本文注意： 
1. placeholder应用与feed_dcit是绑定的 
2. 在r0.12版本中tensorflow的乘法是tensorflow.multiply(x,y)

        # -*- coding: utf-8 -*-
        """
        Created on Wed May 3 11:05:30 2017
        E-mail: Eric2014_Lv@sjtu.edu.cn
        @author: DidiLv
        """
        import tensorflow as tf
        input1 = tf.placeholder(tf.float32) # float32 type variabvle by dfault
        input2 = tf.placeholder(tf.float32)
        output = tf.multiply(input1,input2) # need to be notice
        with tf.Session() as sess:
         print(sess.run(output,feed_dict={input1:7, input2:2}))
    
   

    
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