Questions tagged [weighted-data]

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221
votes
10answers
291k 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 ...
4
votes
1answer
810 views

Sklearn Linear Regression examples

Could someone give an example of the application of Tf-idf with sparse data (lots of zeros) in sklearn? I am not quite sure where to insert the weight of Tf-idf and how to rightly obtain the weight. ...
3
votes
1answer
2k views

How can the process of hypertuning of XGBoost parameters be automated?

I'm using xgboost for training a model on a data with extreme class imbalance. After referring from here. After performing grid search and some manual settings, I ...
3
votes
2answers
2k views

How can give weight to feature before PCA

I wonder how can I give weight to my feature before employing PCA. I mean somehow weighted PCA. Because I know that one of the features is better than others and want to give importance to it in ...
6
votes
1answer
12k 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 ...
1
vote
3answers
4k views

@RISK Vs R. Monte Carlo simulation in R?

Are there any cheaper or open source alternatives to @RISK or are there packages for R that would be able to perform the same tasks? http://www.palisade.com/risk/ @RISK (pronounced “at risk”) ...
2
votes
2answers
257 views

Sort by average votes/ratings

I have a data set that's a dictionary of tuples. Each key represents an ID number and each tuple is (yesvotes, totalvotes). Example: ...
28
votes
3answers
38k 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?
2
votes
2answers
142 views

Creating validation data for model comparison

I am working on building a scoring algorithm for student data, say the attributes are : name, location, age, class, school_name, skill1, skill2, skill3 based ...

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