Define and store data for the Unranked Boolean Retrieval Model.

Classes
		RetrievalModel.RetrievalModel(builtins.object) RetrievalModelUnrankedBoolean   class RetrievalModelUnrankedBoolean(RetrievalModel.RetrievalModel)     RetrievalModelUnrankedBoolean(b=0.75, k_1=1.2, k_3=0.0)   Define and store data for the Unranked Boolean Retrieval Model.     Method resolution order: RetrievalModelUnrankedBoolean RetrievalModel.RetrievalModel builtins.object Methods defined here: __init__(self, b=0.75, k_1=1.2, k_3=0.0) Initialize self.  See help(type(self)) for accurate signature. Methods inherited from RetrievalModel.RetrievalModel: defaultQrySopName() The name of the default query operator for the retrieval model.   Returns the name of the default query operator. Data descriptors inherited from RetrievalModel.RetrievalModel: __dict__ dictionary for instance variables (if defined) __weakref__ list of weak references to the object (if defined) Data and other attributes inherited from RetrievalModel.RetrievalModel: sys = <module 'sys' (built-in)>