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I'm very new to text mining. I am trying to build a classifier which assigns zero, one or more topics to each document of the Reuters 21578 dataset. However, I'm not sure how to make it work using standard R packages. I've looked at a lot of simple online examples using packages such as RTextTools and RWeka, etc. which creates classifier to assign one topic to each document and I'm stuck as I can't directly follow the examples to achieve what I desire. Thanks in advance!

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I think what you are looking for is multilabel classification.I used mlr package in R ; I followed this link to achieve it.

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