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Diffstat (limited to 'docs/mllib-naive-bayes.md')
| -rw-r--r-- | docs/mllib-naive-bayes.md | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/docs/mllib-naive-bayes.md b/docs/mllib-naive-bayes.md index 86d94aebd9..7f9d4c6563 100644 --- a/docs/mllib-naive-bayes.md +++ b/docs/mllib-naive-bayes.md @@ -17,7 +17,8 @@ Bayes](http://en.wikipedia.org/wiki/Naive_Bayes_classifier#Multinomial_naive_Bay which is typically used for [document classification](http://nlp.stanford.edu/IR-book/html/htmledition/naive-bayes-text-classification-1.html). Within that context, each observation is a document and each -feature represents a term whose value is the frequency of the term. +feature represents a term whose value is the frequency of the term. +Feature values must be nonnegative to represent term frequencies. [Additive smoothing](http://en.wikipedia.org/wiki/Lidstone_smoothing) can be used by setting the parameter $\lambda$ (default to $1.0$). For document classification, the input feature vectors are usually sparse, and sparse vectors should be supplied as input to take advantage of |