Multilayer mlp gamma svm

[fjeze]

Added multiple layers to the mlp and mlpweightdecay model as separate model. Added regression test to both new models.

Added a new tuning parameter 'gamma' to svmlinear2, modified the tuning parameter in the regression test.

[topepo]

Sorry for the delay on this. Can you make one change to the SVM model code? For random search, you have

   gamma = sample(1:10, replace = TRUE, size = len))

That parameter doesn't have to be integer so using a uniform between two relevant values.

Thanks,

Max

[fjeze]

Your right, thats a better solution I.

I have changed both, to this:

cost = 2 ^((1:len) - 3)
gamma =10^((1:len) - 5)

If you think this is a good solution I will make a new PR

Cheers

[topepo]

Sounds fine to me.

[fjeze]

Made the change is this new #303 request