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| import yaml | |
| import random | |
| import inspect | |
| import numpy as np | |
| from tqdm import tqdm | |
| import torch | |
| import torch.nn as nn | |
| import torch.nn.functional as F | |
| from einops import repeat | |
| from tools.torch_tools import wav_to_fbank | |
| from audioldm.audio.stft import TacotronSTFT | |
| from audioldm.variational_autoencoder import AutoencoderKL | |
| from audioldm.utils import default_audioldm_config, get_metadata | |
| from transformers import CLIPTokenizer, AutoTokenizer | |
| from transformers import CLIPTextModel, T5EncoderModel, AutoModel | |
| import sys | |
| sys.path.insert(0, "diffusers/src") | |
| import diffusers | |
| from diffusers.utils import randn_tensor | |
| from diffusers import DDPMScheduler, UNet2DConditionModel | |
| from diffusers import AutoencoderKL as DiffuserAutoencoderKL | |
| def build_pretrained_models(name): | |
| checkpoint = torch.load(get_metadata()[name]["path"], map_location="cpu") | |
| scale_factor = checkpoint["state_dict"]["scale_factor"].item() | |
| vae_state_dict = {k[18:]: v for k, v in checkpoint["state_dict"].items() if "first_stage_model." in k} | |
| config = default_audioldm_config(name) | |
| vae_config = config["model"]["params"]["first_stage_config"]["params"] | |
| vae_config["scale_factor"] = scale_factor | |
| vae = AutoencoderKL(**vae_config) | |
| vae.load_state_dict(vae_state_dict) | |
| fn_STFT = TacotronSTFT( | |
| config["preprocessing"]["stft"]["filter_length"], | |
| config["preprocessing"]["stft"]["hop_length"], | |
| config["preprocessing"]["stft"]["win_length"], | |
| config["preprocessing"]["mel"]["n_mel_channels"], | |
| config["preprocessing"]["audio"]["sampling_rate"], | |
| config["preprocessing"]["mel"]["mel_fmin"], | |
| config["preprocessing"]["mel"]["mel_fmax"], | |
| ) | |
| vae.eval() | |
| fn_STFT.eval() | |
| return vae, fn_STFT | |
| class AudioDiffusion(nn.Module): | |
| def __init__( | |
| self, | |
| text_encoder_name, | |
| scheduler_name, | |
| unet_model_name=None, | |
| unet_model_config_path=None, | |
| snr_gamma=None, | |
| freeze_text_encoder=True, | |
| uncondition=False, | |
| ): | |
| super().__init__() | |
| assert unet_model_name is not None or unet_model_config_path is not None, "Either UNet pretrain model name or a config file path is required" | |
| self.text_encoder_name = text_encoder_name | |
| self.scheduler_name = scheduler_name | |
| self.unet_model_name = unet_model_name | |
| self.unet_model_config_path = unet_model_config_path | |
| self.snr_gamma = snr_gamma | |
| self.freeze_text_encoder = freeze_text_encoder | |
| self.uncondition = uncondition | |
| # https://huggingface.co/docs/diffusers/v0.14.0/en/api/schedulers/overview | |
| self.noise_scheduler = DDPMScheduler.from_pretrained(self.scheduler_name, subfolder="scheduler") | |
| self.inference_scheduler = DDPMScheduler.from_pretrained(self.scheduler_name, subfolder="scheduler") | |
| if unet_model_config_path: | |
| unet_config = UNet2DConditionModel.load_config(unet_model_config_path) | |
| self.unet = UNet2DConditionModel.from_config(unet_config, subfolder="unet") | |
| self.set_from = "random" | |
| print("UNet initialized randomly.") | |
| else: | |
| self.unet = UNet2DConditionModel.from_pretrained(unet_model_name, subfolder="unet") | |
| self.set_from = "pre-trained" | |
| self.group_in = nn.Sequential(nn.Linear(8, 512), nn.Linear(512, 4)) | |
| self.group_out = nn.Sequential(nn.Linear(4, 512), nn.Linear(512, 8)) | |
| print("UNet initialized from stable diffusion checkpoint.") | |
| if "stable-diffusion" in self.text_encoder_name: | |
| self.tokenizer = CLIPTokenizer.from_pretrained(self.text_encoder_name, subfolder="tokenizer") | |
| self.text_encoder = CLIPTextModel.from_pretrained(self.text_encoder_name, subfolder="text_encoder") | |
| elif "t5" in self.text_encoder_name: | |
| self.tokenizer = AutoTokenizer.from_pretrained(self.text_encoder_name) | |
| self.text_encoder = T5EncoderModel.from_pretrained(self.text_encoder_name) | |
| else: | |
| self.tokenizer = AutoTokenizer.from_pretrained(self.text_encoder_name) | |
| self.text_encoder = AutoModel.from_pretrained(self.text_encoder_name) | |
| def compute_snr(self, timesteps): | |
| """ | |
| Computes SNR as per https://github.com/TiankaiHang/Min-SNR-Diffusion-Training/blob/521b624bd70c67cee4bdf49225915f5945a872e3/guided_diffusion/gaussian_diffusion.py#L847-L849 | |
