JSON Interoperability

Many of the classes and objects in Brush can be serialized to and from json. This is achieved using the cpp json package. It means you can, for example, write programs as Python dictionaries like so:

json_program = {
    "Tree": [
        { "node_type":"Add", "is_weighted": True },
        { "node_type":"Terminal", "feature":"x1"},
        { "node_type":"Terminal", "feature":"x2"}
    ],
    "is_fitted_":False
}

This program is a weighted addition of x1 and x2, i.e.,

\[c_1 x_1 + c_2 x_2\]

. Note the dictionary must contain keys for all members of the Program class, Tree and is_fitted_. We can turn this directly into a regressor:

PRG = Regressor(json_program)
print( "program:", PRG.get_model())