为基于cnn实现书法字体风格识别的python代码设计编写pyqt的gui界面，该程序包含以下几个模块（class MainWindow(QMainWindow)，def load_model(self)，def open_image(self)，def preprocess_images(self, image_paths)，def predict_images(self)，def display_images(self, image_paths)，def classify_image(self)）要求按一次“选择图片”按钮可以直接输入五张图片，并且按一次识别图片按钮之后一次性输出五个结果：class LeNet5(nn.Module): def init(self, num_class=10): super(LeNet5, self).init() self.conv1 = nn.Conv2d(3, 8, 5) self.pool1 = nn.AvgPool2d((2, 2)) self.conv2 = nn.Conv2d(8, 16, 5) self.pool2 = nn.AvgPool2d((2, 2)) self.conv3 = nn.Conv2d(16, 32, 5) self.relu = nn.ReLU() self.fc1 = nn.Linear(28800, 1024) self.fc2 = nn.Linear(1024, num_class) # 实现LeNet5模型的前向传播过程。输入通过卷积层、激活函数和池化层进行特征提取，然后通过全连接层进行分类。 def forward(self, x): # x: torch.Size([32, 3, 150, 150]) x = self.conv1(x) # torch.Size([32, 8, 146, 146]) x = self.relu(x) x = self.pool1(x) # torch.Size([32, 8, 73, 73]) x = self.conv2(x) # torch.Size([32, 16, 69, 69]) x = self.relu(x) x = self.pool2(x) # torch.Size([32, 16, 34, 34]) x = self.conv3(x) # torch.Size([32, 32, 30, 30]) x = self.relu(x) x = x.flatten(start_dim=1) # torch.Size([32, 28800]) x = self.fc1(x) # torch.Size([32, 2024]) x = self.relu(x) x = self.fc2(x) # torch.Size([32, 4]) return x

很高兴为您解答这个问题！以下是一个基于PyQt的GUI界面的代码示例，其中包含了您提供的函数和LeNet5模型的代码实现：

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QLabel, QPushButton, QFileDialog
from PyQt5.QtGui import QPixmap
import torch
import torch.nn as nn
from torchvision import transforms


class LeNet5(nn.Module):
    def __init__(self, num_class=10):
        super(LeNet5, self).__init__()
        self.conv1 = nn.Conv2d(3, 8, 5)
        self.pool1 = nn.AvgPool2d((2, 2))
        self.conv2 = nn.Conv2d(8, 16, 5)
        self.pool2 = nn.AvgPool2d((2, 2))
        self.conv3 = nn.Conv2d(16, 32, 5)
        self.relu = nn.ReLU()
        self.fc1 = nn.Linear(28800, 1024)
        self.fc2 = nn.Linear(1024, num_class)
        
    def forward(self, x):
        x = self.conv1(x)
        x = self.relu(x)
        x = self.pool1(x)
        x = self.conv2(x)
        x = self.relu(x)
        x = self.pool2(x)
        x = self.conv3(x)
        x = self.relu(x)
        x = x.flatten(start_dim=1)
        x = self.fc1(x)
        x = self.relu(x)
        x = self.fc2(x)
        return x


class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.title = '书法字体风格识别'
        self.left = 100
        self.top = 100
        self.width = 600
        self.height = 400
        self.initUI()
        self.model = None
        self.transform = transforms.Compose([
            transforms.Resize((150, 150)),  # 将所有图像缩放到150x150
            transforms.ToTensor(),  # 将图像转换为张量
            transforms.Normalize((0.5, 0.5, 0.5), (0.5, 0.5, 0.5))  # 标准化图像张量
        ])
        self.image_paths = []

    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)

        # 创建标签和按钮
        self.label = QLabel(self)
        self.label.move(50, 50)
        self.label.resize(150, 150)

        self.button_load_model = QPushButton('加载模型', self)
        self.button_load_model.move(50, 250)
        self.button_load_model.clicked.connect(self.load_model)

        self.button_open_image = QPushButton('选择图片', self)
        self.button_open_image.move(200, 250)
        self.button_open_image.clicked.connect(self.open_image)

        self.button_predict_images = QPushButton('识别图片', self)
        self.button_predict_images.move(350, 250)
        self.button_predict_images.clicked.connect(self.predict_images)

    def load_model(self):
        # 加载预训练的模型
        self.model = LeNet5()
        self.model.load_state_dict(torch.load('lenet5.pth', map_location=torch.device('cpu')))
        self.model.eval()

    def open_image(self):
        # 打开文件对话框选择图像文件
        options = QFileDialog.Options()
        options |= QFileDialog.DontUseNativeDialog
        files, _ = QFileDialog.getOpenFileNames(self, "选择图像文件", "", "Image Files (*.jpg *.jpeg *.png *.bmp)", options=options)
        self.image_paths = files[:5]  # 最多选择5张图片
        self.display_images(self.image_paths)

    def preprocess_images(self, image_paths):
        # 预处理图像：将所有图像缩放、转换为张量并标准化
        images = []
        for path in image_paths:
            image = Image.open(path)
            image = self.transform(image)
            images.append(image)
        images = torch.stack(images)
        return images

    def predict_images(self):
        if not self.model:
            return
        if not self.image_paths:
            return
        images = self.preprocess_images(self.image_paths)
        outputs = self.model(images)
        _, predicted = torch.max(outputs, 1)
        results = predicted.tolist()
        self.display_results(results)

    def display_images(self, image_paths):
        # 在标签上显示图像
        pixmap = QPixmap(image_paths[0])
        pixmap = pixmap.scaled(150, 150)
        self.label.setPixmap(pixmap)
        for i in range(1, len(image_paths)):
            label = QLabel(self)
            label.move(50 + i * 150, 50)
            label.resize(150, 150)
            pixmap = QPixmap(image_paths[i])
            pixmap = pixmap.scaled(150, 150)
            label.setPixmap(pixmap)

    def display_results(self, results):
        # 在标签上显示结果
        for i in range(len(results)):
            label = QLabel(self)
            label.move(50 + i * 150, 230)
            label.resize(150, 20)
            text = '预测结果：{}'.format(results[i])
            label.setText(text)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())

上述代码中，`MainWindow`是主窗口类，包括了`load_model()`、`open_image()`、`preprocess_images()`、`predict_images()`和`display_images()`等方法，用于加载预训练模型、打开图像文件、预处理图像、预测图像并在GUI界面上显示图像和结果。`LeNet5`是一个PyTorch模型类，用于实现LeNet5模型的前向传播过程。在`MainWindow`类中，我们使用了PyQt的各种组件和布局方式，实现了一个简单的GUI界面，包括了标签、按钮等。

在`open_image()`方法中，我们使用了`QFileDialog`类打开文件对话框，让用户选择图像文件。在`preprocess_images()`方法中，我们使用了`PIL`库对图像进行预处理，包括将图像缩放到150x150、转换为张量并标准化。在`predict_images()`方法中，我们使用预训练的LeNet5模型对图像进行预测，并在GUI界面上显示预测结果。

总体来说，这个代码示例实现了一个基于PyQt的GUI界面，可以识别书法字体风格。您可以根据自己的需求进行修改和优化。