[Project] Stanford-Cars with fastai v1

[morgan (Morgan McGuire)]

Thanks @muellerzr, nice tick, posting one of your answers here for future reference:

Tabular: validation set percentage

@mindtrinket @Bliss here is a notebook that shows an example of what to do and not to do via the Lesson 4 Tabular Notebook example: This setup also allows us to run ClassificationInterpretation on the test set to analyze what we were missing and by how much