Sequential Integrated Gradients: a simple but effective method for explaining language models

• URL: http://arxiv.org/abs/2305.15853v1
• Date: Thu, 25 May 2023 08:44:11 GMT
• Title: Sequential Integrated Gradients: a simple but effective method for explaining language models
• Authors: Joseph Enguehard
• Abstract summary: We propose a new method for explaining language models called Sequential Integrated Gradients ( SIG) SIG computes the importance of each word in a sentence by keeping fixed every other words, only creatings between the baseline and word of interest. We show on various models and datasets that SIG proves to be a very effective method for explaining language models.
• Score: 0.18459705687628122
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Several explanation methods such as Integrated Gradients (IG) can be characterised as path-based methods, as they rely on a straight line between the data and an uninformative baseline. However, when applied to language models, these methods produce a path for each word of a sentence simultaneously, which could lead to creating sentences from interpolated words either having no clear meaning, or having a significantly different meaning compared to the original sentence. In order to keep the meaning of these sentences as close as possible to the original one, we propose Sequential Integrated Gradients (SIG), which computes the importance of each word in a sentence by keeping fixed every other words, only creating interpolations between the baseline and the word of interest. Moreover, inspired by the training procedure of several language models, we also propose to replace the baseline token "pad" with the trained token "mask". While being a simple improvement over the original IG method, we show on various models and datasets that SIG proves to be a very effective method for explaining language models.

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