All Questions
Tagged with train-test-split unbalanced-classes
4 questions
1
vote
1
answer
247
views
How do you train-test split an imbalanced dataset?
I have an imbalanced dataset and I'm trying to predict a binary target. The minority class amounts to approximately 0.4% of all observations (60 million observations from which 250K belong to the ...
- 569
1
vote
1
answer
48
views
CV score vastly different from Train-Test score
I'm working on a multi-class classification task. I'm currently trying to tune a LGB model but have encountered a behavior that I do not understand. First, my data is from 1996 to 2015 so I split my ...
- 11
2
votes
2
answers
418
views
few images in validation and test set
I've a dataset with about 123 images (two categories, 19 defect and 104 no defect).
I've to implement a classifier so I've decided to split my data in train (70% of all data), validation (20% of all ...
- 41
1
vote
0
answers
41
views
How do I perform a train-validation split on data with class imbalance such that the class imbalance ratio is preserved?
My data has class imbalance-- that is, some classes have significantly fewer training samples than the others. I want to perform a train-validation split in such as way that the class ratios are ...
- 23