355 lines
12 KiB
Python
355 lines
12 KiB
Python
import torch
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import torch.nn as nn
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from torch import Tensor
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import torch.nn.init as init
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import torch.nn.functional as F
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EPS = 1e-8
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class GlobalLayerNorm(nn.Module):
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"""Calculate Global Layer Normalization.
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Arguments
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---------
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dim : (int or list or torch.Size)
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Input shape from an expected input of size.
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eps : float
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A value added to the denominator for numerical stability.
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elementwise_affine : bool
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A boolean value that when set to True,
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this module has learnable per-element affine parameters
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initialized to ones (for weights) and zeros (for biases).
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Example
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-------
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>>> x = torch.randn(5, 10, 20)
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>>> GLN = GlobalLayerNorm(10, 3)
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>>> x_norm = GLN(x)
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"""
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def __init__(self, dim, shape, eps=1e-8, elementwise_affine=True):
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super(GlobalLayerNorm, self).__init__()
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self.dim = dim
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self.eps = eps
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self.elementwise_affine = elementwise_affine
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if self.elementwise_affine:
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if shape == 3:
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self.weight = nn.Parameter(torch.ones(self.dim, 1))
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self.bias = nn.Parameter(torch.zeros(self.dim, 1))
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if shape == 4:
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self.weight = nn.Parameter(torch.ones(self.dim, 1, 1))
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self.bias = nn.Parameter(torch.zeros(self.dim, 1, 1))
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else:
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self.register_parameter("weight", None)
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self.register_parameter("bias", None)
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def forward(self, x):
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"""Returns the normalized tensor.
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Arguments
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---------
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x : torch.Tensor
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Tensor of size [N, C, K, S] or [N, C, L].
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"""
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# x = N x C x K x S or N x C x L
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# N x 1 x 1
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# cln: mean,var N x 1 x K x S
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# gln: mean,var N x 1 x 1
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if x.dim() == 3:
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mean = torch.mean(x, (1, 2), keepdim=True)
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var = torch.mean((x - mean) ** 2, (1, 2), keepdim=True)
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if self.elementwise_affine:
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x = (
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self.weight * (x - mean) / torch.sqrt(var + self.eps)
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+ self.bias
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)
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else:
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x = (x - mean) / torch.sqrt(var + self.eps)
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if x.dim() == 4:
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mean = torch.mean(x, (1, 2, 3), keepdim=True)
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var = torch.mean((x - mean) ** 2, (1, 2, 3), keepdim=True)
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if self.elementwise_affine:
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x = (
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self.weight * (x - mean) / torch.sqrt(var + self.eps)
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+ self.bias
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)
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else:
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x = (x - mean) / torch.sqrt(var + self.eps)
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return x
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class CumulativeLayerNorm(nn.LayerNorm):
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"""Calculate Cumulative Layer Normalization.
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Arguments
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---------
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dim : int
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Dimension that you want to normalize.
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elementwise_affine : True
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Learnable per-element affine parameters.
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Example
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-------
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>>> x = torch.randn(5, 10, 20)
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>>> CLN = CumulativeLayerNorm(10)
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>>> x_norm = CLN(x)
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"""
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def __init__(self, dim, elementwise_affine=True):
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super(CumulativeLayerNorm, self).__init__(
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dim, elementwise_affine=elementwise_affine, eps=1e-8
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)
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def forward(self, x):
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"""Returns the normalized tensor.
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Arguments
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---------
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x : torch.Tensor
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Tensor size [N, C, K, S] or [N, C, L]
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"""
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# x: N x C x K x S or N x C x L
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# N x K x S x C
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if x.dim() == 4:
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x = x.permute(0, 2, 3, 1).contiguous()
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# N x K x S x C == only channel norm
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x = super().forward(x)
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# N x C x K x S
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x = x.permute(0, 3, 1, 2).contiguous()
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if x.dim() == 3:
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x = torch.transpose(x, 1, 2)
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# N x L x C == only channel norm
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x = super().forward(x)
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# N x C x L
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x = torch.transpose(x, 1, 2)
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return x
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def select_norm(norm, dim, shape):
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"""Just a wrapper to select the normalization type.
