Count number of leaves in the final ensemble

[samanemami]

Summary

During the training, the model builds a decision tree regressor with a different number of leaves.

The question here is that each tree has how many leaves?

Motivation

To compare the lightGBM model size with different models such as XGBoost

We can check the size of the model

Description

The model already has the dump method, is there any feature to return the leaves from the dumped model?

[StrikerRUS]

Hey @samanemami, thanks for using LightGBM!

You can count number of leaves with the help of trees_to_dataframe() method which parses a dumped model for you.
#4944 (comment)

[samanemami]

Thank you @StrikerRUS

[github-actions]

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