Papers › Multi-Granularity Structural Knowledge Distillation for Language Model Compression

Multi-Granularity Structural Knowledge Distillation for Language Model Compression

1 May 2022ACL 2022 5archive 2025-07-28

Chang Liu, Chongyang Tao, Jiazhan Feng, Dongyan Zhao

Transferring the knowledge to a small model through distillation has raised great interest in recent years. Prevailing methods transfer the knowledge derived from mono-granularity language units (e.g., token-level or sample-level), which is not enough to represent the rich semantics of a text and may lose some vital knowledge. Besides, these methods form the knowledge as individual representations or their simple dependencies, neglecting abundant structural relations among intermediate representations. To overcome the problems, we present a novel knowledge distillation framework that gathers intermediate representations from multiple semantic granularities (e.g., tokens, spans and samples) and forms the knowledge as more sophisticated structural relations specified as the pair-wise interactions and the triplet-wise geometric angles based on multi-granularity representations. Moreover, we propose distilling the well-organized multi-granularity structural knowledge to the student hierarchically across layers. Experimental results on GLUE benchmark demonstrate that our method outperforms advanced distillation methods.

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Knowledge DistillationLanguage ModelingLanguage ModellingModel Compression

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