对我来说，解决方案是将 h5py 包降级(在我的例子中是 2.10.0)，显然只放回了 Keras 和 Tensorflow到正确的版本是不够的.

For me the solution was downgrading the h5py package (in my case to 2.10.0), apparently putting back only Keras and Tensorflow to the correct versions was not enough.