tensorflow遇到的小问题

tensorflow 2以后好多没用的步骤都省略了，嘻嘻。记录一下小bug

1.module ‘tensorflow’ has no attribute ‘assign’
2.module ‘tensorflow’ has no attribute ‘session’
3.module ‘tensorflow’ has no attribute ‘placeholder’
可以直接进行加减乘，无需运行和赋值操作。

3.的解决方案
import tensorflow.compat.v1 as tf
tf.disable_eager_execution()
input1 = tf.placeholder(tf.float32)