写一个用Python图像识别的代码用卷积神经网络算法

import numpy as np import matplotlib.pyplot as plt from keras.preprocessing.image import ImageDataGenerator from keras.models import Sequential from keras.layers import Conv2D, MaxPooling2D from keras.layers import Activation, Dropout, Flatten, Dense# 设置图片的尺寸 img_width, img_height = 150, 150# 设置数据集