加载 csv 和 pytorch 中的图像数据集

Question

I am doing image classification with PyTorch. I have a separate Images folder and train and test csv file with images ids and labels. I don't have any an idea about how to combine those images and ID and converting into tensors.

1. train.csv: contains all ID of Image like 4325.jpg, 2345.jpg,…so on and contains Labels like cat,dog.
2. Image_data: contains all the images of with ID name.

Answer 1

You can create custom dataset class by inherting pytorch's torch.utils.data.Dataset .

The assumption for the following custom dataset class is

• csv file format is
  
  

filename	label
4325.jpg	cat
2345.jpg	dog

• All images are inside images folder .

class CustomDataset(torch.utils.data.Dataset):
    def __init__(self, csv_path, images_folder, transform = None):
        self.df = pd.read_csv(csv_path)
        self.images_folder = images_folder
        self.transform = transform
        self.class2index = {"cat":0, "dog":1}

    def __len__(self):
        return len(self.df)
    def __getitem__(self, index):
        filename = self.df[index, "FILENAME"]
        label = self.class2index[self.df[index, "LABEL"]]
        image = PIL.Image.open(os.path.join(self.images_folder, filename))
        if self.transform is not None:
            image = self.transform(image)
        return image, label
        

Now you can use this class to load the training and test dataset using both csv file and image folder.

train_dataset = CustomDataset("path - to - train.csv", "path - to - images - folder"  )
test_dataset = CustomDataset("path - to - test.csv", "path - to - images - folder"  )


image, label = train_dataset[0]

Answer 2

I am doing image classification with PyTorch. I have a separate Images folder and train and test csv file with images ids and labels. I don't have any an idea about how to combine those images and ID and converting into tensors.

1. train.csv: contains all ID of Image like 4325.jpg, 2345.jpg,…so on and contains Labels like cat,dog.
2. Image_data: contains all the images of with ID name.