| Challenge: | Pre-trained contextualized representations are used to analyze information in NLP . however, how fine-tuning changes the underlying embedding space is less studied . |
| Approach: | They propose to use probing techniques to analyze how fine-tuning changes the embedding space of pre-trained contextualized representations. |
| Outcome: | The proposed model improves classification performance by increasing the distances between examples associated with different labels. |
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On the Interplay Between Fine-tuning and Sentence-level Probing for Linguistic Knowledge in Pre-trained Transformers (2020.findings-emnlp)
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| Challenge: | linguistic knowledge encoded in pre-trained contextual embeddings is poorly understood . fine-tuning can be used to investigate the representations of pre-train models . |
| Approach: | They propose to investigate fine-tuning of contextualized embedding models through sentence-level probing. |
| Outcome: | The proposed method improves probing accuracy for three pre-trained models. |
How Does Fine-tuning Affect the Geometry of Embedding Space: A Case Study on Isotropy (2021.findings-emnlp)
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| Challenge: | Existing methods for fine-tuning pre-trained language models are ineffective, despite their potential, pre-training models suffer from important weaknesses. |
| Approach: | They analyze the extent to which the isotropy of the embedding space changes after fine-tuning. |
| Outcome: | The proposed model improves the isotropy of embedding space after fine-tuning . the model can encode linguistic properties, but lacks the social bias needed to improve it . |
On the Nature of BERT: Correlating Fine-Tuning and Linguistic Competence (2022.coling-1)
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| Challenge: | Several studies on the interpretation of Neural Language Models (NLMs) focus on the linguistic generalization abilities of pre-trained models, but little attention is paid to how the linguistic knowledge of the models changes during fine-tuning. |
| Approach: | They propose to examine whether a wide range of linguistic phenomena are forgotten during fine-tuning and whether it is possible to predict the fine- tuned accuracy solely relying on the assessed linguistic competence. |
| Outcome: | The proposed model can predict the evolution of written language competence of native language learners based on the assessed linguistic competence. |
On the Transformation of Latent Space in Fine-Tuned NLP Models (2022.emnlp-main)
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| Challenge: | a large body of work analyzed the knowledge learned within representations of pre-trained models. |
| Approach: | They use hierarchical clustering to discover latent concepts in representational space . they compare pre-trained and fine-tuned models and perform a thorough analysis . |
| Outcome: | The results show that the model space evolves towards task-specific concepts whereas the lower layers retain generic concepts acquired in the pre-trained model. |
Investigating Learning Dynamics of BERT Fine-Tuning (2020.aacl-main)
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| Challenge: | Recent studies have shown that the fine-tuning process improves performance on downstream tasks. |
| Approach: | They propose two new pre-training tasks to improve the model performance on downstream tasks. |
| Outcome: | The proposed model achieves state-of-the-art on a wide array of NLP tasks. |
On the evolution of syntactic information encoded by BERT’s contextualized representations (2021.eacl-main)
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| Challenge: | Existing studies have focused on how linguistic information is encoded in pretrained language models to solve supervised tasks. |
| Approach: | They analyze how the syntax trees are embedded in the geometry of pretrained models for six different tasks, covering all levels of the linguistic structure. |
| Outcome: | The proposed model is able to learn and improve on GLUE and SQUAD, but it lacks the ability to learn the linguistic information required to solve the tasks. |
Contextual Embeddings: When Are They Worth It? (2020.acl-main)
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| Challenge: | In recent years, rich contextual embeddings have enabled rapid progress on benchmarks like GLUE, but require significant computational resources during pretraining and during downstream task training and inference. |
| Approach: | They empirically compare contextual embeddings with classic pretrained embedders and a random word embeddable with a simple baseline. |
| Outcome: | The proposed models perform within 5 to 10% accuracy on industry-scale data. |
A Primer in BERTology: What We Know About How BERT Works (2020.tacl-1)
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| Challenge: | a new study examines the current state of knowledge about the BERT model . the model is a stack of transformer encoder layers that are based on multiple self-attention ''heads'' |
| Approach: | They present a survey of over 150 studies of the popular Transformer-based model BERT . they discuss the current state of knowledge about how BERT works and how it is represented . |
| Outcome: | The proposed model is based on the Transformer-based model with state-of-the-art results . the proposed model has little cognitive motivation and is too small to perform ablation studies . |
On the Importance of Data Size in Probing Fine-tuned Models (2022.findings-acl)
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| Challenge: | Several studies have investigated the reasons behind the effectiveness of fine-tuning, usually through the lens of probing. |
| Approach: | They propose to investigate the reasons behind the effectiveness of fine-tuning by examining the impact of data size on the extent of encoded linguistic knowledge. |
| Outcome: | The proposed probes show that the size of the training data affects the recoverability of the changes made to the model’s linguistic knowledge. |
Demographic-Aware Language Model Fine-tuning as a Bias Mitigation Technique (2022.aacl-short)
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| Challenge: | In this paper, we analyze the variations in gender and racial biases in BERT-like language models when exposed to different demographic groups. |
| Approach: | They analyze gender and racial biases in BERT-like language models when exposed to different demographic groups. |
| Outcome: | The proposed model can mitigate biases in text authored by disadvantaged demographic groups compared to advantaged groups . the proposed model is agnostic to the language of the speakers behind the language . |