import inspect import json import math import time from pathlib import Path from typing import Callable, List, Optional, Tuple, Union import numpy as np import torch from diffusers.configuration_utils import FrozenDict from diffusers.models import AutoencoderKL, UNet2DConditionModel from diffusers.pipelines.pipeline_utils import DiffusionPipeline from diffusers.pipelines.stable_diffusion import StableDiffusionPipelineOutput from diffusers.pipelines.stable_diffusion.safety_checker import StableDiffusionSafetyChecker from diffusers.schedulers import ( DDIMScheduler, DPMSolverMultistepScheduler, EulerAncestralDiscreteScheduler, EulerDiscreteScheduler, LMSDiscreteScheduler, PNDMScheduler, ) from diffusers.utils import deprecate, logging from packaging import version from torch import nn from transformers import CLIPFeatureExtractor, CLIPTextModel, CLIPTokenizer from .upsampling import RealESRGANModel from .utils import get_timesteps_arr, make_video_pyav, slerp logging.set_verbosity_info() logger = logging.get_logger(__name__) class StableDiffusionWalkPipeline(DiffusionPipeline): r""" Pipeline for generating videos by interpolating Stable Diffusion's latent space. This model inherits from [`DiffusionPipeline`]. Check the superclass documentation for the generic methods the library implements for all the pipelines (such as downloading or saving, running on a particular device, etc.) Args: vae ([`AutoencoderKL`]): Variational Auto-Encoder (VAE) Model to encode and decode images to and from latent representations. text_encoder ([`CLIPTextModel`]): Frozen text-encoder. Stable Diffusion uses the text portion of [CLIP](https://huggingface.co/docs/transformers/model_doc/clip#transformers.CLIPTextModel), specifically the [clip-vit-large-patch14](https://huggingface.co/openai/clip-vit-large-patch14) variant. tokenizer (`CLIPTokenizer`): Tokenizer of class [CLIPTokenizer](https://huggingface.co/docs/transformers/v4.21.0/en/model_doc/clip#transformers.CLIPTokenizer). unet ([`UNet2DConditionModel`]): Conditional U-Net architecture to denoise the encoded image latents. scheduler ([`SchedulerMixin`]): A scheduler to be used in combination with `unet` to denoise the encoded image latens. Can be one of [`DDIMScheduler`], [`LMSDiscreteScheduler`], or [`PNDMScheduler`]. safety_checker ([`StableDiffusionSafetyChecker`]): Classification module that estimates whether generated images could be considered offensive or harmful. Please, refer to the [model card](https://huggingface.co/CompVis/stable-diffusion-v1-4) for details. feature_extractor ([`CLIPFeatureExtractor`]): Model that extracts features from generated images to be used as inputs for the `safety_checker`. """ _optional_components = ["safety_checker", "feature_extractor"] def __init__( self, vae: AutoencoderKL, text_encoder: CLIPTextModel, tokenizer: CLIPTokenizer, unet: UNet2DConditionModel, scheduler: Union[ DDIMScheduler, PNDMScheduler, LMSDiscreteScheduler, EulerDiscreteScheduler, EulerAncestralDiscreteScheduler, DPMSolverMultistepScheduler, ], safety_checker: StableDiffusionSafetyChecker, feature_extractor: CLIPFeatureExtractor, requires_safety_checker: bool = True, ): super().__init__() if hasattr(scheduler.config, "steps_offset") and scheduler.config.steps_offset != 1: deprecation_message = ( f"The configuration file of this scheduler: {scheduler} is outdated. `steps_offset`" f" should be set to 1 instead of {scheduler.config.steps_offset}. Please make sure " "to update the config accordingly as leaving `steps_offset` might led to incorrect results" " in future versions. If you have downloaded this checkpoint from the Hugging Face Hub," " it would be very nice if you could open a Pull request for the `scheduler/scheduler_config.json`" " file" ) deprecate("steps_offset!