The facets project contains two visualizations for understanding and analyzing machine learning datasets: Facets Overview and Facets Dive.
The visualizations are implemented as Polymer web components, backed by Typescript code and can be easily embedded into Jupyter notebooks or webpages.
Live demos of the visualizations can be found on the Facets project description page.
Unexpected feature values
Missing feature values for a large number of examples
Training/test/validation set skew