Can we get hparams given output directories?

> @dustinvtran
> @GhassenJ @JeremyNixon
>
> We can get it from the internal experiment management interface. We could try to establish a link from each output directory to each experiment ID. Alternatively, we could just export all the hparams to each output directory, although that does lead to duplicate code if that already exists in the experiment UI.

https://github.com/google/edward2/issues/280