A=MAP(H) returns a map object initialized with hyperparameters H.
MAP is a general object for mapping data, it takes a supplied
mapping function which can transform the given input data. The
function can use four hyperparmeters p1,p2,p3,p4.
Hyperparameters, and their defaults
func='d.X=tanh((d.X+a.p1)*a.p2)' -- function we wish to use.
This can be changed at will,
it can access the object 'd' (data)
and 'a' (mapping algorithm), e.g
d.X, d.Y, a.p1, a.p2, etc. and
usual matlab functions. It should
store the new values in d.X.
The default is a sigmoid mapping.
p1=1,p2=0,p3=[],p4=[] -- user parameters