Variables and Session

07 May 2019

import tensorflow as tf

import os

# Just disables the warning, doesn't enable AVX/FMA
os.environ['TF_CPP_MIN_LOG_LEVEL'] = '2'

a = tf.ones((2, 2))
b = tf.Variable(tf.zeros((2, 2)), name = 'weights')

with tf.Session() as sess:
    print(sess.run(a))
    sess.run(tf.initialize_all_variables()) # commenting out this line will throw exception
    print(sess.run(b))

[[1. 1.]
 [1. 1.]]
WARNING:tensorflow:From /Users/rajacsp/anaconda3/envs/py36/lib/python3.6/site-packages/tensorflow/python/util/tf_should_use.py:193: initialize_all_variables (from tensorflow.python.ops.variables) is deprecated and will be removed after 2017-03-02.
Instructions for updating:
Use `tf.global_variables_initializer` instead.
[[0. 0.]
 [0. 0.]]

Notes

Tensorflow variables must be initialized before they have values