when I run mahout trainlogistic , there is an optional param --features

from the book "Mahout in action", it says:

--features
The size of the internal feature vector to use in building the model. A
larger value here can be helpful, especially with text-like input data


so is this something like buffer size so it does not affect the result of
the training? I thought the feature count to be considered in the model is
already explicitly given by the --predictors param


thanks
yang

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