base DVAE & vector_quantizer

This commit is contained in:
James Betker 2021-10-20 21:19:38 -06:00
parent f2a31702b5
commit 0dee15f875
3 changed files with 488 additions and 2 deletions

View File

@ -285,7 +285,7 @@ class DiffusionVocoderWithRef(nn.Module):
self.middle_block.apply(convert_module_to_f32) self.middle_block.apply(convert_module_to_f32)
self.output_blocks.apply(convert_module_to_f32) self.output_blocks.apply(convert_module_to_f32)
def forward(self, x, timesteps, discrete_spectrogram, conditioning_inputs=None, num_conditioning_signals=None): def forward(self, x, timesteps, spectrogram, conditioning_inputs=None, num_conditioning_signals=None):
""" """
Apply the model to an input batch. Apply the model to an input batch.
@ -311,7 +311,7 @@ class DiffusionVocoderWithRef(nn.Module):
h = x.type(self.dtype) h = x.type(self.dtype)
for k, module in enumerate(self.input_blocks): for k, module in enumerate(self.input_blocks):
if isinstance(module, DiscreteSpectrogramConditioningBlock): if isinstance(module, DiscreteSpectrogramConditioningBlock):
h = module(h, discrete_spectrogram) h = module(h, spectrogram)
else: else:
h = module(h, emb) h = module(h, emb)
hs.append(h) hs.append(h)

