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import numpy as np
import torch
import torch.distributions as dist
from torch import nn
from modules.commons.conv import ConditionalConvBlocks
from modules.commons.normalizing_flow.res_flow import ResFlow
from modules.commons.wavenet import WN
class FVAEEncoder(nn.Module):
def __init__(self, c_in, hidden_size, c_latent, kernel_size,
n_layers, c_cond=0, p_dropout=0, strides=[4], nn_type='wn'):
super().__init__()
self.strides = strides
self.hidden_size = hidden_size
if np.prod(strides) == 1:
self.pre_net = nn.Conv1d(c_in, hidden_size, kernel_size=1)
else:
self.pre_net = nn.Sequential(*[
nn.Conv1d(c_in, hidden_size, kernel_size=s * 2, stride=s, padding=s // 2)
if i == 0 else
nn.Conv1d(hidden_size, hidden_size, kernel_size=s * 2, stride=s, padding=s // 2)
for i, s in enumerate(strides)
])
if nn_type == 'wn':
self.nn = WN(hidden_size, kernel_size, 1, n_layers, c_cond, p_dropout)
elif nn_type == 'conv':
self.nn = ConditionalConvBlocks(
hidden_size, c_cond, hidden_size, None, kernel_size,
layers_in_block=2, is_BTC=False, num_layers=n_layers)
self.out_proj = nn.Conv1d(hidden_size, c_latent * 2, 1)
self.latent_channels = c_latent
def forward(self, x, nonpadding, cond):
x = self.pre_net(x)
nonpadding = nonpadding[:, :, ::np.prod(self.strides)][:, :, :x.shape[-1]]
x = x * nonpadding
x = self.nn(x, nonpadding=nonpadding, cond=cond) * nonpadding
x = self.out_proj(x)
m, logs = torch.split(x, self.latent_channels, dim=1)
z = (m + torch.randn_like(m) * torch.exp(logs))
return z, m, logs, nonpadding
class FVAEDecoder(nn.Module):
def __init__(self, c_latent, hidden_size, out_channels, kernel_size,
n_layers, c_cond=0, p_dropout=0, strides=[4], nn_type='wn'):
super().__init__()
self.strides = strides
self.hidden_size = hidden_size
self.pre_net = nn.Sequential(*[
nn.ConvTranspose1d(c_latent, hidden_size, kernel_size=s, stride=s)
if i == 0 else
nn.ConvTranspose1d(hidden_size, hidden_size, kernel_size=s, stride=s)
for i, s in enumerate(strides)
])
if nn_type == 'wn':
self.nn = WN(hidden_size, kernel_size, 1, n_layers, c_cond, p_dropout)
elif nn_type == 'conv':
self.nn = ConditionalConvBlocks(
hidden_size, c_cond, hidden_size, [1] * n_layers, kernel_size,
layers_in_block=2, is_BTC=False)
self.out_proj = nn.Conv1d(hidden_size, out_channels, 1)
def forward(self, x, nonpadding, cond):
x = self.pre_net(x)
x = x * nonpadding
x = self.nn(x, nonpadding=nonpadding, cond=cond) * nonpadding
x = self.out_proj(x)
return x
class FVAE(nn.Module):
def __init__(self,
c_in_out, hidden_size, c_latent,
kernel_size, enc_n_layers, dec_n_layers, c_cond, strides,
use_prior_flow, flow_hidden=None, flow_kernel_size=None, flow_n_steps=None,
encoder_type='wn', decoder_type='wn'):
super(FVAE, self).__init__()
self.strides = strides
self.hidden_size = hidden_size
self.latent_size = c_latent
self.use_prior_flow = use_prior_flow
if np.prod(strides) == 1:
self.g_pre_net = nn.Conv1d(c_cond, c_cond, kernel_size=1)
else:
self.g_pre_net = nn.Sequential(*[
nn.Conv1d(c_cond, c_cond, kernel_size=s * 2, stride=s, padding=s // 2)
for i, s in enumerate(strides)
])
self.encoder = FVAEEncoder(c_in_out, hidden_size, c_latent, kernel_size,
enc_n_layers, c_cond, strides=strides, nn_type=encoder_type)
if use_prior_flow:
self.prior_flow = ResFlow(
c_latent, flow_hidden, flow_kernel_size, flow_n_steps, 4, c_cond=c_cond)
self.decoder = FVAEDecoder(c_latent, hidden_size, c_in_out, kernel_size,
dec_n_layers, c_cond, strides=strides, nn_type=decoder_type)
self.prior_dist = dist.Normal(0, 1)
def forward(self, x=None, nonpadding=None, cond=None, infer=False, noise_scale=1.0):
"""
:param x: [B, C_in_out, T]
:param nonpadding: [B, 1, T]
:param cond: [B, C_g, T]
:return:
"""
if nonpadding is None:
nonpadding = 1
cond_sqz = self.g_pre_net(cond)
if not infer:
z_q, m_q, logs_q, nonpadding_sqz = self.encoder(x, nonpadding, cond_sqz)
q_dist = dist.Normal(m_q, logs_q.exp())
if self.use_prior_flow:
logqx = q_dist.log_prob(z_q)
z_p = self.prior_flow(z_q, nonpadding_sqz, cond_sqz)
logpx = self.prior_dist.log_prob(z_p)
loss_kl = ((logqx - logpx) * nonpadding_sqz).sum() / nonpadding_sqz.sum() / logqx.shape[1]
else:
loss_kl = torch.distributions.kl_divergence(q_dist, self.prior_dist)
loss_kl = (loss_kl * nonpadding_sqz).sum() / nonpadding_sqz.sum() / z_q.shape[1]
z_p = None
return z_q, loss_kl, z_p, m_q, logs_q
else:
latent_shape = [cond_sqz.shape[0], self.latent_size, cond_sqz.shape[2]]
z_p = torch.randn(latent_shape).to(cond.device) * noise_scale
if self.use_prior_flow:
z_p = self.prior_flow(z_p, 1, cond_sqz, reverse=True)
return z_p
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