Challenge: Recent neural language generation systems often hallucinate contents when trained on loosely corresponding pairs of the input structure and text.
Approach: They propose to integrate a language understanding module for data refinement with self-training iterations to induce strong equivalence between the input data and the paired text.
Outcome: Experiments on the E2E challenge dataset show that the proposed framework reduces relative unaligned noise by 50% compared with the current state-of-the-art ensemble generator.

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Controlled Hallucinations: Learning to Generate Faithfully from Noisy Data (2020.findings-emnlp)

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Challenge: Neural text generation (data- or text-to-text) demonstrates remarkable performance when training data is abundant which for many applications is not the case.
Approach: They propose a technique to treat hallucinations as a controllable aspect of the generated text without dismissing any input and without modifying the model architecture.
Outcome: The proposed technique can be used on a WikiBio dataset and in a human evaluation.
Detecting Hallucinated Content in Conditional Neural Sequence Generation (2021.findings-acl)

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Challenge: Neural sequence models can generate fluent sentences, but they can also hallucinate additional content not supported by the input.
Approach: They propose a task to predict whether each token in the output sequence is hallucinated and collect manually annotated evaluation sets for this task.
Outcome: The proposed method outperforms baseline methods on machine translation and abstractive summarization datasets and achieves significant improvements in both supervised and unsupervised settings.
Critic-Driven Decoding for Mitigating Hallucinations in Data-to-text Generation (2023.emnlp-main)

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Challenge: Hallucination of text lacking grounding in input data is a problem in neural data-to-text generation.
Approach: They propose to combine probabilistic output of a generator language model with the output of an “text critic” classifier which guides the generation by assessing the match between the input data and the generated text.
Outcome: The proposed method improves on the WebNLG and OpenDialKG benchmarks.
LLM Agents Implement an NLG System from Scratch: Building Interpretable Rule-Based RDF-to-Text Generators (2025.emnlp-industry)

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Challenge: Existing neural approaches to generate RDF-to-text are limited in their implementation.
Approach: They propose a framework where the model is “trained” through collaborative interactions among multiple LLM agents rather than traditional backpropagation.
Outcome: The proposed framework reduces hallucinations and fluency penalties on the WebNLG and OpenDialKG datasets.
Embedding and Gradient Say Wrong: A White-Box Method for Hallucination Detection (2024.emnlp-main)

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Challenge: Existing methods for hallucination detection have attracted more attention from the community.
Approach: They propose to model the distributional distance between the regular conditional output and the unconditional output, which is generated without a given input text.
Outcome: The proposed model achieves state-of-the-art on the hallucination benchmarks HADES and other datasets.
Elastic Weight Removal for Faithful and Abstractive Dialogue Generation (2024.naacl-long)

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Challenge: Current-day large language models generate coherent, grammatical, and seemingly meaningful text, but are prone to hallucinating incorrect information.
Approach: They propose to ‘subtract’ parameters of a model trained to hallucinate from a dialogue response generation model to ‘negate’ the contribution of such hallucinatedexamples from it.
Outcome: The proposed method reduces hallucinations and discourages extractive responses, which are often a consequence of reducing hallucines by encouraging copy-pasting of document spans.
HALoGEN: Fantastic LLM Hallucinations and Where to Find Them (2025.acl-long)

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Challenge: generative large language models produce hallucinations that are not aligned with world knowledge or input context.
Approach: They propose a hallucination benchmark framework that measures hallucinism in large language models . they evaluate 150,000 generations from 14 language models and find they are riddled with hallucinos .
Outcome: The proposed framework evaluates 150,000 generations from 14 language models.
Alleviating Hallucinations of Large Language Models through Induced Hallucinations (2025.findings-naacl)

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Challenge: Existing studies have shown that large language models generate inaccurate or fabricated information, a phenomenon known as hallucinations.
Approach: They propose a simple strategy to induce-then-contrast decode LLMs to enhance their factuality . they first induce hallucinations from the original model and penalize them .
Outcome: The proposed strategy improves factuality of large language models across task formats, model sizes, and model families.
Neural Path Hunter: Reducing Hallucination in Dialogue Systems via Path Grounding (2021.emnlp-main)

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Challenge: Dialogue systems that generate factually incorrect responses are often unfitful and hallucinate factuality invalid.
Approach: They propose a method to improve faithfulness and reduce hallucination of neural dialogue systems to known facts supplied by a Knowledge Graph.
Outcome: The proposed approach improves faithfulness and reduces hallucination of dialogue systems to known facts . it leverages a token-level fact critic to identify plausible sources of hallucinism .
HALLUCANA: Fixing LLM Hallucination with A Canary Lookahead (2025.findings-naacl)

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Challenge: Existing methods to detect factual hallucinations w.r.t. world knowledge require assistive generations (samples, drafts, etc.) Existing approaches to factuality hallucinism detection, such as SelfCheckGPT, require assistively generation (sequences, Drafts, and etc.). Existing studies on factualism hallucinosation detection require assistives generations (Sample, draft, etc).
Approach: They propose a canary lookahead which detects and corrects factual hallucinations of Large Language Models in long-form generation by exploiting the internal factuality representation in the LLM hidden space.
Outcome: The proposed method improves generation quality by 2.5x while consuming over 6 times less compute.

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