=1", "1.0.0", deprecation_message, standard_warn=False) new_config = dict(scheduler.config) new_config["steps_offset"] = 1 scheduler._internal_dict = FrozenDict(new_config) if hasattr(scheduler.config, "clip_sample") and scheduler.config.clip_sample is True: deprecation_message = ( f"The configuration file of this scheduler: {scheduler} has not set the configuration `clip_sample`." " `clip_sample` should be set to False in the configuration file. Please make sure to update the" " config accordingly as not setting `clip_sample` in the config might lead to incorrect results in" " future versions. If you have downloaded this checkpoint from the Hugging Face Hub, it would be very" " nice if you could open a Pull request for the `scheduler/scheduler_config.json` file" ) deprecate("clip_sample not set", "1.0.0", deprecation_message, standard_warn=False) new_config = dict(scheduler.config) new_config["clip_sample"] = False scheduler._internal_dict = FrozenDict(new_config) if safety_checker is None and requires_safety_checker: logger.warning( f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure" " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered" " results in services or applications open to the public. Both the diffusers team and Hugging Face" " strongly recommend to keep the safety filter enabled in all public facing circumstances, disabling" " it only for use-cases that involve analyzing network behavior or auditing its results. For more" " information, please have a look at https://github.com/huggingface/diffusers/pull/254 ." ) if safety_checker is not None and feature_extractor is None: raise ValueError( "Make sure to define a feature extractor when loading {self.__class__} if you want to use the safety" " checker. If you do not want to use the safety checker, you can pass `'safety_checker=None'` instead." ) is_unet_version_less_0_9_0 = hasattr(unet.config, "_diffusers_version") and version.parse( version.parse(unet.config._diffusers_version).base_version ) < version.parse("0.9.0.dev0") is_unet_sample_size_less_64 = hasattr(unet.config, "sample_size") and unet.config.sample_size < 64 if is_unet_version_less_0_9_0 and is_unet_sample_size_less_64: deprecation_message = ( "The configuration file of the unet has set the default `sample_size` to smaller than" " 64 which seems highly unlikely .If you're checkpoint is a fine-tuned version of any of the" " following: \n- CompVis/stable-diffusion-v1-4 \n- CompVis/stable-diffusion-v1-3 \n-" " CompVis/stable-diffusion-v1-2 \n- CompVis/stable-diffusion-v1-1 \n- runwayml/stable-diffusion-v1-5" " \n- runwayml/stable-diffusion-inpainting \n you should change 'sample_size' to 64 in the" " configuration file. Please make sure to update the config accordingly as leaving `sample_size=32`" " in the config might lead to incorrect results in future versions. If you have downloaded this" " checkpoint from the Hugging Face Hub, it would be very nice if you could open a Pull request for" " the `unet/config.json` file" ) deprecate("sample_size<64", "1.0.0", deprecation_message, standard_warn=False) new_config = dict(unet.config) new_config["sample_size"] = 64 unet._internal_dict = FrozenDict(new_config) self.register_modules( vae=vae, text_encoder=text_encoder, tokenizer=tokenizer, unet=unet, scheduler=scheduler, safety_checker=safety_checker, feature_extractor=feature_extractor, ) self.vae_scale_factor = 2 ** (len(self.vae.config.block_out_channels) - 1) self.register_to_config(requires_safety_checker=requires_safety_checker) def enable_attention_slicing(self, slice_size: Optional[Union[str, int]] = "auto"): r""" Enable sliced attention computation. When this option is enabled, the attention module will split the input tensor in slices, to compute attention in several steps. This is useful to save some memory in exchange for a small speed decrease. Args: slice_size (`str` or `int`, *optional*, defaults to `"auto"`): When `"auto"`, halves the input to the attention heads, so attention will be computed in two steps. If a number is provided, uses as many slices as `attention_head_dim // slice_size`. In this case, `attention_head_dim` must be a multiple of `slice_size`. """ if slice_size == "auto": if isinstance(self.unet.config.attention_head_dim, int): # half the attention head size is usually a good trade-off between # speed and memory slice_size = self.unet.config.attention_head_dim // 2 else: # if `attention_head_dim` is a list, take the smallest head size slice_size = min(self.unet.config.attention_head_dim) self.unet.set_attention_slice(slice_size) def disable_attention_slicing(self): r""" Disable sliced attention computation. If `enable_attention_slicing` was