forked from mrq/tortoise-tts
354 lines
20 KiB
Python
354 lines
20 KiB
Python
import argparse
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import os
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import random
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from urllib import request
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import torch
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import torch.nn.functional as F
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import progressbar
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import torchaudio
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from models.cvvp import CVVP
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from models.diffusion_decoder import DiffusionTts
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from models.autoregressive import UnifiedVoice
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from tqdm import tqdm
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from models.arch_util import TorchMelSpectrogram
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from models.clvp import CLVP
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from models.vocoder import UnivNetGenerator
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from utils.audio import load_audio, wav_to_univnet_mel, denormalize_tacotron_mel
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from utils.diffusion import SpacedDiffusion, space_timesteps, get_named_beta_schedule
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from utils.tokenizer import VoiceBpeTokenizer, lev_distance
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pbar = None
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def download_models():
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"""
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Call to download all the models that Tortoise uses.
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"""
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MODELS = {
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'autoregressive.pth': 'https://huggingface.co/jbetker/tortoise-tts-v2/resolve/hf/.models/autoregressive.pth',
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'clvp.pth': 'https://huggingface.co/jbetker/tortoise-tts-v2/resolve/hf/.models/clvp.pth',
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'cvvp.pth': 'https://huggingface.co/jbetker/tortoise-tts-v2/resolve/hf/.models/cvvp.pth',
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'diffusion_decoder.pth': 'https://huggingface.co/jbetker/tortoise-tts-v2/resolve/hf/.models/diffusion_decoder.pth',
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'vocoder.pth': 'https://huggingface.co/jbetker/tortoise-tts-v2/resolve/hf/.models/vocoder.pth',
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}
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os.makedirs('.models', exist_ok=True)
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def show_progress(block_num, block_size, total_size):
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global pbar
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if pbar is None:
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pbar = progressbar.ProgressBar(maxval=total_size)
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pbar.start()
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downloaded = block_num * block_size
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if downloaded < total_size:
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pbar.update(downloaded)
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else:
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pbar.finish()
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pbar = None
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for model_name, url in MODELS.items():
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if os.path.exists(f'.models/{model_name}'):
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continue
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print(f'Downloading {model_name} from {url}...')
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request.urlretrieve(url, f'.models/{model_name}', show_progress)
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print('Done.')
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def pad_or_truncate(t, length):
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"""
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Utility function for forcing <t> to have the specified sequence length, whether by clipping it or padding it with 0s.
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"""
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if t.shape[-1] == length:
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return t
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elif t.shape[-1] < length:
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return F.pad(t, (0, length-t.shape[-1]))
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else:
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return t[..., :length]
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def load_discrete_vocoder_diffuser(trained_diffusion_steps=4000, desired_diffusion_steps=200, cond_free=True, cond_free_k=1):
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"""
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Helper function to load a GaussianDiffusion instance configured for use as a vocoder.
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"""
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return SpacedDiffusion(use_timesteps=space_timesteps(trained_diffusion_steps, [desired_diffusion_steps]), model_mean_type='epsilon',
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model_var_type='learned_range', loss_type='mse', betas=get_named_beta_schedule('linear', trained_diffusion_steps),
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conditioning_free=cond_free, conditioning_free_k=cond_free_k)
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def format_conditioning(clip, cond_length=132300):
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"""
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Converts the given conditioning signal to a MEL spectrogram and clips it as expected by the models.
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"""
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gap = clip.shape[-1] - cond_length
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if gap < 0:
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clip = F.pad(clip, pad=(0, abs(gap)))
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elif gap > 0:
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rand_start = random.randint(0, gap)
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clip = clip[:, rand_start:rand_start + cond_length]
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mel_clip = TorchMelSpectrogram()(clip.unsqueeze(0)).squeeze(0)
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return mel_clip.unsqueeze(0).cuda()
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def fix_autoregressive_output(codes, stop_token, complain=True):
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"""
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This function performs some padding on coded audio that fixes a mismatch issue between what the diffusion model was
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trained on and what the autoregressive code generator creates (which has no padding or end).
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This is highly specific to the DVAE being used, so this particular coding will not necessarily work if used with
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a different DVAE. This can be inferred by feeding a audio clip padded with lots of zeros on the end through the DVAE
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and copying out the last few codes.
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Failing to do this padding will produce speech with a harsh end that sounds like "BLAH" or similar.
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"""
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# Strip off the autoregressive stop token and add padding.
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stop_token_indices = (codes == stop_token).nonzero()
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if len(stop_token_indices) == 0:
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if complain:
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print("No stop tokens found, enjoy that output of yours!")
