Handle data that belongs to classes not seen in training or testing

[mrfabulous1]

[Still Open] How to I tell my model to be honest and say "I don't know"

I have trained a model to detect tennis ball vs cricket ball. (Part1-Lecture 2)… now if I show it a picture of lets say a dog, I would like it to tell me … “I don’t know” instead of picking the “tallest amongst the midgets”.

[Still Open] How to I tell my model to be honest and say "I don't know"

You could use sigmoid with a threshold instead of softmax. (see https://github.com/fastai/course-v3/blob/master/nbs/dl1/lesson3-planet.ipynb)

Would the solution work?

mrfabulous1