[doc] Fix custom_metric_obj.rst [skip ci] (#10796) (#10815)

Added the square to the derivative in the hessian Co-authored-by: Corentin Santos <corentin.santos@iphc.cnrs.fr>
2024-09-10 05:11:43 +08:00 · 2024-09-10 05:11:43 +08:00 · 3ef8383d93
commit 3ef8383d93
parent bba6aa74fb
1 changed files with 1 additions and 1 deletions
--- a/doc/tutorials/custom_metric_obj.rst
+++ b/doc/tutorials/custom_metric_obj.rst
@ -52,7 +52,7 @@ If we compute the gradient of said objective function:
 As well as the hessian (the second derivative of the objective):

 .. math::
-   h = \frac{\partial^2{objective}}{\partial{pred}} = \frac{ - \log(pred + 1) + \log(label + 1) + 1}{(pred + 1)^2}
+   h = \frac{\partial^2{objective}}{\partial{pred}^2} = \frac{ - \log(pred + 1) + \log(label + 1) + 1}{(pred + 1)^2}

 *****************************
 Customized Objective Function