Extreme compression of sentence-transformer ranker models: faster inference, longer battery life, and less storage on edge devices
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Abstract (arXiv)
Modern search systems use several large ranker models with transformer architectures. These models require large computational resources and are not suitable for usage on devices with limited computational resources. Knowledge distillation is a popular compression technique that can reduce the resource needs of such models, where a large teacher model transfers knowledge to a small student model. To drastically reduce memory requirements and energy consumption, we propose two extensions for a popular sentence-transformer distillation procedure: generation of an optimal size vocabulary and dimensionality reduction of the embedding dimension of teachers prior to distillation. We evaluate these extensions on two different types of ranker models. This results in extremely compressed student models whose analysis on a test dataset shows the significance and utility of our proposed extensions.
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References · 20
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8 more
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- 2024Model Compression and Efficient Inference for Large Language Models: A Survey
- 2023Instruction Distillation Makes Large Language Models Efficient Zero-shot Rankers
- 2025KV-Distill: Nearly Lossless Learnable Context Compression for LLMs
- 2023EmbedDistill: A Geometric Knowledge Distillation for Information Retrieval
- 2026Demystifying Low-Rank Knowledge Distillation in Large Language Models: Convergence, Generalization, and Information-Theoretic Guarantees