Mechanisms for encoding positional information are central for transformer-based language models. In this paper, we analyze the position embeddings of existing language models, finding strong evidence of translation invariance, both for the embeddings themselves and for their effect on self-attention. The degree of translation invariance increases during training and correlates positively with model performance. Our findings lead us to propose translation-invariant self-attention (TISA), which accounts for the relative position between tokens in an interpretable fashion without needing conventional position embeddings. Our proposal has several theoretical advantages over existing position-representation approaches. Proof-of-concept experiments show that it improves on regular ALBERT on GLUE tasks, while only adding orders of magnitude less positional parameters.

The Case for Translation-Invariant Self-Attention in Transformer-Based Language Models

**Session Chair: ** Sebastian Gehrmann 
**Session Volunteer: ** Shailza Jolly

3E: Interpretability and Analysis of Models for NLP #2

technical paper

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The Case for Translation-Invariant Self-Attention in Transformer-Based Language Models

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