forked from mrq/DL-Art-School
184 lines
6.7 KiB
Python
184 lines
6.7 KiB
Python
from random import random
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import torch
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import torch.nn as nn
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import torch.nn.functional as F
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from torch import einsum
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from models.arch_util import AttentionBlock
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from models.lucidrains.x_transformers import ContinuousTransformerWrapper, Encoder
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from trainer.networks import register_model
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from utils.util import opt_get, checkpoint
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def exists(val):
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return val is not None
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def masked_mean(t, mask):
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t = t.masked_fill(~mask, 0.)
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return t.sum(dim = 1) / mask.sum(dim = 1)
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class CollapsingTransformer(nn.Module):
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def __init__(self, model_dim, output_dims, heads, dropout, depth, mask_percentage=0, **encoder_kwargs):
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super().__init__()
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self.transformer = ContinuousTransformerWrapper(
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max_seq_len=-1,
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use_pos_emb=False,
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attn_layers=Encoder(
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dim=model_dim,
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depth=depth,
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heads=heads,
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ff_dropout=dropout,
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ff_mult=1,
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attn_dropout=dropout,
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use_rmsnorm=True,
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ff_glu=True,
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rotary_pos_emb=True,
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**encoder_kwargs,
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))
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self.pre_combiner = nn.Sequential(nn.Conv1d(model_dim, output_dims, 1),
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AttentionBlock(output_dims, num_heads=heads, do_checkpoint=False),
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nn.Conv1d(output_dims, output_dims, 1))
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self.mask_percentage = mask_percentage
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def forward(self, x, **transformer_kwargs):
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h = self.transformer(x, **transformer_kwargs)
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h = h.permute(0,2,1)
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h = checkpoint(self.pre_combiner, h).permute(0,2,1)
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if self.training:
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mask = torch.rand_like(h.float()) > self.mask_percentage
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else:
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mask = torch.ones_like(h.float()).bool()
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return masked_mean(h, mask)
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class ConvFormatEmbedding(nn.Module):
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def __init__(self, *args, **kwargs):
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super().__init__()
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self.emb = nn.Embedding(*args, **kwargs)
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def forward(self, x):
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y = self.emb(x)
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return y.permute(0,2,1)
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class CLVP(nn.Module):
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"""
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Contrastic Language-Voice Pretraining model for generating embedding that can be used to associate text and
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speech clips.
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"""
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def __init__(
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self,
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model_dim=512,
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transformer_heads=8,
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dropout=.1,
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num_text_tokens=256,
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text_enc_depth=6,
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text_mask_percentage=0,
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conditioning_enc_depth=4,
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mask_conditioning_percentage=0.5,
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mel_channels=80,
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mel_codes=None,
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speech_enc_depth=6,
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speech_mask_percentage=0,
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latent_multiplier=4,
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):
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super().__init__()
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latent_dim = latent_multiplier*model_dim
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self.temperature = nn.Parameter(torch.tensor(1.))
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self.cond_emb = nn.Sequential(nn.Conv1d(mel_channels, model_dim//2, kernel_size=5, stride=2, padding=2),
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nn.Conv1d(model_dim//2, model_dim, kernel_size=3, stride=2, padding=1))
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self.conditioning_transformer = CollapsingTransformer(model_dim, model_dim*2, transformer_heads, dropout, conditioning_enc_depth, 0)
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self.masked_conditioning_latent = nn.Parameter(torch.randn(1,model_dim*2), requires_grad=True)
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self.mask_conditioning_percentage = mask_conditioning_percentage
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self.text_emb = nn.Embedding(num_text_tokens, model_dim)
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self.text_transformer = CollapsingTransformer(model_dim, latent_dim, transformer_heads, dropout, text_enc_depth, text_mask_percentage, use_rms_scaleshift_norm=True)
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self.to_text_latent = nn.Linear(latent_dim, latent_dim, bias=False)
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if mel_codes is None:
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self.speech_emb = nn.Conv1d(mel_channels, model_dim, kernel_size=5, padding=2)
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else:
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self.speech_emb = ConvFormatEmbedding(mel_codes, model_dim)
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self.speech_transformer = CollapsingTransformer(model_dim, latent_dim, transformer_heads, dropout, speech_enc_depth, speech_mask_percentage)
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self.to_speech_latent = nn.Linear(latent_dim, latent_dim, bias=False)
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def get_grad_norm_parameter_groups(self):
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return {
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'conditioning': list(self.conditioning_transformer.parameters()),
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'text': list(self.text_transformer.parameters()),
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'speech': list(self.speech_transformer.parameters()),
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}
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def forward(
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self,
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text,
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mel_input,
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mel_cond,
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return_loss=False
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):
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b, device = text.shape[0], text.device
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text_emb = self.text_emb(text)
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speech_emb = self.speech_emb(mel_input).permute(0,2,1)
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unused_params = []
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if random() < self.mask_conditioning_percentage:
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enc_cond = self.masked_conditioning_latent
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unused_params.extend(list(self.cond_emb.parameters()) + list(self.conditioning_transformer.parameters()))
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else:
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cond_emb = self.cond_emb(mel_cond).permute(0,2,1)
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enc_cond = self.conditioning_transformer(cond_emb)
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unused_params.append(self.masked_conditioning_latent)
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enc_text = self.text_transformer(text_emb, norm_scale_shift_inp=enc_cond)
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enc_speech = self.speech_transformer(speech_emb)
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text_latents = self.to_text_latent(enc_text)
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speech_latents = self.to_speech_latent(enc_speech)
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text_latents, speech_latents = map(lambda t: F.normalize(t, p=2, dim=-1), (text_latents, speech_latents))
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temp = self.temperature.exp()
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if not return_loss:
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sim = einsum('n d, n d -> n', text_latents, speech_latents) * temp
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return sim
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sim = einsum('i d, j d -> i j', text_latents, speech_latents) * temp
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labels = torch.arange(b, device=device)
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loss = (F.cross_entropy(sim, labels) + F.cross_entropy(sim.t(), labels)) / 2
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# Involve probabilistic or possibly unused parameters in loss so we don't get DDP errors.
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extraneous_addition = 0
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for p in unused_params:
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extraneous_addition = extraneous_addition + p.mean()
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loss = loss + extraneous_addition * 0
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return loss
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@register_model
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def register_clvp(opt_net, opt):
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return CLVP(**opt_get(opt_net, ['kwargs'], {}))
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if __name__ == '__main__':
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clvp = CLVP()
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clvp(torch.randint(0,256,(2,120)),
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torch.randn(2,80,100),
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torch.randn(2,80,95),
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return_loss=True)
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nonloss = clvp(torch.randint(0,256,(2,120)),
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torch.randn(2,80,100),
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torch.randn(2,80,95),
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return_loss=False)
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clvp = CLVP(mel_codes=8192)
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clvp(torch.randint(0,256,(2,120)),
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torch.randint(0,8192,(2,150)),
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torch.randn(2,80,95),
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return_loss=True)
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print(nonloss.shape) |