Atanas Dimitrov

Fix pypi description

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Currently the pypi description for the package is wrong. This PR makes it the same as the about section of the repo.

[python-package] Introduce `refit_tree_manual` to `Booster` class.

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This PR strives to introduce a way to refit a tree manually, for example during a callback. Currently the only related functionality is using `set_leaf_output`, however this does not update...

Expose `ObjectiveFunction` class to the Python API

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## Summary The feature in question is related to the fact that there seems to be no way to examine the `(grad, hess)` pair from the user facing Python API....

[c++] Fix `dump_model()` information for root node

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This PR corrects the output of `dump_model()` and other dump-related functions like `trees_to_dataframe()`. There are 2 fixes implemented: 1. The current `Tree::Split` implementation incorrectly saves the old leaf output value...

[python-package] Expose `ObjectiveFunction` class

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Provides a way to invoke the builtin functions outside of training. Implements access to gradient computations and output conversion methods. This is a minimal implementation of #6585.

Duplicate of #201 because of missing access to the repo Since we currently "bless" the reference and onnxruntime implementations as the only way to propagate value internally, this PR refactors...