diff --git a/doc/parameter.rst b/doc/parameter.rst index abd5f39d5e69..00f0eaea6193 100644 --- a/doc/parameter.rst +++ b/doc/parameter.rst @@ -489,7 +489,7 @@ Parameters for learning to rank (``rank:ndcg``, ``rank:map``, ``rank:pairwise``) These are parameters specific to learning to rank task. See :doc:`Learning to Rank ` for an in-depth explanation. -* ``lambdarank_pair_method`` [default = ``mean``] +* ``lambdarank_pair_method`` [default = ``topk``] How to construct pairs for pair-wise learning. @@ -502,6 +502,8 @@ These are parameters specific to learning to rank task. See :doc:`Learning to Ra * ``lambdarank_normalization`` [default = ``true``] + .. versionadded:: 2.1.0 + Whether to normalize the leaf value by lambda gradient. This can sometimes stagnate the training progress. * ``lambdarank_unbiased`` [default = ``false``]