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# Licensed under the Apache License, Version 2.0 (the "License");
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# https://www.apache.org/licenses/LICENSE-2.0
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学习目标：在浏览器中运行 TensorFlow 程序。
以下代码块为“Hello World”TensorFlow 程序。
其中包含初始化代码（导入 TensorFlow 模块并启用“eager execution”，我们将在后续练习中详细介绍此操作），然后输出“Hello, world!”字符串常量。
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from __future__ import print_function
import tensorflow as tf
try:
tf.contrib.eager.enable_eager_execution()
except ValueError:
pass # enable_eager_execution errors after its first call
tensor = tf.constant('Hello, world!')
tensor_value = tensor.numpy()
print(tensor_value)