| """ | |
| alphas_cumprod = self.noise_scheduler.alphas_cumprod | |
| sqrt_alphas_cumprod = alphas_cumprod**0.5 | |
| sqrt_one_minus_alphas_cumprod = (1.0 - alphas_cumprod) ** 0.5 | |
| # Expand the tensors. | |
| # Adapted from https://github.com/TiankaiHang/Min-SNR-Diffusion-Training/blob/521b624bd70c67cee4bdf49225915f5945a872e3/guided_diffusion/gaussian_diffusion.py#L1026 | |
| sqrt_alphas_cumprod = sqrt_alphas_cumprod.to(device=timesteps.device)[timesteps].float() | |
| while len(sqrt_alphas_cumprod.shape) < len(timesteps.shape): | |
| sqrt_alphas_cumprod = sqrt_alphas_cumprod[..., None] | |
| alpha = sqrt_alphas_cumprod.expand(timesteps.shape) | |
| sqrt_one_minus_alphas_cumprod = sqrt_one_minus_alphas_cumprod.to(device=timesteps.device)[timesteps].float() | |
| while len(sqrt_one_minus_alphas_cumprod.shape) < len(timesteps.shape): | |
| sqrt_one_minus_alphas_cumprod = sqrt_one_minus_alphas_cumprod[..., None] | |
| sigma = sqrt_one_minus_alphas_cumprod.expand(timesteps.shape) | |
| # Compute SNR. | |
| snr = (alpha / sigma) ** 2 | |
| return snr | |
| def encode_text(self, prompt): | |
| device = self.text_encoder.device | |
| batch = self.tokenizer( | |
| prompt, max_length=self.tokenizer.model_max_length, padding=True, truncation=True, return_tensors="pt" | |
| ) | |
| input_ids, attention_mask = batch.input_ids.to(device), batch.attention_mask.to(device) | |
| if self.freeze_text_encoder: | |
| with torch.no_grad(): | |
| encoder_hidden_states = self.text_encoder( | |
| input_ids=input_ids, attention_mask=attention_mask | |
| )[0] | |
| else: | |
| encoder_hidden_states = self.text_encoder( | |
| input_ids=input_ids, attention_mask=attention_mask | |
| )[0] | |
| boolean_encoder_mask = (attention_mask == 1).to(device) | |
| return encoder_hidden_states, boolean_encoder_mask | |
| def forward(self, latents, prompt): | |
| device = self.text_encoder.device | |
| num_train_timesteps = self.noise_scheduler.num_train_timesteps | |
| self.noise_scheduler.set_timesteps(num_train_timesteps, device=device) | |
| encoder_hidden_states, boolean_encoder_mask = self.encode_text(prompt) | |
| if self.uncondition: | |
| mask_indices = [k for k in range(len(prompt)) if random.random() < 0.1] | |
| if len(mask_indices) > 0: | |
| encoder_hidden_states[mask_indices] = 0 | |
| bsz = latents.shape[0] | |
| # Sample a random timestep for each instance | |
| timesteps = torch.randint(0, self.noise_scheduler.num_train_timesteps, (bsz,), device=device) | |
| timesteps = timesteps.long() | |
| noise = torch.randn_like(latents) | |
| noisy_latents = self.noise_scheduler.add_noise(latents, noise, timesteps) | |
| # Get the target for loss depending on the prediction type | |
| if self.noise_scheduler.config.prediction_type == "epsilon": | |
| target = noise | |
| elif self.noise_scheduler.config.prediction_type == "v_prediction": | |
| target = self.noise_scheduler.get_velocity(latents, noise, timesteps) | |
| else: | |
| raise ValueError(f"Unknown prediction type {self.noise_scheduler.config.prediction_type}") | |
| if self.set_from == "random": | |
| model_pred = self.unet( | |
| noisy_latents, timesteps, encoder_hidden_states, | |
| encoder_attention_mask=boolean_encoder_mask | |
| ).sample | |
| elif self.set_from == "pre-trained": | |
| compressed_latents = self.group_in(noisy_latents.permute(0, 2, 3, 1).contiguous()).permute(0, 3, 1, 2).contiguous() | |
| model_pred = self.unet( | |
| compressed_latents, timesteps, encoder_hidden_states, | |
| encoder_attention_mask=boolean_encoder_mask | |
| ).sample | |
| model_pred = self.group_out(model_pred.permute(0, 2, 3, 1).contiguous()).permute(0, 3, 1, 2).contiguous() | |
| if self.snr_gamma is None: | |
| loss = F.mse_loss(model_pred.float(), target.float(), reduction="mean") | |
| else: | |
| # Compute loss-weights as per Section 3.4 of https://arxiv.org/abs/2303.09556. | |
| # Adaptef from huggingface/diffusers/blob/main/examples/text_to_image/train_text_to_image.py | |
| snr = self.compute_snr(timesteps) | |
| mse_loss_weights = ( | |
| torch.stack([snr, self.snr_gamma * torch.ones_like(timesteps)], dim=1).min(dim=1)[0] / snr | |
| ) | |
| loss = F.mse_loss(model_pred.float(), target.float(), reduction="none") | |
| loss = loss.mean(dim=list(range(1, len(loss.shape)))) * mse_loss_weights | |
