This reverts commit 3562219.

This reverts commit d3f15ad.

…nto stream

…nto stream

…ecessary refactorings to enable downstream functionality (scikit-learn#32)

#### Reference Issues/PRs
This is the most up-to-date PR branch to consolidate all proposed
refactor changes that work with:

- unsupervised trees
- oblique trees
- no performance/runtime regressions against main

#### What does this implement/fix? Explain your changes.
Incorporates refactors to:

Internal Cython of scikit-learn's:
- criterion
- splitter
- tree

Internals of Python in scikit-learns:
- python Tree

Adds the basic implementation of oblique trees. The implementation of
oblique trees has been tested on all sklearn's `check_estimator` testing
function and has error-checking bounds for the new hyperparameter
introduced, which is `feature_combinations` that defaults to ``min(1.5,
n_features)``.

TODO:
1. [ ] ~Add honest support for trees (splitting the data at the Python
API level)~
2. [x] Build wheels
3. [ ] ~Brainstorm unit-tests, or weekly checks to determine when our
fork is out-of-date compared to upstream sklearn~
4. [x] Revamp README for the fork

#### Any other comments?

[cd build]

---------

Signed-off-by: Adam Li <adam2392@gmail.com>
Co-authored-by: Chester Huynh <chester.huynh924@gmail.com>
Co-authored-by: Parth Vora <pvora4@jhu.edu>

#### Reference Issues/PRs
Fixes README and wheel building


---------

Signed-off-by: Adam Li <adam2392@gmail.com>

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#### What does this implement/fix? Explain your changes.


#### Any other comments?


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---------

Signed-off-by: Adam Li <adam2392@gmail.com>

Signed-off-by: Adam Li <adam2392@gmail.com>

Signed-off-by: Adam Li <adam2392@gmail.com>

… fork

Signed-off-by: Adam Li <adam2392@gmail.com>

Signed-off-by: Adam Li <adam2392@gmail.com>

Signed-off-by: Adam Li <adam2392@gmail.com>

Signed-off-by: Adam Li <adam2392@gmail.com>

Signed-off-by: Adam Li <adam2392@gmail.com>

Signed-off-by: Adam Li <adam2392@gmail.com>

Signed-off-by: Adam Li <adam2392@gmail.com>

Signed-off-by: Adam Li <adam2392@gmail.com>

Signed-off-by: Adam Li <adam2392@gmail.com>

Signed-off-by: Adam Li <adam2392@gmail.com>

…urned on (scikit-learn#45)

#### Reference Issues/PRs
Addresses the quantile-trees part of:
neurodata/treeple#29


#### What does this implement/fix? Explain your changes.
1. Stores for each leaf node a 2D numpy array of the y-samples (remember
`y` is (n_samples, n_outputs))
2. Does this all the way in Criterion
3. Only supports supervised tree/splitter/criterion
4. merges in `main` changes.

#### Any other comments?


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convincing, etc. or more likely the reviewers are simply busy. In either
case, we ask for your understanding during the review process.
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---------

Signed-off-by: Adam Li <adam2392@gmail.com>

Signed-off-by: Adam Li <adam2392@gmail.com>

… into submodulev2

Signed-off-by: Adam Li <adam2392@gmail.com>

Signed-off-by: Adam Li <adam2392@gmail.com>

Signed-off-by: Adam Li <adam2392@gmail.com>

Signed-off-by: Adam Li <adam2392@gmail.com>

Signed-off-by: Adam Li <adam2392@gmail.com>

Signed-off-by: Adam Li <adam2392@gmail.com>

Signed-off-by: Adam Li <adam2392@gmail.com>