Day 3 跑一下 Tensorflow 范例

安装 tensorflow-gpu (如果自己电脑没有 GPU 就装 CPU 版)

pip install tensorflow-gpu

跑 tensorflow 的初学者范例。
https://www.tensorflow.org/tutorials/quickstart/beginner

# a02_tf_mnist.py
import tensorflow as tf

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

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')
])

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)

参考资料
https://www.tensorflow.org/tutorials/quickstart/beginner