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tensorflow2版本学习教程1-mnist数据集手写字体
阅读量:141 次
发布时间:2019-02-28

本文共 683 字,大约阅读时间需要 2 分钟。

import tensorflow as tf# 载入并准备好 MNIST 数据集。将样本从整数转换为浮点数mnist = tf.keras.datasets.mnist(x_train, y_train), (x_test, y_test) = mnist.load_data()x_train, x_test = x_train / 255.0, x_test / 255.0# 将模型的各层堆叠起来,以搭建 tf.keras.Sequential 模型。为训练选择优化器和损失函数model = tf.keras.models.Sequential([  tf.keras.layers.Flatten(input_shape=(28, 28)),  tf.keras.layers.Dense(128, activation='relu'),  tf.keras.layers.Dropout(0.2),  tf.keras.layers.Dense(10, activation='softmax')])# 训练并验证模型model.compile(optimizer='adam',              loss='sparse_categorical_crossentropy',              metrics=['accuracy'])model.fit(x_train, y_train, epochs=5)model.evaluate(x_test,  y_test, verbose=2)

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