previously invoked, this method will go back to computing attention in one step. """ # set slice_size = `None` to disable `attention slicing` self.enable_attention_slicing(None) @torch.no_grad() def __call__( self, prompt: Optional[Union[str, List[str]]] = None, height: Optional[int] = None, width: Optional[int] = None, num_inference_steps: int = 50, guidance_scale: float = 7.5, negative_prompt: Optional[Union[str, List[str]]] = None, num_images_per_prompt: Optional[int] = 1, eta: float = 0.0, generator: Optional[torch.Generator] = None, latents: Optional[torch.FloatTensor] = None, output_type: Optional[str] = "pil", return_dict: bool = True, callback: Optional[Callable[[int, int, torch.FloatTensor], None]] = None, callback_steps: Optional[int] = 1, text_embeddings: Optional[torch.FloatTensor] = None, **kwargs, ): r""" Function invoked when calling the pipeline for generation. Args: prompt (`str` or `List[str]`, *optional*, defaults to `None`): The prompt or prompts to guide the image generation. If not provided, `text_embeddings` is required. height (`int`, *optional*, defaults to 512): The height in pixels of the generated image. width (`int`, *optional*, defaults to 512): The width in pixels of the generated image. num_inference_steps (`int`, *optional*, defaults to 50): The number of denoising steps. More denoising steps usually lead to a higher quality image at the expense of slower inference. guidance_scale (`float`, *optional*, defaults to 7.5): Guidance scale as defined in [Classifier-Free Diffusion Guidance](https://arxiv.org/abs/2207.12598). `guidance_scale` is defined as `w` of equation 2. of [Imagen Paper](https://arxiv.org/pdf/2205.11487.pdf). Guidance scale is enabled by setting `guidance_scale > 1`. Higher guidance scale encourages to generate images that are closely linked to the text `prompt`, usually at the expense of lower image quality. negative_prompt (`str` or `List[str]`, *optional*): The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored if `guidance_scale` is less than `1`). num_images_per_prompt (`int`, *optional*, defaults to 1): The number of images to generate per prompt. eta (`float`, *optional*, defaults to 0.0): Corresponds to parameter eta (η) in the DDIM paper: https://arxiv.org/abs/2010.02502. Only applies to [`schedulers.DDIMScheduler`], will be ignored for others. generator (`torch.Generator`, *optional*): A [torch generator](https://pytorch.org/docs/stable/generated/torch.Generator.html) to make generation deterministic. latents (`torch.FloatTensor`, *optional*): Pre-generated noisy latents, sampled from a Gaussian distribution, to be used as inputs for image generation. Can be used to tweak the same generation with different prompts. If not provided, a latents tensor will ge generated by sampling using the supplied random `generator`. output_type (`str`, *optional*, defaults to `"pil"`): The output format of the generate image. Choose between [PIL](https://pillow.readthedocs.io/en/stable/): `PIL.Image.Image` or `np.array`. return_dict (`bool`, *optional*, defaults to `True`): Whether or not to return a [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] instead of a plain tuple. callback (`Callable`, *optional*): A function that will be called every `callback_steps` steps during inference. The function will be called with the following arguments: `callback(step: int, timestep: int, latents: torch.FloatTensor)`. callback_steps (`int`, *optional*, defaults to 1): The frequency at which the `callback` function will be called. If not specified, the callback will be called at every step. text_embeddings (`torch.FloatTensor`, *optional*, defaults to `None`): Pre-generated text embeddings to be used as inputs for image generation. Can be used in place of `prompt` to avoid re-computing the embeddings. If not provided, the embeddings will be generated from the supplied `prompt`. Returns: [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] or `tuple`: [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] if `return_dict` is True, otherwise a `tuple. When returning a tuple, the first element is a list with the generated images, and the second element is a list of `bool`s denoting whether the corresponding