This text provides a hands-on guide to building a language model for masked language modeling (MLM) tasks using Python and the Transformers library. It discusses the importance of large language models (LLMs) in the machine learning community and explains the concept and architecture of BERT (Bidirectional Encoder Representations from Transformers). The text also covers topics such as fine-tuning existing models, training a tokenizer, defining the BERT model, and setting up the training loop. Finally, it emphasizes the usefulness of pre-trained models and recommends fine-tuning whenever possible.
Hands-on guide to building language model for MLM tasks from scratch using Python and Transformers library
Introduction
In recent years, large language models (LLMs) have gained significant attention in the machine learning community. These models have revolutionized language modeling techniques, making them more accessible and manageable for downstream natural language processing (NLP) tasks.
Fine-tune or build one from scratch?
When adapting existing language models to specific use cases, fine-tuning can be a viable option. However, for certain tasks, building a model from scratch may be necessary. In this tutorial, we will focus on implementing the BERT model for masked language modeling.
BERT Architecture
BERT (Bidirectional Encoder Representations from Transformers) is a powerful language representation model introduced by Google in 2018. It pre-trains deep bidirectional representations from unlabeled text, allowing it to be fine-tuned for various tasks such as question answering and language inference.
Defining BERT model
With the Hugging Face Transformers library, we have complete control over defining the BERT model. We can customize the model’s configurations, such as the number of layers and attention heads, to suit our needs.
Training a tokenizer
Tokenization is a crucial step in language modeling. We can train a tokenizer from scratch using the Hugging Face tokenizers library. This allows us to create a vocabulary specific to our training corpus.
Define data collator and tokenize dataset
To prepare our dataset for masked language modeling, we need to define a data collator that masks a certain percentage of tokens. We can then tokenize our dataset using the trained tokenizer.
Training loop
Using the Trainer class from the Transformers library, we can train our BERT model on the tokenized dataset. The Trainer class handles the training process, including saving checkpoints and logging training progress.
Conclusion
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