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"""This models.py contains selected models from:
https://github.com/qiuqiangkong/audioset_tagging_cnn/blob/master/pytorch/models.py
"""
#import os
#import sys
#import math
#import time
#import numpy as np
#import matplotlib.pyplot as plt
import torch
import torch.nn as nn
import torch.nn.functional as F
from torchlibrosa.stft import Spectrogram, LogmelFilterBank
from torchlibrosa.augmentation import SpecAugmentation
from .pytorch_utils import do_mixup, interpolate, pad_framewise_output
def init_layer(layer):
"""Initialize a Linear or Convolutional layer. """
nn.init.xavier_uniform_(layer.weight)
if hasattr(layer, 'bias'):
if layer.bias is not None:
layer.bias.data.fill_(0.)
def init_bn(bn):
"""Initialize a Batchnorm layer. """
bn.bias.data.fill_(0.)
bn.weight.data.fill_(1.)
class ConvBlock(nn.Module):
def __init__(self, in_channels, out_channels):
super(ConvBlock, self).__init__()
self.conv1 = nn.Conv2d(in_channels=in_channels,
out_channels=out_channels,
kernel_size=(3, 3), stride=(1, 1),
padding=(1, 1), bias=False)
self.conv2 = nn.Conv2d(in_channels=out_channels,
out_channels=out_channels,
kernel_size=(3, 3), stride=(1, 1),
padding=(1, 1), bias=False)
self.bn1 = nn.BatchNorm2d(out_channels)
self.bn2 = nn.BatchNorm2d(out_channels)
self.init_weight()
def init_weight(self):
init_layer(self.conv1)
init_layer(self.conv2)
init_bn(self.bn1)
init_bn(self.bn2)
def forward(self, input, pool_size=(2, 2), pool_type='avg'):
x = input
x = F.relu_(self.bn1(self.conv1(x)))
x = F.relu_(self.bn2(self.conv2(x)))
if pool_type == 'max':
x = F.max_pool2d(x, kernel_size=pool_size)
elif pool_type == 'avg':
x = F.avg_pool2d(x, kernel_size=pool_size)
elif pool_type == 'avg+max':
x1 = F.avg_pool2d(x, kernel_size=pool_size)
x2 = F.max_pool2d(x, kernel_size=pool_size)
x = x1 + x2
else:
raise Exception('Incorrect argument!')
return x
class Cnn14_DecisionLevelMax(nn.Module):
def __init__(self, sample_rate, window_size, hop_size, mel_bins, fmin,
fmax, classes_num):
super(Cnn14_DecisionLevelMax, self).__init__()
window = 'hann'
center = True
pad_mode = 'reflect'
ref = 1.0
amin = 1e-10
top_db = None
self.interpolate_ratio = 32 # Downsampled ratio
# Spectrogram extractor
self.spectrogram_extractor = Spectrogram(n_fft=window_size, hop_length=hop_size,
win_length=window_size, window=window, center=center, pad_mode=pad_mode,
freeze_parameters=True)
# Logmel feature extractor
self.logmel_extractor = LogmelFilterBank(sr=sample_rate, n_fft=window_size,
n_mels=mel_bins, fmin=fmin, fmax=fmax, ref=ref, amin=amin, top_db=top_db,
freeze_parameters=True)
# Spec augmenter
self.spec_augmenter = SpecAugmentation(time_drop_width=64, time_stripes_num=2,
freq_drop_width=8, freq_stripes_num=2)
self.bn0 = nn.BatchNorm2d(64)
self.conv_block1 = ConvBlock(in_channels=1, out_channels=64)
self.conv_block2 = ConvBlock(in_channels=64, out_channels=128)
self.conv_block3 = ConvBlock(in_channels=128, out_channels=256)
self.conv_block4 = ConvBlock(in_channels=256, out_channels=512)
self.conv_block5 = ConvBlock(in_channels=512, out_channels=1024)
self.conv_block6 = ConvBlock(in_channels=1024, out_channels=2048)
self.fc1 = nn.Linear(2048, 2048, bias=True)
self.fc_audioset = nn.Linear(2048, classes_num, bias=True)
self.init_weight()
def init_weight(self):
init_bn(self.bn0)
init_layer(self.fc1)
init_layer(self.fc_audioset)
def forward(self, input, mixup_lambda=None):
"""
Input: (batch_size, data_length)"""
x = self.spectrogram_extractor(input) # (batch_size, 1, time_steps, freq_bins)
x = self.logmel_extractor(x) # (batch_size, 1, time_steps, mel_bins)
frames_num = x.shape[2]
x = x.transpose(1, 3)
x = self.bn0(x)
x = x.transpose(1, 3)
if self.training:
x = self.spec_augmenter(x)
# Mixup on spectrogram
if self.training and mixup_lambda is not None:
x = do_mixup(x, mixup_lambda)
x = self.conv_block1(x, pool_size=(2, 2), pool_type='avg')
x = F.dropout(x, p=0.2, training=self.training)
x = self.conv_block2(x, pool_size=(2, 2), pool_type='avg')
x = F.dropout(x, p=0.2, training=self.training)
x = self.conv_block3(x, pool_size=(2, 2), pool_type='avg')
x = F.dropout(x, p=0.2, training=self.training)
x = self.conv_block4(x, pool_size=(2, 2), pool_type='avg')
x = F.dropout(x, p=0.2, training=self.training)
x = self.conv_block5(x, pool_size=(2, 2), pool_type='avg')
x = F.dropout(x, p=0.2, training=self.training)
x = self.conv_block6(x, pool_size=(1, 1), pool_type='avg')
x = F.dropout(x, p=0.2, training=self.training)
x = torch.mean(x, dim=3)
x1 = F.max_pool1d(x, kernel_size=3, stride=1, padding=1)
x2 = F.avg_pool1d(x, kernel_size=3, stride=1, padding=1)
x = x1 + x2
x = F.dropout(x, p=0.5, training=self.training)
x = x.transpose(1, 2)
x = F.relu_(self.fc1(x))
x = F.dropout(x, p=0.5, training=self.training)
segmentwise_output = torch.sigmoid(self.fc_audioset(x))
(clipwise_output, _) = torch.max(segmentwise_output, dim=1)
# Get framewise output
framewise_output = interpolate(segmentwise_output, self.interpolate_ratio)
framewise_output = pad_framewise_output(framewise_output, frames_num)
output_dict = {'framewise_output': framewise_output,
'clipwise_output': clipwise_output}
return output_dict |