Identify what group KNN classified a sample in
So as I'm understanding the question right you have the true group classification for your data.
In that case you can predict your whole dataset with your trained model and identify the outliers.
I want to be able to find which of my samples were wrongly classified by KNN, or which weren't classified at all. 
I have used sckit-learn to run KNN. I have a df that has ~280000 samples split into four groups, I have 13 features by which to classify by. My precsion per group ranges from 0.30-0.90. 
I expect the output to say which group each sample belongs to and which group it was classified into. 
thanks!