关于python:深度学习性别识别

import torch
import math
import torch.nn as nn
from torch.autograd import Variable
from torchvision import transforms, models
import argparse
import os
from torch.utils.data import DataLoader
from torch.utils.data import Dataset
import random
class sexnet(nn.Module):

def __init__(self):
    super(sexnet, self).__init__()
    self.dense = nn.Sequential(nn.Linear(2, 2),
    )
def forward(self, x):
    out = self.dense(x)
    return out

class SexDataset(Dataset):

def __init__(self, txt, transform=None, target_transform=None):
    fh = open(txt, 'r')
    data = []
    for line in fh:
        line = line.strip('\n')
        line = line.rstrip()
        words = line.split()
        data.append((float(words[0]) / 2.0, float(words[1]) / 80.0, int(words[2])))
    random.shuffle(data)
    self.data = data
def __getitem__(self, index):
    return torch.FloatTensor([self.data[index][0], self.data[index][1]]), self.data[index][2]
def __len__(self):
    return len(self.data)

def train():

os.makedirs('./output', exist_ok=True)
batchsize = 10
train_data = SexDataset(txt='sex_train.txt')
val_data = SexDataset(txt='sex_val.txt')
train_loader = DataLoader(dataset=train_data, batch_size=batchsize, shuffle=True)
val_loader = DataLoader(dataset=val_data, batch_size=batchsize)
model = [港股开户](https://www.gendan5.com/HongKongstock.html)sexnet()
optimizer = torch.optim.Adam(model.parameters(), lr=0.01, weight_decay=1e-3)
scheduler = torch.optim.lr_scheduler.MultiStepLR(optimizer, [10, 20], 0.1)
loss_func = nn.CrossEntropyLoss()
epochs = 100
for epoch in range(epochs):
    # training-----------------------------------
    model.train()
    train_loss = 0
    train_acc = 0
    for batch, (batch_x, batch_y) in enumerate(train_loader):
        batch_x, batch_y = Variable(batch_x), Variable(batch_y)
        out = model(batch_x)
        loss = loss_func(out, batch_y)
        train_loss += loss.item()
        pred = torch.max(out, 1)[1]
        train_correct = (pred == batch_y).sum()
        train_acc += train_correct.item()
        print('epoch: %2d/%d batch %3d/%d  Train Loss: %.3f, Acc: %.3f'
              % (epoch + 1, epochs, batch, math.ceil(len(train_data) / batchsize),
                 loss.item(), train_correct.item() / len(batch_x)))
        optimizer.zero_grad()
        loss.backward()
        optimizer.step()
    scheduler.step()  # 更新 learning rate
    print('Train Loss: %.6f, Acc: %.3f' % (train_loss / (math.ceil(len(train_data) / batchsize)),
                                           train_acc / (len(train_data))))
    # evaluation--------------------------------
    model.eval()
    eval_loss = 0
    eval_acc = 0
    for batch_x, batch_y in val_loader:
        batch_x, batch_y = Variable(batch_x), Variable(batch_y)
        out = model(batch_x)
        loss = loss_func(out, batch_y)
        eval_loss += loss.item()
        pred = torch.max(out, 1)[1]
        num_correct = (pred == batch_y).sum()
        eval_acc += num_correct.item()
    print('Val Loss: %.6f, Acc: %.3f' % (eval_loss / (math.ceil(len(val_data) / batchsize)),
                                         eval_acc / (len(val_data))))
    # save model --------------------------------
    if (epoch + 1) % 1 == 0:
        torch.save(model.state_dict(), 'output/params_' + str(epoch + 1) + '.pth')

if name == ‘__main__’:

train()
print('finished')