Data-Free Distillation of Language Model by Text-to-Text Transfer

• URL: http://arxiv.org/abs/2311.01689v1
• Date: Fri, 3 Nov 2023 03:31:47 GMT
• Title: Data-Free Distillation of Language Model by Text-to-Text Transfer
• Authors: Zheyuan Bai, Xinduo Liu, Hailin Hu, Tianyu Guo, Qinghua Zhang, Yunhe Wang
• Abstract summary: Data-Free Knowledge Distillation (DFKD) plays a vital role in compressing the model when original training data is unavailable. We propose a novel DFKD framework, namely DFKD-T$3$, where the pretrained generative language model can also serve as a controllable data generator for model compression. Our method can boost the distillation performance in various downstream tasks such as sentiment analysis, linguistic acceptability, and information extraction.
• Score: 22.830164917398623
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Data-Free Knowledge Distillation (DFKD) plays a vital role in compressing the model when original training data is unavailable. Previous works for DFKD in NLP mainly focus on distilling encoder-only structures like BERT on classification tasks, which overlook the notable progress of generative language modeling. In this work, we propose a novel DFKD framework, namely DFKD-T$^{3}$, where the pretrained generative language model can also serve as a controllable data generator for model compression. This novel framework DFKD-T$^{3}$ leads to an end-to-end learnable text-to-text framework to transform the general domain corpus to compression-friendly task data, targeting to improve both the \textit{specificity} and \textit{diversity}. Extensive experiments show that our method can boost the distillation performance in various downstream tasks such as sentiment analysis, linguistic acceptability, and information extraction. Furthermore, we show that the generated texts can be directly used for distilling other language models and outperform the SOTA methods, making our method more appealing in a general DFKD setting. Our code is available at https://gitee.com/mindspore/models/tree/master/research/nlp/DFKD\_T3.

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