tensor_simple_operation.py

import tensorflow as tf

# create a constant 2X2 matrix
tensor_1 = tf.constant([[1., 2.], [3.,4]])

tensor_2 = tf.constant([[5.,6.],[7.,8.]])

# create a matrix multiplication operation
output_tensor = tf.matmul(tensor_1, tensor_2)

# have to run the graph using a session
sess = tf.Session()

result = sess.run(output_tensor)
print(result)

sess.close()

session.close() should be sess.close()

@ktkirk Thank you. Updated with fix.