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"""
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if norm == "gln":
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return GlobalLayerNorm(dim, shape, elementwise_affine=True)
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if norm == "cln":
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return CumulativeLayerNorm(dim, elementwise_affine=True)
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if norm == "ln":
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return nn.GroupNorm(1, dim, eps=1e-8)
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else:
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return nn.BatchNorm1d(dim)
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class Swish(nn.Module):
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"""
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Swish is a smooth, non-monotonic function that consistently matches or outperforms ReLU on deep networks applied
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to a variety of challenging domains such as Image classification and Machine translation.
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"""
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def __init__(self):
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super(Swish, self).__init__()
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def forward(self, inputs: Tensor) -> Tensor:
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return inputs * inputs.sigmoid()
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class GLU(nn.Module):
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"""
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The gating mechanism is called Gated Linear Units (GLU), which was first introduced for natural language processing
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in the paper “Language Modeling with Gated Convolutional Networks”
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"""
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def __init__(self, dim: int) -> None:
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super(GLU, self).__init__()
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self.dim = dim
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def forward(self, inputs: Tensor) -> Tensor:
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outputs, gate = inputs.chunk(2, dim=self.dim)
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return outputs * gate.sigmoid()
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class Transpose(nn.Module):
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""" Wrapper class of torch.transpose() for Sequential module. """
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def __init__(self, shape: tuple):
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super(Transpose, self).__init__()
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self.shape = shape
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def forward(self, x: Tensor) -> Tensor:
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return x.transpose(*self.shape)
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class Linear(nn.Module):
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"""
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Wrapper class of torch.nn.Linear
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Weight initialize by xavier initialization and bias initialize to zeros.
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"""
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def __init__(self, in_features: int, out_features: int, bias: bool = True) -> None:
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super(Linear, self).__init__()
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self.linear = nn.Linear(in_features, out_features, bias=bias)
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init.xavier_uniform_(self.linear.weight)
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if bias:
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init.zeros_(self.linear.bias)
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def forward(self, x: Tensor) -> Tensor:
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return self.linear(x)
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class DepthwiseConv1d(nn.Module):
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"""
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When groups == in_channels and out_channels == K * in_channels, where K is a positive integer,
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this operation is termed in literature as depthwise convolution.
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Args:
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in_channels (int): Number of channels in the input
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out_channels (int): Number of channels produced by the convolution
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kernel_size (int or tuple): Size of the convolving kernel
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stride (int, optional): Stride of the convolution. Default: 1
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padding (int or tuple, optional): Zero-padding added to both sides of the input. Default: 0
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bias (bool, optional): If True, adds a learnable bias to the output. Default: True
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Inputs: inputs
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- **inputs** (batch, in_channels, time): Tensor containing input vector
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Returns: outputs
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- **outputs** (batch, out_channels, time): Tensor produces by depthwise 1-D convolution.
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"""
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def __init__(
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self,
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in_channels: int,
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out_channels: int,
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kernel_size: int,
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stride: int = 1,
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padding: int = 0,
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bias: bool = False,
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) -> None:
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super(DepthwiseConv1d, self).__init__()
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assert out_channels % in_channels == 0, "out_channels should be constant multiple of in_channels"
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self.conv = nn.Conv1d(
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in_channels=in_channels,
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out_channels=out_channels,
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kernel_size=kernel_size,
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groups=in_channels,
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stride=stride,
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padding=padding,
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bias=bias,
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)
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def forward(self, inputs: Tensor) -> Tensor:
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return self.conv(inputs)
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class PointwiseConv1d(nn.Module):
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"""
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When kernel size == 1 conv1d, this operation is termed in literature as pointwise convolution.
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This operation often used to match dimensions.
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Args:
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in_channels (int): Number of channels in the input
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out_channels (int): Number of channels produced by the convolution
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stride (int, optional): Stride of the convolution. Default: 1
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padding (int or tuple, optional): Zero-padding added to both sides of the input. Default: 0
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bias (bool, optional): If True, adds a learnable bias to the output. Default: True
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Inputs: inputs
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- **inputs** (batch, in_channels, time): Tensor containing input vector
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Returns: outputs
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- **outputs** (batch, out_channels, time): Tensor produces by pointwise 1-D convolution.
