223 lines
9.2 KiB
Python
223 lines
9.2 KiB
Python
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""" refer from https://github.com/zceng/LVCNet """
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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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class KernelPredictor(torch.nn.Module):
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''' Kernel predictor for the location-variable convolutions'''
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def __init__(
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self,
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cond_channels,
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conv_in_channels,
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conv_out_channels,
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conv_layers,
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conv_kernel_size=3,
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kpnet_hidden_channels=64,
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kpnet_conv_size=3,
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kpnet_dropout=0.0,
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kpnet_nonlinear_activation="LeakyReLU",
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kpnet_nonlinear_activation_params={"negative_slope": 0.1},
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):
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'''
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Args:
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cond_channels (int): number of channel for the conditioning sequence,
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conv_in_channels (int): number of channel for the input sequence,
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conv_out_channels (int): number of channel for the output sequence,
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conv_layers (int): number of layers
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'''
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super().__init__()
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self.conv_in_channels = conv_in_channels
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self.conv_out_channels = conv_out_channels
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self.conv_kernel_size = conv_kernel_size
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self.conv_layers = conv_layers
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kpnet_kernel_channels = conv_in_channels * conv_out_channels * conv_kernel_size * conv_layers # l_w
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kpnet_bias_channels = conv_out_channels * conv_layers # l_b
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self.input_conv = nn.Sequential(
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nn.utils.weight_norm(nn.Conv1d(cond_channels, kpnet_hidden_channels, 5, padding=2, bias=True)),
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getattr(nn, kpnet_nonlinear_activation)(**kpnet_nonlinear_activation_params),
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)
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self.residual_convs = nn.ModuleList()
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padding = (kpnet_conv_size - 1) // 2
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for _ in range(3):
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self.residual_convs.append(
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nn.Sequential(
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nn.Dropout(kpnet_dropout),
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nn.utils.weight_norm(
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nn.Conv1d(kpnet_hidden_channels, kpnet_hidden_channels, kpnet_conv_size, padding=padding,
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bias=True)),
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getattr(nn, kpnet_nonlinear_activation)(**kpnet_nonlinear_activation_params),
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nn.utils.weight_norm(
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nn.Conv1d(kpnet_hidden_channels, kpnet_hidden_channels, kpnet_conv_size, padding=padding,
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bias=True)),
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getattr(nn, kpnet_nonlinear_activation)(**kpnet_nonlinear_activation_params),
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)
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)
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self.kernel_conv = nn.utils.weight_norm(
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nn.Conv1d(kpnet_hidden_channels, kpnet_kernel_channels, kpnet_conv_size, padding=padding, bias=True))
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self.bias_conv = nn.utils.weight_norm(
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nn.Conv1d(kpnet_hidden_channels, kpnet_bias_channels, kpnet_conv_size, padding=padding, bias=True))
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def forward(self, c):
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'''
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Args:
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c (Tensor): the conditioning sequence (batch, cond_channels, cond_length)
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'''
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batch, _, cond_length = c.shape
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c = self.input_conv(c)
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for residual_conv in self.residual_convs:
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residual_conv.to(c.device)
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c = c + residual_conv(c)
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k = self.kernel_conv(c)
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b = self.bias_conv(c)
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kernels = k.contiguous().view(
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batch,
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self.conv_layers,
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self.conv_in_channels,
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self.conv_out_channels,
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self.conv_kernel_size,
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cond_length,
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)
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bias = b.contiguous().view(
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batch,
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self.conv_layers,
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self.conv_out_channels,
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cond_length,
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)
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return kernels, bias
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def remove_weight_norm(self):
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nn.utils.remove_weight_norm(self.input_conv[0])
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nn.utils.remove_weight_norm(self.kernel_conv)
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nn.utils.remove_weight_norm(self.bias_conv)
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for block in self.residual_convs:
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nn.utils.remove_weight_norm(block[1])
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nn.utils.remove_weight_norm(block[3])
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class LVCBlock(torch.nn.Module):
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'''the location-variable convolutions'''
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def __init__(
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self,
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in_channels,
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cond_channels,
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stride,
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dilations=[1, 3, 9, 27],
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lReLU_slope=0.2,
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conv_kernel_size=3,
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cond_hop_length=256,
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kpnet_hidden_channels=64,
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kpnet_conv_size=3,
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kpnet_dropout=0.0,
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):
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super().__init__()
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self.cond_hop_length = cond_hop_length
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self.conv_layers = len(dilations)
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self.conv_kernel_size = conv_kernel_size
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self.kernel_predictor = KernelPredictor(
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cond_channels=cond_channels,
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conv_in_channels=in_channels,
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conv_out_channels=2 * in_channels,
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conv_layers=len(dilations),
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conv_kernel_size=conv_kernel_size,
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kpnet_hidden_channels=kpnet_hidden_channels,
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kpnet_conv_size=kpnet_conv_size,
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kpnet_dropout=kpnet_dropout,
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kpnet_nonlinear_activation_params={"negative_slope": lReLU_slope}
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)
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self.convt_pre = nn.Sequential(
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nn.LeakyReLU(lReLU_slope),
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nn.utils.weight_norm(nn.ConvTranspose1d(in_channels, in_channels, 2 * stride, stride=stride,
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padding=stride // 2 + stride % 2, output_padding=stride % 2)),
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)
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self.conv_blocks = nn.ModuleList()
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for dilation in dilations:
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self.conv_blocks.append(
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nn.Sequential(
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nn.LeakyReLU(lReLU_slope),
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nn.utils.weight_norm(nn.Conv1d(in_channels, in_channels, conv_kernel_size,
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padding=dilation * (conv_kernel_size - 1) // 2, dilation=dilation)),
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nn.LeakyReLU(lReLU_slope),
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)
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)
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def forward(self, x, c):
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''' forward propagation of the location-variable convolutions.
