Challenge: Pre-trained language models have shown remarkable memory formation, but vanilla networks without pre-training suffer catastrophic forgetting problem.
Approach: They conduct experiments to investigate the retentive-forgetful contradiction between vanilla and pre-trained language models by controlling the target knowledge types, learning strategies and learning schedules.
Outcome: The results show that pre-trained language models are forgetful and pre-training leads to retentive models .

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Exploring Forgetting in Large Language Model Pre-Training (2025.acl-long)

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Challenge: Existing research on task-level forgetting in LLMs has focused on pretraining . but, there is limited attention to finer-grained forgetting during training .
Approach: They investigated the existence and measurement of forgetting in pre-training . they examined low-cost, straightforward methods to mitigate forgetting during the pre- training phase .
Outcome: The proposed methods could be used to mitigate forgetting during the pre-training phase and offer insights into the dynamics of forgetting.
Demystifying Verbatim Memorization in Large Language Models (2024.emnlp-main)

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Challenge: Existing studies have shown that Large Language Models (LLMs) memorize long sequences verbatim, with serious copyright and privacy implications.
Approach: They develop a framework to study verbatim memorization in a controlled setting by continuing pre-training from Pythia checkpoints with injected sequences.
Outcome: The proposed framework creates a control model M () and a treatment model M with injected sequences.
Memorisation versus Generalisation in Pre-trained Language Models (2022.acl-long)

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Challenge: State-of-the-art pre-trained language models have been shown to memorise facts and perform well with limited amounts of training data.
Approach: They propose to extend pre-trained language models to generalise and memorise facts in noisy and low-resource scenarios.
Outcome: The proposed extension improves performance in low-resource named entity recognition tasks.
Machine Unlearning of Pre-trained Large Language Models (2024.acl-long)

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Challenge: Using curated datasets, we establish a robust benchmark for unlearning performance, demonstrating that these methods are over 105 times more computationally efficient than retraining.
Approach: They propose a framework for machine unlearning in pre-trained LLMs and integrate gradient ascent with gradient descent on in-distribution data to achieve robustness.
Outcome: The proposed framework is over 105 times more efficient than retraining on in-distribution data and provides detailed guidelines for efficient hyperparameter tuning in the unlearning process.
An Embarrassingly Simple Approach for Transfer Learning from Pretrained Language Models (N19-1)

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Challenge: Existing transfer learning methods employ language models pretrained on large generic corpora, but results come at a high computational cost and require task-specific architectures.
Approach: They propose a transfer learning approach that combine a task-specific optimization function with an auxiliary language model objective, which is adjusted during the training process.
Outcome: The proposed method surpasses well established transfer learning methods with greater level of complexity on a variety of affective and text classification tasks surpassing well established methods with higher level of difficulty.
Knowledge Mechanisms in Large Language Models: A Survey and Perspective (2024.findings-emnlp)

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Challenge: Using large language models, we can understand knowledge mechanisms in LLMs for learning, storage, utilization, and evolution.
Approach: They propose to analyze knowledge mechanisms in Large Language Models (LLMs) they examine utilization, evolution, and the potential dark knowledge (hypothesis) they hope to help understand knowledge in LLMs and provide insights for future research .
Outcome: The proposed model can be used to analyze the evolution of parametric knowledge in LLMs.
Erasing Without Remembering: Implicit Knowledge Forgetting in Large Language Models (2026.acl-long)

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Challenge: a new method for unlearning large language models is proposed to improve the performance of large language model models.
Approach: They propose a probability perturbation-based unlearning paradigm that allows models to forget implicit knowledge in large language models with a focus on generalisation.
Outcome: The proposed model improves unlearning vanilla target data while forgetting implicit knowledge.
How Do Multilingual Language Models Remember Facts? (2025.findings-acl)

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Challenge: Prior research has focused on English monolingual models, but how these mechanisms generalize to non-English languages remains unexplored.
Approach: They analyze three multilingual LLMs to find out how they can generalize recall mechanisms . they find that subject enrichment is language-independent, object extraction is language dependent .
Outcome: The proposed model performs better in multilingual contexts than in English models . the model is more efficient in multi-lingual context, but it is more complex in multilinguistic models compared to English models.
How Do LLMs Acquire New Knowledge? A Knowledge Circuits Perspective on Continual Pre-Training (2025.findings-acl)

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Challenge: Large Language Models (LLMs) have exceptional capabilities in knowledge-intensive tasks . however, they struggle with knowledge updates due to dynamic nature of world knowledge .
Approach: They propose to identify computational subgraphs that facilitate knowledge storage and processing . they also identify a phase shift from formation to optimization in LLMs .
Outcome: The proposed model can capture factual knowledge from pre-training corpus and encapsulate it as extensive parametric knowledge.
Exploring Memorization in Fine-tuned Language Models (2024.acl-long)

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Challenge: Existing studies have shown that pre-trained langauge models tend to memorize and regenerate segments of their pre-training corpus when prompted appropriately.
Approach: They conduct the first comprehensive analysis to explore language models’ memorization during fine-tuning across tasks.
Outcome: The proposed analysis shows that memorization presents a strong disparity among different fine-tuning tasks.

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