Challenge: Recent studies often formulate IE tasks as a triplet extraction problem, but this paradigm does not support multi-span and n-ary extraction, leading to weak versatility.
Approach: They propose a multi-span cyclic graph extraction problem and a non-autoregressive graph decoding algorithm to extract all spans in a single step.
Outcome: The proposed model outperforms or reaches competitive performance with SOTA systems under few-shot and zero-shot settings and it is compatible with 57 datasets.

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Challenge: Information extraction (IE) tasks have a variety of schemas and objectives that differ across tasks.
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UniEX: An Effective and Efficient Framework for Unified Information Extraction via a Span-extractive Perspective (2023.acl-long)

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Challenge: Existing approaches for information extraction (IE) are limited by the number of subtasks and the isolation of the subtask.
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A general framework for information extraction using dynamic span graphs (N19-1)

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Challenge: Existing frameworks for information extraction use a pipeline approach to identify entities and then use the detected entity spans for relation extraction and coreference resolution.
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Universal Information Extraction with Meta-Pretrained Self-Retrieval (2023.findings-acl)

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Challenge: Existing methods for IE are task-specific, resulting in specialized and isolated approaches for different tasks.
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Challenge: Existing solutions for information extraction (IE) require specialized models for different tasks or require expensive large language models.
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FSUIE: A Novel Fuzzy Span Mechanism for Universal Information Extraction (2023.acl-long)

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Challenge: Existing Universal Information Extraction models rely heavily on span boundaries in data during training, which does not reflect the reality of span annotation challenges.
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Entity, Relation, and Event Extraction with Contextualized Span Representations (D19-1)

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Challenge: Existing frameworks for named entity recognition, relation extraction, and event extraction can be easily adapted for new tasks or datasets.
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UTC-IE: A Unified Token-pair Classification Architecture for Information Extraction (2023.acl-long)

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Challenge: Information Extraction (IE) tasks have been solved with different models because of their output structures.
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ADAPTIVE IE: Investigating the Complementarity of Human-AI Collaboration to Adaptively Extract Information on-the-fly (2025.coling-main)

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Challenge: Existing IE systems are either fully supervised, requiring expensive human annotations, or fully unsupervised, extracting information that often do not cater to user’s needs.
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Easy-to-Hard Learning for Information Extraction (2023.findings-acl)

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Challenge: Existing models for information extraction (IE) use a one-stage learning strategy to extract the target structure from unstructured text data.
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