Data Science

Questions tagged [weighted-data]

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187
votes
8answers
233k views

How to set class weights for imbalanced classes in Keras?

I know that there is a possibility in Keras with the class_weights parameter dictionary at fitting, but I couldn't find any example. Would somebody so kind to ...
27
votes
3answers
33k views

xgboost: give more importance to recent samples

Is there a way to add more importance to points which are more recent when analyzing data with xgboost?
7
votes
1answer
3k views

CNN - imbalanced classes, class weights vs data augmentation

I have a set of data with a few strongly imbalanced classes, eg the smallest class is about 54 times smaller than the largest. Therefore, data augmentation in order to equalize the size of classes ...
5
votes
1answer
2k views

Why doesn't class weight resolve the imbalanced classification problem?

I know that in imbalanced classification, the classifier tends to predict all the test labels as larger class label, but if we use class weight in loss function, it would be reasonable to expect the ...
6
votes
1answer
10k views

Machine learning technique to calculate weighted average weights?

I'm just starting to investigate machine learning concepts, so I'm sorry if this question is very naive, but I'm hoping that it will be an easy one to answer! I have a document matching algorithm ...
5
votes
1answer
2k views

Purpose of weights in neural networks

I'm beginner at Neural Networks. After reading multiple articles on wikipedia, i've seen the term "weight" being used a lot, although it is a little confusing. I know, that before the inputs are ...