Minor Description
LogisticRegressionModel.predictPoint could be optimized some. There are several checks which could be moved outside loops or even outside predictPoint to initialization of the model.
Some include:
require(numFeatures == weightMatrix.size)
val dataWithBiasSize = weightMatrix.size / (numClasses - 1)
val weightsArray = weightMatrix match { ...
if (dataMatrix.size + 1 == dataWithBiasSize) {...
Also, for multiclass, the 2 loops (over numClasses and margins) could be combined into 1 loop.
