Challenge: Existing evaluation protocols for large language models (LLMs) are inadequate for conversational recommender systems.
Approach: They propose an evaluation approach based on LLMs that harnesses LLM-based user simulators to evaluate ChatGPT's performance.
Outcome: The proposed evaluation approach can simulate various system-user interaction scenarios.

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A Systematic Study and Comprehensive Evaluation of ChatGPT on Benchmark Datasets (2023.findings-acl)

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Challenge: Currently, the evaluation of large language models (LLMs) such as ChatGPT in academic datasets is difficult due to the difficulty of evaluating the generative outputs produced by this model against the ground truth.
Approach: They evaluate ChatGPT across 140 tasks and analyze 255K responses it generates in academic datasets.
Outcome: The proposed model performs well on 140 tasks and generates 255K responses in these datasets.
LLM-REDIAL: A Large-Scale Dataset for Conversational Recommender Systems Created from User Behaviors with LLMs (2024.findings-acl)

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Challenge: Existing CRS datasets suffer from data inextensibility and semantic inconsistency .
Approach: They introduce the LLM-REDIAL dataset to facilitate the research in CRS by leveraging large language models to generate high-quality dialogues.
Outcome: The proposed dataset is the largest multi-domain CRS dataset which consists of 47.6k multi-turn dialogues with 482.6k utterances across 4 domains.
ChatGPT Beyond English: Towards a Comprehensive Evaluation of Large Language Models in Multilingual Learning (2023.findings-emnlp)

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Challenge: Recent advances in natural language processing (NLP) have led to significant breakthroughs in the field.
Approach: They evaluate ChatGPT over multiple tasks with diverse languages and large datasets to provide more comprehensive information for multilingual NLP applications.
Outcome: The proposed model can process and generate texts for multiple languages due to its multilingual training data.
Large Language Models are Not Yet Human-Level Evaluators for Abstractive Summarization (2023.findings-emnlp)

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Challenge: ChatGPT and GPT-4 are popular as evaluation metric for complex generative tasks . however, they are not ready as human replacements due to significant limitations .
Approach: They conduct extensive analysis to examine the stability and reliability of LLMs as automatic evaluators for abstractive summarization.
Outcome: The proposed methods outperform the commonly used automatic metrics but are not ready for human evaluation due to significant limitations.
Refining Text Generation for Realistic Conversational Recommendation via Direct Preference Optimization (2025.emnlp-main)

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Challenge: Existing Conversational Recommender Systems (CRSs) deviate from real human interactions by rapidly recommending items in brief sessions.
Approach: They propose to use Large Language Models to generate dialogue summaries from dialogue history and item recommendation information from item description to extract both explicit user statements and implicit preferences inferred from the dialogue context.
Outcome: The proposed method extracts both explicit user statements and implicit preferences inferred from the dialogue context.
RecInDial: A Unified Framework for Conversational Recommendation with Pretrained Language Models (2022.aacl-main)

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Challenge: Existing generative methods to recommend items are shallowly integrated into the model training and have poor chit-chat ability.
Approach: They propose a framework that integrates recommendation into the dialog generation by introducing a vocabulary pointer.
Outcome: The proposed framework outperforms the state-of-the-art models on a benchmark dataset.
Evaluating Large Language Models as Generative User Simulators for Conversational Recommendation (2024.naacl-long)

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Challenge: Large language models show promise in simulating human-like behavior, raising the question of their ability to represent a diverse population of users.
Approach: They propose a protocol to evaluate the degree to which language models can accurately emulate human behavior in conversational recommendation systems.
Outcome: The proposed protocol evaluates five tasks to reveal deviations of language models from human behavior and offers insights on how to reduce deviations with model selection and prompting strategies.
A Survey on LLM-powered Agents for Recommender Systems (2025.findings-emnlp)

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Challenge: Large Language Models have demonstrated remarkable capabilities in natural language understanding, reasoning, and generation.
Approach: They present a comprehensive synthesis of large language models and their applications . they dissect a four-module agent architecture and review representative designs .
Outcome: The proposed models address fundamental challenges in traditional recommender systems . they include limited comprehension of complex user intents, insufficient interaction capabilities .
Towards Interpretable Mental Health Analysis with Large Language Models (2023.emnlp-main)

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Challenge: Existing studies on large language models lack adequate evaluations and prompting strategies for explainability.
Approach: They evaluate the mental health analysis and emotional reasoning ability of large language models (LLMs) using 11 datasets across 5 tasks.
Outcome: The proposed model shows strong in-context learning ability but still has a significant gap with advanced task-specific methods.
Leveraging Large Language Models for NLG Evaluation: Advances and Challenges (2024.emnlp-main)

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Challenge: introducing Large Language Models (LLMs) has opened new avenues for assessing generated content quality, e.g., coherence, creativity, and context relevance.
Approach: They propose a taxonomy for organizing existing LLM-based evaluation metrics and a structured framework to understand and compare them.
Outcome: The proposed taxonomy offers a framework to understand and compare LLM-based evaluation methods.

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