Impact of Intermediate Layer Representations in mBERT on Robustness in Adversarial Zero-Shot Cross-Lingual Transfer

Abstract

Abstract: Multilingual BERT (mBERT), a language model pre-trained on large multilingual corpora, has impressive zero-shot cross-lingual transfer capabilities and performs surprisingly well on zero-shot POS tagging and Named Entity Recognition (NER), as well as on cross-lingual model transfer. At present, the mainstream methods to solve the cross-lingual downstream tasks are always using the last transformer layer's output of mBERT as the representation of linguistic information. In this work, we explore the complementary property of lower layers to the last transformer layer of mBERT. A feature aggregat

Research Question

How does the integration of intermediate layer representations in mBERT affect the robustness of zero-shot cross-lingual transfer in adversarial settings, evaluated using accuracy on PAWS-X with adversarial perturbations?

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