generated image likely represents "not-safe-for-work" (nsfw) content, according to the `safety_checker`. """ # 0. Default height and width to unet height = height or self.unet.config.sample_size * self.vae_scale_factor width = width or self.unet.config.sample_size * self.vae_scale_factor 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}.") if (callback_steps is None) or ( callback_steps is not None and (not isinstance(callback_steps, int) or callback_steps <= 0) ): raise ValueError( f"`callback_steps` has to be a positive integer but is {callback_steps} of type" f" {type(callback_steps)}." ) if text_embeddings is None: 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)}") # get prompt text embeddings text_inputs = self.tokenizer( prompt, padding="max_length", max_length=self.tokenizer.model_max_length, return_tensors="pt", ) text_input_ids = text_inputs.input_ids if text_input_ids.shape[-1] > self.tokenizer.model_max_length: removed_text = self.tokenizer.batch_decode(text_input_ids[:, self.tokenizer.model_max_length :]) print( "The following part of your input was truncated because CLIP can only handle sequences up to" f" {self.tokenizer.model_max_length} tokens: {removed_text}" ) text_input_ids = text_input_ids[:, : self.tokenizer.model_max_length] text_embeddings = self.text_encoder(text_input_ids.to(self.device))[0] else: batch_size = text_embeddings.shape[0] # duplicate text embeddings for each generation per prompt, using mps friendly method bs_embed, seq_len, _ = text_embeddings.shape text_embeddings = text_embeddings.repeat(1, num_images_per_prompt, 1) text_embeddings = text_embeddings.view(bs_embed * num_images_per_prompt, seq_len, -1) # 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: uncond_tokens: List[str] if negative_prompt is None: uncond_tokens = [""] elif text_embeddings is None and type(prompt) is not type(negative_prompt): raise TypeError( f"`negative_prompt` should be the same type to `prompt`, but got {type(negative_prompt)} !=" f" {type(prompt)}." ) elif isinstance(negative_prompt, str): uncond_tokens = [negative_prompt] elif batch_size != len(negative_prompt): raise ValueError( f"`negative_prompt`: {negative_prompt} has batch size {len(negative_prompt)}, but `prompt`:" f" {prompt} has batch size {batch_size}. Please make sure that passed `negative_prompt` matches" " the batch size of `prompt`." ) else: uncond_tokens = negative_prompt max_length = self.tokenizer.model_max_length uncond_input = self.tokenizer( uncond_tokens, padding="max_length", max_length=max_length, truncation=True, return_tensors="pt", ) uncond_embeddings = self.text_encoder(uncond_input.input_ids.to(self.device))[0] # duplicate unconditional embeddings for each generation per prompt, using mps friendly method seq_len = uncond_embeddings.shape[1] uncond_embeddings = uncond_embeddings.repeat(batch_size, num_images_per_prompt, 1) uncond_embeddings = uncond_embeddings.view(batch_size * num_images_per_prompt, seq_len, -1) # 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.in_channels, height // 8, width // 8, ) latents_dtype = text_embeddings.dtype if latents is None: if self.device.type == "mps": # randn does not exist 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 self.scheduler.set_timesteps(num_inference_steps) # 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 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 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) # compute the previous noisy sample x_t -> x_t-1 latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample # call the callback, if provided if callback is not None and i % callback_steps == 0: callback(i, t, latents) latents = 1 / 0.18215 * latents image = self.vae.decode(latents).sample image = (image / 2 + 0.5).clamp(0, 1) # we always cast to float32 as this does not cause significant overhead and is compatible with bfloa16 image = image.cpu().permute(0, 2, 3, 1).float().numpy() if self.safety_checker is not None: safety_checker_input = self.feature_extractor(self.numpy_to_pil(image), return_tensors="pt").to(self.device) image, has_nsfw_concept = self.safety_checker( images=image, clip_input=safety_checker_input.pixel_values.to(text_embeddings.dtype), ) else: