import tensorflow as tf

# import os

# os.environ['TF_CPP_MIN_LOG_LEVEL']='2'

a = tf.placeholder(tf.int16)

b = tf.placeholder(tf.int16)

add = tf.add(a, b)

mul = tf.multiply(a, b)

config = tf.ConfigProto()

config.gpu_options.allow_growth = True

with tf.Session(config=config) as sess:

    print(sess.run(add, feed_dict={a: 3, b: 4}))

    print(sess.run(mul, feed_dict={a: 3, b: 4}))

    print(sess.run([add, mul], feed_dict={a: 3, b: 4}))