241
codes/models/vqvae/dvae.py Normal file
View File

@ -0,0 +1,241 @@
import functools
import math
from math import sqrt
import torch
import torch.nn as nn
import torch.nn.functional as F
from einops import rearrange
from torch import einsum
from models.gpt_voice.dvae_arch_playground.discretization_loss import DiscretizationLoss
from models.vqvae.vector_quantizer import VectorQuantize
from models.vqvae.vqvae import Quantize
from trainer.networks import register_model
from utils.util import opt_get
def eval_decorator(fn):
def inner(model, *args, **kwargs):
was_training = model.training
model.eval()
out = fn(model, *args, **kwargs)
model.train(was_training)
return out
return inner
class ResBlock(nn.Module):
def __init__(self, chan, conv, activation):
super().__init__()
self.net = nn.Sequential(
conv(chan, chan, 3, padding = 1),
activation(),
conv(chan, chan, 3, padding = 1),
activation(),
conv(chan, chan, 1)
)
def forward(self, x):
return self.net(x) + x
class UpsampledConv(nn.Module):
def __init__(self, conv, *args, **kwargs):
super().__init__()
assert 'stride' in kwargs.keys()
self.stride = kwargs['stride']
del kwargs['stride']
self.conv = conv(*args, **kwargs)
def forward(self, x):
up = nn.functional.interpolate(x, scale_factor=self.stride, mode='nearest')
return self.conv(up)
class DiscreteVAE(nn.Module):
def __init__(
self,
positional_dims=2,
num_tokens = 512,
codebook_dim = 512,
num_layers = 3,
num_resnet_blocks = 0,
hidden_dim = 64,
channels = 3,
stride = 2,
kernel_size = 3,
activation = 'relu',
straight_through = False,
record_codes = False,
discretization_loss_averaging_steps = 100,
quantizer_use_cosine_sim=True,
quantizer_codebook_misses_to_expiration=40,
quantizer_codebook_embedding_compression=None,
):
super().__init__()
assert num_layers >= 1, 'number of layers must be greater than or equal to 1'
has_resblocks = num_resnet_blocks > 0
self.num_tokens = num_tokens
self.num_layers = num_layers
self.straight_through = straight_through
self.positional_dims = positional_dims
self.discrete_loss = DiscretizationLoss(num_tokens, 2, 1 / (num_tokens*2), discretization_loss_averaging_steps)
assert positional_dims > 0 and positional_dims < 3 # This VAE only supports 1d and 2d inputs for now.
if positional_dims == 2:
conv = nn.Conv2d
conv_transpose = functools.partial(UpsampledConv, conv)
else:
conv = nn.Conv1d
conv_transpose = functools.partial(UpsampledConv, conv)
if activation == 'relu':
act = nn.ReLU
elif activation == 'silu':
act = nn.SiLU
else:
assert NotImplementedError()
enc_chans = [hidden_dim * 2 ** i for i in range(num_layers)]
dec_chans = list(reversed(enc_chans))
enc_chans = [channels, *enc_chans]
dec_init_chan = codebook_dim if not has_resblocks else dec_chans[0]
dec_chans = [dec_init_chan, *dec_chans]
enc_chans_io, dec_chans_io = map(lambda t: list(zip(t[:-1], t[1:])), (enc_chans, dec_chans))
enc_layers = []
dec_layers = []
pad = (kernel_size - 1) // 2
for (enc_in, enc_out), (dec_in, dec_out) in zip(enc_chans_io, dec_chans_io):
enc_layers.append(nn.Sequential(conv(enc_in, enc_out, kernel_size, stride = stride, padding = pad), act()))
dec_layers.append(nn.Sequential(conv_transpose(dec_in, dec_out, kernel_size, stride = stride, padding = pad), act()))
for _ in range(num_resnet_blocks):
dec_layers.insert(0, ResBlock(dec_chans[1], conv, act))
enc_layers.append(ResBlock(enc_chans[-1], conv, act))
if num_resnet_blocks > 0:
dec_layers.insert(0, conv(codebook_dim, dec_chans[1], 1))
enc_layers.append(conv(enc_chans[-1], codebook_dim, 1))