has_nsfw_concept = None if output_type == "pil": image = self.numpy_to_pil(image) if not return_dict: return (image, has_nsfw_concept) return StableDiffusionPipelineOutput(images=image, nsfw_content_detected=has_nsfw_concept) def generate_inputs(self, prompt_a, prompt_b, seed_a, seed_b, noise_shape, T, batch_size): embeds_a = self.embed_text(prompt_a) embeds_b = self.embed_text(prompt_b) latents_dtype = embeds_a.dtype latents_a = self.init_noise(seed_a, noise_shape, latents_dtype) latents_b = self.init_noise(seed_b, noise_shape, latents_dtype) batch_idx = 0 embeds_batch, noise_batch = None, None for i, t in enumerate(T): embeds = torch.lerp(embeds_a, embeds_b, t) noise = slerp(float(t), latents_a, latents_b) embeds_batch = embeds if embeds_batch is None else torch.cat([embeds_batch, embeds]) noise_batch = noise if noise_batch is None else torch.cat([noise_batch, noise]) batch_is_ready = embeds_batch.shape[0] == batch_size or i + 1 == T.shape[0] if not batch_is_ready: continue yield batch_idx, embeds_batch, noise_batch batch_idx += 1 del embeds_batch, noise_batch torch.cuda.empty_cache() embeds_batch, noise_batch = None, None def make_clip_frames( self, prompt_a: str, prompt_b: str, seed_a: int, seed_b: int, num_interpolation_steps: int = 5, save_path: Union[str, Path] = "outputs/", num_inference_steps: int = 50, guidance_scale: float = 7.5, eta: float = 0.0, height: Optional[int] = None, width: Optional[int] = None, upsample: bool = False, batch_size: int = 1, image_file_ext: str = ".png", T: np.ndarray = None, skip: int = 0, negative_prompt: str = None, step: Optional[Tuple[int, int]] = None, ): # 0. Default height and width to unet height = height or self.unet.config.sample_size * self.vae_scale_factor width = width or self.unet.config.sample_size * self.vae_scale_factor save_path = Path(save_path) save_path.mkdir(parents=True, exist_ok=True) T = T if T is not None else np.linspace(0.0, 1.0, num_interpolation_steps) if T.shape[0] != num_interpolation_steps: raise ValueError(f"Unexpected T shape, got {T.shape}, expected dim 0 to be {num_interpolation_steps}") if upsample: if getattr(self, "upsampler", None) is None: self.upsampler = RealESRGANModel.from_pretrained("nateraw/real-esrgan") self.upsampler.to(self.device) batch_generator = self.generate_inputs( prompt_a, prompt_b, seed_a, seed_b, (1, self.unet.in_channels, height // 8, width // 8), T[skip:], batch_size, ) num_batches = math.ceil(num_interpolation_steps / batch_size) log_prefix = "" if step is None else f"[{step[0]}/{step[1]}] " frame_index = skip for batch_idx, embeds_batch, noise_batch in batch_generator: if batch_size == 1: msg = f"Generating frame {frame_index}" else: msg = f"Generating frames {frame_index}-{frame_index+embeds_batch.shape[0]-1}" logger.info(f"{log_prefix}[{batch_idx}/{num_batches}] {msg}") outputs = self( latents=noise_batch, text_embeddings=embeds_batch, height=height, width=width, guidance_scale=guidance_scale, eta=eta, num_inference_steps=num_inference_steps, output_type="pil" if not upsample else "numpy", negative_prompt=negative_prompt, )["images"] for image in outputs: frame_filepath = save_path / (f"frame%06d{image_file_ext}" % frame_index) image = image if not upsample else self.upsampler(image) image.save(frame_filepath) frame_index += 1 def walk( self, prompts: Optional[List[str]] = None, seeds: Optional[List[int]] = None, num_interpolation_steps: Optional[Union[int, List[int]]] = 5, # int or list of int output_dir: Optional[str] = "./dreams", name: Optional[str] = None, image_file_ext: Optional[str] = ".png", fps: Optional[int] = 30, num_inference_steps: Optional[int] = 50, guidance_scale: Optional[float] = 7.5, eta: Optional[float] = 0.0, height: Optional[int] = None, width: Optional[int] = None, upsample: Optional[bool] = False, batch_size: Optional[int] = 1, resume: Optional[bool] = False, audio_filepath: str = None, audio_start_sec: Optional[Union[int, float]] = None, margin: Optional[float] = 1.0, smooth: Optional[float] = 0.0, negative_prompt: Optional[str] = None, make_video: Optional[bool] = True, ): """Generate a video from a sequence of prompts and seeds. Optionally, add audio to the video to interpolate to the intensity of the audio. Args: