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commons.py
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commons.py
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import math
import numpy as np
import torch
from torch import nn
from torch.nn import functional as F
from torch import _weight_norm, norm_except_dim
from torch.nn.parameter import Parameter
def weight_norm(module:nn.Module, name='weight',dim=0):
if name + "_g" not in module._parameters.keys():
weight = getattr(module,name)
module.register_parameter(name + '_g', Parameter(norm_except_dim(weight, 2, dim).data))
module.register_parameter(name + '_v', Parameter(weight.data))
g = getattr(module, name + '_g')
v = getattr(module, name + '_v')
module.weight = Parameter(_weight_norm(v, g, dim))
return module
def init_weights(m, mean=0.0, std=0.01):
classname = m.__class__.__name__
if classname.find("Conv") != -1:
m.weight.data.normal_(mean, std)
def get_padding(kernel_size, dilation=1):
return int((kernel_size*dilation - dilation)/2)
def convert_pad_shape(pad_shape):
l = pad_shape[::-1]
pad_shape = [item for sublist in l for item in sublist]
return pad_shape
def intersperse(lst, item):
result = [item] * (len(lst) * 2 + 1)
result[1::2] = lst
return result
def kl_divergence(m_p, logs_p, m_q, logs_q):
"""KL(P||Q)"""
kl = (logs_q - logs_p) - 0.5
kl += 0.5 * (torch.exp(2. * logs_p) + ((m_p - m_q)**2)) * torch.exp(-2. * logs_q)
return kl
def rand_gumbel(shape):
"""Sample from the Gumbel distribution, protect from overflows."""
uniform_samples = torch.rand(shape) * 0.99998 + 0.00001
return -torch.log(-torch.log(uniform_samples))
def rand_gumbel_like(x):
g = rand_gumbel(x.size()).to(dtype=x.dtype, device=x.device)
return g
def slice_segments(x, ids_str, segment_size=4):
ret = torch.zeros_like(x[:, :, :segment_size])
for i in range(x.size(0)):
idx_str = ids_str[i]
idx_end = idx_str + segment_size
ret[i] = x[i, :, idx_str:idx_end]
return ret
def rand_slice_segments(x, x_lengths=None, segment_size=4):
b, d, t = x.size()
if x_lengths is None:
x_lengths = t
ids_str_max = x_lengths - segment_size + 1
ids_str = (torch.rand([b]).to(device=x.device) * ids_str_max).to(dtype=torch.long)
ret = slice_segments(x, ids_str, segment_size)
return ret, ids_str
def get_timing_signal_1d(
length, channels, min_timescale=1.0, max_timescale=1.0e4):
position = torch.arange(length, dtype=torch.float)
num_timescales = channels // 2
log_timescale_increment = (
math.log(float(max_timescale) / float(min_timescale)) /
(num_timescales - 1))
inv_timescales = min_timescale * torch.exp(
torch.arange(num_timescales, dtype=torch.float) * -log_timescale_increment)
scaled_time = position.unsqueeze(0) * inv_timescales.unsqueeze(1)
signal = torch.cat([torch.sin(scaled_time), torch.cos(scaled_time)], 0)
signal = F.pad(signal, [0, 0, 0, channels % 2])
signal = signal.view(1, channels, length)
return signal
def add_timing_signal_1d(x, min_timescale=1.0, max_timescale=1.0e4):
b, channels, length = x.size()
signal = get_timing_signal_1d(length, channels, min_timescale, max_timescale)
return x + signal.to(dtype=x.dtype, device=x.device)
def cat_timing_signal_1d(x, min_timescale=1.0, max_timescale=1.0e4, axis=1):
b, channels, length = x.size()
signal = get_timing_signal_1d(length, channels, min_timescale, max_timescale)
return torch.cat([x, signal.to(dtype=x.dtype, device=x.device)], axis)
def subsequent_mask(length):
mask = torch.tril(torch.ones(length, length)).unsqueeze(0).unsqueeze(0)
return mask
def fused_add_tanh_sigmoid_multiply(input_a, input_b, n_channels):
in_act = input_a + input_b.expand_as(input_a) # important
t_act = torch.tanh(in_act[:, :n_channels, :])
s_act = torch.sigmoid(in_act[:, n_channels:, :])
acts = t_act * s_act
return acts
def convert_pad_shape(pad_shape):
l = pad_shape[::-1]
pad_shape = [item for sublist in l for item in sublist]
return pad_shape
def shift_1d(x):
x = F.pad(x, convert_pad_shape([[0, 0], [0, 0], [1, 0]]))[:, :, :-1]
return x
def sequence_mask(length, max_length=None):
if max_length is None:
max_length = length.max()
x = torch.arange(max_length, dtype=length.dtype, device=length.device)
return x.unsqueeze(0) < length.unsqueeze(1)
def mask_value(a, mask, value):
new_mask = mask * -a + value
return new_mask + a
def masked_tensor(a, mask):
size = mask.sum()
masked = torch.zeros(size)
new_a = (a * mask).flatten()
for i, t in enumerate(new_a):
if t: masked[i] = t
return masked
def softplus(x: torch.Tensor):
x = x.exp() + 1
x = x.log()
return x
def softmax(x: torch.Tensor, axis=-1):
bottom = x.exp().sum(axis)
bottom = bottom.unsqueeze(-1)
return x.exp() / bottom.expand_as(x)
def gather(x, index, axis=-1):
onehot = np.eye(x.size(1))[index.detach().numpy()]
onehot = torch.from_numpy(onehot)
onehot = onehot * x
onehot = onehot.sum(axis)
return onehot
def generate_path(duration, mask):
"""
duration: [b, 1, t_x]
mask: [b, 1, t_y, t_x]
"""
device = duration.device
b, _, t_y, t_x = mask.shape
cum_duration = torch.cumsum(duration, -1)
cum_duration_flat = cum_duration.view(b * t_x)
path = sequence_mask(cum_duration_flat, t_y).to(mask.dtype)
path = path.view(b, t_x, t_y)
path = path.float() - F.pad(path, convert_pad_shape([[0, 0], [1, 0], [0, 0]]))[:, :-1].float()
path = path.unsqueeze(1).transpose(2,3) * mask
return path