(self)
return list(tz.unique(tz.concat(
            m.columns_used() for m in self.models.values())))
Columns from any table used in the model. May come from either
        the choosers or alternatives tables.
Columns from any table used in the model. May come from either
        the choosers or alternatives tables.
Columns from any table used in the model . May come from either the choosers or alternatives tables .
def columns_used(self):
        """
        Columns from any table used in the model. May come from either
        the choosers or alternatives tables.

        """
        return list(tz.unique(tz.concat(
            m.columns_used() for m in self.models.values())))
def columns_used ( self ) : return list ( tz . unique ( tz . concat ( m . columns_used ( ) for m in self . models . values ( ) ) ) )