DL-Art-School/codes/models/gpt_voice/gpt_tts.py

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import torch
import torch.nn as nn
import torch.nn.functional as F
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from models.gpt_voice.lucidrains_gpt import Transformer
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from models.tacotron2.taco_utils import get_mask_from_lengths
from models.tacotron2.text import symbols
from trainer.networks import register_model
class GptTts(nn.Module):
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MAX_SYMBOLS_PER_PHRASE = 200
NUMBER_SYMBOLS = len(symbols)
NUMBER_TEXT_TOKENS = NUMBER_SYMBOLS + MAX_SYMBOLS_PER_PHRASE + 2
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MEL_DICTIONARY_SIZE = 512+3
MEL_START_TOKEN = MEL_DICTIONARY_SIZE-3
MEL_STOP_TOKEN = MEL_DICTIONARY_SIZE-2
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def __init__(self):
super().__init__()
model_dim = 512
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max_mel_frames = 900 * 3 // 8 # 900 is the max number of MEL frames. The VQVAE outputs 3/8 of the input mel as tokens.
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self.model_dim = model_dim
self.max_mel_frames = max_mel_frames
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self.text_embedding = nn.Embedding(self.NUMBER_TEXT_TOKENS, model_dim)
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self.mel_embedding = nn.Embedding(self.MEL_DICTIONARY_SIZE, model_dim)
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self.text_pos_embedding = nn.Embedding(self.MAX_SYMBOLS_PER_PHRASE, model_dim)
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self.mel_pos_embedding = nn.Embedding(max_mel_frames, model_dim)
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#self.gpt = GPT(GPTConfig(1+max_symbols_per_phrase+max_mel_frames, n_embd=model_dim, n_head=8), do_pos_emb=False)
self.gpt = Transformer(dim=model_dim, depth=8, seq_len=1+self.MAX_SYMBOLS_PER_PHRASE+max_mel_frames, heads=8)
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self.final_norm = nn.LayerNorm(model_dim)
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self.text_head = nn.Linear(model_dim, self.NUMBER_TEXT_TOKENS)
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self.mel_head = nn.Linear(model_dim, self.MEL_DICTIONARY_SIZE)
def forward(self, text_inputs, text_lengths, mel_targets, output_lengths):
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text_emb = self.text_embedding(text_inputs)
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text_emb = text_emb + self.text_pos_embedding(torch.arange(text_inputs.shape[1], device=text_inputs.device))
mel_emb = self.mel_embedding(mel_targets)
mel_emb = mel_emb + self.mel_pos_embedding(torch.arange(mel_targets.shape[1], device=mel_targets.device))
emb = torch.cat([text_emb, mel_emb], dim=1)
enc = self.gpt(emb)
# Compute logits for text and mel heads
text_logits = self.final_norm(enc[:, :text_emb.shape[1]])
mel_logits = self.final_norm(enc[:, text_emb.shape[1]:])
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text_logits = self.text_head(text_logits)
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mel_logits = self.mel_head(mel_logits)
# Compute loss
text_targets = text_inputs[:,1:]
text_logits = text_logits.permute(0,2,1)[:,:,:-1] # The last element of the logits is unneeded because the input to the transformer contains a <EOS> token for both text and mel.
loss_text = F.cross_entropy(text_logits, text_targets, reduction='none')
mel_targets = mel_targets[:,1:]
mel_logits = mel_logits.permute(0,2,1)[:,:,:-1]
loss_mel = F.cross_entropy(mel_logits, mel_targets, reduction='none')
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# Fix up mel_logits so it can go into a VAE decoder as well.
mel_codes = torch.argmax(F.softmax(mel_logits, dim=1), dim=1)
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mel_pad_mask = ~get_mask_from_lengths(output_lengths-1, mel_targets.shape[1])
mel_codes = mel_codes * torch.ones_like(mel_codes).masked_fill_(mel_pad_mask, 0)
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mel_codes = mel_codes[:,:-1] # Strip off <EOS> token too (or padding). The important part is that the output sequence length is identical to the VAE input.
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extra_mask = mel_codes < self.MEL_DICTIONARY_SIZE-3 # The VAE doesn't know about START/STOP/PAD
mel_codes = mel_codes * extra_mask
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# This class also returns the mel_targets for validation purposes. Format those.
mel_targets = mel_targets[:,:-1]
mel_targets = mel_targets * (mel_targets < self.MEL_DICTIONARY_SIZE-3)
return loss_text.mean(), loss_mel.mean(), mel_codes, mel_targets
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def inference(self, text_inputs):
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text_emb = self.text_embedding(text_inputs)
text_emb = text_emb + self.text_pos_embedding(torch.arange(text_inputs.shape[1], device=text_inputs.device))
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mel_seq = torch.full((text_emb.shape[0],1), fill_value=self.MEL_START_TOKEN, device=text_emb.device)
stop_encountered = torch.zeros((text_emb.shape[0],), device=text_emb.device)
while not torch.all(stop_encountered) and len(mel_seq) < self.max_mel_frames:
mel_emb = self.mel_embedding(mel_seq)
mel_emb = mel_emb + self.mel_pos_embedding(torch.arange(mel_emb.shape[1], device=mel_emb.device))
emb = torch.cat([text_emb, mel_emb], dim=1)
enc = self.gpt(emb)
mel_logits = self.final_norm(enc[:, text_emb.shape[1]:])
mel_logits = self.mel_head(mel_logits)
mel_codes = torch.argmax(F.softmax(mel_logits, dim=-1), dim=-1)
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mel_seq = torch.cat([mel_seq, mel_codes[:, -1].unsqueeze(1)], dim=1)
stop_encountered = torch.logical_or(stop_encountered, mel_seq[:,-1] == self.MEL_STOP_TOKEN)
if len(mel_seq) >= self.max_mel_frames:
print("Warning! Encountered frame limit before a stop token. Output is likely wrong.")
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# Prevent sending invalid tokens to the VAE. Also pad to a length of 3, which is required by the DVAE.
mel_seq = mel_seq * (mel_seq < 512)
padding_needed = 3-(mel_seq.shape[1]%3)
mel_seq = F.pad(mel_seq, (0,padding_needed))
return mel_seq
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@register_model
def register_gpt_tts(opt_net, opt):
return GptTts()
if __name__ == '__main__':
gpt = GptTts()
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l1, l2, i = gpt(torch.randint(high=24, size=(2,60)),
torch.tensor([55,58]),
torch.randint(high=512, size=(2,310)),
torch.tensor([300,305]))
print(i.shape)
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#o = gpt.infer(torch.randint(high=24, size=(2,60)))
#print(o.shape)
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