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tensorflow
Jitesh Mohite
Jitesh Mohite

Reputation: 34250

Tensorflow tf.Variable not able to perform addition

I am able to perform addition using constant but not able to perform through tf.Variable

Below code is working fine when I am using constant for addition.

import tensorflow as tf

a = tf.constant(5)
b = tf.constant(6)

sess = tf.Session()
result = sess.run(a + b)
print(result)

But when I tried with tf.Variable it is not working, Here is mine code

import tensorflow as tf

a = tf.Variable(5)
b = tf.Variable(6)

sess = tf.Session()
result = sess.run(a + b)
print(result)

Can somebody help me ? Thanks !!!

Upvotes: 0

Views: 207

Answers (1)

akuiper
akuiper

Reputation: 215067

You need to initialize the variables firstly:

import tensorflow as tf
​
a = tf.Variable(5)
b = tf.Variable(6)
​    ​
sess = tf.Session()

Initialize variables:

sess.run(tf.global_variables_initializer())     

result = sess.run(a + b)

print(result)
11

You can read more about variable initialization here, which says Unlike tf.Tensor objects, a tf.Variable exists outside the context of a single session.run call. So Before you can use a variable, it must be initialized. The initialization is Session specific, which means whenever you start a new session, and want to use these variables, you'll have to initialize them firstly.

Upvotes: 2

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