diff --git a/codes/models/gpt_voice/unified_voice.py b/codes/models/gpt_voice/unified_voice.py index 70b35f31..e9a08964 100644 --- a/codes/models/gpt_voice/unified_voice.py +++ b/codes/models/gpt_voice/unified_voice.py @@ -50,7 +50,7 @@ class UnifiedGptVoice(nn.Module): def __init__(self, layers=8, model_dim=512, heads=8, max_symbols_per_phrase=120, max_mel_tokens=250, max_total_tokens=370, max_conditioning_inputs=3, checkpointing=True, mel_length_compression=1024, max_conditioning_length=60, number_text_tokens=256, start_text_token=255, stop_text_token=0, number_mel_codes=8194, start_mel_token=8192, - stop_mel_token=8193): + stop_mel_token=8193, use_dedicated_position_embeddings_for_paired=True): super().__init__() self.number_text_tokens = number_text_tokens @@ -69,9 +69,13 @@ class UnifiedGptVoice(nn.Module): self.conditioning_encoder = ConditioningEncoder(80, model_dim, num_attn_heads=heads) self.text_embedding = nn.Embedding(self.number_text_tokens, model_dim) self.text_pos_solo_embedding = nn.Embedding(self.max_symbols_per_phrase + 1, model_dim) - self.text_pos_paired_embedding = nn.Embedding(self.max_symbols_per_phrase + 1, model_dim) self.mel_pos_solo_embedding = nn.Embedding(self.max_mel_tokens + 1, model_dim) - self.mel_pos_paired_embedding = nn.Embedding(self.max_mel_tokens + 1, model_dim) + if use_dedicated_position_embeddings_for_paired: + self.mel_pos_paired_embedding = nn.Embedding(self.max_mel_tokens + 1, model_dim) + self.text_pos_paired_embedding = nn.Embedding(self.max_symbols_per_phrase + 1, model_dim) + else: + self.mel_pos_paired_embedding = self.mel_pos_solo_embedding + self.text_pos_paired_embedding = self.text_pos_solo_embedding seq_length = 2+self.max_total_tokens+self.max_conditioning_inputs self.gpt_config = GPT2Config(vocab_size=self.number_mel_codes, n_positions=seq_length, @@ -247,7 +251,7 @@ def register_unified_gpt_voice(opt_net, opt): if __name__ == '__main__': - gpt = UnifiedGptVoice(model_dim=256, heads=4) + gpt = UnifiedGptVoice(model_dim=256, heads=4, use_dedicated_position_embeddings_for_paired=False) l = gpt(torch.randn(2, 80, 800), torch.randint(high=len(symbols), size=(2,80)), torch.randint(high=8192, size=(2,250)), diff --git a/codes/models/gpt_voice/unified_voice_bilevel.py b/codes/models/gpt_voice/unified_voice_bilevel.py new file mode 100644 index 00000000..70b35f31 --- /dev/null +++ b/codes/models/gpt_voice/unified_voice_bilevel.py @@ -0,0 +1,254 @@ +import functools + +import torch +import torch.nn as nn +import torch.nn.functional as F +from transformers import GPT2Model, GPT2Config + +from models.arch_util import AttentionBlock +from models.gpt_voice.gpt_asr_hf import GPT2InferenceModel +from models.tacotron2.text import symbols +from trainer.networks import register_model +from utils.util import opt_get + + +class ConditioningEncoder(nn.Module): + def __init__(self, + spec_dim, + embedding_dim, + attn_blocks=6, + num_attn_heads=4, + do_checkpointing=False): + super().__init__() + attn = [] + self.init = nn.Conv1d(spec_dim, embedding_dim, kernel_size=1) + for a in range(attn_blocks): + attn.append(AttentionBlock(embedding_dim, num_attn_heads, do_checkpoint=do_checkpointing)) + self.attn = nn.Sequential(*attn) + self.dim = embedding_dim + self.do_checkpointing = do_checkpointing + + def forward(self, x): + h = self.init(x) + h = self.attn(h) + return h[:, :, 0] + + +def null_position_embeddings(range, dim): + return torch.zeros((range.shape[0], range.shape[1], dim), device=range.device) + + +class UnifiedGptVoice(nn.Module): + """ + Derived from GptTtsHf, but offers multiple modes of autoregressive operation: + - Text only + - Voice only + - Text conditioned on voice + - Voice conditioned on text + """ + + def __init__(self, layers=8, model_dim=512, heads=8, max_symbols_per_phrase=120, max_mel_tokens=250, max_total_tokens=370, max_conditioning_inputs=3, + checkpointing=True, mel_length_compression=1024, max_conditioning_length=60, number_text_tokens=256, + start_text_token=255, stop_text_token=0, number_mel_codes=8194, start_mel_token=8192, + stop_mel_token=8193): + super().