tensorflow 简单的例子

利用feed注入机制实现加减
代码如下：

import tensorflow as tf
a = tf.placeholder(tf.int16)
b = tf.placeholder(tf.int16)
add = tf.add(a,b)
mul = tf.multiply(a,b)
with tf.Session() as sess:
    print("%i" %sess.run(add,feed_dict={a:30,b:40})