Seaborn
Software / App
A Python data visualization library based on Matplotlib, used here to create a heatmap for the confusion matrix.
Mentioned in 2 videos
Videos Mentioning Seaborn

Python for AI #3: How to Train a Machine Learning Model with Python
AssemblyAI
A Python data visualization library based on Matplotlib, used here to create a heatmap for the confusion matrix.

Torch Tutorial (Alex Wiltschko, Twitter)
Lex Fridman
A Python data visualization library based on Matplotlib, providing a high-level interface for drawing attractive statistical graphics.