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return codes
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else:
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codes[stop_token_indices] = 83
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stm = stop_token_indices.min().item()
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codes[stm:] = 83
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if stm - 3 < codes.shape[0]:
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codes[-3] = 45
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codes[-2] = 45
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codes[-1] = 248
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return codes
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def do_spectrogram_diffusion(diffusion_model, diffuser, latents, conditioning_samples, temperature=1, verbose=True):
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"""
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Uses the specified diffusion model to convert discrete codes into a spectrogram.
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"""
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with torch.no_grad():
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cond_mels = []
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for sample in conditioning_samples:
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# The diffuser operates at a sample rate of 24000 (except for the latent inputs)
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sample = torchaudio.functional.resample(sample, 22050, 24000)
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sample = pad_or_truncate(sample, 102400)
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cond_mel = wav_to_univnet_mel(sample.to(latents.device), do_normalization=False)
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cond_mels.append(cond_mel)
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cond_mels = torch.stack(cond_mels, dim=1)
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output_seq_len = latents.shape[1] * 4 * 24000 // 22050 # This diffusion model converts from 22kHz spectrogram codes to a 24kHz spectrogram signal.
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output_shape = (latents.shape[0], 100, output_seq_len)
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precomputed_embeddings = diffusion_model.timestep_independent(latents, cond_mels, output_seq_len, False)
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noise = torch.randn(output_shape, device=latents.device) * temperature
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mel = diffuser.p_sample_loop(diffusion_model, output_shape, noise=noise,
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model_kwargs={'precomputed_aligned_embeddings': precomputed_embeddings},
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progress=verbose)
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return denormalize_tacotron_mel(mel)[:,:,:output_seq_len]
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class TextToSpeech:
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"""
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Main entry point into Tortoise.
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:param autoregressive_batch_size: Specifies how many samples to generate per batch. Lower this if you are seeing
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GPU OOM errors. Larger numbers generates slightly faster.
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"""
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def __init__(self, autoregressive_batch_size=16):
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self.autoregressive_batch_size = autoregressive_batch_size
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self.tokenizer = VoiceBpeTokenizer()
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download_models()
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self.autoregressive = UnifiedVoice(max_mel_tokens=604, max_text_tokens=402, max_conditioning_inputs=2, layers=30,
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model_dim=1024,
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heads=16, number_text_tokens=255, start_text_token=255, checkpointing=False,
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train_solo_embeddings=False,
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average_conditioning_embeddings=True).cpu().eval()
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self.autoregressive.load_state_dict(torch.load('.models/autoregressive.pth'))
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self.clvp = CLVP(dim_text=512, dim_speech=512, dim_latent=512, num_text_tokens=256, text_enc_depth=12,
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text_seq_len=350, text_heads=8,
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num_speech_tokens=8192, speech_enc_depth=12, speech_heads=8, speech_seq_len=430,
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use_xformers=True).cpu().eval()
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self.clvp.load_state_dict(torch.load('.models/clvp.pth'))
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self.cvvp = CVVP(model_dim=512, transformer_heads=8, dropout=0, mel_codes=8192, conditioning_enc_depth=8, cond_mask_percentage=0,
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speech_enc_depth=8, speech_mask_percentage=0, latent_multiplier=1).cpu().eval()
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self.cvvp.load_state_dict(torch.load('.models/cvvp.pth'))
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self.diffusion = DiffusionTts(model_channels=1024, num_layers=10, in_channels=100, out_channels=200,
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in_latent_channels=1024, in_tokens=8193, dropout=0, use_fp16=False, num_heads=16,
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layer_drop=0, unconditioned_percentage=0).cpu().eval()
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self.diffusion.load_state_dict(torch.load('.models/diffusion_decoder.pth'))
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self.vocoder = UnivNetGenerator().cpu()
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self.vocoder.load_state_dict(torch.load('.models/vocoder.pth')['model_g'])
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self.vocoder.eval(inference=True)
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def tts_with_preset(self, text, voice_samples, preset='fast', **kwargs):
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"""
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Calls TTS with one of a set of preset generation parameters. Options:
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'ultra_fast': Produces speech at a speed which belies the name of this repo. (Not really, but it's definitely fastest).
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'fast': Decent quality speech at a decent inference rate. A good choice for mass inference.
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'standard': Very good quality. This is generally about as good as you are going to get.
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'high_quality': Use if you want the absolute best. This is not really worth the compute, though.
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"""
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# Use generally found best tuning knobs for generation.
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kwargs.update({'temperature': .8, 'length_penalty': 1.0, 'repetition_penalty': 2.0,
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#'typical_sampling': True,
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'top_p': .8,
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'cond_free_k': 2.0, 'diffusion_temperature': 1.0})
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# Presets are defined here.