prompts (Optional[List[str]], optional): list of text prompts. Defaults to None. seeds (Optional[List[int]], optional): list of random seeds corresponding to prompts. Defaults to None. num_interpolation_steps (Union[int, List[int]], *optional*): How many interpolation steps between each prompt. Defaults to None. output_dir (Optional[str], optional): Where to save the video. Defaults to './dreams'. name (Optional[str], optional): Name of the subdirectory of output_dir. Defaults to None. image_file_ext (Optional[str], *optional*, defaults to '.png'): The extension to use when writing video frames. fps (Optional[int], *optional*, defaults to 30): The frames per second in the resulting output videos. num_inference_steps (Optional[int], *optional*, defaults to 50): The number of denoising steps. More denoising steps usually lead to a higher quality image at the expense of slower inference. guidance_scale (Optional[float], *optional*, defaults to 7.5): Guidance scale as defined in [Classifier-Free Diffusion Guidance](https://arxiv.org/abs/2207.12598). `guidance_scale` is defined as `w` of equation 2. of [Imagen Paper](https://arxiv.org/pdf/2205.11487.pdf). Guidance scale is enabled by setting `guidance_scale > 1`. Higher guidance scale encourages to generate images that are closely linked to the text `prompt`, usually at the expense of lower image quality. eta (Optional[float], *optional*, defaults to 0.0): Corresponds to parameter eta (η) in the DDIM paper: https://arxiv.org/abs/2010.02502. Only applies to [`schedulers.DDIMScheduler`], will be ignored for others. height (Optional[int], *optional*, defaults to None): height of the images to generate. width (Optional[int], *optional*, defaults to None): width of the images to generate. upsample (Optional[bool], *optional*, defaults to False): When True, upsamples images with realesrgan. batch_size (Optional[int], *optional*, defaults to 1): Number of images to generate at once. resume (Optional[bool], *optional*, defaults to False): When True, resumes from the last frame in the output directory based on available prompt config. Requires you to provide the `name` argument. audio_filepath (str, *optional*, defaults to None): Optional path to an audio file to influence the interpolation rate. audio_start_sec (Optional[Union[int, float]], *optional*, defaults to 0): Global start time of the provided audio_filepath. margin (Optional[float], *optional*, defaults to 1.0): Margin from librosa hpss to use for audio interpolation. smooth (Optional[float], *optional*, defaults to 0.0): Smoothness of the audio interpolation. 1.0 means linear interpolation. negative_prompt (Optional[str], *optional*, defaults to None): Optional negative prompt to use. Same across all prompts. make_video (Optional[bool], *optional*, defaults to True): When True, makes a video from the generated frames. If False, only generates the frames. This function will create sub directories for each prompt and seed pair. For example, if you provide the following prompts and seeds: ``` prompts = ['a dog', 'a cat', 'a bird'] seeds = [1, 2, 3] num_interpolation_steps = 5 output_dir = 'output_dir' name = 'name' fps = 5 ``` Then the following directories will be created: ``` output_dir ├── name │ ├── name_000000 │ │ ├── frame000000.png │ │ ├── ... │ │ ├── frame000004.png │ │ ├── name_000000.mp4 │ ├── name_000001 │ │ ├── frame000000.png │ │ ├── ... │ │ ├── frame000004.png │ │ ├── name_000001.mp4 │ ├── ... │ ├── name.mp4 | |── prompt_config.json ``` Returns: str: The resulting video filepath. This video includes all sub directories' video clips. """ # 0. Default height and width to unet height = height or self.unet.config.sample_size * self.vae_scale_factor width = width or self.unet.config.sample_size * self.vae_scale_factor output_path = Path(output_dir) name = name or time.strftime("%Y%m%d-%H%M%S") save_path_root = output_path / name save_path_root.mkdir(parents=True, exist_ok=True) # Where the final video of all the clips combined will be saved output_filepath = save_path_root / f"{name}.mp4" # If using same number of interpolation steps between, we turn into list if not resume and isinstance(num_interpolation_steps, int): num_interpolation_steps = [num_interpolation_steps] * (len(prompts) - 1) if not resume: audio_start_sec = audio_start_sec or 0 # Save/reload prompt config prompt_config_path = save_path_root / "prompt_config.json" if not resume: prompt_config_path.write_text( json.dumps( dict( prompts=prompts, seeds=seeds, num_interpolation_steps=num_interpolation_steps, fps=fps, num_inference_steps=num_inference_steps, guidance_scale=guidance_scale, eta=eta, upsample=upsample, height=height, width=width, audio_filepath=audio_filepath, audio_start_sec=audio_start_sec, negative_prompt=negative_prompt, ), indent=2, sort_keys=False, ) ) else: data = json.load(open(prompt_config_path)) prompts = data["prompts"] seeds = data["seeds"] num_interpolation_steps = data["num_interpolation_steps"] fps = data["fps"] num_inference_steps = data["num_inference_steps"] guidance_scale = data["guidance_scale"] eta = data["eta"] upsample = data["upsample"] height = data["height"] width = data["width"] audio_filepath = data["audio_filepath"] audio_start_sec = data["audio_start_sec"] negative_prompt = data.get("negative_prompt", None) for i, (prompt_a, prompt_b, seed_a, seed_b, num_step) in enumerate( zip(prompts, prompts[1:], seeds, seeds[1:], num_interpolation_steps) ): # {name}_000000 / {name}_000001 / ... save_path = save_path_root / f"{name}_{i:06d}" # Where the individual clips will be saved step_output_filepath = save_path / f"{name}_{i:06d}.mp4" # Determine if we need to resume from a previous run skip = 0 if resume: if step_output_filepath.exists(): print(f"Skipping {save_path} because frames already exist") continue existing_frames = sorted(save_path.glob(f"*{image_file_ext}")) if existing_frames: skip = int(existing_frames[-1].stem[-6:]) + 1 if skip + 1 >= num_step: print(f"Skipping {save_path} because frames already exist") continue print(f"Resuming {save_path.name} from frame {skip}") audio_offset = audio_start_sec + sum(num_interpolation_steps[:i]) / fps audio_duration = num_step / fps self.make_clip_frames( prompt_a, prompt_b, seed_a, seed_b, num_interpolation_steps=num_step, save_path=save_path, num_inference_steps=num_inference_steps, guidance_scale=guidance_scale, eta=eta, height=height, width=width, upsample=upsample, batch_size=batch_size, T=get_timesteps_arr( audio_filepath, offset=audio_offset, duration=audio_duration, fps=fps, margin=margin, smooth=smooth, ) if audio_filepath else None, skip=skip, negative_prompt=negative_prompt, step=(i, len(prompts) - 1), ) if make_video: make_video_pyav( save_path, audio_filepath=audio_filepath, fps=fps, output_filepath=step_output_filepath, glob_pattern=f"*{image_file_ext}", audio_offset=audio_offset, audio_duration=audio_duration, sr=44100, ) if make_video: return make_video_pyav( save_path_root, audio_filepath=audio_filepath, fps=fps, audio_offset=audio_start_sec, audio_duration=sum(num_interpolation_steps) / fps, output_filepath=output_filepath, glob_pattern=f"**/*{image_file_ext}", sr=44100, ) def embed_text(self, text, negative_prompt=None): """Helper to embed some text""" text_input = self.tokenizer( text, padding="max_length", max_length=self.tokenizer.model_max_length, truncation=True, return_tensors="pt", ) with torch.no_grad(): embed = self.text_encoder(text_input.input_ids.to(self.device))[0] return embed def init_noise(self, seed, noise_shape, dtype): """Helper to initialize noise""" # randn does not exist on mps, so we create noise on CPU here and move it to the device after initialization if self.device.type == "mps": noise = torch.randn( noise_shape, device="cpu", generator=torch.Generator(device="cpu").manual_seed(seed), ).to(self.device) else: noise = torch.randn( noise_shape, device=self.device, generator=torch.Generator(device=self.device).manual_seed(seed), dtype=dtype, ) return noise @classmethod def from_pretrained(cls, *args, tiled=False, **kwargs): """Same as diffusers `from_pretrained` but with tiled option, which makes images tilable""" if tiled: def patch_conv(**patch): cls = nn.Conv2d init = cls.__init__ def __init__(self, *args, **kwargs): return init(self, *args, **kwargs, **patch) cls.__init__ = __init__ patch_conv(padding_mode="circular") pipeline = super().from_pretrained(*args, **kwargs) pipeline.tiled = tiled return pipeline