No loop matching the specified signature and casting was found for ufunc true_divide 解决方案

x_train = np.array(x_train)
x_test = np.array(x_test)

#normalize inputs between[0,1]
x_train/=255
x_test/=255

上式会报错

改成下式就好了

x_train = np.array(x_train,'float32')
x_test = np.array(x_test,'float32')

#normalize inputs between[0,1]
x_train/=255
x_test/=255