def __init__(self, use_idf=True, k1=2.0, b=0.75):
    self.use_idf = use_idf
    self.k1 = k1
    self.b = b
def __init__(self, use_idf=True, k1=2.0, b=0.75):
    self.use_idf = use_idf
    self.k1 = k1
    self.b = b