t = [] t.append(transforms.ToTensor()) t.append(transforms.Normalize(IMAGENET_DEFAULT_MEAN, IMAGENET_DEFAULT_STD)) preprocess = transforms.Compose(t)

这段代码的作用是定义一个图像预处理的转换操作序列（transforms.Compose），该序列将输入图像转换为模型所需的张量格式，并进行归一化操作。具体来说，这个序列中包含了两个转换操作：

1. `transforms.ToTensor()`：将输入图像转换为张量格式。这个操作会将图像中的每个像素值除以255，将像素值的范围从0~255缩放到0~1之间，然后将结果存储在张量中。

2. `transforms.Normalize(IMAGENET_DEFAULT_MEAN, IMAGENET_DEFAULT_STD)`：将输入张量进行归一化操作。这个操作会减去均值(IMAGENET_DEFAULT_MEAN)并除以标准差(IMAGENET_DEFAULT_STD)，以将像素值的范围缩放到(-1,1)之间。

最后这个预处理的转换序列preprocess可以被用于对输入图像进行预处理，以便输入到模型中进行推断。

相关问题

修改以下代码使其能够输出模型预测结果： def open_image(self): file_dialog = QFileDialog() file_paths, _ = file_dialog.getOpenFileNames(self, "选择图片", "", "Image Files (*.png *.jpg *.jpeg)") if file_paths: self.display_images(file_paths) def preprocess_images(self, image_paths): data_transform = transforms.Compose([ transforms.CenterCrop(150), transforms.ToTensor(), transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225]) ]) self.current_image_paths = [] images = [] for image_path in image_paths: image = Image.open(image_path) image = data_transform(image) image = torch.unsqueeze(image, dim=0) images.append(image) self.current_image_paths.append(image_path) return images def predict_images(self): if not self.current_image_paths: return for i, image_path in enumerate(self.current_image_paths): image = self.preprocess_image(image_path) output = self.model(image) predicted_class = self.class_dict[output.argmax().item()] self.result_labels[i].setText(f"Predicted Class: {predicted_class}") self.progress_bar.setValue((i+1)*20) def display_images(self, image_paths): for i, image_path in enumerate(image_paths): image = QImage(image_path) image = image.scaled(300, 300, Qt.KeepAspectRatio) if i == 0: self.image_label_1.setPixmap(QPixmap.fromImage(image)) elif i == 1: self.image_label_2.setPixmap(QPixmap.fromImage(image)) elif i == 2: self.image_label_3.setPixmap(QPixmap.fromImage(image)) elif i == 3: self.image_label_4.setPixmap(QPixmap.fromImage(image)) elif i == 4: self.image_label_5.setPixmap(QPixmap.fromImage(image))

请注意，代码中的 preprocess_images 函数和 predict_images 函数中的 self.preprocess_image(image_path) 需要修改为 self.preprocess_images([image_path])。修改后的代码如下：

def open_image(self):
    file_dialog = QFileDialog()
    file_paths, _ = file_dialog.getOpenFileNames(self, "选择图片", "", "Image Files (*.png *.jpg *.jpeg)")
    if file_paths:
        self.display_images(file_paths)

def preprocess_images(self, image_paths):
    data_transform = transforms.Compose([
        transforms.CenterCrop(150),
        transforms.ToTensor(),
        transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225])
    ])
    self.current_image_paths = []
    images = []
    for image_path in image_paths:
        image = Image.open(image_path)
        image = data_transform(image)
        image = torch.unsqueeze(image, dim=0)
        images.append(image)
        self.current_image_paths.append(image_path)
    return images

def predict_images(self):
    if not self.current_image_paths:
        return
    for i, image_path in enumerate(self.current_image_paths):
        image = self.preprocess_images([image_path])
        output = self.model(image[0])
        predicted_class = self.class_dict[output.argmax().item()]
        self.result_labels[i].setText(f"Predicted Class: {predicted_class}")
        self.progress_bar.setValue((i+1)*20)

