import numpy as np import tensorflow as tf from tensorflow.keras.models import Sequential from tensorflow.keras.layers import Conv2D, MaxPooling2D, Flatten, Dense from tensorflow.keras.datasets import mnist # データセットの準備 (x_train, y_train), (x_test, y_test) = mnist.load_data() x_train = x_train[:, :, :, np.newaxis].astype("float32") / 255.0 # (60000, 28, 28, 1) x_test = x_test[:, :, :, np.newaxis].a