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model.py
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model.py
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# MIT License
#
# Copyright (c) 2022 Tada Makepeace
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
import torch.nn as nn
import torch.nn.functional as F
class CNNLayerNorm(nn.Module):
"""Layer normalization built for cnns input"""
def __init__(self, n_feats):
super(CNNLayerNorm, self).__init__()
self.layer_norm = nn.LayerNorm(n_feats)
def forward(self, x):
# x (batch, channel, feature, time)
x = x.transpose(2, 3).contiguous() # (batch, channel, time, feature)
x = self.layer_norm(x)
return x.transpose(2, 3).contiguous() # (batch, channel, feature, time)
class ResidualCNN(nn.Module):
"""Residual CNN inspired by https://arxiv.org/pdf/1603.05027.pdf
except with layer norm instead of batch norm
"""
def __init__(self, in_channels, out_channels, kernel, stride, dropout, n_feats):
super(ResidualCNN, self).__init__()
self.cnn1 = nn.Conv2d(in_channels, out_channels, kernel, stride, padding=kernel//2)
self.cnn2 = nn.Conv2d(out_channels, out_channels, kernel, stride, padding=kernel//2)
self.dropout1 = nn.Dropout(dropout)
self.dropout2 = nn.Dropout(dropout)
self.layer_norm1 = CNNLayerNorm(n_feats)
self.layer_norm2 = CNNLayerNorm(n_feats)
def forward(self, x):
residual = x # (batch, channel, feature, time)
x = self.layer_norm1(x)
x = F.gelu(x)
x = self.dropout1(x)
x = self.cnn1(x)
x = self.layer_norm2(x)
x = F.gelu(x)
x = self.dropout2(x)
x = self.cnn2(x)
x += residual
return x # (batch, channel, feature, time)
class BidirectionalGRU(nn.Module):
def __init__(self, rnn_dim, hidden_size, dropout, batch_first):
super(BidirectionalGRU, self).__init__()
self.BiGRU = nn.GRU(
input_size=rnn_dim, hidden_size=hidden_size,
num_layers=1, batch_first=batch_first, bidirectional=True)
self.layer_norm = nn.LayerNorm(rnn_dim)
self.dropout = nn.Dropout(dropout)
def forward(self, x):
x = self.layer_norm(x)
x = F.gelu(x)
x, _ = self.BiGRU(x)
x = self.dropout(x)
return x
class SpeechRecognitionModel(nn.Module):
"""Modern version of the DeepSpeech2 from Michael Nguyen, Machine
Learning Research Engineer at AssemblyAI and Niko Laskaris at Comet.ml"""
def __init__(self, n_cnn_layers, n_rnn_layers, rnn_dim, n_class, n_feats, stride=2, dropout=0.1):
super(SpeechRecognitionModel, self).__init__()
n_feats = n_feats//2
self.cnn = nn.Conv2d(1, 32, 3, stride=stride, padding=3//2) # cnn for extracting heirachal features
# n residual cnn layers with filter size of 32
self.rescnn_layers = nn.Sequential(*[
ResidualCNN(32, 32, kernel=3, stride=1, dropout=dropout, n_feats=n_feats)
for _ in range(n_cnn_layers)
])
self.fully_connected = nn.Linear(n_feats*32, rnn_dim)
self.birnn_layers = nn.Sequential(*[
BidirectionalGRU(rnn_dim=rnn_dim if i==0 else rnn_dim*2,
hidden_size=rnn_dim, dropout=dropout, batch_first=i==0)
for i in range(n_rnn_layers)
])
self.classifier = nn.Sequential(
nn.Linear(rnn_dim*2, rnn_dim), # birnn returns rnn_dim*2
nn.GELU(),
nn.Dropout(dropout),
nn.Linear(rnn_dim, n_class)
)
def forward(self, x):
# print("PRE MODEL INPUT SHAPE:", x.shape)
x = self.cnn(x)
x = self.rescnn_layers(x)
# print("POST MODEL INPUT SHAPE:", x.shape)
sizes = x.size()
x = x.view(sizes[0], sizes[1] * sizes[2], sizes[3]) # (batch, feature, time)
# print("VIEWED MODEL INPUT SHAPE:", x.shape)
x = x.transpose(1, 2) # (batch, time, feature)
x = self.fully_connected(x)
x = self.birnn_layers(x)
x = self.classifier(x)
# print("POST-SEQ SHAPE:", x.shape)
return x