Clarify descriptions and add links to the tutorial in Python. #2446, #2947

commit_hash:fca2225a08d28012c59f3660b640f6504c653b9f

Author: andrey-khropov

README.md

@@ -54,10 +54,14 @@ It's better to start CatBoost exploring from this basic tutorials.
 * [CatBoost PredictionDiff Feature Importance Tutorial](./prediction_diff_feature_importance_tutorial.ipynb)
  * This tutorials shows how to use PredictionDiff feature importances.
 
-## Custom loss
+## Custom metrics and losses
+
+* [Custom Metrics and Losses in C++ Tutorial](custom_loss/custom_metric_tutorial.md)
+ * This tutorial shows how to add custom per-object metrics and objective functions in C++ native code.
+
+* [Custom Metrics and Losses in Python Tutorial](custom_loss/custom_loss_and_metric_tutorial.ipynb)
+ * This tutorial shows how to add custom per-object metrics and objective functions in Python.
 
-* [Custom Metrics Tutorial](custom_loss/custom_metric_tutorial.md)
- * This tutorial shows how to add custom per-object metrics.
 
 ## Apply model
 

custom_loss/README.md

@@ -1,4 +1,7 @@
-# Custom loss
+# Custom metrics and losses
 
-* [Custom Metrics Tutorial](custom_metric_tutorial.md)
- * This tutorial shows how to add custom per-object metrics.
+* [Custom Metrics and Losses in C++ Tutorial](custom_metric_tutorial.md)
+ * This tutorial shows how to add custom per-object metrics and objective functions in C++ native code.
+
+* [Custom Metrics and Losses in Python Tutorial](custom_loss_and_metric_tutorial.ipynb)
+ * This tutorial shows how to add custom per-object metrics and objective functions in Python.