Challenge: Existing methods for learning affective events that trigger positive or negative sentiment are difficult because of the unbounded combinatorial nature of language.
Approach: They propose to propagate affective polarity using discourse relations using a small seed lexicon and large raw corpus.
Outcome: The proposed method learns affective events effectively without manually labeled data, and improves supervised learning when labeles are small.

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Challenge: Prior work on recognizing affective events focused on producing lexical resources of verbs or event phrases with corresponding affective polarity values.
Approach: They propose a BERT-based model for affective event classification and a discourse-enhanced self-training method that iteratively improves the classifier with unlabeled data.
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Human Needs Categorization of Affective Events Using Labeled and Unlabeled Data (N18-1)

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Challenge: Recent research has focused on identifying affective events in text, which are activities or states that positively or negatively affect the people who experience them.
Approach: They propose to categorize affective events based upon human need categories that often explain people’s motivations and desires: PHYSIOLOGICAL, HEALTH, LEISURE, SOCIAL, FINANCIAL, COGNITION, and FREEDOM.
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Enhancing a Lexicon of Polarity Shifters through the Supervised Classification of Shifting Directions (2020.lrec-1)

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Challenge: Existing polarity shifter lexica only specify when a word can cause shifting, but do not specify when this is limited to a single shifting direction.
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Eliciting Affective Events from Language Models by Multiple View Co-prompting (2023.findings-acl)

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Challenge: Existing methods to generate training data using weakly labeled data are costly and limited .
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Weakly-Supervised Modeling of Contextualized Event Embedding for Discourse Relations (2020.findings-emnlp)

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Challenge: Structured knowledge representations capture temporal relations between events to describe human-level representations of common scenarios.
Approach: They propose to represent narrative graphs and learn contextualized event representations over them using a relational graph neural network model.
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A Regularization Approach for Incorporating Event Knowledge and Coreference Relations into Neural Discourse Parsing (D19-1)

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Challenge: Existing approaches to discourse parsing use commonsense knowledge and linguistic constraints to integrate them into neural network models.
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Contextualized and Generalized Sentence Representations by Contrastive Self-Supervised Learning: A Case Study on Discourse Relation Analysis (2021.naacl-main)

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Challenge: Existing methods to learn contextualized and generalized sentence representations are limited by the size of manually annotated data.
Approach: They propose a method to learn contextualized and generalized sentence representations using contrastive self-supervised learning.
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Towards Label-Agnostic Emotion Embeddings (2021.emnlp-main)

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Challenge: Existing representation schemes for emotion analysis are based on label formats, natural languages, and even disparate model architectures.
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A Comprehensive Analysis of Preprocessing for Word Representation Learning in Affective Tasks (2020.acl-main)

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Challenge: Affective tasks such as sentiment analysis, emotion classification and sarcasm detection have enjoyed great popularity in recent years.
Approach: They conduct a comprehensive analysis of the role of preprocessing techniques in affective analysis based on word vector models.
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Domain-Specific Sentiment Lexicons Induced from Labeled Documents (2020.coling-main)

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Challenge: Existing sentiment lexicons reflect abstract notion of polarity and do not do justice to substantial differences of word polarities between domains.
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