Measuring Density and Similarity of Task Relevant Information in Neural Representations
Authors: Danish Pruthi, Mansi Gupta, Nitish Kumar Kulkarni, Graham Neubig, Eduard Hovy
Keywords: Neural Networks, Representation, Information density, Transfer Learning
TL;DR: Measuring information density and cross-task similarity in neural models and its application in transfer learning.
Abstract: Neural models achieve state-of-the-art performance due to their ability to extract salient features useful to downstream tasks. However, our understanding of how this task-relevant information is included in these networks is still incomplete. In this paper, we examine two questions (1) how densely is information included in extracted representations, and (2) how similar is the encoding of relevant information between related tasks. We propose metrics to measure information density and cross-task similarity, and perform an extensive analysis in the domain of natural language processing, using four varieties of sentence representation and 13 tasks. We also demonstrate how the proposed analysis tools can find immediate use in choosing tasks for transfer learning.