Delete clip_guided_stable_diffusion.py

clip_guided_stable_diffusion.py

@@ -1,337 +0,0 @@
-import inspect
-from typing import List, Optional, Union
-
-import torch
-from torch import nn
-from torch.nn import functional as F
-from torchvision import transforms
-from transformers import CLIPImageProcessor, CLIPModel, CLIPTextModel, CLIPTokenizer
-
-from diffusers import (
-    AutoencoderKL,
-    DDIMScheduler,
-    DPMSolverMultistepScheduler,
-    LMSDiscreteScheduler,
-    PNDMScheduler,
-    UNet2DConditionModel,
-)
-from diffusers.pipelines.pipeline_utils import DiffusionPipeline, StableDiffusionMixin
-from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion import StableDiffusionPipelineOutput
-
-
-class MakeCutouts(nn.Module):
-    def __init__(self, cut_size, cut_power=1.0):
-        super().__init__()
-
-        self.cut_size = cut_size
-        self.cut_power = cut_power
-
-    def forward(self, pixel_values, num_cutouts):
-        sideY, sideX = pixel_values.shape[2:4]
-        max_size = min(sideX, sideY)
-        min_size = min(sideX, sideY, self.cut_size)
-        cutouts = []
-        for _ in range(num_cutouts):
-            size = int(torch.rand([]) ** self.cut_power * (max_size - min_size) + min_size)
-            offsetx = torch.randint(0, sideX - size + 1, ())
-            offsety = torch.randint(0, sideY - size + 1, ())
-            cutout = pixel_values[:, :, offsety : offsety + size, offsetx : offsetx + size]
-            cutouts.append(F.adaptive_avg_pool2d(cutout, self.cut_size))
-        return torch.cat(cutouts)
-
-
-def spherical_dist_loss(x, y):
-    x = F.normalize(x, dim=-1)
-    y = F.normalize(y, dim=-1)
-    return (x - y).norm(dim=-1).div(2).arcsin().pow(2).mul(2)
-
-
-def set_requires_grad(model, value):
-    for param in model.parameters():
-        param.requires_grad = value
-
-
-class CLIPGuidedStableDiffusion(DiffusionPipeline, StableDiffusionMixin):
-    """CLIP guided stable diffusion based on the amazing repo by @crowsonkb and @Jack000
-    - https://github.com/Jack000/glid-3-xl
-    - https://github.dev/crowsonkb/k-diffusion
-    """
-
-    def __init__(
-        self,
-        vae: AutoencoderKL,
-        text_encoder: CLIPTextModel,
-        clip_model: CLIPModel,
-        tokenizer: CLIPTokenizer,
-        unet: UNet2DConditionModel,
-        scheduler: Union[PNDMScheduler, LMSDiscreteScheduler, DDIMScheduler, DPMSolverMultistepScheduler],
-        feature_extractor: CLIPImageProcessor,
-    ):
-        super().__init__()
-        self.register_modules(
-            vae=vae,
-            text_encoder=text_encoder,
-            clip_model=clip_model,
-            tokenizer=tokenizer,
-            unet=unet,
-            scheduler=scheduler,
-            feature_extractor=feature_extractor,
-        )
-
-        self.normalize = transforms.Normalize(mean=feature_extractor.image_mean, std=feature_extractor.image_std)
-        self.cut_out_size = (
-            feature_extractor.size
-            if isinstance(feature_extractor.size, int)
-            else feature_extractor.size["shortest_edge"]
-        )
-        self.make_cutouts = MakeCutouts(self.cut_out_size)
-
-        set_requires_grad(self.text_encoder, False)
-        set_requires_grad(self.clip_model, False)
-
-    def freeze_vae(self):
-        set_requires_grad(self.vae, False)
-
-    def unfreeze_vae(self):
-        set_requires_grad(self.vae, True)
-
-    def freeze_unet(self):
-        set_requires_grad(self.unet, False)
-
-    def unfreeze_unet(self):
-        set_requires_grad(self.unet, True)
-
-    @torch.enable_grad()
-    def cond_fn(
-        self,
-        latents,
-        timestep,
-        index,
-        text_embeddings,
-        noise_pred_original,
-        text_embeddings_clip,
-        clip_guidance_scale,
-        num_cutouts,
-        use_cutouts=True,
-    ):
-        latents = latents.detach().requires_grad_()
-
-        latent_model_input = self.scheduler.scale_model_input(latents, timestep)
-
-        # predict the noise residual
-        noise_pred = self.unet(latent_model_input, timestep, encoder_hidden_states=text_embeddings).sample
-
-        if isinstance(self.scheduler, (PNDMScheduler, DDIMScheduler, DPMSolverMultistepScheduler)):
-            alpha_prod_t = self.scheduler.alphas_cumprod[timestep]
-            beta_prod_t = 1 - alpha_prod_t
-            # compute predicted original sample from predicted noise also called
-            # "predicted x_0" of formula (12) from https://arxiv.org/pdf/2010.02502.pdf
