from keras.datasets import mnist import numpy as np from keras import models from keras import layers from keras.models import load model import matplotlib.pyplot as plt from keras import optimizers1.4.1.1x train y train x test y test mnist.load data下载数据集print shape of x train str x train.shape print shape of x test str x test.shape print shape of y train str y train.shape print shape of y test str y test.shape1.4.1.2x train vec total x trai