dec_layers.append(conv(dec_chans[-1], channels, 1))
self.encoder = nn.Sequential(*enc_layers)
self.quantizer = VectorQuantize(codebook_dim, num_tokens, codebook_dim=quantizer_codebook_embedding_compression,
use_cosine_sim=quantizer_use_cosine_sim,
max_codebook_misses_before_expiry=quantizer_codebook_misses_to_expiration)
self.decoder = nn.Sequential(*dec_layers)
self.loss_fn = F.mse_loss
self.record_codes = record_codes
if record_codes:
self.codes = torch.zeros((1228800,), dtype=torch.long)
self.code_ind = 0
self.internal_step = 0
def get_debug_values(self, step, __):
if self.record_codes:
# Report annealing schedule
return {'histogram_codes': self.codes}
else:
return {}
@torch.no_grad()
@eval_decorator
def get_codebook_indices(self, images):
logits = self.encoder(images).permute((0,2,3,1) if len(images.shape) == 4 else (0,2,1))
sampled, codes, commitment_loss = self.quantizer(logits)
return codes
def decode(
self,
img_seq
):
self.log_codes(img_seq)
image_embeds = self.quantizer.decode(img_seq)
b, n, d = image_embeds.shape
kwargs = {}
if self.positional_dims == 1:
arrange = 'b n d -> b d n'
else:
h = w = int(sqrt(n))
arrange = 'b (h w) d -> b d h w'
kwargs = {'h': h, 'w': w}
image_embeds = rearrange(image_embeds, arrange, **kwargs)
images = [image_embeds]
for layer in self.decoder:
images.append(layer(images[-1]))
return images[-1], images[-2]
def infer(self, img):
logits = self.encoder(img).permute((0,2,3,1) if len(img.shape) == 4 else (0,2,1))
sampled, codes, commitment_loss = self.quantizer(logits)
return self.decode(codes)
# Note: This module is not meant to be run in forward() except while training. It has special logic which performs
# evaluation using quantized values when it detects that it is being run in eval() mode, which will be substantially
# more lossy (but useful for determining network performance).
def forward(
self,
img
):
logits = self.encoder(img).permute((0,2,3,1) if len(img.shape) == 4 else (0,2,1))
sampled, codes, commitment_loss = self.quantizer(logits)
sampled = sampled.permute((0,3,1,2) if len(img.shape) == 4 else (0,2,1))
if self.training:
out = sampled
for d in self.decoder:
out = d(out)
else:
# This is non-differentiable, but gives a better idea of how the network is actually performing.
out, _ = self.decode(codes)
# reconstruction loss
recon_loss = self.loss_fn(img, out, reduction='none')
# This is so we can debug the distribution of codes being learned.
self.log_codes(codes)
return recon_loss, commitment_loss, out
def log_codes(self, codes):
# This is so we can debug the distribution of codes being learned.
if self.record_codes and self.internal_step % 50 == 0:
codes = codes.flatten()
l = codes.shape[0]
i = self.code_ind if (self.codes.shape[0] - self.code_ind) > l else self.codes.shape[0] - l
self.codes[i:i+l] = codes.cpu()
self.code_ind = self.code_ind + l
if self.code_ind >= self.codes.shape[0]:
self.code_ind = 0
self.internal_step += 1
@register_model
def register_dvae(opt_net, opt):
return DiscreteVAE(**opt_get(opt_net, ['kwargs'], {}))
if __name__ == '__main__':
#v = DiscreteVAE()
#o=v(torch.randn(1,3,256,256))
#print(o.shape)
v = DiscreteVAE(channels=80, positional_dims=1, num_tokens=4096, codebook_dim=1024,
hidden_dim=512, stride=2, num_resnet_blocks=2, kernel_size=3, num_layers=2,
quantizer_codebook_embedding_compression=64)
#v.eval()
loss, commitment, out = v(torch.randn(1,80,256))
print(out.shape)
codes = v.get_codebook_indices(torch.randn(1,80,256))
back, back_emb = v.decode(codes)
print(back.shape)

