这是对单个文件进行预测“import os import json import torch from PIL import Image from torchvision import transforms import matplotlib.pyplot as plt from model import convnext_tiny as create_model def main(): device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu") print(f"using {device} device.") num_classes = 5 img_size = 224 data_transform = transforms.Compose( [transforms.Resize(int(img_size * 1.14)), transforms.CenterCrop(img_size), transforms.ToTensor(), transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225])]) # load image img_path = "../tulip.jpg" assert os.path.exists(img_path), "file: '{}' dose not exist.".format(img_path) img = Image.open(img_path) plt.imshow(img) # [N, C, H, W] img = data_transform(img) # expand batch dimension img = torch.unsqueeze(img, dim=0) # read class_indict json_path = './class_indices.json' assert os.path.exists(json_path), "file: '{}' dose not exist.".format(json_path) with open(json_path, "r") as f: class_indict = json.load(f) # create model model = create_model(num_classes=num_classes).to(device) # load model weights model_weight_path = "./weights/best_model.pth" model.load_state_dict(torch.load(model_weight_path, map_location=device)) model.eval() with torch.no_grad(): # predict class output = torch.squeeze(model(img.to(device))).cpu() predict = torch.softmax(output, dim=0) predict_cla = torch.argmax(predict).numpy() print_res = "class: {} prob: {:.3}".format(class_indict[str(predict_cla)], predict[predict_cla].numpy()) plt.title(print_res) for i in range(len(predict)): print("class: {:10} prob: {:.3}".format(class_indict[str(i)], predict[i].numpy())) plt.show() if name == 'main': main()”，改为对指定文件夹下的左右文件进行预测，并绘制混淆矩阵，

好的，为了实现您的需求，您需要进行以下几个步骤：

1. 加载模型和类别标签：

您需要在代码中加载您的模型和类别标签。您可以使用之前的代码中的方式来加载它们，只需要做一些小的改动即可。例如，您需要将模型和类别标签的路径作为参数传递给您的函数。

2. 加载测试集：

您需要加载您的测试集。您可以使用 `torchvision.datasets.ImageFolder` 来加载测试集。这个函数会将每个文件夹中的所有图像文件都加载到一个 tensor 中，并自动为每个文件夹分配一个标签。

3. 进行预测：

您需要对测试集中的每个图像进行预测，并将预测结果与真实标签进行比较。您可以使用之前的代码中的方式来预测每个图像，只需要做一些小的改动即可。例如，您需要将预测结果保存到一个列表中，并将真实标签保存到另一个列表中。

4. 绘制混淆矩阵：

最后，您需要使用预测结果和真实标签来绘制混淆矩阵。您可以使用 `sklearn.metrics.confusion_matrix` 来计算混淆矩阵，并使用 `matplotlib` 来绘制它。

下面是修改后的代码示例：

import os
import json
import torch
from PIL import Image
from torchvision import transforms
import matplotlib.pyplot as plt
from sklearn.metrics import confusion_matrix
import numpy as np
from model import convnext_tiny as create_model

def predict_folder(model_path, json_path, folder_path):
    device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu")
    print(f"using {device} device.")
    num_classes = 5
    img_size = 224

    data_transform = transforms.Compose([
        transforms.Resize(int(img_size * 1.14)),
        transforms.CenterCrop(img_size),
        transforms.ToTensor(),
        transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225])
    ])

    # load class_indict json
    with open(json_path, "r") as f:
        class_indict = json.load(f)

    # create model
    model = create_model(num_classes=num_classes).to(device)

    # load model weights
    model.load_state_dict(torch.load(model_path, map_location=device))
    model.eval()

    y_true = []
    y_pred = []

    for root, dirs, files in os.walk(folder_path):
        for file in files:
            if file.endswith(".jpg") or file.endswith(".jpeg"):
                img_path = os.path.join(root, file)
                assert os.path.exists(img_path), "file: '{}' dose not exist.".format(img_path)

                img = Image.open(img_path)

                # [N, C, H, W]
                img = data_transform(img)

                # expand batch dimension
                img = torch.unsqueeze(img, dim=0)

                # predict class
                with torch.no_grad():
                    output = torch.squeeze(model(img.to(device))).cpu()
                    predict = torch.softmax(output, dim=0)
                    predict_cla = torch.argmax(predict).numpy()

                y_true.append(class_indict[os.path.basename(root)])
                y_pred.append(predict_cla)

    # plot confusion matrix
    cm = confusion_matrix(y_true, y_pred)
    fig, ax = plt.subplots(figsize=(5, 5))
    ax.imshow(cm, cmap=plt.cm.Blues, aspect='equal')
    ax.set_xlabel('Predicted label')
    ax.set_ylabel('True label')
    ax.set_xticks(np.arange(len(class_indict)))
    ax.set_yticks(np.arange(len(class_indict)))
    ax.set_xticklabels(class_indict.values(), rotation=90)
    ax.set_yticklabels(class_indict.values())
    ax.tick_params(axis=u'both', which=u'both',length=0)
    for i in range(len(class_indict)):
        for j in range(len(class_indict)):
            text = ax.text(j, i, cm[i, j], ha="center", va="center", color="white" if cm[i, j] > cm.max() / 2. else "black")
    fig.tight_layout()
    plt.show()

if __name__ == '__main__':
    # set the paths for the model, class_indict json, and test data folder
    model_path = './weights/best_model.pth'
    json_path = './class_indices.json'
    folder_path = './test_data'

    predict_folder(model_path, json_path, folder_path)

请注意，这个函数的参数需要您自己根据您的实际情况进行设置，以匹配模型、类别标签和测试集的路径。