132 lines
6.8 KiB
Python
132 lines
6.8 KiB
Python
import os
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import os.path as osp
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import torch
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import torchaudio
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import torchvision
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from pytorch_fid import fid_score
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from pytorch_fid.fid_score import calculate_frechet_distance
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from torch import distributed
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from tqdm import tqdm
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from transformers import Wav2Vec2ForCTC, Wav2Vec2Processor
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import torch.nn.functional as F
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import numpy as np
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import trainer.eval.evaluator as evaluator
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from data.audio.paired_voice_audio_dataset import load_tsv_aligned_codes
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from data.audio.unsupervised_audio_dataset import load_audio
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from models.clip.mel_text_clip import MelTextCLIP
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from scripts.audio.gen.speech_synthesis_utils import load_discrete_vocoder_diffuser, wav_to_mel
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from utils.util import ceil_multiple, opt_get
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class AudioDiffusionFid(evaluator.Evaluator):
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"""
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Evaluator produces generate from a diffusion model, then uses a pretrained wav2vec model to compute a frechet
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distance between real and fake samples.
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"""
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def __init__(self, model, opt_eval, env):
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super().__init__(model, opt_eval, env, uses_all_ddp=True)
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self.real_path = opt_eval['eval_tsv']
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self.data = load_tsv_aligned_codes(self.real_path)
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if distributed.is_initialized() and distributed.get_world_size() > 1:
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self.skip = distributed.get_world_size() # One batch element per GPU.
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else:
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self.skip = 1
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diffusion_steps = opt_get(opt_eval, ['diffusion_steps'], 50)
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diffusion_schedule = opt_get(env['opt'], ['steps', 'generator', 'injectors', 'diffusion', 'beta_schedule', 'schedule_name'], None)
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if diffusion_schedule is None:
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print("Unable to infer diffusion schedule from master options. Getting it from eval (or guessing).")
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diffusion_schedule = opt_get(opt_eval, ['diffusion_schedule'], 'cosine')
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self.diffuser = load_discrete_vocoder_diffuser(desired_diffusion_steps=diffusion_steps, schedule=diffusion_schedule)
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self.dev = self.env['device']
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def perform_diffusion(self, audio, codes, sample_rate=5500):
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real_resampled = torchaudio.functional.resample(audio, 22050, sample_rate).unsqueeze(0)
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aligned_codes_compression_factor = sample_rate * 221 // 11025
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output_size = codes.shape[-1]*aligned_codes_compression_factor
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padded_size = ceil_multiple(output_size, 2048)
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padding_added = padded_size - output_size
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padding_needed_for_codes = padding_added // aligned_codes_compression_factor
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if padding_needed_for_codes > 0:
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codes = F.pad(codes, (0, padding_needed_for_codes))
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output_shape = (1, 1, padded_size)
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gen = self.diffuser.p_sample_loop(self.model, output_shape,
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model_kwargs={'tokens': codes.unsqueeze(0),
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'conditioning_input': real_resampled})
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return gen, real_resampled, sample_rate
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def load_projector(self):
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"""
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Builds the CLIP model used to project speech into a latent. This model has fixed parameters and a fixed loading
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path for the time being.
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"""
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model = MelTextCLIP(dim_text=512, dim_latent=512, dim_speech=512, num_text_tokens=148, text_enc_depth=8,
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text_seq_len=400, text_heads=8, speech_enc_depth=10, speech_heads=8, speech_seq_len=1000,
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text_mask_percentage=.15, voice_mask_percentage=.15)
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weights = torch.load('../experiments/clip_text_to_voice_for_speech_fid.pth')
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model.load_state_dict(weights)
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return model
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def project(self, projector, sample, sample_rate):
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sample = torchaudio.resample(sample, sample_rate, 22050)
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mel = wav_to_mel(sample)
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return projector.get_speech_projection(mel).squeeze(0) # Getting rid of the batch dimension means it's just [hidden_dim]
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def compute_frechet_distance(self, proj1, proj2):
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# I really REALLY FUCKING HATE that this is going to numpy. Why does "pytorch_fid" operate in numpy land. WHY?
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proj1 = proj1.cpu().numpy()
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proj2 = proj2.cpu().numpy()
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mu1 = np.mean(proj1, axis=0)
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mu2 = np.mean(proj2, axis=0)
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sigma1 = np.cov(proj1, rowvar=False)
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sigma2 = np.cov(proj2, rowvar=False)
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return torch.tensor(calculate_frechet_distance(mu1, sigma1, mu2, sigma2))
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def perform_eval(self):
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save_path = osp.join(self.env['base_path'], "../", "audio_eval", str(self.env["step"]))
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os.makedirs(save_path, exist_ok=True)
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projector = self.load_projector().to(self.env['device'])
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projector.eval()
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# Attempt to fix the random state as much as possible. RNG state will be restored before returning.
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rng_state = torch.get_rng_state()
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torch.manual_seed(5)
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self.model.eval()
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with torch.no_grad():
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gen_projections = []
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real_projections = []
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for i in tqdm(list(range(0, len(self.data), self.skip))):
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path, text, codes = self.data[i + self.env['rank']]
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audio = load_audio(path, 22050).to(self.dev)
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codes = codes.to(self.dev)
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sample, ref, sample_rate = self.perform_diffusion(audio, codes)
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gen_projections.append(self.project(projector, sample).cpu(), sample_rate) # Store on CPU to avoid wasting GPU memory.
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real_projections.append(self.project(projector, ref).cpu(), sample_rate)
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torchaudio.save(os.path.join(save_path, f"{self.env['rank']}_{i}_gen.wav"), sample.squeeze(0).cpu(), sample_rate)
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torchaudio.save(os.path.join(save_path, f"{self.env['rank']}_{i}_real.wav"), ref.squeeze(0).cpu(), sample_rate)
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gen_projections = torch.stack(gen_projections, dim=0)
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real_projections = torch.stack(real_projections, dim=0)
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frechet_distance = self.compute_frechet_distance(gen_projections, real_projections)
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if distributed.is_initialized() and distributed.get_world_size() > 1:
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frechet_distance = distributed.all_reduce(frechet_distance) / distributed.get_world_size()
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self.model.train()
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torch.set_rng_state(rng_state)
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return {"frechet_distance": frechet_distance}
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if __name__ == '__main__':
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from utils.util import load_model_from_config
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diffusion = load_model_from_config('X:\\dlas\\experiments\\sweep_diffusion_tts6\\baseline\\train_diffusion_tts6.yml', 'generator',
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also_load_savepoint=False, load_path='X:\\dlas\\experiments\\sweep_diffusion_tts6\\baseline\\models\\102000_generator_ema.pth').cuda()
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opt_eval = {'eval_tsv': 'Y:\\libritts\\test-clean\\transcribed-brief-w2v.tsv', 'diffusion_steps': 50, 'diffusion_schedule': 'linear'}
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env = {'rank': 0, 'base_path': 'D:\\tmp\\test_eval', 'step': 500, 'device': 'cuda', 'opt': {}}
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eval = AudioDiffusionFid(diffusion, opt_eval, env)
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eval.perform_eval() |