-            pred_original_sample = (latents - beta_prod_t ** (0.5) * noise_pred) / alpha_prod_t ** (0.5)
-
-            fac = torch.sqrt(beta_prod_t)
-            sample = pred_original_sample * (fac) + latents * (1 - fac)
-        elif isinstance(self.scheduler, LMSDiscreteScheduler):
-            sigma = self.scheduler.sigmas[index]
-            sample = latents - sigma * noise_pred
-        else:
-            raise ValueError(f"scheduler type {type(self.scheduler)} not supported")
-
-        sample = 1 / self.vae.config.scaling_factor * sample
-        image = self.vae.decode(sample).sample
-        image = (image / 2 + 0.5).clamp(0, 1)
-
-        if use_cutouts:
-            image = self.make_cutouts(image, num_cutouts)
-        else:
-            image = transforms.Resize(self.cut_out_size)(image)
-        image = self.normalize(image).to(latents.dtype)
-
-        image_embeddings_clip = self.clip_model.get_image_features(image)
-        image_embeddings_clip = image_embeddings_clip / image_embeddings_clip.norm(p=2, dim=-1, keepdim=True)
-
-        if use_cutouts:
-            dists = spherical_dist_loss(image_embeddings_clip, text_embeddings_clip)
-            dists = dists.view([num_cutouts, sample.shape[0], -1])
-            loss = dists.sum(2).mean(0).sum() * clip_guidance_scale
-        else:
-            loss = spherical_dist_loss(image_embeddings_clip, text_embeddings_clip).mean() * clip_guidance_scale
-
-        grads = -torch.autograd.grad(loss, latents)[0]
-
-        if isinstance(self.scheduler, LMSDiscreteScheduler):
-            latents = latents.detach() + grads * (sigma**2)
-            noise_pred = noise_pred_original
-        else:
-            noise_pred = noise_pred_original - torch.sqrt(beta_prod_t) * grads
-        return noise_pred, latents
-
-    @torch.no_grad()
-    def __call__(
-        self,
-        prompt: Union[str, List[str]],
-        height: Optional[int] = 512,
-        width: Optional[int] = 512,
-        num_inference_steps: Optional[int] = 50,
-        guidance_scale: Optional[float] = 7.5,
-        num_images_per_prompt: Optional[int] = 1,
-        eta: float = 0.0,
-        clip_guidance_scale: Optional[float] = 100,
-        clip_prompt: Optional[Union[str, List[str]]] = None,
-        num_cutouts: Optional[int] = 4,
-        use_cutouts: Optional[bool] = True,
-        generator: Optional[torch.Generator] = None,
-        latents: Optional[torch.Tensor] = None,
-        output_type: Optional[str] = "pil",
-        return_dict: bool = True,
-    ):
-        if isinstance(prompt, str):
-            batch_size = 1
-        elif isinstance(prompt, list):
-            batch_size = len(prompt)
-        else:
-            raise ValueError(f"`prompt` has to be of type `str` or `list` but is {type(prompt)}")
-
-        if height % 8 != 0 or width % 8 != 0:
-            raise ValueError(f"`height` and `width` have to be divisible by 8 but are {height} and {width}.")
-
-        # get prompt text embeddings
-        text_input = self.tokenizer(
-            prompt,
-            padding="max_length",
-            max_length=self.tokenizer.model_max_length,
-            truncation=True,
-            return_tensors="pt",
-        )
-        text_embeddings = self.text_encoder(text_input.input_ids.to(self.device))[0]
-        # duplicate text embeddings for each generation per prompt
-        text_embeddings = text_embeddings.repeat_interleave(num_images_per_prompt, dim=0)
-
-        if clip_guidance_scale > 0:
-            if clip_prompt is not None:
-                clip_text_input = self.tokenizer(
-                    clip_prompt,
-                    padding="max_length",
-                    max_length=self.tokenizer.model_max_length,
-                    truncation=True,
-                    return_tensors="pt",
-                ).input_ids.to(self.device)
-            else:
-                clip_text_input = text_input.input_ids.to(self.device)
-            text_embeddings_clip = self.clip_model.get_text_features(clip_text_input)
-            text_embeddings_clip = text_embeddings_clip / text_embeddings_clip.norm(p=2, dim=-1, keepdim=True)
-            # duplicate text embeddings clip for each generation per prompt
-            text_embeddings_clip = text_embeddings_clip.repeat_interleave(num_images_per_prompt, dim=0)
-
-        # here `guidance_scale` is defined analog to the guidance weight `w` of equation (2)
-        # of the Imagen paper: https://arxiv.org/pdf/2205.11487.pdf . `guidance_scale = 1`
-        # corresponds to doing no classifier free guidance.
