Make `from_dict` more flexible, and add `from_pytree`

[ColCarroll]

This also makes from_dict work for nested dictionaries. I joined the keys with double underscores because using a . would break attribute access (like, it would still work, but you'd use idata.posterior['var.x.y'], instead of idata.posterior.var__x__y)

Hopefully this is a no-op for most code, but it should make arviz work automatically with namedtuples or dataclasses.

---

:books: Documentation preview :books:: https://arviz--2291.org.readthedocs.build/en/2291/

[ColCarroll]

I'll add that this adds a requirement on dm-tree. I'd rather have used jax.tree_utils, but that requires all of jax (~1.4MB) instead of just dm-tree (~35kb).

[ahartikainen]

Will this affect python 3.12 use? Probably not(?)

[ColCarroll]

It looks like maybe: https://github.com/google-deepmind/tree/issues/109

I gave https://github.com/google-deepmind/tree/pull/111 a try.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 96.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 86.80%. Comparing base (3fc5962) to head (bd03a88). Report is 2 commits behind head on main.

Files	Patch %	Lines
arviz/data/converters.py	66.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2291 +/- ## ======================================= Coverage 86.79% 86.80% ======================================= Files 123 123 Lines 12722 12743 +21 ======================================= + Hits 11042 11061 +19 - Misses 1680 1682 +2 ```

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[ColCarroll]

I tried it out, and it fails when trying to install dm-tree on python 3.12, because it requires CMake. Once you conda install CMake and install xcode on OSX, you can install from source, but that's probably too big of a lift for users, and we should wait on this until dm-tree builds a wheel.

Given expected workloads in arviz, we might just write our own flatten_with_path function in pure python. I'll think about that if there's no motion on the other PR.

[ColCarroll]

Update: The PR was merged for dm-tree, but we need to wait on a pypi release.

[ColCarroll]

Hey! They sneakily added PyPI wheels for 3.12 to dm-tree. I think this is now ready to go.

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[ColCarroll]

I think this is ready again.

[ahartikainen]

if @OriolAbril approves I think we can merge

[OriolAbril]

I want to make a patch release before merging, maybe a couple doc changes, then I'll merge.

[ColCarroll]

Sounds good!

bayeux will probably pin to the next release that has this in it, since this example produces a dictionary of parameters that the current az.from_dict fails to parse correctly.

[OriolAbril]

I think it should be done now. Docs used to look like this:

Now they are this: https://arviz--2291.org.readthedocs.build/en/2291/api/generated/arviz.dict_to_dataset.html

[ColCarroll]

LGTM!

On Wed, Mar 13, 2024, 3:16 PM Oriol Abril-Pla @.***> wrote:

I think it should be done now. Docs used to look like this:

Captura.de.pantalla.de.2024-03-13.19-42-15.png (view on web) https://github.com/arviz-devs/arviz/assets/23738400/35f4b904-ac37-4805-bb52-37dcf6439f90

Now they are this: https://arviz--2291.org.readthedocs.build/en/2291/api/generated/arviz.dict_to_dataset.html

— Reply to this email directly, view it on GitHub https://github.com/arviz-devs/arviz/pull/2291#issuecomment-1995455446, or unsubscribe https://github.com/notifications/unsubscribe-auth/AARQOEH3YJBX5ZB3GZQF5ILYYCQXHAVCNFSM6AAAAAA7LNJR62VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSOJVGQ2TKNBUGY . You are receiving this because you authored the thread.Message ID: @.***>

[papoteur-mga]

Hello, This is not a cool dependency for Linux distro. Building dm-tree from source needs to download at build time pybind11. However, distros prohibit any download at build time, thus the build fails. The build does not use a library provided by the distro.

[ColCarroll]

Hi @papoteur-mga -- thanks for chiming in, but I'm not sure what this means!

• Which Linux distro?
• Why is a linux distro building Python libraries from source?
• Is dm-tree impossible to use there?
• Is this really a dm-tree issue?
• Is there a different way we could achieve this functionality. I know we could depend on jax and use jax.tree, but that seems like a heavier dependency.

[papoteur-mga]

Hi @papoteur-mga -- thanks for chiming in, but I'm not sure what this means!

* Which Linux distro?

Mageia

* Why is a linux distro building Python libraries from source?

Python packages are included in the distro to be easily installed, in particular as dependency of any application. The most of the packages are tagged as being open source. These packages should then be built to be sure there are really open source. This is also a way to minimize the risk that faulty code is introduced.

* Is `dm-tree` impossible to use there?

* Is this really a `dm-tree` issue?

Yes, but I finally found a way by patching the cmake configuration files in dm-tree to use shared libraries. https://svnweb.mageia.org/packages/cauldron/python-dm-tree/current/SOURCES/0001-use-system-libraries.patch?view=markup

* Is there a different way we could achieve this functionality. I know we could depend on `jax` and use `jax.tree`, but that seems like a heavier dependency.

I have no idea about that.

[ColCarroll]

Thank you for the response! Is it right to say you're here to advocate for mageia users, and not (specifically) as a user of statistical diagnostics?

I have a particular interest in the functionality that dm-tree provides, since it allows for running diagnostics in some of my own work with bayesian neural nets.

It sounds like maybe this is all set from the patch you added? If it isn't, I can try to explore using some other library to achieve my goals (but I suspect it may introduce more/different problems!)