code: def tanimoto_coefficient(a, b):
      
      return sum(map(lambda (x,y): float(x)*float(y), zip(a,b))) / sum([
            -sum(map(lambda (x,y): float(x)*float(y), zip(a,b))),
             sum(map(lambda x: float(x)**2, a)),
             sum(map(lambda x: float(x)**2, b))])
docs: Measured similarity between two points in a multi-dimensional space.
  
      Returns:
          1.0 if the two points completely overlap,
          0.0 if the two points are infinitely far apart.