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3 questions
11
votes
1
answer
19k
views
Differences between class_weight and scale_pos weight in LightGBM
I have a very imbalanced dataset with the ratio of the positive samples to the negative samples being 1:496. The scoring metric is the f1 score and my desired model is LightGBM. I am using the sklearn ...
2
votes
0
answers
2k
views
Binary classification with imbalanced dataset, about lightgbm output probability distribution
I trained a binary classifier for an imbalanced dataset. I did two experiments:
lightgbm classifier, boosting_type='gbdt', objective='cross_entropy', SMOTE upsample
After training the lgbm model, I ...
- 21
2
votes
0
answers
185
views
cost sensitive loss function in lightbm with individual cost
i am looking for a cost sensitive function that will have weights according to individual row feature (like amount)
this way i can penalize more FN which has large amount vs. low dollar amount.
took ...
- 121