__init__() + + self.number_text_tokens = number_text_tokens + self.start_text_token = start_text_token + self.stop_text_token = stop_text_token + self.number_mel_codes = number_mel_codes + self.start_mel_token = start_mel_token + self.stop_mel_token = stop_mel_token + + self.max_mel_tokens = max_mel_tokens + self.max_symbols_per_phrase = max_symbols_per_phrase + self.max_total_tokens = max_total_tokens + self.model_dim = model_dim + self.max_conditioning_inputs = max_conditioning_inputs + self.mel_length_compression = mel_length_compression + self.conditioning_encoder = ConditioningEncoder(80, model_dim, num_attn_heads=heads) + self.text_embedding = nn.Embedding(self.number_text_tokens, model_dim) + self.text_pos_solo_embedding = nn.Embedding(self.max_symbols_per_phrase + 1, model_dim) + self.text_pos_paired_embedding = nn.Embedding(self.max_symbols_per_phrase + 1, model_dim) + self.mel_pos_solo_embedding = nn.Embedding(self.max_mel_tokens + 1, model_dim) + self.mel_pos_paired_embedding = nn.Embedding(self.max_mel_tokens + 1, model_dim) + seq_length = 2+self.max_total_tokens+self.max_conditioning_inputs + self.gpt_config = GPT2Config(vocab_size=self.number_mel_codes, + n_positions=seq_length, + n_ctx=seq_length, + n_embd=model_dim, + n_layer=layers, + n_head=heads, + gradient_checkpointing=checkpointing, + use_cache=not checkpointing) + self.gpt = GPT2Model(self.gpt_config) + # Override the built in positional embeddings + del self.gpt.wpe + self.gpt.wpe = functools.partial(null_position_embeddings, dim=model_dim) + + self.final_norm = nn.LayerNorm(model_dim) + self.text_head = nn.Linear(model_dim, self.number_text_tokens) + self.mel_head = nn.Linear(model_dim, self.number_mel_codes) + self.max_conditioning_length = max_conditioning_length + + # Initialize the embeddings per the GPT-2 scheme + for module in [self.text_embedding, self.text_pos_solo_embedding, self.text_pos_paired_embedding, + self.mel_pos_solo_embedding, self.mel_pos_paired_embedding]: + module.weight.data.normal_(mean=0.0, std=self.gpt.config.initializer_range) + if module.padding_idx is not None: + module.weight.data[module.padding_idx].zero_() + + def build_aligned_inputs_and_targets(self, input, start_token, stop_token): + inp = F.pad(input, (1,0), value=start_token) + tar = F.pad(input, (0,1), value=stop_token) + return inp, tar + + def set_mel_padding(self, mel_input_tokens, wav_lengths): + """ + Given mel tokens that are derived from a padded audio clip and the actual lengths of each batch element in + that audio clip, reformats the tokens with STOP_MEL_TOKEN in place of the zero padding. This is required + preformatting to create a working TTS model. + """ + # Set padding areas within MEL (currently it is coded with the MEL code for ). + mel_lengths = wav_lengths // self.mel_length_compression + for b in range(len(mel_lengths)): + actual_end = mel_lengths[b] + 1 # Due to the convolutional nature of how these tokens are generated, it would be best if the model predicts a token past the actual last token. + if actual_end < mel_input_tokens.shape[-1]: + mel_input_tokens[b, actual_end:] = self.stop_mel_token + return mel_input_tokens + + def randomly_permute_conditioning_input(self, speech_conditioning_input): + """ + Randomly permute the conditioning spectrogram, to destroy any structure present. Note that since the + conditioning input is derived from a discrete spectrogram, it does actually retain structure, but only a little + bit (actually: exactly how much we want; enough to discriminate different vocal qualities, but nothing about + what is being said). + """ + cond_input = speech_conditioning_input[:,:,torch.randperm(speech_conditioning_input.shape[-1])] + if cond_input.shape[-1] > self.max_conditioning_length: + cond_input = cond_input[:,:,:self.max_conditioning_length] + return cond_input + + def get_logits(self, speech_conditioning_input, first_inputs, first_head, second_inputs=None, second_head=None, get_attns=False): + if second_inputs is not None: + emb = torch.cat([speech_conditioning_input, first_inputs, second_inputs], dim=1) + else: + emb = torch.cat([speech_conditioning_input, first_inputs], dim=1) + + gpt_out = self.gpt(inputs_embeds=emb, return_dict=True, output_attentions=get_attns) + if get_attns: + return gpt_out.attentions + + enc = gpt_out.last_hidden_state[:, 1:] # The first logit is tied to the speech_conditioning_input + enc = self.final_norm(enc) + first_logits = enc[:, :first_inputs.shape[1]] + first_logits = first_head(first_logits) + first_logits = first_logits.permute(0,2,1) + if second_inputs is not None: + second_logits = enc[:, -second_inputs.shape[1]:] + second_logits = second_head(second_logits) + second_logits = second_logits.permute(0,2,1) + return first_logits, second_logits + else: + return first_logits + + def forward(self, speech_conditioning_input, text_inputs, mel_inputs, wav_lengths, text_first=True, return_attentions=False): + """ + Forward pass that uses both text and voice in either text conditioning mode or voice conditioning mode + (actuated by `text_first`). + + speech_conditioning_input: MEL float tensor, (b,80,s) + text_inputs: long tensor, (b,t) + mel_inputs: long tensor, (b,m) + wav_lengths: long tensor, (b,) + """ + assert self.max_mel_tokens >= mel_inputs.shape[1], f'{mel_inputs.shape[1]}' + assert self.max_symbols_per_phrase >= text_inputs.shape[1], f'{text_inputs.shape[1]}' + assert self.max_total_tokens >= mel_inputs.shape[1] + text_inputs.shape[1], f'{mel_inputs.shape[1]}, {text_inputs.shape[1]}' + + mel_inputs = self.set_mel_padding(mel_inputs, wav_lengths) + speech_conditioning_input = self.randomly_permute_conditioning_input(speech_conditioning_input) + speech_conditioning_input = self.conditioning_encoder(speech_conditioning_input).unsqueeze(1) + + text_inputs, text_targets = self.build_aligned_inputs_and_targets(text_inputs, self.start_text_token, self.stop_text_token) + text_emb = self.text_embedding(text_inputs) + self.text_pos_paired_embedding(torch.arange(text_inputs.shape[1], device=text_inputs.device)) + mel_inputs, mel_targets = self.build_aligned_inputs_and_targets(mel_inputs, self.start_mel_token, self.stop_mel_token) + mel_emb = self.gpt.get_input_embeddings()(mel_inputs) + mel_emb = mel_emb + self.mel_pos_paired_embedding(torch.arange(mel_emb.shape[1], device=mel_emb.device)) + if text_first: + text_logits, mel_logits = self.get_logits(speech_conditioning_input, text_emb, self.text_head, mel_emb, self.mel_head, get_attns=return_attentions) + else: + mel_logits, text_logits = self.get_logits(speech_conditioning_input, mel_emb, self.mel_head, text_emb, self.text_head, get_attns=return_attentions) + + if return_attentions: + return mel_logits + loss_text = F.cross_entropy(text_logits, text_targets.long()) + loss_mel = F.cross_entropy(mel_logits, mel_targets.long()) + return