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Consider deprecating/removing lambdarank_unbiased due to stateful objective and model-IO complexity

Status: Open.

#12302 In dmlc/xgboost;

· RAMitchell opened on Jul 14, 2026

rank:* with lambdarank_pair_method=mean is not checkpoint-resume deterministic

Status: Open.

#12301 In dmlc/xgboost;

· RAMitchell opened on Jul 14, 2026

[RFC] Column split deprecation/removal

Status: Open.

#12298 In dmlc/xgboost;

· RAMitchell opened on Jul 13, 2026

Support for missing/NaN values in multi-target labels for multi-output regression (multi_output_tree)

Status: Open.

#12295 In dmlc/xgboost;

· WXJT-79 opened on Jul 9, 2026

Using exact Hessian for multinomial logistic

feature-request

Status: Open.

#12278 In dmlc/xgboost;

· david-cortes opened on Jun 30, 2026

Structure of multi-output trees

Status: Open.

#12277 In dmlc/xgboost;

· david-cortes opened on Jun 30, 2026

R reverse dependencies failures.

Status: Open.

#12260 In dmlc/xgboost;

· trivialfis opened on Jun 20, 2026

Python wheels missing license file

Status: Open.

#12256 In dmlc/xgboost;

· david-cortes opened on Jun 18, 2026

Sum of hessians calculated incorrectly under hist method

Status: Open.

#12248 In dmlc/xgboost;

· david-cortes opened on Jun 15, 2026

References / explanations for contribution predictions

Status: Open.

#12241 In dmlc/xgboost;

· david-cortes opened on Jun 9, 2026

Generic Message of Error: * You are running 32-bit Python on a 64-bit OS

Status: Open.

#12227 In dmlc/xgboost;

· jayeshmanani opened on Jun 3, 2026

Support pixi as development environment.

Status: Open.

#12221 In dmlc/xgboost;

· trivialfis opened on May 23, 2026