Improving Causal Interventions in Amnesic Probing with Mean Projection or LEACE

Alicja Dobrzeniecka, Antske Fokkens, Pia Sommerauer


Abstract
Amnesic probing is a technique used to examine the influence of specific linguistic information on the behaviour of a model. This involves identifying and removing the relevant information and then assessing whether the model’s performance on the main task changes. If the removed information is relevant, the model’s performance should decline. The difficulty with this approach lies in removing only the target information while leaving other information unchanged. It has been shown that Iterative Nullspace Projection (INLP), a widely used removal technique, introduces random modifications to representations when eliminating target information. We demonstrate that Mean Projection (MP) and LEACE, two proposed alternatives, remove information in a more targeted manner, thereby enhancing the potential for obtaining behavioural explanations through Amnesic Probing.
Anthology ID:
2025.findings-acl.674
Volume:
Findings of the Association for Computational Linguistics: ACL 2025
Month:
July
Year:
2025
Address:
Vienna, Austria
Editors:
Wanxiang Che, Joyce Nabende, Ekaterina Shutova, Mohammad Taher Pilehvar
Venues:
Findings | WS
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Publisher:
Association for Computational Linguistics
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Pages:
12981–12993
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URL:
https://preview.aclanthology.org/acl25-workshop-ingestion/2025.findings-acl.674/
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Cite (ACL):
Alicja Dobrzeniecka, Antske Fokkens, and Pia Sommerauer. 2025. Improving Causal Interventions in Amnesic Probing with Mean Projection or LEACE. In Findings of the Association for Computational Linguistics: ACL 2025, pages 12981–12993, Vienna, Austria. Association for Computational Linguistics.
Cite (Informal):
Improving Causal Interventions in Amnesic Probing with Mean Projection or LEACE (Dobrzeniecka et al., Findings 2025)
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https://preview.aclanthology.org/acl25-workshop-ingestion/2025.findings-acl.674.pdf