文章目录
- 前言
- 一、数据预处理
- 1.分类数据存放
- 2.生成train.txt与val.txt
- 二、更改配置文件
- 1.自定义修改
- 三、定义resnet网络
- 四、train.py训练
- 五、预测predict.py实现
- 六、预测结果
- 七、完整项目代码+数据集(大于1500张)
- 总结
前言
本打算昨天写这篇博客的，推迟到今天晚上。实际上，上午我已经把模型训练完了，迭代100次，最后准确率可达到95%，考虑到用的台式机没有装显卡，所以使用的数据集一共只有340张。分布情况如下。
【训练集】女性：150张； 男性：150张
【验证集】女性：20张； 男性：20张
数据集预览
女性数据
男性数据
提示：以下是本篇文章正文内容，下面案例可供参考
一、数据预处理
1.分类数据存放
分类数据是不需要像目标检测数据样，每张图片去打标签，我们唯一需要做的就是把同类照片放到一个文件夹。如我们新建一个名字为“0”的文件夹，用于存放所有用于训练的150张女性图片，新建一个名字为“1”的文件夹，用于存放所有用于训练的150张男性图片。同理，验证集也如此排布。如下图所示，为我的数据排布情况，数据集存放在gender_data文件夹里。
2.生成train.txt与val.txt
图片数据排布完后，还需要做的就是使用脚本工具，分别生成训练集和验证集的存储路径及对应标签（0或者1）。这一步至关重要，必不可少。因为训练时，就是通过读取这两个txt文件里的路径，来读取训练集和验证集的图片，并输送给网络，同时给对应的标签类别。
脚本命名Build_all_classes_path_to_txt.py
**注意：**需要分两次执行，分别创建train.txt与val.txt，记得更改路径
import os
import os.path
def listfiles(rootDir, txtfile, foldnam =''):
ftxtfile = open(txtfile, 'a')
list_dirs = os.walk(rootDir)
#foldnam = FolderName[0]
#print(foldnam)
count = 0
dircount = 0
for root,dirs,files in list_dirs:
for d in dirs:
#print(os.path.join(root, d))
dircount += 1
for f in files:
#print(os.path.join(root, f))
ftxtfile.write(os.path.join(root, f) + ' ' + foldnam + '\n')
count += 1
#print(rootDir + ' has ' + str(count) + ' files')
#获取路径下所有文件夹的完整路径，用于读取文件用
def GetFileFromThisRootDir(dir):
allfolder = []
folder_name = ''
for root,dirs,files in os.walk(dir):
allfolder.append(root)
"""
for filespath in files:
filepath = os.path.join(root, filespath)
#print(filepath)
extension = os.path.splitext(filepath)[1][1:]
if needExtFilter and extension in ext:
allfiles.append(filepath)
elif not needExtFilter:
allfiles.append(filepath)
"""
All_folder = allfolder
#print(All_folder)
for folder_num in All_folder[1:]:
#print(folder_num)
folder_name = folder_num.split('/')[:]
print (folder_name)
listfiles(folder_num, txtfile_path, folder_name[-1])
return
#def Generate_path_to_txt(FolderPath=[]):
# print(FolderPath)
if __name__=='__main__':
folder_path = 'F:/Study_code/classification-pytorch/Classification-MaleFemale-pytorch/gender_data/val/' #val and train folder
txtfile_path = 'F:/Study_code/classification-pytorch/Classification-MaleFemale-pytorch/gender_data/val.txt'
folder_path = GetFileFromThisRootDir(folder_path)
生成的.txt文件内容如下
二、更改配置文件
1.自定义修改
实际上很多可以修改，如loss选择、梯度下降方法、学习率、衰减率等等。
代码如下（示例）：
class Config(object):
num_classes = 2
loss = 'softmax' #focal_loss
test_root = 'gender_data/'
test_list = 'gender_data/val.txt'
train_batch_size = 16 # batch size
train_root = 'gender_data/'
train_list = 'gender_data/train.txt'
finetune = False
load_model_path = 'checkpoints/model-epoch-1.pth'
save_interval = 1
input_shape = (3, 112, 112)
optimizer = 'sgd' # optimizer should be sgd, adam
num_workers = 4 # how many workers for loading data
print_freq = 10 # print info every N batch
milestones = [60, 100] # adjust lr
lr = 0.1 # initial learning rate
max_epoch = 100 # max epoch
lr_decay = 0.95 # when val_loss increase, lr = lr*lr_decay
weight_decay = 5e-4
三、定义resnet网络
实际上resnet网络pytorch内部经典网络中已存在，但作者还是参考开源代码自己构建了一个resnet网络的py文件resnet.py。这个可直接拿来使用。本次训练使用的是resnet18.
