gistfile1.py

 343 def sparsify(m, value=100):                                                                                                                                                                                                            
 344 
 345     matrix = m.tolil()
 346     rows, columns = matrix.shape
 347     sparseindex = matrix.mean(axis=1) * (value/float(100))
 348     for r in range(rows):
 349         z = np.where(matrix.tocsr()[r].todense() < sparseindex[r])[1]
 350         for c in range(z.shape[1]):
 351             var = int(z[0,c])
 352             matrix[r, var] =  0
 353 
 354     return matrix.tocsr()