VoiceCLIP model

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James Betker 2021-12-22 13:44:11 -07:00
parent 09f7f3e615
commit 7ae7d423af

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import torch
import torch.nn as nn
import torch.nn.functional as F
from einops import rearrange
from torch import einsum
from models.lucidrains.dalle.transformer import Transformer
from trainer.networks import register_model
from utils.util import opt_get
def exists(val):
return val is not None
def masked_mean(t, mask, dim = 1):
t = t.masked_fill(~mask[:, :, None], 0.)
return t.sum(dim = 1) / mask.sum(dim = 1)[..., None]
class VoiceCLIP(nn.Module):
"""
CLIP model retrofitted for performing contrastive evaluation between tokenized audio data and the corresponding
transcribed text.
Originally from https://github.com/lucidrains/DALLE-pytorch/blob/main/dalle_pytorch/dalle_pytorch.py
"""
def __init__(
self,
*,
dim_text=512,
dim_speech=512,
dim_latent=512,
num_text_tokens=10000,
text_enc_depth=6,
text_seq_len=200,
text_heads=8,
num_speech_tokens=8192,
speech_enc_depth=6,
speech_heads=8,
speech_seq_len=250,
):
super().__init__()
self.text_emb = nn.Embedding(num_text_tokens, dim_text)
self.text_pos_emb = nn.Embedding(text_seq_len, dim_text)
self.text_transformer = Transformer(causal=False, seq_len=text_seq_len, dim=dim_text, depth=text_enc_depth,
heads=text_heads, rotary_emb=False)
self.to_text_latent = nn.Linear(dim_text, dim_latent, bias=False)
self.speech_emb = nn.Embedding(num_speech_tokens, dim_speech)
self.speech_pos_emb = nn.Embedding(num_speech_tokens, dim_speech)
self.speech_transformer = Transformer(causal=False, seq_len=speech_seq_len, dim=dim_speech,
depth=speech_enc_depth, heads=speech_heads, rotary_emb=False)
self.to_speech_latent = nn.Linear(dim_speech, dim_latent, bias=False)
self.temperature = nn.Parameter(torch.tensor(1.))
def forward(
self,
text,
speech_tokens,
text_mask=None,
return_loss=False
):
b, device = text.shape[0], text.device
text_emb = self.text_emb(text)
text_emb += self.text_pos_emb(torch.arange(text.shape[1], device=device))
speech_emb = self.speech_emb(speech_tokens)
speech_emb += self.speech_pos_emb(torch.arange(speech_emb.shape[1], device=device))
enc_text = self.text_transformer(text_emb, mask=text_mask)
enc_speech = self.speech_transformer(speech_emb)
if exists(text_mask):
text_latents = masked_mean(enc_text, text_mask, dim=1)
else:
text_latents = enc_text.mean(dim=1)
speech_latents = enc_speech.mean(dim=1)
text_latents = self.to_text_latent(text_latents)
speech_latents = self.to_speech_latent(speech_latents)
text_latents, speech_latents = map(lambda t: F.normalize(t, p=2, dim=-1), (text_latents, speech_latents))
temp = self.temperature.exp()
if not return_loss:
sim = einsum('n d, n d -> n', text_latents, speech_latents) * temp
return sim
sim = einsum('i d, j d -> i j', text_latents, speech_latents) * temp
labels = torch.arange(b, device=device)
loss = (F.cross_entropy(sim, labels) + F.cross_entropy(sim.t(), labels)) / 2
return loss
@register_model
def register_voice_clip(opt_net, opt):
return VoiceCLIP(**opt_get(opt_net, ['kwargs'], {}))
if __name__ == '__main__':
clip = VoiceCLIP()
clip(torch.randint(0,1000,(2,200)),
torch.randint(0,8192,(2,250)),
return_loss=True)