> The Spider Objects

>       NORMALIZE normalization object - simple normalization of data

>        A=NORMALIZE(H) returns a normalize object initialized with hyperparameters H.

>         Performs different kinds of pre-processing on data.

>         Hyperparameters, and their defaults
>         a.scale_type=0    -- 0: do nothing,
>                              1: columns have mean 0, std 1
>                              2: rows have mean, std 1
>         		                3: try to do do both 1 & 2
>                              4: scale by correlation coefficients
>         a.sigmoid=0       -- yes or no, scale features nonlinearly through a
>                              sigmoid, i.e f(x)=tanh(sig*x)

>         Model parameters
>          mean_vec         -- threshold vectors
>          scale_vec        -- scaling factors
>          sig              -- sigmoid steepness parameter
>          corr             -- correlation coefficients