Cross-Validation
Cross-validation is a statistical technique used to assess how well a machine learning model generalizes to unseen data. It involves partitioning a dataset into multiple subsets or “folds,” training the model on some of these subsets while testing it on the remaining ones. This process is repeated to ensure a reliable performance estimate. This helps detect overfitting and provides a more robust evaluation than a single train-test split. In the context of LLMs, cross-validation must be adapted to address the complexities of pre-training, fine-tuning, few-shot learning, and domain generalization, making it an essential tool for evaluating model performance across varied tasks and data distributions.
In this chapter, you will explore cross-validation strategies specifically designed for LLMs. We’ll delve into methods for creating appropriate data splits for pre-training and fine-tuning, as well as strategies for few-shot and zero-shot evaluation...