代码如下（示例）：
"""resnet in pytorch
[1] Kaiming He, Xiangyu Zhang, Shaoqing Ren, Jian Sun.
Deep Residual Learning for Image Recognition
https://arxiv.org/abs/1512.03385v1
"""
import torch
import torch.nn as nn
class Flatten(nn.Module):
def forward(self, input):
#print(input.view(input.size(0), -1).shape)
return input.view(input.size(0), -1)
class BasicBlock(nn.Module):
"""Basic Block for resnet 18 and resnet 34
"""
expansion = 1
def __init__(self, in_channels, out_channels, stride=1):
super().__init__()
#residual function
self.residual_function = nn.Sequential(
nn.Conv2d(in_channels, out_channels, kernel_size=3, stride=stride, padding=1, bias=False),
nn.BatchNorm2d(out_channels),
nn.ReLU(inplace=True),
nn.Conv2d(out_channels, out_channels * BasicBlock.expansion, kernel_size=3, padding=1, bias=False),
nn.BatchNorm2d(out_channels * BasicBlock.expansion)
)
#shortcut
self.shortcut = nn.Sequential()
#the shortcut output dimension is not the same with residual function
#use 1*1 convolution to match the dimension
if stride != 1 or in_channels != BasicBlock.expansion * out_channels:
self.shortcut = nn.Sequential(
nn.Conv2d(in_channels, out_channels * BasicBlock.expansion, kernel_size=1, stride=stride, bias=False),
nn.BatchNorm2d(out_channels * BasicBlock.expansion)
)
def forward(self, x):
return nn.ReLU(inplace=True)(self.residual_function(x) + self.shortcut(x))
class BottleNeck(nn.Module):
"""Residual block for resnet over 50 layers
"""
expansion = 1
def __init__(self, in_channels, out_channels, stride=1):
super().__init__()
self.residual_function = nn.Sequential(
nn.Conv2d(in_channels, out_channels, kernel_size=1, bias=False),
nn.BatchNorm2d(out_channels),
nn.ReLU(inplace=True),
nn.Conv2d(out_channels, out_channels, stride=stride, kernel_size=3, padding=1, bias=False),
nn.BatchNorm2d(out_channels),
nn.ReLU(inplace=True),
nn.Conv2d(out_channels, out_channels * BottleNeck.expansion, kernel_size=1, bias=False),
nn.BatchNorm2d(out_channels * BottleNeck.expansion),
)
self.shortcut = nn.Sequential()
if stride != 1 or in_channels != out_channels * BottleNeck.expansion:
self.shortcut = nn.Sequential(
nn.Conv2d(in_channels, out_channels * BottleNeck.expansion, stride=stride, kernel_size=1, bias=False),
nn.BatchNorm2d(out_channels * BottleNeck.expansion)
)
def forward(self, x):
return nn.ReLU(inplace=True)(self.residual_function(x) + self.shortcut(x))
class ResNet(nn.Module):
def __init__(self, block, num_block, scale=0.25, num_classes=2):
super().__init__()
self.in_channels = int(64 * scale)
self.conv1 = nn.Sequential(
nn.Conv2d(3, int(64 * scale), kernel_size=3, padding=1, bias=False),
nn.BatchNorm2d(int(64 * scale)),
nn.ReLU(inplace=True))
#we use a different inputsize than the original paper
#so conv2_x's stride is 1
self.conv2_x = self._make_layer(block, int( 64 * scale), num_block[0], 2)
self.conv3_x = self._make_layer(block, int(128 * scale), num_block[1], 2)
self.conv4_x = self._make_layer(block, int(256 * scale), num_block[2], 2)
self.conv5_x = self._make_layer(block, int(512 * scale), num_block[3], 2)
self.output = nn.Sequential(
nn.Conv2d(int(512*scale), int(512*scale), kernel_size=(7, 7), stride=1, groups=int(512*scale), bias=False),
nn.BatchNorm2d(int(512*scale)),
Flatten(),
#nn.Linear(int(32768 * scale), num_classes)
nn.Linear(int(512 * scale), num_classes)
)
def _make_layer(self, block, out_channels, num_blocks, stride):
"""make resnet layers(by layer i didnt mean this 'layer' was the
same as a neuron netowork layer, ex. conv layer), one layer may
contain more than one residual block
Args:
block: block type, basic block or bottle neck block
