From dbc5c9b82dd12581fc9842088e8605e560df583f Mon Sep 17 00:00:00 2001 From: Far0n Date: Sat, 5 Sep 2015 12:36:42 +0200 Subject: [PATCH 1/3] alpha & lambda for gbtree alpha & lambda descriptions to "Parameters for Tree Booster" added (issue #466) --- doc/parameter.md | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/doc/parameter.md b/doc/parameter.md index 228b11780..8d05b9b6c 100644 --- a/doc/parameter.md +++ b/doc/parameter.md @@ -46,6 +46,10 @@ Parameters for Tree Booster * colsample_bytree [default=1] - subsample ratio of columns when constructing each tree. - range: (0,1] +* lambda [default=0] + - L2 regularization term on weights +* alpha [default=0] + - L1 regularization term on weights Parameters for Linear Booster ----------------------------- From a9f884bd47b49751337b5473e6e728909c19e852 Mon Sep 17 00:00:00 2001 From: Far0n Date: Sat, 5 Sep 2015 21:50:53 +0200 Subject: [PATCH 2/3] alpha = 1 as default value for gbtree --- doc/parameter.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/doc/parameter.md b/doc/parameter.md index 8d05b9b6c..86eda2202 100644 --- a/doc/parameter.md +++ b/doc/parameter.md @@ -48,7 +48,7 @@ Parameters for Tree Booster - range: (0,1] * lambda [default=0] - L2 regularization term on weights -* alpha [default=0] +* alpha [default=1] - L1 regularization term on weights Parameters for Linear Booster From cfcb1fc491d166474777c3581d52af9d6124057d Mon Sep 17 00:00:00 2001 From: Far0n Date: Sat, 5 Sep 2015 21:53:37 +0200 Subject: [PATCH 3/3] default values for gbtree: lambda=1, alpha=0 --- doc/parameter.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/doc/parameter.md b/doc/parameter.md index 86eda2202..ba0a18870 100644 --- a/doc/parameter.md +++ b/doc/parameter.md @@ -46,9 +46,9 @@ Parameters for Tree Booster * colsample_bytree [default=1] - subsample ratio of columns when constructing each tree. - range: (0,1] -* lambda [default=0] +* lambda [default=1] - L2 regularization term on weights -* alpha [default=1] +* alpha [default=0] - L1 regularization term on weights Parameters for Linear Booster