TensorFlow中的session会话控制

import tensorflow._api.v2.compat.v1 as tf
tf.disable_v2_behavior()
import os
os.environ['TF_CPP_MIN_LOG_LEVEL'] = '2'
import numpy as np

matrix1 = tf.constant([[3,3]])
matrix2 = tf.constant([[2],
                       [2]])
product = tf.matmul(matrix1,matrix2)


# sess = tf.Session()
# result = sess.run(product)
# print(result)
# sess.close()

with tf.Session() as sess:
    result2 = sess.run(product)
    print(result2)