Challenge: Existing methods for continual prompt tuning are limited by the ever-growing parameter scale of modern language models (e.g., GPT-4 that may have 1.76 trillion parameters).
Approach: They propose a method for continual prompt tuning that enables the lifelong learning of a pre-trained language model by adding a task-specific prompt to a queue of older tasks.
Outcome: The proposed method outperforms the state-of-the-art methods substantially on continual prompt tuning benchmarks.

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Prompts Can Play Lottery Tickets Well: Achieving Lifelong Information Extraction via Lottery Prompt Tuning (2023.acl-long)

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Challenge: Existing research on information extraction tasks focuses on one specific task, but in real-world scenarios, new data of different IE tasks and domains come in a stream over time.
Approach: They propose a parameter- and deployment-efficient prompt tuning method to evaluate the UIE system under a “lifelong learning” setting.
Outcome: The proposed method is able to learn new tasks without forgetting old ones and expand knowledge and functionalities without retraining the whole system.
Continual Prompt Tuning for Dialog State Tracking (2022.acl-long)

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Challenge: Existing methods to train a model on a sequence of tasks are not efficient enough to mitigate catastrophic forgetting.
Approach: They propose a parameter-efficient framework that prevents forgetting and enables knowledge transfer between tasks by learning and freezing a pre-trained model.
Outcome: The proposed framework avoids forgetting and enables knowledge transfer between tasks.
Parameter Efficient Multi-task Fine-tuning by Learning to Transfer Token-wise Prompts (2023.findings-emnlp)

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Challenge: Prompt tuning has been proven to be successful on various tasks by incorporating a small number of trainable parameters while freezing large pre-trained language models.
Approach: They propose a token-wise prompt tuning method that uses a bank of finer-grained soft prompt tokens to generate an instance-dependent prompt.
Outcome: The proposed method performs far better than full parameter fine-tuned models and achieves state-of-the-art by tuning only 0.035% parameters on 14 datasets.
Federated Learning of Large Language Models with Parameter-Efficient Prompt Tuning and Adaptive Optimization (2023.emnlp-main)

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Challenge: Prompt tuning of Large Language Models (LLMs) can incur performance degradation or low training efficiency.
Approach: They propose a prompt tuning approach with Adaptive Optimization to enable efficient FL of LLMs.
Outcome: The proposed approach improves performance and efficiency simultaneously and addresses client drift problems on both the device and server sides.
Towards Anytime Fine-tuning: Continually Pre-trained Language Models with Hypernetwork Prompts (2023.findings-emnlp)

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Challenge: Continual pre-training has been used for a multitude of domains and tasks . a continually pre-trained model can show a non-decreasing performance on unseen domains .
Approach: They propose a method that generates domain-specific prompts by agreement and disagreement losses.
Outcome: The proposed method achieves improvements of 3.57% and 3.4% on two real-world datasets.
PPT: Pre-trained Prompt Tuning for Few-shot Learning (2022.acl-long)

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Challenge: Prompt tuning for pre-trained language models has shown remarkable performance . however, prompt tuning is still not fully explored .
Approach: They propose to pre-train prompts by adding soft prompts into the pre-training stage to obtain a better initialization.
Outcome: The proposed framework outperforms full-model tuning under full-data and few-shot learning settings.
PrAd: Prompt Adaptive Tuning for Decoder-only Language Models (2025.findings-emnlp)

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Challenge: Prompt-based methods suffer from increased input lengths and sensitivity to weight initialization . adapter-based approaches can substantially increase inference time .
Approach: a new paradigm for prompt-based tuning addresses the problem of fine tuning pretrained models . prompt--based methods suffer from increased input lengths and sensitivity to weight initialization . a prompt-oriented approach employs adapters for flexible input transformation .
Outcome: a proposed framework can achieve comparable or better performance and higher inference efficiency even in multi-task scenarios.
The Power of Scale for Parameter-Efficient Prompt Tuning (2021.emnlp-main)

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Challenge: Unlike discrete text prompts used by GPT-3, soft prompts are learned through backpropagation and can be tuned to incorporate signals from any number of labeled examples.
Approach: They propose a mechanism for learning "soft prompts" to condition frozen language models to perform specific downstream tasks.
Outcome: The proposed method outperforms fewshot learning using GPT-3 and matches the quality of model tuning as models exceed billions of parameters.
Bayesian Multi-Task Transfer Learning for Soft Prompt Tuning (2023.findings-emnlp)

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Challenge: Large-scale pre-trained language models have been fine-tuned for various NLP tasks . prompt tuning is a method that optimizes the output of the model to adapt to downstream tasks based on the posterior distribution of the source task.
Approach: They propose a Bayesian approach to prompt tuning that optimizes for adapting pre-trained language models to downstream tasks rather than fine-tuning full model parameters.
Outcome: The proposed approach outperforms the state-of-the-art methods on benchmark NLP tasks.
P-Tuning: Prompt Tuning Can Be Comparable to Fine-tuning Across Scales and Tasks (2022.acl-short)

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Challenge: Existing methods of prompt tuning cannot handle hard sequence labeling tasks.
Approach: They propose to optimize prompt tuning to tune continuous prompts with a frozen language model.
Outcome: The proposed method matches finetuning with prompt tuning while having only 0.1%-3% tuned parameters.

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