out_channels: output depth channel number of this layer
num_blocks: how many blocks per layer
stride: the stride of the first block of this layer
Return:
return a resnet layer
"""
# we have num_block blocks per layer, the first block
# could be 1 or 2, other blocks would always be 1
strides = [stride] + [1] * (num_blocks - 1)
layers = []
for stride in strides:
layers.append(block(self.in_channels, out_channels, stride))
self.in_channels = out_channels * block.expansion
return nn.Sequential(*layers)
def forward(self, x):
output = self.conv1(x)
output = self.conv2_x(output)
output = self.conv3_x(output)
output = self.conv4_x(output)
output = self.conv5_x(output)
output = self.output(output)
return output
def resnet18():
""" return a ResNet 18 object
"""
return ResNet(BasicBlock, [2, 2, 2, 2])
def resnet34():
""" return a ResNet 34 object
"""
return ResNet(BasicBlock, [3, 4, 6, 3])
def resnet50():
""" return a ResNet 50 object
"""
return ResNet(BottleNeck, [3, 4, 6, 3])
def resnet101():
""" return a ResNet 101 object
"""
return ResNet(BottleNeck, [3, 4, 23, 3])
def resnet152():
""" return a ResNet 152 object
"""
return ResNet(BottleNeck, [3, 8, 36, 3])
from thop import profile
from thop import clever_format
if __name__=='__main__':
input = torch.Tensor(1, 3, 112, 112)
model = resnet18()
#print(model)
flops, params = profile(model, inputs=(input, ))
flops, params = clever_format([flops, params], "%.3f")
#print(model)
print('VoVNet Flops:', flops, ',Params:' ,params)
四、train.py训练
训练代码及书写逻辑也是个常规操作，很好理解，关键点在于如何去加载数据，并做预处理变换。
代码如下（示例），仅供参考：
import torch
from torch.utils import data
import os
import time
import numpy as np
from models.resnet import * #resnet34
from models.mobilenetv2 import mobilenetv2
#from models.mobilenetv3 import *
#from models.repvgg import *
from data.dataset import Dataset
from config.config import Config
from loss.focal_loss import FocalLoss
from utils.cosine_lr_scheduler import CosineDecayLR
#from torch.autograd import Variable
def train(model, criterion, optimizer, scheduler, trainloader, epoch):
model.train()
for ii, data in enumerate(trainloader):
start = time.time()
iters = epoch * len(trainloader) + ii
scheduler.step(iters + 1)
data_input, label = data
#print(data_input, label)
#data_input, label = Variable(data_input), Variable(label)-1
data_input = data_input.to(device)
label = label.to(device).long()
output = model(data_input)
#print(output)
#print(label)
loss = criterion(output, label)
optimizer.zero_grad()
loss.backward()
optimizer.step()
if iters % opt.print_freq == 0:
output = output.data.cpu().numpy()
output = np.argmax(output, axis=1)
label = label.data.cpu().numpy()
acc = np.mean((output == label).astype(int))
speed = opt.print_freq / (time.time() - start)
time_str = time.asctime(time.localtime(time.time()))
print(time_str, 'epoch', epoch, 'iters', iters, 'speed', speed, 'lr',optimizer.param_groups[0]['lr'], 'loss', loss.cpu().detach().numpy(), 'acc', acc)
def eval_train(model, criterion, testloader):
model.eval()
test_loss = 0.0 # cost function error
correct = 0.0
with torch.no_grad():
for (datas, labels) in testloader:
datas = datas.to(device)
labels = labels.to(device).long()
outputs = model(datas)
loss = criterion(outputs, labels)
test_loss += loss.item()
_, preds = outputs.max(1)
correct += preds.eq(labels).sum()
print('Test set: Average loss: {:.4f}, Accuracy: {:.4f}'.format(
test_loss / len(testloader),
correct.float() / len(testloader)
))
if __name__ == '__main__':
opt = Config()
#os.environ['CUDA_VISIBLE_DEVICES'] = '0'
#device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
