Challenge: Existing task weighting methods assign weights only based on training losses, while ignoring the gap between the training loss and generalization loss.
Approach: They propose a task weighting algorithm which automatically weights the tasks via a learning-to-learn paradigm and a multi-task text classification paradigm.
Outcome: Extensive experiments show that the proposed method outperforms existing methods in multi-task text classification.

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Multi-Task Learning for Argumentation Mining in Low-Resource Settings (N18-2)

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Challenge: Argument component identification is difficult for trained annotators to perform in a new domain or to develop new AM tasks.
Approach: They investigate whether multi-task learning can improve performance on AM problems . they found that MTL performs particularly well when little training data is available for the main task .
Outcome: The proposed approach performs better when little training data is available for the main task, a common scenario in AM.
A Survey of Multi-task Learning in Natural Language Processing: Regarding Task Relatedness and Training Methods (2023.eacl-main)

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Challenge: Multi-task learning is a popular approach in natural language processing because of its commonalities and differences.
Approach: They propose to summarize recent advances in multi-task learning methods based on their task relatedness into two general multi-step training methods.
Outcome: The proposed methods summarize the tasks and discuss future directions.
Low-Rank Updates of pre-trained Weights for Multi-Task Learning (2023.findings-acl)

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Challenge: Multi-task learning is a popular approach for learning with pre-trained models due to the complexity of the tasks and the challenges associated with fine-tuning large pre-train models.
Approach: They propose a new approach for Multi-task learning which is based on stacking the weights of Neural Networks as a tensor.
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Multi-Task Learning for Sequence Tagging: An Empirical Study (C18-1)

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Challenge: Existing work on "pairwise" MTL has been validated in sequence tagging but key issues remain about its effectiveness.
Approach: They propose three general multi-task learning approaches on 11 sequence tagging tasks.
Outcome: The proposed approaches improve on 11 sequence tagging tasks.
BanditMTL: Bandit-based Multi-task Learning for Text Classification (2021.acl-long)

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Challenge: Existing methods to regularize task variance are unexplored in multi-task text classification.
Approach: They propose a multi-task learning method based on adversarial multi-armed bandit to regularize the task variance by means of a mirror gradient ascent-descent algorithm.
Outcome: The proposed method achieves state-of-the-art in multi-task text classification.
Tchebycheff Procedure for Multi-task Text Classification (2020.acl-main)

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Challenge: Existing methods for text classification assume that multitask text classification problems are convex multiobjective optimization problems.
Approach: They propose a Tchebycheff procedure to optimize multi-task classification problems without convex assumption.
Outcome: The proposed method is able to find an arbitrary Pareto optimal solution in the PareTO set if the problem is convex, but excludes many Paret optimal solutions from its search scope.
Improving Gradient Trade-offs between Tasks in Multi-task Text Classification (2023.acl-long)

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Challenge: Existing methods to mitigate task conflict problem are heuristics or gradient-based algorithms to achieve an arbitrary Pareto optimal trade-off among different tasks .
Approach: They propose a gradient trade-off approach to mitigate the task conflict problem by using heuristics or gradient-based algorithms to achieve an arbitrary Pareto optimal trade- off among different tasks.
Outcome: The proposed model can achieve an arbitrary Pareto optimal trade-off among different tasks near the main objective of multi-task text classification (MTC) it is found that training all tasks simultaneously yields degraded performance than learning them independently, leading to poor training.
Diverse Distributions of Self-Supervised Tasks for Meta-Learning in NLP (2021.emnlp-main)

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Challenge: Meta-learning considers learning as an efficient learning process that can leverage its past experience to accurately solve new tasks.
Approach: They propose to provide task distributions for meta-learning by considering self-supervised tasks automatically proposed from unlabeled text to enable large-scale meta- learning in NLP.
Outcome: The proposed distributions show that human learning models perform better on the few-shot benchmark than previous methods.
Bag-of-Words Transfer: Non-Contextual Techniques for Multi-Task Learning (D19-61)

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Challenge: Existing approaches to multi-task learning take advantage of transfer among tasks . generative reconstruction of the observations is not included in the standard framework .
Approach: They propose to use a syntactically-oblivious pooling encoder and pre-trained word embeddings to improve sentence-level representations.
Outcome: The proposed techniques yield similar performance on a universe of task combinations while reducing training time and model size.
Exploring the Role of Task Transferability in Large-Scale Multi-Task Learning (2022.naacl-main)

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Challenge: Recent work has found that multi-task training with a large number of diverse tasks can uniformly improve downstream performance on unseen target tasks.
Approach: They aim to disentangle the effect of scale and relatedness of tasks in multi-task representation learning by increasing the number of tasks and incorporating smaller sets of related tasks.
Outcome: The proposed model improves on unseen target tasks by increasing the scale of multi-task learning to incorporate more tasks and developing similarity metrics to incorporate tasks related to the target task.

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