In the second episode of a series on applied NLP, Jay Alammar engages with Vincent Warmerdam, a machine learning engineer at Explosion, to discuss tools designed to enhance training data quality. Vincent, known for his work on NLP tools for the scikit-learn ecosystem, showcases a range of tools aimed at improving data preprocessing and labeling, addressing common issues of poorly labeled datasets, which can lead to good accuracy metrics but faulty predictions. The session highlights tools like Human-learn for building human-based scikit-learn components, Doubtlab for identifying doubtful labels, Embetter for utilizing embeddings in scikit-learn, and Bulk for leveraging bulk labeling through embeddings. These tools are intended to make the data preparation process more transparent and support human involvement more effectively, with the discussion encouraging further exploration and conversation on Discord.