device = torch.device("cpu")
test_dataset = Dataset(opt.test_root, opt.test_list, phase='test', input_shape=opt.input_shape)
testloader = data.DataLoader(test_dataset,
shuffle=False,
pin_memory=True,
num_workers=opt.num_workers)
train_dataset = Dataset(opt.train_root, opt.train_list, phase='train', input_shape=opt.input_shape)
trainloader = data.DataLoader(train_dataset,
batch_size=opt.train_batch_size,
shuffle=True,
pin_memory=True,
num_workers=opt.num_workers)
if opt.loss == 'focal_loss':
criterion = FocalLoss(gamma=2)
else:
criterion = torch.nn.CrossEntropyLoss()
model = resnet18()
#model = get_RepVGG_func_by_name('RepVGG-B0')
#model = mobilenetv2()
if opt.finetune == True:
model.load_state_dict(torch.load(opt.load_model_path))
model = torch.nn.DataParallel(model)
model.to(device)
total_batch = len(trainloader)
NUM_BATCH_WARM_UP = total_batch * 5
optimizer = torch.optim.SGD(model.parameters(), lr=opt.lr, weight_decay=opt.weight_decay)
scheduler = CosineDecayLR(optimizer, opt.max_epoch * total_batch, opt.lr, 1e-6, NUM_BATCH_WARM_UP)
print('{} train iters per epoch in dataset'.format(len(trainloader)))
for epoch in range(0, opt.max_epoch):
train(model, criterion, optimizer, scheduler, trainloader, epoch)
if epoch % opt.save_interval == 0 or epoch == (opt.max_epoch - 1):
torch.save(model.module.state_dict(), 'checkpoints/model-epoch-'+str(epoch) + '.pth')
eval_train(model, criterion, testloader)
训练过程日志打印如下，最后的预测准确率还不错：
五、预测predict.py实现
代码如下（示例），仅供参考：
from torch.autograd import Variable
from torchvision import datasets, models, transforms
import matplotlib.pyplot as plt # plt 用于显示图片
from PIL import Image, ImageDraw, ImageFont
import cv2
import numpy as np
from models.resnet import *
from config.config import Config
from models.mobilenetv2 import *
def show_infer_result(result):
font = ImageFont.truetype('data/font/HuaWenXinWei-1.ttf', 50)
plt.rcParams['font.sans-serif'] = ['SimHei'] # 中文乱码
plt.subplot(121)
plt.imshow(image)
plt.title('测试图片')
#不显示坐标轴
plt.axis('off')
#子图2
plt.subplot(122)
img2_2 = cv2.imread('./test2.jpg')
cv2img = cv2.cvtColor(img2_2, cv2.COLOR_BGR2RGB)
img_PIL = Image.fromarray(cv2img)
draw = ImageDraw.Draw(img_PIL)
label = ''
if result == 0:
label = '女性'
else:
label = '男性'
draw.text((170, 150), label, fill=(255, 0, 255), font=font, align='center')
cheng = cv2.cvtColor(np.array(img_PIL), cv2.COLOR_RGB2BGR)
plt.imshow(cheng)
plt.title('预测结果')
plt.axis('off')
# #设置子图默认的间距
plt.tight_layout()
#显示图像
plt.show()
def model_infer(img, model_path):
data_transforms = transforms.Compose([
transforms.Resize([112, 112]),
transforms.ToTensor(),
transforms.Normalize([0.5, 0.5, 0.5], [0.5, 0.5, 0.5])])
# net = resnet18().cuda().eval() # 实例化自己的模型；
net = resnet18().eval() # resnet模型
net.load_state_dict((torch.load(model_path)), False)
imgblob = data_transforms(img).unsqueeze(0).type(torch.FloatTensor).cpu()
#print(imgblob)
imgblob = Variable(imgblob)
torch.no_grad()
output = net(imgblob)
_, pred = output.max(1)
# print("output ---> ",output)
predict_result = pred.numpy()
show_infer_result(predict_result)
return predict_result
if __name__ == "__main__":
imagepath = './gender_data/val/1/14901.png'
image = Image.open(imagepath)
model_path = "./checkpoints/model-epoch-99.pth"
model_infer(image, model_path)
print("====infer over!")
六、预测结果
女性图片测试
男性图片测试
七、完整项目代码+数据集(大于1500张)
准备做与其他几个网络的对比实验，如mobilenetv2 、mobilenetv3、repvgg，做完后，再一并贴上。
觉得有用的，感谢先点赞+收藏+关注吧，
如何快速搭建神经网络并训练，请参考另外博客：五步教你使用Pytorch搭建神经网络并训练
总结
本文属于使用resnet网络+pytorch深度学习框架，实现男女性别识别分类模型的训练+预测，当然还包括了分类数据集制作，公开了项目部分代码仅供参考学习，后续会补上多组对比实验和代码模型。敬请关注！
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