Semantic Skill Grounding for Embodied Instruction-Following in Cross-Domain Environments

Sangwoo Shin, SeungHyun Kim, Youngsoo Jang, Moontae Lee, Honguk Woo


Abstract
In embodied instruction-following (EIF), the integration of pretrained language models (LMs) as task planners emerges as a significant branch, where tasks are planned at the skill level by prompting LMs with pretrained skills and user instructions. However, grounding these pretrained skills in different domains remains challenging due to their intricate entanglement with the domain-specific knowledge. To address this challenge, we present a semantic skill grounding (SemGro) framework that leverages the hierarchical nature of semantic skills. SemGro recognizes the broad spectrum of these skills, ranging from short-horizon low-semantic skills that are universally applicable across domains to long-horizon rich-semantic skills that are highly specialized and tailored for particular domains. The framework employs an iterative skill decomposition approach, starting from the higher levels of semantic skill hierarchy and then moving downwards, so as to ground each planned skill to an executable level within the target domain. To do so, we use the reasoning capabilities of LMs for composing and decomposing semantic skills, as well as their multi-modal extension for assessing the skill feasibility in the target domain. Our experiments in the VirtualHome benchmark show the efficacy of SemGro in 300 cross-domain EIF scenarios.
Anthology ID:
2024.findings-acl.200
Volume:
Findings of the Association for Computational Linguistics ACL 2024
Month:
August
Year:
2024
Address:
Bangkok, Thailand and virtual meeting
Editors:
Lun-Wei Ku, Andre Martins, Vivek Srikumar
Venue:
Findings
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
3354–3376
Language:
URL:
https://aclanthology.org/2024.findings-acl.200
DOI:
Bibkey:
Cite (ACL):
Sangwoo Shin, SeungHyun Kim, Youngsoo Jang, Moontae Lee, and Honguk Woo. 2024. Semantic Skill Grounding for Embodied Instruction-Following in Cross-Domain Environments. In Findings of the Association for Computational Linguistics ACL 2024, pages 3354–3376, Bangkok, Thailand and virtual meeting. Association for Computational Linguistics.
Cite (Informal):
Semantic Skill Grounding for Embodied Instruction-Following in Cross-Domain Environments (Shin et al., Findings 2024)
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PDF:
https://aclanthology.org/2024.findings-acl.200.pdf