How to use orion in conjunction with hydra?

[sophie-xhonneux]

Would it be possible to expand the documentation to explain how to use orion with hydra together for experiment management and hyper-parameter search?

[Delaunay]

Because it is a plugin for hydra you can simply follow the hydra examples.
It tries to follow the hydra way and minimize the amount a new concepts it could introduce.
In fact the plugin use the exact same example as the builtin nevergrad plugin.

So there ends up not being a lot of orion specific things to document.
The plugin readme discusses how relative/absolute paths are handled which is important if you desire to resume your HPO,

There is also a section showing you how to launch your hydra app to do an HPO but as noted above this is just standard hydra and nothing new is introduced.

[sophie-xhonneux]

Well I find there a couple orion specific things with regards to the database config, because orion requires a config file to access the database and visualise the results and I am unable to do this hydra orion sweep config, so an example how to make that work would be really nice because it is non-trivial.

Similarly, hydra now makes orion create a database per multirun and various questions to how that should be set up also exist. I really don't feel like it's simple an example in the documentation would be really appreciated.