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presets = {
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'ultra_fast': {'num_autoregressive_samples': 32, 'diffusion_iterations': 16, 'cond_free': False},
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'fast': {'num_autoregressive_samples': 96, 'diffusion_iterations': 32},
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'standard': {'num_autoregressive_samples': 256, 'diffusion_iterations': 128},
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'high_quality': {'num_autoregressive_samples': 512, 'diffusion_iterations': 1024},
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}
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kwargs.update(presets[preset])
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return self.tts(text, voice_samples, **kwargs)
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def tts(self, text, voice_samples, k=1, verbose=True,
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# autoregressive generation parameters follow
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num_autoregressive_samples=512, temperature=.8, length_penalty=1, repetition_penalty=2.0, top_p=.8, max_mel_tokens=500,
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typical_sampling=False, typical_mass=.9,
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# CLVP & CVVP parameters
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clvp_cvvp_slider=.5,
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# diffusion generation parameters follow
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diffusion_iterations=100, cond_free=True, cond_free_k=2, diffusion_temperature=1.0,
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**hf_generate_kwargs):
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"""
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Produces an audio clip of the given text being spoken with the given reference voice.
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:param text: Text to be spoken.
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:param voice_samples: List of 2 or more ~10 second reference clips which should be torch tensors containing 22.05kHz waveform data.
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:param k: The number of returned clips. The most likely (as determined by Tortoises' CLVP and CVVP models) clips are returned.
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:param verbose: Whether or not to print log messages indicating the progress of creating a clip. Default=true.
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~~AUTOREGRESSIVE KNOBS~~
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:param num_autoregressive_samples: Number of samples taken from the autoregressive model, all of which are filtered using CLVP+CVVP.
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As Tortoise is a probabilistic model, more samples means a higher probability of creating something "great".
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:param temperature: The softmax temperature of the autoregressive model.
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:param length_penalty: A length penalty applied to the autoregressive decoder. Higher settings causes the model to produce more terse outputs.
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:param repetition_penalty: A penalty that prevents the autoregressive decoder from repeating itself during decoding. Can be used to reduce the incidence
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of long silences or "uhhhhhhs", etc.
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:param top_p: P value used in nucleus sampling. (0,1]. Lower values mean the decoder produces more "likely" (aka boring) outputs.
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:param max_mel_tokens: Restricts the output length. (0,600] integer. Each unit is 1/20 of a second.
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:param typical_sampling: Turns typical sampling on or off. This sampling mode is discussed in this paper: https://arxiv.org/abs/2202.00666
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I was interested in the premise, but the results were not as good as I was hoping. This is off by default, but
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could use some tuning.
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:param typical_mass: The typical_mass parameter from the typical_sampling algorithm.
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~~CLVP-CVVP KNOBS~~
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:param clvp_cvvp_slider: Controls the influence of the CLVP and CVVP models in selecting the best output from the autoregressive model.
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[0,1]. Values closer to 1 will cause Tortoise to emit clips that follow the text more. Values closer to
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0 will cause Tortoise to emit clips that more closely follow the reference clip (e.g. the voice sounds more
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similar).
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~~DIFFUSION KNOBS~~
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:param diffusion_iterations: Number of diffusion steps to perform. [0,4000]. More steps means the network has more chances to iteratively refine
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the output, which should theoretically mean a higher quality output. Generally a value above 250 is not noticeably better,
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however.
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:param cond_free: Whether or not to perform conditioning-free diffusion. Conditioning-free diffusion performs two forward passes for
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each diffusion step: one with the outputs of the autoregressive model and one with no conditioning priors. The output
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of the two is blended according to the cond_free_k value below. Conditioning-free diffusion is the real deal, and
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dramatically improves realism.
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:param cond_free_k: Knob that determines how to balance the conditioning free signal with the conditioning-present signal. [0,inf].
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As cond_free_k increases, the output becomes dominated by the conditioning-free signal.
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Formula is: output=cond_present_output*(cond_free_k+1)-cond_absenct_output*cond_free_k
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:param diffusion_temperature: Controls the variance of the noise fed into the diffusion model. [0,1]. Values at 0
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are the "mean" prediction of the diffusion network and will sound bland and smeared.
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~~OTHER STUFF~~
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:param hf_generate_kwargs: The huggingface Transformers generate API is used for the autoregressive transformer.
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Extra keyword args fed to this function get forwarded directly to that API. Documentation
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here: https://huggingface.co/docs/transformers/internal/generation_utils
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:return: Generated audio clip(s) as a torch tensor. Shape 1,S if k=1 else, (k,1,S) where S is the sample length.
