data – a 10000x3072 numpy array of uint8s. Each row of the array stores a 32x32 colour image. The first 1024 entries contain the red channel values, the next 1024 the green, and the final 1024 the blue. The image is stored in row-major order, so that the first 32 entries of the array are the red channel values of the first row of the image.
labels – a list of 10000 numbers in the range 0-9. The number at index i indicates the label of the ith image in the array data.

• data, 存放图像数据文件，是一个nx3072的数组；
• labels, 存放图像对应的label，是一个nx1的数组；
• batch_label, 说明信息；
• filenames, 文件名列表。