https://aistudio.baidu.com/datasetdetail/10278
from torchvision import transforms
import torchvision
import torch
import matplotlib.pyplot as plt
from PIL import Image
#一、数据转换
train_transformer=transforms.Compose(
[
transforms.RandomHorizontalFlip(0.2),
transforms.RandomRotation(68),
transforms.RandomGrayscale(0.2),
transforms.Resize((256,256)),
transforms.ToTensor(),
transforms.Normalize(mean=[0.5,0.5,0.5],
std=[0.5,0.5,0.5])
]
)
test_transformer=transforms.Compose(
[
transforms.Resize((256,256)),
transforms.ToTensor(),
transforms.Normalize(mean=[0.5,0.5,0.5],
std=[0.5,0.5,0.5])
]
)
#二、读入数据
train_dataset=torchvision.datasets.ImageFolder(
'E:/Jupytercode/血细胞分类/数据/blood-cells/dataset2-master/dataset2-master/images/TRAIN',
transform=train_transformer
)
test_dataset=torchvision.datasets.ImageFolder(
'E:/Jupytercode/血细胞分类/数据/blood-cells/dataset2-master/dataset2-master/images/TEST',
transform=test_transformer
)
#进行编码
#原 {'EOSINOPHIL': 0, 'LYMPHOCYTE': 1, 'MONOCYTE': 2, 'NEUTROPHIL': 3}
#转换后 {0: 'EOSINOPHIL', 1: 'LYMPHOCYTE', 2: 'MONOCYTE', 3: 'NEUTROPHIL'}
id_to_class={}
for k,v in train_dataset.class_to_idx.items():
#print(k,v)
id_to_class[v]=k
#id_to_class #查看转换后的格式
#三、批次读入数据,可以作为神经网络的输入 一次性拿多少张图片进行训练
Batch_size=64#一次性训练64张
dl_train=torch.utils.data.DataLoader(
train_dataset,
batch_size=Batch_size,
shuffle=True
)
dl_test=torch.utils.data.DataLoader(
test_dataset,
batch_size=Batch_size,
shuffle=True
)
#取一个批次的数据
# img,label=next(iter(dl_train))
# plt.figure(figsize=(12,8))
# for i,(img,label) in enumerate(zip(img[:8],label[:8])):
# img=(img.permute(1,2,0).numpy()+1)/2
# plt.subplot(2,4,i+1)
# plt.title(id_to_class.get(label.item())) #0: 'EOSINOPHIL', 1: 'LYMPHOCYTE', 2: 'MONOCYTE', 3: 'NEUTROPHIL'
# plt.imshow(img)
# plt.show() #查看图片
print("数据处理已完成")
import torch.nn as nn
import torch
#建立神经网络
class Net(nn.Module): # 模仿VGG
def __init__(self):
super(Net, self).__init__()
self.layer1 = nn.Sequential(
nn.Conv2d(3, 32, kernel_size=3),
nn.ReLU(),
nn.MaxPool2d(2, 2)
)
self.layer2 = nn.Sequential(
nn.Conv2d(32, 64, kernel_size=3),
nn.ReLU(),
nn.MaxPool2d(2, 2)
)
self.layer3 = nn.Sequential(
nn.Conv2d(64, 128, kernel_size=3),
nn.ReLU(),
nn.MaxPool2d(2, 2)
)
self.layer4 = nn.Sequential(
nn.Conv2d(128, 256, kernel_size=3),
nn.ReLU(),
nn.MaxPool2d(2, 2)
)
self.fc = nn.Sequential(
nn.Linear(256 * 14 * 14, 1024),
nn.ReLU(),
nn.Linear(1024, 4)
)
def forward(self, x):
x = self.layer1(x)
x = self.layer2(x)
x = self.layer3(x)
x = self.layer4(x)
#print(x.shape)
# 将原来的张量 x (四维)重新塑造为一个二维张量。第一个维度的大小由 PyTorch 自动计算,而第二个维度的大小被设置为 256 * 14 * 14
x = x.view(-1, 256 * 14 * 14)
x = self.fc(x)
return x
if __name__ == '__main__':
x = torch.rand([8, 3, 256, 256])
model = Net()
y = model(x)
import torch as t
import torch.nn as nn
from tqdm import tqdm #进度条
import net
from dataset import *
device = t.device("cuda") if t.cuda.is_available() else t.device("cpu")
train_dataset=torchvision.datasets.ImageFolder(
'E:/Jupytercode/血细胞分类/数据/blood-cells/dataset2-master/dataset2-master/images/TRAIN',
transform=train_transformer
)
test_dataset=torchvision.datasets.ImageFolder(
'E:/Jupytercode/血细胞分类/数据/blood-cells/dataset2-master/dataset2-master/images/TEST',
transform=test_transformer
)
id_to_class={}
for k,v in train_dataset.class_to_idx.items():
#print(k,v)
id_to_class[v]=k
Batch_size=64#一次性训练64张
dl_train=torch.utils.data.DataLoader(
train_dataset,
batch_size=Batch_size,
shuffle=True
)
