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denoising_strength=1.0,
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height=512,
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width=512,
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num_inference_steps=20,
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tiled=False,
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tile_size=64,
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tile_stride=32,
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progress_bar_cmd=tqdm,
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progress_bar_st=None,
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):
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# Encode prompts
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prompt_emb = prompter.encode_prompt(model_manager.text_encoder, prompt, clip_skip=clip_skip, device=model_manager.device)
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negative_prompt_emb = prompter.encode_prompt(model_manager.text_encoder, negative_prompt, clip_skip=clip_skip, device=model_manager.device)
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# Prepare scheduler
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self.scheduler.set_timesteps(num_inference_steps, denoising_strength)
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# Prepare latent tensors
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if init_image is not None:
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image = self.preprocess_image(init_image).to(device=model_manager.device, dtype=model_manager.torch_type)
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latents = model_manager.vae_encoder(image, tiled=tiled, tile_size=tile_size, tile_stride=tile_stride)
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noise = torch.randn((1, 4, height//8, width//8), device=model_manager.device, dtype=model_manager.torch_type)
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latents = self.scheduler.add_noise(latents, noise, timestep=self.scheduler.timesteps[0])
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else:
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latents = torch.randn((1, 4, height//8, width//8), device=model_manager.device, dtype=model_manager.torch_type)
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# Denoise
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for progress_id, timestep in enumerate(progress_bar_cmd(self.scheduler.timesteps)):
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timestep = torch.IntTensor((timestep,))[0].to(model_manager.device)
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# Classifier-free guidance
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noise_pred_cond = model_manager.unet(latents, timestep, prompt_emb, tiled=tiled, tile_size=tile_size, tile_stride=tile_stride)
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noise_pred_uncond = model_manager.unet(latents, timestep, negative_prompt_emb, tiled=tiled, tile_size=tile_size, tile_stride=tile_stride)
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noise_pred = noise_pred_uncond + cfg_scale * (noise_pred_cond - noise_pred_uncond)
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latents = self.scheduler.step(noise_pred, timestep, latents)
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if progress_bar_st is not None:
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progress_bar_st.progress(progress_id / len(self.scheduler.timesteps))
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# Decode image
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image = model_manager.vae_decoder(latents, tiled=tiled, tile_size=tile_size, tile_stride=tile_stride)[0]
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image = image.cpu().permute(1, 2, 0).numpy()
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image = Image.fromarray(((image / 2 + 0.5).clip(0, 1) * 255).astype("uint8"))
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return image
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