[ENH] Implement Proximity Tree classifier using aeon distances

[itsdivya1309]

Related to: #159

We implemented the ProximityTree class using aeon distances.
This will be used to create the Proximity Forest class.

• Coded the ProximityTree class
• Wrapped Gini functions with Numba
• Wrote unit tests
• Added the class to docs/api_reference

[aeon-actions-bot]

Thank you for contributing to aeon

I have added the following labels to this PR based on the title: [ $\color{#FEF1BE}{\textsf{enhancement}}$ ].
I have added the following labels to this PR based on the changes made: [ $\color{#BCAE15}{\textsf{classification}}$ ]. Feel free to change these if they do not properly represent the PR.

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[TonyBagnall]

this is good. From our end @MatthewMiddlehurst we should set up a pipeline for running experiments to check equivalence to the Java results, as that was the heart of the problem last time. No rush of course, project has not started yet :)

[itsdivya1309]

I have completed the framework for Proximity Tree along with it's API.

[baraline]

A few comments on “surface” content, I'll have a proper look at the algorithmic correctness a bit later

[MatthewMiddlehurst]

Looks good for the most part, left a few comments. We may revisit this later down the line if there are issues, but appears to be fine for now.

I would add this to the API documentation in docs/ in this PR.

There are some if statements here which are not covered by testing. Not going to block this PR because of them, but if you find the time and can figure out how to get to them reasonably it would be nice. https://app.codecov.io/gh/aeon-toolkit/aeon/pull/1566/blob/aeon/classification/distance_based/_proximity_tree.py

[MatthewMiddlehurst]

Try merging the main branch for the pre-commit test, I will take a further look if it does not work after.

[itsdivya1309]

Try merging the main branch for the pre-commit test, I will take a further look if it does not work after.

I have merged the main branch, but it is still failing.

[TonyBagnall]

non blocking changes from me, looks good

[MatthewMiddlehurst]

LGTM

[TonyBagnall]

lgtm, thanks