tensorflow 报错ValueError: tf.enable_eager_execution must be called at program startup.

报错1：

AttributeError: ‘RefVariable’ object has no attribute ‘_id’

报错2：

ValueError: tf.enable_eager_execution must be called at program startup.

解决：

在导入tensorflow之后，整个jupyter代码之前运行如下代码：
tf.enable_eager_execution()