__iter__() is only supported inside of tf.function or when eager execution is enabled

运行tensorflow代码出现这个

__iter__() is only supported inside of tf.function or when eager execution is enabled

 按照字面意思就是需要增加eager execution，于是这样进行修改：

import tensorflow.contrib.eager as tfe
tfe.enable_eager_execution()

但会出现错误：

AttributeError: module 'tensorflow.contrib.eager' has no attribute 'enable_eager_execution'

 在github里面看到有人遇到过这个问题，实际是版本的锅，这样就ok

import tensorflow as tf
tf.enable_eager_execution()

注：我使用的是tensorflow1.15