dl_test=torch.utils.data.DataLoader(
test_dataset,
batch_size=Batch_size,
shuffle=True
)
model=net.Net()
model = model.to(device)
optim=torch.optim.Adam(model.parameters(),lr=0.001)
loss_fn=nn.CrossEntropyLoss()
def fit(epoch, model, trainloader, testloader):
correct = 0
total = 0
running_loss = 0
model.train() # 训练模式下 识别normalize层
for x, y in tqdm(trainloader):
x, y = x.to('cuda'), y.to('cuda')
y_pred = model(x)
loss = loss_fn(y_pred, y)
optim.zero_grad()
loss.backward()
optim.step()
with torch.no_grad():
y_pred = torch.argmax(y_pred, dim=1)
correct += (y_pred == y).sum().item()
total += y.size(0)
running_loss += loss.item()
epoch_loss = running_loss / len(trainloader.dataset)
epoch_acc = correct / total
test_correct = 0
test_total = 0
test_running_loss = 0
model.eval() # 验证模式下 不识别normalize层
with torch.no_grad():
for x, y in tqdm(testloader):
x, y = x.to('cuda'), y.to('cuda')
y_pred = model(x)
loss = loss_fn(y_pred, y)
y_pred = torch.argmax(y_pred, dim=1)
test_correct += (y_pred == y).sum().item()
test_total += y.size(0)
test_running_loss += loss.item()
epoch_test_loss = test_running_loss / len(testloader.dataset)
epoch_test_acc = test_correct / test_total
if epoch_acc > 0.95:
model_state_dict = model.state_dict()
torch.save(model_state_dict, './{}{}.pth'.format(epoch_acc, epoch_test_acc))
print('epoch: ', epoch,
'loss: ', round(epoch_loss, 3),
'accuracy:', round(epoch_acc, 3),
'test_loss: ', round(epoch_test_loss, 3),
'test_accuracy:', round(epoch_test_acc, 3)
)
return epoch_loss, epoch_acc, epoch_test_loss, epoch_test_acc
if __name__ == '__main__':
epochs = 20
train_loss = []
train_acc = []
test_loss = []
test_acc = []
for epoch in range(epochs):
epoch_loss, epoch_acc, epoch_test_loss, epoch_test_acc = fit(epoch,
model,
dl_train,
dl_test)
train_loss.append(epoch_loss)
train_acc.append(epoch_acc)
test_loss.append(epoch_test_loss)
test_acc.append(epoch_test_acc)
plt.plot(range(1, epochs + 1), train_loss, label='train_loss')# 绘制训练损失曲线,使用range(1, epochs+1)生成横坐标轴上的点,train_loss为纵坐标轴上的点
plt.plot(range(1, epochs + 1), test_loss, label='test_loss')# 绘制验证损失曲线,使用range(1, epochs+1)生成横坐标轴上的点,val_loss为纵坐标轴上的点
plt.legend()# 添加图例,label参数在前面的plot中设置,用于区分不同曲线
plt.xlabel('Epochs') # 设置横坐标轴的标签为'Epochs'
plt.ylabel('Loss') # 设置纵坐标轴的标签为'Loss'
plt.savefig('loss.png')
plt.show()
plt.plot(range(1, epochs + 1), train_acc, label='train_acc')
plt.plot(range(1, epochs + 1), test_acc, label='test_acc')
plt.title('Training and Validation Accuracy') # 可以添加标题
plt.xlabel('Epochs') # 为x轴添加标签
plt.ylabel('Accuracy')
plt.legend()
plt.savefig('acc.png')
plt.show()
torch.save(model,'Bloodcell.pkl') #保存模型训练权重
在深度学习中,模型通常具有两种运行模式:训练模式和验证/测试模式。这两种模式的主要区别在于模型的行为和参数更新方式。
model.train()
model.eval()
切换模型的运行模式是为了确保在不同阶段使用正确的行为。在训练模式下,模型需要进行梯度计算和参数更新,而在验证/测试模式下,模型不需要进行参数更新,而是专注于性能评估。
预测pred.py
from dataset import *
model=torch.load('Bloodcell.pkl')
img,label=next(iter(dl_test)) #选取一些图片进行预测
img=img.to('cuda')
model.eval()
pred=model(img)
pred_re=torch.argmax(pred, dim=1)
pred_re=pred_re.cpu().numpy()
pred_re=pred_re.tolist()
for i in pred_re[0:8]:
print(id_to_class[i])
id_to_class[pred_re[0:8][1]]
plt.figure(figsize=(16,8))
img=img.cpu()#把图片重新放到CPU上
for i,(img,label) in enumerate(zip(img[:8],label[:8])):
img=(img.permute(1,2,0).numpy()+1)/2
plt.subplot(2,4,i+1)
pred_title=id_to_class[pred_re[0:8][i]]
plt.title('R:{},P:{}'.format(id_to_class.get(label.item()),pred_title))
plt.imshow(img)
plt.show()