tensorflow随笔-条件循环控制（10）

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#!/usr/bin/env python2
# -*- coding: utf-8 -*-
"""
Created on Mon Aug 27 11:16:32 2018
@author: myhaspl
"""
 
import tensorflow as tf
import collections
Pair = collections.namedtuple('Pair', 'j, k')
ijk_0 = (tf.constant(0), Pair(tf.constant(1), tf.constant(2)))
c = lambda i, p: i < 10
b = lambda i, p: (i + 1, Pair((p.j + p.k), (p.j - p.k)))
ijk_final = tf.while_loop(c, b, ijk_0)


sess=tf.Session()
with sess:
    print sess.run(ijk_final)

(10, Pair(j=32, k=64))

循环，以命名元组Pair的值为初值，每次循环将其j更新为j+k，k更新为j-k，并返回一个新的命名元组对象。

>>> from collections import namedtuple
>>> Point = namedtuple('Point', ['x', 'y'])  
>>> p = Point(12, y=16) 
>>> p
Point(x=12, y=16)
>>> p.x + p.y
28
>>> p[0] + p[1]  
28
>>> x, y = p  
>>> x
12
>>> y
16