| loss = loss.mean() | |
| return loss | |
| def inference(self, prompt, inference_scheduler, num_steps=20, guidance_scale=3, num_samples_per_prompt=1, | |
| disable_progress=True): | |
| device = self.text_encoder.device | |
| classifier_free_guidance = guidance_scale > 1.0 | |
| batch_size = len(prompt) * num_samples_per_prompt | |
| if classifier_free_guidance: | |
| prompt_embeds, boolean_prompt_mask = self.encode_text_classifier_free(prompt, num_samples_per_prompt) | |
| else: | |
| prompt_embeds, boolean_prompt_mask = self.encode_text(prompt) | |
| prompt_embeds = prompt_embeds.repeat_interleave(num_samples_per_prompt, 0) | |
| boolean_prompt_mask = boolean_prompt_mask.repeat_interleave(num_samples_per_prompt, 0) | |
| inference_scheduler.set_timesteps(num_steps, device=device) | |
| timesteps = inference_scheduler.timesteps | |
| num_channels_latents = self.unet.in_channels | |
| latents = self.prepare_latents(batch_size, inference_scheduler, num_channels_latents, prompt_embeds.dtype, device) | |
| num_warmup_steps = len(timesteps) - num_steps * inference_scheduler.order | |
| progress_bar = tqdm(range(num_steps), disable=disable_progress) | |
| for i, t in enumerate(timesteps): | |
| # expand the latents if we are doing classifier free guidance | |
| latent_model_input = torch.cat([latents] * 2) if classifier_free_guidance else latents | |
| latent_model_input = inference_scheduler.scale_model_input(latent_model_input, t) | |
| noise_pred = self.unet( | |
| latent_model_input, t, encoder_hidden_states=prompt_embeds, | |
| encoder_attention_mask=boolean_prompt_mask | |
| ).sample | |
| # perform guidance | |
| if 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 = inference_scheduler.step(noise_pred, t, latents).prev_sample | |
| # call the callback, if provided | |
| if i == len(timesteps) - 1 or ((i + 1) > num_warmup_steps and (i + 1) % inference_scheduler.order == 0): | |
| progress_bar.update(1) | |
| if self.set_from == "pre-trained": | |
| latents = self.group_out(latents.permute(0, 2, 3, 1).contiguous()).permute(0, 3, 1, 2).contiguous() | |
| return latents | |
| def prepare_latents(self, batch_size, inference_scheduler, num_channels_latents, dtype, device): | |
| shape = (batch_size, num_channels_latents, 256, 16) | |
| latents = randn_tensor(shape, generator=None, device=device, dtype=dtype) | |
| # scale the initial noise by the standard deviation required by the scheduler | |
| latents = latents * inference_scheduler.init_noise_sigma | |
| return latents | |
| def encode_text_classifier_free(self, prompt, num_samples_per_prompt): | |
| device = self.text_encoder.device | |
| batch = self.tokenizer( | |
| prompt, max_length=self.tokenizer.model_max_length, padding=True, truncation=True, return_tensors="pt" | |
| ) | |
| input_ids, attention_mask = batch.input_ids.to(device), batch.attention_mask.to(device) | |
| with torch.no_grad(): | |
| prompt_embeds = self.text_encoder( | |
| input_ids=input_ids, attention_mask=attention_mask | |
| )[0] | |
| prompt_embeds = prompt_embeds.repeat_interleave(num_samples_per_prompt, 0) | |
| attention_mask = attention_mask.repeat_interleave(num_samples_per_prompt, 0) | |
| # get unconditional embeddings for classifier free guidance | |
| uncond_tokens = [""] * len(prompt) | |
| max_length = prompt_embeds.shape[1] | |
| uncond_batch = self.tokenizer( | |
| uncond_tokens, max_length=max_length, padding="max_length", truncation=True, return_tensors="pt", | |
| ) | |
| uncond_input_ids = uncond_batch.input_ids.to(device) | |
| uncond_attention_mask = uncond_batch.attention_mask.to(device) | |
| with torch.no_grad(): | |
| negative_prompt_embeds = self.text_encoder( | |
| input_ids=uncond_input_ids, attention_mask=uncond_attention_mask | |
| )[0] | |
| negative_prompt_embeds = negative_prompt_embeds.repeat_interleave(num_samples_per_prompt, 0) | |
| uncond_attention_mask = uncond_attention_mask.repeat_interleave(num_samples_per_prompt, 0) | |
| # For classifier free guidance, we need to do two forward passes. | |
| # We concatenate the unconditional and text embeddings into a single batch to avoid doing two forward passes | |
| prompt_embeds = torch.cat([negative_prompt_embeds, prompt_embeds]) | |
| prompt_mask = torch.cat([uncond_attention_mask, attention_mask]) | |
| boolean_prompt_mask = (prompt_mask == 1).to(device) | |
| return prompt_embeds, boolean_prompt_mask |