What are the advantages and disadvantages of using naive bayes for spam detection?


Naive bayes is based on the conditional independence of features assumption – an assumption that is not valid in many real world scenarios. Hence it sometimes oversimplifies the problem by saying features are independant and gives sub par performance.


However, naive bayes is very efficient. It is a model you can train in a single iteration (no iteration) – fast to execute. Easily parallelizable. Works where there is less data and lots of features, like bag of words with text data.  Its model size/n. Of parameters is small and constant w.r.t data (unlike some others like decision trees), and tends to not to overfit (more likely to underfit than overefit).


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