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"""
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def __init__(
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self,
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in_channels: int,
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out_channels: int,
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stride: int = 1,
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padding: int = 0,
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bias: bool = True,
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) -> None:
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super(PointwiseConv1d, self).__init__()
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self.conv = nn.Conv1d(
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in_channels=in_channels,
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out_channels=out_channels,
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kernel_size=1,
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stride=stride,
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padding=padding,
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bias=bias,
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)
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def forward(self, inputs: Tensor) -> Tensor:
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return self.conv(inputs)
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class ConvModule(nn.Module):
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"""
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Modified from Conformer convolution module to perform depth-wise convolution
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Args:
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in_channels (int): Number of channels in the input
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kernel_size (int or tuple, optional): Size of the convolving kernel Default: 31
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dropout_p (float, optional): probability of dropout
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Inputs: inputs
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inputs (batch, time, dim): Tensor contains input sequences
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Outputs: outputs
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outputs (batch, time, dim): Tensor produces by conformer convolution module.
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"""
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def __init__(
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self,
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in_channels: int,
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kernel_size: int = 17,
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expansion_factor: int = 2,
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dropout_p: float = 0.1,
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) -> None:
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super(ConvModule, self).__init__()
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assert (kernel_size - 1) % 2 == 0, "kernel_size should be a odd number for 'SAME' padding"
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assert expansion_factor == 2, "Currently, Only Supports expansion_factor 2"
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self.sequential = nn.Sequential(
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Transpose(shape=(1, 2)),
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DepthwiseConv1d(in_channels, in_channels, kernel_size, stride=1, padding=(kernel_size - 1) // 2),
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)
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def forward(self, inputs: Tensor) -> Tensor:
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return inputs + self.sequential(inputs).transpose(1, 2)
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class DilatedDenseNet(nn.Module):
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def __init__(self, depth=4, lorder=20, in_channels=64):
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super(DilatedDenseNet, self).__init__()
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self.depth = depth
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self.in_channels = in_channels
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self.pad = nn.ConstantPad2d((1, 1, 1, 0), value=0.)
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self.twidth = lorder*2-1
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self.kernel_size = (self.twidth, 1)
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for i in range(self.depth):
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dil = 2 ** i
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pad_length = lorder + (dil - 1) * (lorder - 1) - 1
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setattr(self, 'pad{}'.format(i + 1), nn.ConstantPad2d((0, 0, pad_length, pad_length), value=0.))
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setattr(self, 'conv{}'.format(i + 1),
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nn.Conv2d(self.in_channels*(i+1), self.in_channels, kernel_size=self.kernel_size,
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dilation=(dil, 1), groups=self.in_channels, bias=False))
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setattr(self, 'norm{}'.format(i + 1), nn.InstanceNorm2d(in_channels, affine=True))
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setattr(self, 'prelu{}'.format(i + 1), nn.PReLU(self.in_channels))
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def forward(self, x):
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x = torch.unsqueeze(x, 1)
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x_per = x.permute(0, 3, 2, 1)
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skip = x_per
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for i in range(self.depth):
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out = getattr(self, 'pad{}'.format(i + 1))(skip)
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out = getattr(self, 'conv{}'.format(i + 1))(out)
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out = getattr(self, 'norm{}'.format(i + 1))(out)
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out = getattr(self, 'prelu{}'.format(i + 1))(out)
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skip = torch.cat([out, skip], dim=1)
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out1 = out.permute(0, 3, 2, 1)
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return out1.squeeze(1)
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class FFConvM_Dilated(nn.Module):
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def __init__(
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self,
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dim_in,
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dim_out,
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norm_klass = nn.LayerNorm,
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dropout = 0.1
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):
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super().__init__()
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self.mdl = nn.Sequential(
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norm_klass(dim_in),
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nn.Linear(dim_in, dim_out),
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nn.SiLU(),
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DilatedDenseNet(depth=2, lorder=17, in_channels=dim_out),
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nn.Dropout(dropout)
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)
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def forward(
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self,
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x,
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):
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output = self.mdl(x)
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return output
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