loss_text.mean(), loss_mel.mean(), mel_logits + + def text_forward(self, speech_conditioning_input, text_inputs): + """ + Performs autoregressive modeling on only text. Still requires a speech_conditioning_input due to the way the + model inputs are formatted. Just provide any audio clip (arguably, zeros could be provided). + """ + assert self.max_symbols_per_phrase >= text_inputs.shape[1], f'{text_inputs.shape[1]}' + + speech_conditioning_input = self.randomly_permute_conditioning_input(speech_conditioning_input) + speech_conditioning_input = self.conditioning_encoder(speech_conditioning_input).unsqueeze(1) + + text_inputs, text_targets = self.build_aligned_inputs_and_targets(text_inputs, self.start_text_token, self.stop_text_token) + text_emb = self.text_embedding(text_inputs) + self.text_pos_solo_embedding(torch.arange(text_inputs.shape[1], device=text_inputs.device)) + text_logits = self.get_logits(speech_conditioning_input, text_emb, self.text_head) + loss_text = F.cross_entropy(text_logits, text_targets.long()) + return loss_text.mean() + + def speech_forward(self, speech_conditioning_input, mel_inputs, wav_lengths): + """ + Performs autoregressive modeling on only speech data. + """ + assert self.max_mel_tokens >= mel_inputs.shape[1], f'{mel_inputs.shape[1]}' + + mel_inputs = self.set_mel_padding(mel_inputs, wav_lengths) + speech_conditioning_input = self.randomly_permute_conditioning_input(speech_conditioning_input) + speech_conditioning_input = self.conditioning_encoder(speech_conditioning_input).unsqueeze(1) + + mel_inputs, mel_targets = self.build_aligned_inputs_and_targets(mel_inputs, self.start_mel_token, self.stop_mel_token) + mel_emb = self.gpt.get_input_embeddings()(mel_inputs) + mel_emb = mel_emb + self.mel_pos_solo_embedding(torch.arange(mel_emb.shape[1], device=mel_emb.device)) + mel_logits = self.get_logits(speech_conditioning_input, mel_emb, self.mel_head) + loss_mel = F.cross_entropy(mel_logits, mel_targets.long()) + return loss_mel.mean() + + def inference_speech(self, speech_conditioning_input, text_inputs, **hf_generate_kwargs): + if not hasattr(self, 'inference_model'): + self.inference_model = GPT2InferenceModel(self.gpt_config, self.gpt, self.mel_pos_paired_embedding, self.final_norm, self.mel_head) + + text_inputs, text_targets = self.build_aligned_inputs_and_targets(text_inputs, self.start_text_token, self.stop_text_token) + text_emb = self.text_embedding(text_inputs) + self.text_pos_paired_embedding(torch.arange(text_inputs.shape[1], device=text_inputs.device)) + + # Randomly permute the conditioning spectrogram, to destroy any structure present. + speech_conditioning_input = self.randomly_permute_conditioning_input(speech_conditioning_input) + cond = self.conditioning_encoder(speech_conditioning_input).unsqueeze(1) + + emb = torch.cat([cond, text_emb], dim=1) + self.inference_model.store_mel_emb(emb) + + fake_inputs = torch.full((emb.shape[0],emb.shape[1]+1,), fill_value=1, dtype=torch.long, device=text_inputs.device) + fake_inputs[:,-1] = self.start_mel_token + + gen = self.inference_model.generate(fake_inputs, bos_token_id=self.start_mel_token, pad_token_id=self.stop_mel_token, eos_token_id=self.stop_mel_token, + max_length=self.gpt_config.n_positions, **hf_generate_kwargs) + return gen[:, fake_inputs.shape[1]:] + + +@register_model +def register_unified_gpt_voice(opt_net, opt): + return UnifiedGptVoice(**opt_get(opt_net, ['kwargs'], {})) + + +if __name__ == '__main__': + gpt = UnifiedGptVoice(model_dim=256, heads=4) + l = gpt(torch.randn(2, 80, 800), + torch.randint(high=len(symbols), size=(2,80)), + torch.randint(high=8192, size=(2,250)), + torch.tensor([150*256,195*256]))