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Sample rate is 24kHz.
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"""
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text = torch.IntTensor(self.tokenizer.encode(text)).unsqueeze(0).cuda()
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text = F.pad(text, (0, 1)) # This may not be necessary.
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conds = []
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if not isinstance(voice_samples, list):
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voice_samples = [voice_samples]
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for vs in voice_samples:
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conds.append(format_conditioning(vs))
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conds = torch.stack(conds, dim=1)
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diffuser = load_discrete_vocoder_diffuser(desired_diffusion_steps=diffusion_iterations, cond_free=cond_free, cond_free_k=cond_free_k)
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with torch.no_grad():
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samples = []
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num_batches = num_autoregressive_samples // self.autoregressive_batch_size
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stop_mel_token = self.autoregressive.stop_mel_token
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calm_token = 83 # This is the token for coding silence, which is fixed in place with "fix_autoregressive_output"
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self.autoregressive = self.autoregressive.cuda()
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if verbose:
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print("Generating autoregressive samples..")
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for b in tqdm(range(num_batches), disable=not verbose):
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codes = self.autoregressive.inference_speech(conds, text,
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do_sample=True,
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top_p=top_p,
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temperature=temperature,
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num_return_sequences=self.autoregressive_batch_size,
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length_penalty=length_penalty,
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repetition_penalty=repetition_penalty,
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max_generate_length=max_mel_tokens,
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**hf_generate_kwargs)
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padding_needed = max_mel_tokens - codes.shape[1]
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codes = F.pad(codes, (0, padding_needed), value=stop_mel_token)
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samples.append(codes)
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self.autoregressive = self.autoregressive.cpu()
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clip_results = []
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self.clvp = self.clvp.cuda()
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self.cvvp = self.cvvp.cuda()
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if verbose:
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print("Computing best candidates using CLVP and CVVP")
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for batch in tqdm(samples, disable=not verbose):
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for i in range(batch.shape[0]):
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batch[i] = fix_autoregressive_output(batch[i], stop_mel_token)
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clvp = self.clvp(text.repeat(batch.shape[0], 1), batch, return_loss=False)
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cvvp_accumulator = 0
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for cl in range(conds.shape[1]):
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cvvp_accumulator = cvvp_accumulator + self.cvvp(conds[:, cl].repeat(batch.shape[0], 1, 1), batch, return_loss=False )
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cvvp = cvvp_accumulator / conds.shape[1]
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clip_results.append(clvp * clvp_cvvp_slider + cvvp * (1-clvp_cvvp_slider))
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clip_results = torch.cat(clip_results, dim=0)
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samples = torch.cat(samples, dim=0)
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best_results = samples[torch.topk(clip_results, k=k).indices]
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self.clvp = self.clvp.cpu()
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self.cvvp = self.cvvp.cpu()
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del samples
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# The diffusion model actually wants the last hidden layer from the autoregressive model as conditioning
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# inputs. Re-produce those for the top results. This could be made more efficient by storing all of these
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# results, but will increase memory usage.
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self.autoregressive = self.autoregressive.cuda()
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best_latents = self.autoregressive(conds, text, torch.tensor([text.shape[-1]], device=conds.device), best_results,
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torch.tensor([best_results.shape[-1]*self.autoregressive.mel_length_compression], device=conds.device),
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return_latent=True, clip_inputs=False)
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self.autoregressive = self.autoregressive.cpu()
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if verbose:
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print("Transforming autoregressive outputs into audio..")
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wav_candidates = []
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self.diffusion = self.diffusion.cuda()
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self.vocoder = self.vocoder.cuda()
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for b in range(best_results.shape[0]):
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codes = best_results[b].unsqueeze(0)
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latents = best_latents[b].unsqueeze(0)
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# Find the first occurrence of the "calm" token and trim the codes to that.
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ctokens = 0
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for k in range(codes.shape[-1]):
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if codes[0, k] == calm_token:
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ctokens += 1
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else:
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ctokens = 0
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if ctokens > 8: # 8 tokens gives the diffusion model some "breathing room" to terminate speech.
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latents = latents[:, :k]
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break
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mel = do_spectrogram_diffusion(self.diffusion, diffuser, latents, voice_samples, temperature=diffusion_temperature, verbose=verbose)
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wav = self.vocoder.inference(mel)
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wav_candidates.append(wav.cpu())
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self.diffusion = self.diffusion.cpu()
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self.vocoder = self.vocoder.cpu()
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if len(wav_candidates) > 1:
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return wav_candidates
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return wav_candidates[0]
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