LeJit

def plotComplexPointsAndVectors(locations, derivatives):
      X,Y = zip(*map(lambda x: (x.real, x.imag), locations))
      U,V = zip(*map(lambda x: (x.real, x.imag), derivatives))
      plt.plot(X,Y, "ro-", label="python")
      limit = np.max(np.ceil(np.absolute(points)))
      plt.xlim((-limit, limit))
      plt.ylim((-limit, limit))
      plt.xlabel("Real")
      plt.ylabel("Imaginary")
      plt.quiver(X,Y,U,V, linewidths = 2)

LeJit

from math import pow, sqrt

def cosine(ratings1, ratings2):
    norm1 = sum([pow(rating,2) for rating in ratings1.values()])
    norm2 = sum([pow(rating,2) for rating in ratings2.values()])
    intersect_keys = filter(lambda x: x in ratings1.keys(), ratings2.keys())
    dot_product = sum([ratings1[key]*ratings2[key] for key in intersect_keys])
    cosine_distance = dot_product/(sqrt(norm1*norm2))
    return cosine_distance