Event Argument Extraction (EAE) aims to identify arguments and assign them to predefined roles within a document. Existing methods face challenges in modeling intra-class variance and inter-class ambiguity, hindering accurate role assignment. Inspired by how humans dynamically adjust classification criteria while maintaining category consistency (e.g., distinguishing ''Victim'' and ''Attacker'' roles based on contextual relationships), we propose a HDMAR (Hyperspherical Dynamic Multi-Prototype with Arguments Dependencies and Role Consistency) method, where three innovations tackle these challenges: (1) Hyperspherical dynamic multi-prototype learning is used to capture intra-role diversity and enforce inter-role separation via hyperspherical optimization and optimal transport, (2) cross-event role consistency is used to align role representations across events, and (3) an arguments dependencies-guided encoding module enhances contextual understanding of intra-event and inter-event dependencies. Experiments on RAMS and WikiEvents demonstrate gains in accuracy, with further analysis validating the contributions of each module.

Current research shows that providing instructions to guide Large Language Models (LLMs) improves reasoning tasks, but existing methods struggle to balance accuracy and generalization. Manually crafted instructions tailored to specific LLMs and tasks improve performance but reduce generalizability, while more general instructions lack detail and lower performance. To address this, we propose a dynamic instruction-generation method using an Instruction-Generation Prompt (IGP). IGP categorizes problems into domains and integrates the model's capabilities to generate detailed task-specific instructions, resulting in a comprehensive plan. This approach achieves high precision with general prompts without requiring in-depth knowledge of LLMs or tasks. We validated our method across five LLMs and ten datasets in three task categories. Our dynamically generated instructions outperformed traditionally handcrafted, LLM-specific instructions across various LLMs and tasks.

In this paper, we study multimodal metaphor detection to obtain real semantic meaning from multiple heterogeneous information sources . The existing approaches mainly suffer from two drawbacks. (1) They focus on textual aspects, overlooking the characteristics of visual metaphor information. (2) Efficient methods for fusing multimodal metaphor features are lacking. To address the first issue, we propose a visual information enhancement method based on dual-granularity visual feature fusion , obtaining complete metaphorical visual features. To achieve bidirectional interaction among multimodal metaphor features, we further develop a multi-interactive crossmodal residual network (MCRN) that fuses the consistent and complementary information between different modalities and design a progressive fusion strategy to enhance the iterative fusion ability of the model. We extensively evaluate the proposed method on the popular Met-meme metaphor detection benchmark, outperforming the existing state-of-the-art methods by a large margins; i.e., we achieve F1 score improvements ranging from 1.47% to 2.55% under different languages. In addition, we further extend the evaluation to the Sarcasm dataset to validate the ability of the model to perceive semantic contrasts and meaning transformations, and the experimental results are superior to those of a strong baseline model .

Sentiment and emotion, which correspond to long-term and short-lived human feelings, are closely linked to each other, leading to the fact that sentiment analysis and emotion recognition are also two interdependent tasks in natural language processing (NLP). One task often leverages the shared knowledge from another task and performs better when solved in a joint learning paradigm. Conversational context dependency, multi-modal interaction, and multi-task correlation are three key factors that contribute to this joint paradigm. However, none of the recent approaches have considered them in a unified framework. To fill this gap, we propose a multi-modal, multi-task interactive graph attention network, termed M3GAT, to simultaneously solve the three problems. At the heart of the model is a proposed interactive conversation graph layer containing three core sub-modules, which are: (1) local-global context connection for modeling both local and global conversational context, (2) cross-modal connection for learning multi-modal complementary and (3) cross-task connection for capturing the correlation across two tasks. Comprehensive experiments on three benchmarking datasets, MELD, MEISD, and MSED, show the effectiveness of M3GAT over state-of-the-art baselines with the margin of 1.88%, 5.37%, and 0.19% for sentiment analysis, and 1.99%, 3.65%, and 0.13% for emotion recognition, respectively. In addition, we also show the superiority of multi-task learning over the single-task framework.

Social influence is essential to social recommendation. Current influence-based social recommendation focuses on the explicit influence on observed social links. However, in real cases, implicit social influence can also impact users' preference in an unobserved way. In this work, we concern two kinds of implicit influence: Local Implicit Influence of persons on unobserved interpersonal relations, and Global Implicit Influence of items broadcasted to users. We improve the state-of-the-art GNN-based social recommendation methods by modeling two kinds of implicit influences separately. Local implicit influence is involved by predicting unobserved social relationships. Global implicit influence is involved by defining global popularity of each item and personalize the impact of the popularity on each user. In a GCN network, explicit and implicit influence are integrated to learn the social embedding of users and items in social recommendation. Experimental results on Yelp initially demonstrate the effectiveness of proposed model.

Topic detection in social media is a challenging task due to large-scale short, noisy and informal nature of messages. Most existing methods only consider textual content or simultaneously model the posts and the first-order structural characteristics of social networks. They ignore the impact of larger neighborhoods in microblog conversations on topics. Moreover, the simple combination of separated content and structure representations fails to capture their nonlinear correlation and different importance in topic inference. To this end, we propose a novel random walk based Parallel Social Contexts Fusion Topic Model (PCFTM) for weibo conversations. Firstly, a user-level conversation network with content information is built by the reposting and commenting relationships among users. Through random walks of different lengths on network, we obtain the user sequences containing the parallel content and structure contexts, which are used to acquire the flexible-order proximity of users. Then we propose a self-fusion network embedding to capture the nonlinear correlation between parallel social contexts. It is achieved by taking the content embedding sequence processed by CNN as the initial value of structure embedding sequence fed to Bi-LSTM. Meanwhile, a user-level self-attention is further used to mine the different importance of users to topics. Lastly, the user sequence embedding is incorporated into neural variational inference for detecting topics, which adaptively balances the intrinsic complementarity between content and structure, and fully uses both local and global social contexts in topic inference. Extensive experiments on three real-world weibo datasets demonstrate the effectiveness of our proposed model.