code: def get_rank_ic(a, b):
      """Rank IC
  
      Parameters
      ----------
      r : pandas.Series
          daily score series of feature
      b : pandas.Series
          daily return series
  
      """
      return spearmanr(a, b).correlation
  
imports: from __future__ import division
  from __future__ import print_function
  import numpy
  import pandas
  from scipy.stats import spearmanr, pearsonr
  from ..data import D
  from collections import OrderedDict
label_desc: Use image node_id 13 for calling a global function with example usage: get_rank_ic(a, b) and returns: spearmanr