View File

@ -0,0 +1,245 @@
import torch
from torch import nn, einsum
import torch.nn.functional as F
from einops import rearrange, repeat
from models.arch_util import l2norm, sample_vectors, default, ema_inplace
def kmeans(samples, num_clusters, num_iters = 10, use_cosine_sim = False):
dim, dtype, device = samples.shape[-1], samples.dtype, samples.device
means = sample_vectors(samples, num_clusters)
for _ in range(num_iters):
if use_cosine_sim:
dists = samples @ means.t()
else:
diffs = rearrange(samples, 'n d -> n () d') - rearrange(means, 'c d -> () c d')
dists = -(diffs ** 2).sum(dim = -1)
buckets = dists.max(dim = -1).indices
bins = torch.bincount(buckets, minlength = num_clusters)
zero_mask = bins == 0
bins = bins.masked_fill(zero_mask, 1)
new_means = buckets.new_zeros(num_clusters, dim, dtype = dtype)
new_means.scatter_add_(0, repeat(buckets, 'n -> n d', d = dim), samples)
new_means = new_means / bins[..., None]
if use_cosine_sim:
new_means = l2norm(new_means)
means = torch.where(zero_mask[..., None], means, new_means)
return means
# distance types
class EuclideanCodebook(nn.Module):
def __init__(
self,
dim,
codebook_size,
kmeans_init = False,
kmeans_iters = 10,
decay = 0.8,
eps = 1e-5
):
super().__init__()
self.decay = decay
init_fn = torch.randn if not kmeans_init else torch.zeros
embed = init_fn(codebook_size, dim)
self.codebook_size = codebook_size
self.kmeans_iters = kmeans_iters
self.eps = eps
self.register_buffer('initted', torch.Tensor([not kmeans_init]))
self.register_buffer('cluster_size', torch.zeros(codebook_size))
self.register_buffer('embed', embed)
self.register_buffer('embed_avg', embed.clone())
def init_embed_(self, data):
embed = kmeans(data, self.codebook_size, self.kmeans_iters)
self.embed.data.copy_(embed)
self.embed_avg.data.copy_(embed.clone())
self.initted.data.copy_(torch.Tensor([True]))
def replace(self, samples, mask):
modified_codebook = torch.where(mask[..., None], sample_vectors(samples, self.codebook_size), self.embed)
self.embed.data.copy_(modified_codebook)
def forward(self, x):
shape, dtype = x.shape, x.dtype
flatten = rearrange(x, '... d -> (...) d')
embed = self.embed.t()
if not self.initted:
self.init_embed_(flatten)
dist = -(
flatten.pow(2).sum(1, keepdim=True)
- 2 * flatten @ embed
+ embed.pow(2).sum(0, keepdim=True)
)
embed_ind = dist.max(dim = -1).indices
embed_onehot = F.one_hot(embed_ind, self.codebook_size).type(x.dtype)
embed_ind = embed_ind.view(*shape[:-1])
quantize = F.embedding(embed_ind, self.embed)
if self.training:
ema_inplace(self.cluster_size, embed_onehot.sum(0), self.decay)
embed_sum = flatten.t() @ embed_onehot
ema_inplace(self.embed_avg, embed_sum.t(), self.decay)
cluster_size = laplace_smoothing(self.cluster_size, self.codebook_size, self.eps) * self.cluster_size.sum()
embed_normalized = self.embed_avg / cluster_size.unsqueeze(1)
self.embed.data.copy_(embed_normalized)
return quantize, embed_ind
class CosineSimCodebook(nn.Module):
def __init__(
self,
dim,
codebook_size,
kmeans_init = False,
kmeans_iters = 10,
decay = 0.8,
eps = 1e-5
):
super().__init__()
self.decay = decay
if not kmeans_init:
embed = l2norm(torch.randn(codebook_size, dim))
else:
embed = torch.zeros(codebook_size, dim)
self.codebook_size = codebook_size
self.kmeans_iters = kmeans_iters
self.eps = eps
self.register_buffer('initted', torch.Tensor([not kmeans_init]))
self.register_buffer('embed', embed)
def init_embed_(self, data):
embed = kmeans(data, self.codebook_size, self.kmeans_iters, use_cosine_sim = True)
self.embed.data.copy_(embed)
self.initted.data.copy_(torch.Tensor([True]))
def replace(self, samples, mask):
samples = l2norm(samples)
modified_codebook = torch.where(mask[..., None], sample_vectors(samples, self.codebook_size), self.embed)
self.embed.data.copy_(modified_codebook)
def forward(self, x):
shape, dtype = x.shape, x.dtype
flatten = rearrange(x, '... d -> (...) d')
flatten = l2norm(flatten)
if not self.initted:
self.init_embed_(flatten)
embed = l2norm(self.embed)
dist = flatten @ embed.t()
embed_ind = dist.max(dim = -1).indices
embed_onehot = F.one_hot(embed_ind, self.codebook_size).type(dtype)
embed_ind = embed_ind.view(*shape[:-1])
quantize = F.embedding(embed_ind, self.embed)
if self.training:
bins = embed_onehot.sum(0)
zero_mask = (bins == 0)
bins = bins.masked_fill(zero_mask, 1.)
embed_sum = flatten.t() @ embed_onehot
embed_normalized = (embed_sum / bins.unsqueeze(0)).t()
embed_normalized = l2norm(embed_normalized)
embed_normalized = torch.where(zero_mask[..., None], embed, embed_normalized)
ema_inplace(self.embed, embed_normalized, self.decay)
return quantize, embed_ind
# main class
class VectorQuantize(nn.Module):
def __init__(
self,
dim,
codebook_size,
n_embed = None,
codebook_dim = None,
decay = 0.8,
eps = 1e-5,
kmeans_init = False,
kmeans_iters = 10,
use_cosine_sim = False,
max_codebook_misses_before_expiry = 0
):
super().__init__()
n_embed = default(n_embed, codebook_size)
codebook_dim = default(codebook_dim, dim)
requires_projection = codebook_dim != dim
self.project_in = nn.Linear(dim, codebook_dim) if requires_projection else nn.Identity()
self.project_out = nn.Linear(codebook_dim, dim) if requires_projection else nn.Identity()
self.eps = eps
klass = EuclideanCodebook if not use_cosine_sim else CosineSimCodebook
self._codebook = klass(
dim = codebook_dim,
codebook_size = n_embed,
kmeans_init = kmeans_init,
kmeans_iters = kmeans_iters,
decay = decay,
eps = eps
)
self.codebook_size = codebook_size
self.max_codebook_misses_before_expiry = max_codebook_misses_before_expiry
if max_codebook_misses_before_expiry > 0:
codebook_misses = torch.zeros(codebook_size)
self.register_buffer('codebook_misses', codebook_misses)
@property
def codebook(self):
return self._codebook.codebook
def decode(self, codes):
unembed = F.embedding(codes, self._codebook.embed)
return self.project_out(unembed)
def expire_codes_(self, embed_ind, batch_samples):
if self.max_codebook_misses_before_expiry == 0:
return
embed_ind = rearrange(embed_ind, '... -> (...)')
misses = torch.bincount(embed_ind, minlength = self.codebook_size) == 0
self.codebook_misses += misses
expired_codes = self.codebook_misses >= self.max_codebook_misses_before_expiry
if not torch.any(expired_codes):
return
self.codebook_misses.masked_fill_(expired_codes, 0)
batch_samples = rearrange(batch_samples, '... d -> (...) d')
self._codebook.replace(batch_samples, mask = expired_codes)
def forward(self, x):
x = self.project_in(x)
quantize, embed_ind = self._codebook(x)
commit_loss = F.mse_loss(quantize.detach(), x)
if self.training:
quantize = x + (quantize - x).detach()
self.expire_codes_(embed_ind, x)
quantize = self.project_out(quantize)
return quantize, embed_ind, commit_loss