Challenge: Typical approaches do not exploit the potential of historical reviews or do not make full use of user/product associations.
Approach: They propose to use historical reviews to initialize user and product representations and incorporate textual associations via a user-product cross-context module.
Outcome: The proposed method outperforms existing state-of-the-art models on IMDb, Yelp and Longformer benchmarks.

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Challenge: Existing work that improves document-level sentiment analysis by encoding user and product information has been limited to considering only the text of the current review.
Approach: They propose to incorporate all available historical review text belonging to the author of the review in question and investigate the inclusion of his- torical reviews associated with the current product.
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UserIdentifier: Implicit User Representations for Simple and Effective Personalized Sentiment Analysis (2022.naacl-main)

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Challenge: Currently, global models are not able to produce personalized responses for individual users, based on their data.
Approach: They propose a scheme for training a single shared model for all users by prepending a fixed, user-specific non-trainable string to each user’s input text.
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Cold-Start Aware User and Product Attention for Sentiment Classification (P18-1)

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Challenge: Existing models do not deal with cold-start problem typical in review websites.
Approach: They propose a Hybrid Contextualized Sentiment Classifier that uses word encoder and Cold-Start Aware Attention to pool word vectors.
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Rethinking Attribute Representation and Injection for Sentiment Classification (D19-1)

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Challenge: Existing models that use text attributes to improve sentiment classification use text as a categorical feature.
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Outcome: The proposed method outperforms the state-of-the-art and outperformed previous models.
Aligning Language Models to User Opinions (2023.findings-emnlp)

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Challenge: Personality is a defining feature of human beings, shaped by a complex interplay of demographic characteristics, moral principles, and social experiences.
Approach: They use public opinion surveys to model past user opinions in addition to user demographics and ideology to achieve up to 7 points accuracy gains in predicting public opinions from survey questions.
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Context-Aware Sentiment Forecasting via LLM-based Multi-Perspective Role-Playing Agents (2025.acl-long)

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Challenge: Existing methods to predict sentiments on social media are limited and do not consider reciprocal influences among social media users.
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Paraphrase Makes Perfect: Leveraging Expression Paraphrase to Improve Implicit Sentiment Learning (2025.coling-main)

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Challenge: Existing implicit sentiment learning methods focus on capturing implicit sentiment knowledge individually, without considering the potential connection between implicit and explicit sentiment.
Approach: They propose an expression paraphrase strategy and a sentiment-consistent contrastive learning mechanism to learn the connections between implicit and explicit sentiment expressions and integrate them into the model.
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Bridging Cognition and Affect: Emotion-Aware Opinion Summarization using LLMs (2026.findings-acl)

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Challenge: Emotion-aware Opinion Summarization (EAOS) is a framework that captures emotions that shape purchasing decisions.
Approach: They propose a framework that integrates emotion into opinion summaries and a large-scale training dataset and an evaluation benchmark to support this task.
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From Annotation to Adaptation: Metrics, Synthetic Data, and Aspect Extraction for Aspect-Based Sentiment Analysis with Large Language Models (2025.naacl-srw)

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Challenge: Using a synthetic sports feedback dataset, we evaluate open-weight LLMs’ ability to extract aspect-polarity pairs.
Approach: They propose a metric to facilitate the evaluation of aspect extraction with generative models.
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Sentiment Analysis using the Relationship between Users and Products (2023.findings-acl)

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Challenge: Existing studies focus on modelling user and product aspects without considering the relationship between users and products.
Approach: They propose a model that incorporates the relationship between users and products into the model.
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