the map from feature names to values
Returns the value of the specified feature name.
Returns the value of the specified feature name.
Note that this returns zero if the feature is not present in the map.
the feature name of interest
the value assigned to that feature name
the map from feature names to values
A mapping from feature names to values.
Unspecified feature names are assumed to correspond to a value of zero.
the map from feature names to values