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Globally Induced Forest: A Prepruning Compression Scheme
Jean-Michel Begon · Arnaud Joly · Pierre Geurts

Tue Aug 08 01:30 AM -- 05:00 AM (PDT) @ Gallery #86

Tree-based ensemble models are heavy memory-wise. An undesired state of affairs considering nowadays datasets, memory-constrained environment and fitting/prediction times. In this paper, we propose the Globally Induced Forest (GIF) to remedy this problem. GIF is a fast prepruning approach to build lightweight ensembles by iteratively deepening the current forest. It mixes local and global optimizations to produce accurate predictions under memory constraints in reasonable time. We show that the proposed method is more than competitive with standard tree-based ensembles under corresponding constraints, and can sometimes even surpass much larger models.

Author Information

Jean-Michel Begon (University of Liege)
Arnaud Joly (University of Liege)
Pierre Geurts (University of Liege)

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