[docs] update description of deterministic parameter (#4027)

* update description of deterministic parameter to require using with force_row_wise or force_col_wise

* Update include/LightGBM/config.h

Co-authored-by: Nikita Titov <[email protected]>

* update docs

Co-authored-by: Nikita Titov <[email protected]>

docs/Parameters.rst

@@ -229,6 +229,8 @@ Core Parameters
 
    -  **Note**: setting this to ``true`` may slow down the training
 
+   -  **Note**: to avoid potential instability due to numerical issues, please set ``force_col_wise=true`` or ``force_row_wise=true`` when setting ``deterministic=true``
+
 Learning Control Parameters
 ---------------------------
 

include/LightGBM/config.h

@@ -236,6 +236,7 @@ struct Config {
   // desc = when you use the different seeds, different LightGBM versions, the binaries compiled by different compilers, or in different systems, the results are expected to be different
   // desc = you can `raise issues <https://github.com/microsoft/LightGBM/issues>`__ in LightGBM GitHub repo when you meet the unstable results
   // desc = **Note**: setting this to ``true`` may slow down the training
+  // desc = **Note**: to avoid potential instability due to numerical issues, please set ``force_col_wise=true`` or ``force_row_wise=true`` when setting ``deterministic=true``
   bool deterministic = false;
 
   #pragma endregion