init = tf.global_variables_initializer()
sess = tf.Session()
saver = tf.train.Saver()
saver.restore(sess, tf.train.latest_checkpoint('.'))
此部分代码编写时请注意先后顺序，顺序错乱会导致以下错误：
1.Can not load save_path when it is None
2.FailedPreconditionError
3.RuntimeError:Attempted to use a closed Session
每行代码前请注意格式，若格式混乱会导致IndentationError:unindent does not match any outer indentation level