这里的问题是什么.它给出了一个错误.我不知道该怎么办.我只是从网络教程复制过去的代码.至于错误，我不能继续.它说名称'数据集'未定义：

from keras.models import Sequential
from keras.layers import Conv2D
from keras.layers import MaxPooling2D
from keras.layers import Flatten
from keras.layers import Dense
import numpy as np
import matplotlib.patches as mpatches
import matplotlib.pyplot as plt
from tensorflow.examples.tutorials.mnist import input_data

import tensorflow as tf

a = tf.truncated_normal([16,128,128,3])
sess = tf.Session()
sess.run(tf.initialize_all_variables())
sess.run(tf.shape(a))

3

b=tf.reshape(a,[16,49152])
sess.run(tf.shape(b))

classes = ['dogs', 'cats']
num_classes = len(classes)

train_path='C:/Users/ZERO/Desktop/img test/cat vs dog/convnet-image-classifier-master/test/resources/images/training/'

validation_size = 0.2

# batch size
batch_size = 16

data = datasets.read_train_sets(train_path, img_size, classes, validation_size=validation_size)