James Lamb

[ci] [R-package] clang-18 jobs failing

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## Description Created from https://github.com/microsoft/LightGBM/pull/6357#issuecomment-1989972735. `r-debian-clang-devel` CI jobs are failing for clang 18, with these installation errors: ```text The following packages have unmet dependencies: clangd-18 : Depends: libabsl20220623t64 (>= 0~20220623.0-1)...

## Summary LightGBM currently has APIs to support two formats of sparse matrices: * CSC = "Compressed Sparse Column" * CSR = "Compressed Sparse Row" In the Python library `scipy`,...

spongebobcase.spongebobsay() prints two copies

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I installed `spongebobcase` 0.4.0 from PyPi today and ran this ```python import spongebobcase print(spongebobcase.spongebobsay("this is working")) ``` And got two spongebobs! 

[RFC] provide Python/R implementations of all the built-in objectives?

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## Summary Should we provide example Python (and maybe R) implementations of LightGBM's objective functions which exactly match the behavior of the builtin objectives from the C++ side? ## Motivation...

{lightgbm} v4.0.0 is coming

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👋 Hello! I'm James Lamb, one of the maintainers of LightGBM. *(@mayer79 and I have talked extensively over in LightGBM, but I haven't met the other maintainers/contributors here).* We were...

[FEA] add tests on image characteristics

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**Is your feature request related to a problem? Please describe.** Images published from this repo are intended for use in a wide variety of contexts. For example, they're used in...

{lightgbm} v4.0.0 is coming

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👋 Hello! I'm James, one of the maintainers of LightGBM. We were excited to see `{EIX}` show up as a "reverse suggests" on https://cran.r-project.org/web/packages/lightgbm/index.html. Thanks so much for enhancing what...

[python-package] make LGBMDeprecationWarning inherit from DeprecationWarning

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Contributes to #6435 . `LGBMDeprecationWarning` was added 7 years ago, in #1046. That was done because Python's builtin `DeprecationWarning` is not shown by default. PEP 565, accepted in November 2017,...

Contributes to #6435. Adds deprecation warnings for all the cases mentioned in #6435, and some other changes that flow from that: * promotes `categorical_feature` and `colnames` to top-level arguments of...

Contributes to #6436. See that issue for much more discussion. This proposes deprecating HDFS support, for the reasons described in #6436. I'd like to get this into the next release...