tf.sign和tf.reduce_sum
2017-04-30 11:41
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tensorflow中两个经常用到的操作,理解的不是很透彻,故在此做标记:
![](https://img-blog.csdn.net/20170430113721535?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvYXBwbGVtbA==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
![](https://img-blog.csdn.net/20170430113735925?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvYXBwbGVtbA==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
关于reduce_sum的维度问题也容易让人迷惑,特找来好用的图示,一看即懂:
![](https://img-blog.csdn.net/20170430113909232?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvYXBwbGVtbA==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
为了加深影响,给出简单code
执行结果如下:
![](https://img-blog.csdn.net/20170430114123470?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvYXBwbGVtbA==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
参考资料:
https://www.zhihu.com/question/51325408?from=profile_question_card
http://blog.csdn.net/lenbow/article/details/52152766
关于reduce_sum的维度问题也容易让人迷惑,特找来好用的图示,一看即懂:
为了加深影响,给出简单code
import numpy as np import tensorflow as tf inputs = [[1,0,2],[3,2,4]] inputs = np.array(inputs) A = tf.sign(inputs) B = tf.reduce_sum(A, reduction_indices=1) with tf.Session() as sess: print(sess.run(A)) print(sess.run(B))
执行结果如下:
参考资料:
https://www.zhihu.com/question/51325408?from=profile_question_card
http://blog.csdn.net/lenbow/article/details/52152766
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