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Args:
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x (Tensor): the input sequence (batch, in_channels, in_length)
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c (Tensor): the conditioning sequence (batch, cond_channels, cond_length)
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Returns:
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Tensor: the output sequence (batch, in_channels, in_length)
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'''
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_, in_channels, _ = x.shape # (B, c_g, L')
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x = self.convt_pre(x) # (B, c_g, stride * L')
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kernels, bias = self.kernel_predictor(c)
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for i, conv in enumerate(self.conv_blocks):
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output = conv(x) # (B, c_g, stride * L')
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k = kernels[:, i, :, :, :, :] # (B, 2 * c_g, c_g, kernel_size, cond_length)
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b = bias[:, i, :, :] # (B, 2 * c_g, cond_length)
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output = self.location_variable_convolution(output, k, b,
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hop_size=self.cond_hop_length) # (B, 2 * c_g, stride * L'): LVC
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x = x + torch.sigmoid(output[:, :in_channels, :]) * torch.tanh(
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output[:, in_channels:, :]) # (B, c_g, stride * L'): GAU
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return x
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def location_variable_convolution(self, x, kernel, bias, dilation=1, hop_size=256):
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''' perform location-variable convolution operation on the input sequence (x) using the local convolution kernl.
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Time: 414 μs ± 309 ns per loop (mean ± std. dev. of 7 runs, 1000 loops each), test on NVIDIA V100.
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Args:
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x (Tensor): the input sequence (batch, in_channels, in_length).
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kernel (Tensor): the local convolution kernel (batch, in_channel, out_channels, kernel_size, kernel_length)
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bias (Tensor): the bias for the local convolution (batch, out_channels, kernel_length)
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dilation (int): the dilation of convolution.
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hop_size (int): the hop_size of the conditioning sequence.
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Returns:
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(Tensor): the output sequence after performing local convolution. (batch, out_channels, in_length).
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'''
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batch, _, in_length = x.shape
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batch, _, out_channels, kernel_size, kernel_length = kernel.shape
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assert in_length == (kernel_length * hop_size), "length of (x, kernel) is not matched"
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padding = dilation * int((kernel_size - 1) / 2)
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x = F.pad(x, (padding, padding), 'constant', 0) # (batch, in_channels, in_length + 2*padding)
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x = x.unfold(2, hop_size + 2 * padding, hop_size) # (batch, in_channels, kernel_length, hop_size + 2*padding)
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if hop_size < dilation:
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x = F.pad(x, (0, dilation), 'constant', 0)
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x = x.unfold(3, dilation,
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dilation) # (batch, in_channels, kernel_length, (hop_size + 2*padding)/dilation, dilation)
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x = x[:, :, :, :, :hop_size]
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x = x.transpose(3, 4) # (batch, in_channels, kernel_length, dilation, (hop_size + 2*padding)/dilation)
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x = x.unfold(4, kernel_size, 1) # (batch, in_channels, kernel_length, dilation, _, kernel_size)
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o = torch.einsum('bildsk,biokl->bolsd', x, kernel)
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o = o.to(memory_format=torch.channels_last_3d)
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bias = bias.unsqueeze(-1).unsqueeze(-1).to(memory_format=torch.channels_last_3d)
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o = o + bias
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o = o.contiguous().view(batch, out_channels, -1)
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return o
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def remove_weight_norm(self):
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self.kernel_predictor.remove_weight_norm()
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nn.utils.remove_weight_norm(self.convt_pre[1])
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for block in self.conv_blocks:
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nn.utils.remove_weight_norm(block[1])
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