> The Spider Objects

>            TOY object

>        A=TOY(H) returns a toy object initialized with hyperparameters H.

>        This generates toy data from a uniform distribution in (n)
>        dimensions, only (relevant_n) of which are used to label the data
>        (the last few features n-relevant_n:n are relevant).

>        Hyperparameters, and their defaults
>         l=30          -- examples
>         n=30          -- dimensions
>         relevant_n=10 -- number of dimensions relevant to output
>         seed=-1       -- random seed used to generate it, if -1 do not
>                          set seed

>        Model
>         w             -- stores label model

>        Methods:
>         generate,train,test