-        do_classifier_free_guidance = guidance_scale > 1.0
-        # get unconditional embeddings for classifier free guidance
-        if do_classifier_free_guidance:
-            max_length = text_input.input_ids.shape[-1]
-            uncond_input = self.tokenizer([""], padding="max_length", max_length=max_length, return_tensors="pt")
-            uncond_embeddings = self.text_encoder(uncond_input.input_ids.to(self.device))[0]
-            # duplicate unconditional embeddings for each generation per prompt
-            uncond_embeddings = uncond_embeddings.repeat_interleave(num_images_per_prompt, dim=0)
-
-            # For classifier free guidance, we need to do two forward passes.
-            # Here we concatenate the unconditional and text embeddings into a single batch
-            # to avoid doing two forward passes
-            text_embeddings = torch.cat([uncond_embeddings, text_embeddings])
-
-        # get the initial random noise unless the user supplied it
-
-        # Unlike in other pipelines, latents need to be generated in the target device
-        # for 1-to-1 results reproducibility with the CompVis implementation.
-        # However this currently doesn't work in `mps`.
-        latents_shape = (batch_size * num_images_per_prompt, self.unet.config.in_channels, height // 8, width // 8)
-        latents_dtype = text_embeddings.dtype
-        if latents is None:
-            if self.device.type == "mps":
-                # randn does not work reproducibly on mps
-                latents = torch.randn(latents_shape, generator=generator, device="cpu", dtype=latents_dtype).to(
-                    self.device
-                )
-            else:
-                latents = torch.randn(latents_shape, generator=generator, device=self.device, dtype=latents_dtype)
-        else:
-            if latents.shape != latents_shape:
-                raise ValueError(f"Unexpected latents shape, got {latents.shape}, expected {latents_shape}")
-            latents = latents.to(self.device)
-
-        # set timesteps
-        accepts_offset = "offset" in set(inspect.signature(self.scheduler.set_timesteps).parameters.keys())
-        extra_set_kwargs = {}
-        if accepts_offset:
-            extra_set_kwargs["offset"] = 1
-
-        self.scheduler.set_timesteps(num_inference_steps, **extra_set_kwargs)
-
-        # Some schedulers like PNDM have timesteps as arrays
-        # It's more optimized to move all timesteps to correct device beforehand
-        timesteps_tensor = self.scheduler.timesteps.to(self.device)
-
-        # scale the initial noise by the standard deviation required by the scheduler
-        latents = latents * self.scheduler.init_noise_sigma
-
-        # prepare extra kwargs for the scheduler step, since not all schedulers have the same signature
-        # eta (η) is only used with the DDIMScheduler, it will be ignored for other schedulers.
-        # eta corresponds to η in DDIM paper: https://arxiv.org/abs/2010.02502
-        # and should be between [0, 1]
-        accepts_eta = "eta" in set(inspect.signature(self.scheduler.step).parameters.keys())
-        extra_step_kwargs = {}
-        if accepts_eta:
-            extra_step_kwargs["eta"] = eta
-
-        # check if the scheduler accepts generator
-        accepts_generator = "generator" in set(inspect.signature(self.scheduler.step).parameters.keys())
-        if accepts_generator:
-            extra_step_kwargs["generator"] = generator
-
-        for i, t in enumerate(self.progress_bar(timesteps_tensor)):
-            # expand the latents if we are doing classifier free guidance
-            latent_model_input = torch.cat([latents] * 2) if do_classifier_free_guidance else latents
-            latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
-
-            # predict the noise residual
-            noise_pred = self.unet(latent_model_input, t, encoder_hidden_states=text_embeddings).sample
-
-            # perform classifier free guidance
-            if do_classifier_free_guidance:
-                noise_pred_uncond, noise_pred_text = noise_pred.chunk(2)
-                noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
-
-            # perform clip guidance
-            if clip_guidance_scale > 0:
-                text_embeddings_for_guidance = (
-                    text_embeddings.chunk(2)[1] if do_classifier_free_guidance else text_embeddings
-                )
-                noise_pred, latents = self.cond_fn(
-                    latents,
-                    t,
-                    i,
-                    text_embeddings_for_guidance,
-                    noise_pred,
-                    text_embeddings_clip,
-                    clip_guidance_scale,
-                    num_cutouts,
-                    use_cutouts,
-                )
-
-            # compute the previous noisy sample x_t -> x_t-1
-            latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample
-
-        # scale and decode the image latents with vae
-        latents = 1 / self.vae.config.scaling_factor * latents
-        image = self.vae.decode(latents).sample
-
-        image = (image / 2 + 0.5).clamp(0, 1)
-        image = image.cpu().permute(0, 2, 3, 1).numpy()
-
-        if output_type == "pil":
-            image = self.numpy_to_pil(image)
-
-        if not return_dict:
-            return (image, None)
-
-        return StableDiffusionPipelineOutput(images=image, nsfw_content_detected=None)