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Machine learning with evolving set of features ?

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Hi all,

I was recently wondering about how machine learning systems are developed in real world, especially when there could be new data streams and new features in the future.

Imagine, there is a customer marketing model, which uses data from 20 separate sources and integrates them together and learns a classifier/predictor. Now six months down the line, there is a possibility of adding another set of features which were previously not explored in the model.

How does the integration take place ? In a batch setting, is the model recreated from scratch, assuming missing values for data not available ? or is there a way to update the model without rerunning the entire system ?

submitted by dexter89_kp
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