Wisdom of Committee: Distilling from Foundation Model to Specialized Application Model

📄 arXiv: 2402.14035v3 📥 PDF

作者: Zichang Liu, Qingyun Liu, Yuening Li, Liang Liu, Anshumali Shrivastava, Shuchao Bi, Lichan Hong, Ed H. Chi, Zhe Zhao

分类: cs.LG, cs.AI

发布日期: 2024-02-21 (更新: 2024-05-15)


💡 一句话要点

提出教学委员会以解决基础模型与专用模型间的知识转移问题

🎯 匹配领域: 支柱二:RL算法与架构 (RL & Architecture) 支柱九:具身大模型 (Embodied Foundation Models)

关键词: 知识蒸馏 基础模型 专用模型 教学委员会 DiverseDistill 互补教师 模型优化

📋 核心要点

  1. 现有的知识蒸馏方法在基础模型与专用模型之间存在显著的能力差距,导致知识转移面临挑战。
  2. 本文提出通过构建教学委员会,结合基础模型教师与互补教师,来促进知识的有效转移。
  3. 实验结果显示,增加互补教师显著提升了学生模型的性能,DiverseDistill方法在各类基线中表现优异。

📝 摘要(中文)

近年来,基础模型在多种任务上取得了显著的性能提升。与此同时,针对特定应用,研究者们开发了专用应用模型。为了兼顾这两种模型的优势,本文提出了一种知识转移的方法,通过构建一个包含基础模型教师和互补教师的教学委员会,来促进知识的平滑转移。互补教师的模型特性与学生模型相似,旨在缩小基础模型与专用应用模型之间的差距。此外,本文引入了DiverseDistill方法,使学生能够理解每位教师的专长并提取任务知识。实验结果表明,增加互补教师能够提升学生模型的性能,DiverseDistill在各类教师选择下均优于基线蒸馏方法,显著提高了学生模型的表现。

🔬 方法详解

问题定义:本文旨在解决基础模型与专用应用模型之间的知识转移问题。现有的蒸馏方法面临模型架构、输入特征和优化分布等方面的显著差异,导致知识转移效果不佳。

核心思路:论文提出构建一个教学委员会,其中包含基础模型教师和互补教师。互补教师的特性与学生模型相似,旨在缩小基础模型与专用模型之间的差距,从而实现更顺畅的知识转移。

技术框架:整体架构包括基础模型教师、互补教师和学生模型三个主要模块。学生模型通过DiverseDistill方法学习教师的知识,理解各教师的专长,并提取任务相关的知识。

关键创新:最重要的创新在于引入了互补教师和DiverseDistill方法,这与传统的蒸馏方法不同,能够更有效地处理教师模型之间的差异,提升知识转移的效率。

关键设计:在DiverseDistill中,设计了特定的损失函数,使学生能够根据各教师的专长进行知识提取。此外,模型的参数设置和网络结构经过精心设计,以确保最佳的学习效果。

🖼️ 关键图片

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📊 实验亮点

实验结果表明,增加互补教师后,学生模型的性能显著提升,DiverseDistill方法在多种基线蒸馏方法中均表现优异,提升幅度达到X%(具体数据未知),展示了其在知识转移中的有效性。

🎯 应用场景

该研究的潜在应用领域包括自然语言处理、计算机视觉和其他需要高效模型的任务。通过有效的知识转移,专用应用模型能够在特定任务中实现更高的性能和效率,具有重要的实际价值和广泛的应用前景。

📄 摘要(原文)

Recent advancements in foundation models have yielded impressive performance across a wide range of tasks. Meanwhile, for specific applications, practitioners have been developing specialized application models. To enjoy the benefits of both kinds of models, one natural path is to transfer the knowledge in foundation models into specialized application models, which are generally more efficient for serving. Techniques from knowledge distillation may be applied here, where the application model learns to mimic the foundation model. However, specialized application models and foundation models have substantial gaps in capacity, employing distinct architectures, using different input features from different modalities, and being optimized on different distributions. These differences in model characteristics lead to significant challenges for distillation methods. In this work, we propose creating a teaching committee comprising both foundation model teachers and complementary teachers. Complementary teachers possess model characteristics akin to the student's, aiming to bridge the gap between the foundation model and specialized application models for a smoother knowledge transfer. Further, to accommodate the dissimilarity among the teachers in the committee, we introduce DiverseDistill, which allows the student to understand the expertise of each teacher and extract task knowledge. Our evaluations demonstrate that adding complementary teachers enhances student performance. Finally, DiverseDistill consistently outperforms baseline distillation methods, regardless of the teacher choices, resulting in significantly improved student performance.