def display_images(self, image_paths):
    for i, image_path in enumerate(image_paths):
        image = QImage(image_path)
        image = image.scaled(300, 300, Qt.KeepAspectRatio)
        if i == 0:
            self.image_label_1.setPixmap(QPixmap.fromImage(image))
        elif i == 1:
            self.image_label_2.setPixmap(QPixmap.fromImage(image))
        elif i == 2:
            self.image_label_3.setPixmap(QPixmap.fromImage(image))
        elif i == 3:
            self.image_label_4.setPixmap(QPixmap.fromImage(image))
        elif i == 4:
            self.image_label_5.setPixmap(QPixmap.fromImage(image))

对这段代码也使用多线程：def get_image_files(folder): image_extensions = ['.jpg', '.jpeg', '.png'] # 定义图片扩展名 image_files = [] for root, dirs, files in os.walk(folder): for file in files: if os.path.splitext(file)[1].lower() in image_extensions: img_path = os.path.join(root, file) # 将每条数据保存到txt中 path_all_files = open('./all_files.txt','a') path_all_files.write(img_path+'\n') path_all_files.close() print(img_path) image_files.append(img_path) return image_files # 加载ONNX模型 ort_session = onnxruntime.InferenceSession('./best_weights.onnx') # 预处理输入图像 transform = transforms.Compose([ transforms.Resize((224, 224)), transforms.ToTensor(), transforms.Normalize((0.5,), (0.5,)) ]) # 创建线程池 executor = concurrent.futures.ThreadPoolExecutor() # 获取路径下所有图片 image_files = get_image_files('C:/Users/xyzhuge/Desktop/detect-mamaclouds-yolov5-v2/detect-mamaclouds-yolov5-linux-main/res/')

下面是对第二段代码使用多线程的示例：

import concurrent.futures

def get_image_files(folder):
    image_extensions = ['.jpg', '.jpeg', '.png']  # 定义图片扩展名
    image_files = []

    for root, dirs, files in os.walk(folder):
        for file in files:
            if os.path.splitext(file)[1].lower() in image_extensions:
                img_path = os.path.join(root, file)
                # 将每条数据保存到txt中
                path_all_files = open('./all_files.txt','a')
                path_all_files.write(img_path+'\n')
                path_all_files.close()
                print(img_path)
                image_files.append(img_path)

    return image_files

# 创建线程池
executor = concurrent.futures.ThreadPoolExecutor()

# 获取路径下所有图片
image_files = get_image_files('C:/Users/xyzhuge/Desktop/detect-mamaclouds-yolov5-v2/detect-mamaclouds-yolov5-linux-main/res/')

# 定义处理图片的函数
def process_image(image_file):
    # 加载图片
    image = Image.open(image_file)
    # 预处理
    input_data = transform(image).unsqueeze(0).numpy()
    # 运行推理
    ort_inputs = {ort_session.get_inputs()[0].name: input_data}
    ort_outputs = ort_session.run(None, ort_inputs)
    # 获取预测结果
    predicted_class = np.argmax(ort_outputs[0])
    print(f'Image: {image_file}')
    print(f'Predicted class: {predicted_class}')
    # 当为0时，删除图片
    if predicted_class == 0:
        # 将每条数据保存到txt中
        path_all_files = open('./del_files.txt','a')
        path_all_files.write(image_file+'\n')
        path_all_files.close()
        os.remove(image_file)
        print('Deleted')

# 提交任务给线程池
for image_file in image_files:
    executor.submit(process_image, image_file)

# 关闭线程池，等待所有任务完成
executor.shutdown()

这段代码与之前的示例类似，将每个图片的处理任务提交给线程池并行执行。注意在多线程环境下使用共享资源时需要进行适当的同步操作。同时，也请确保在适当的位置关闭文件和线程池，以避免资源泄漏。