code: def get_alpha(r, b, risk_free_rate=0.03):
      beta = get_beta(r, b)
      annaul_r = get_annaul_return_from_return_series(r)
      annaul_b = get_annaul_return_from_return_series(b)
  
      alpha = (
          annaul_r - risk_free_rate - beta * (annaul_b - risk_free_rate)
      )
  
      return alpha
  
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 11 for calling a global function with example usage: get_alpha(r, b, risk_free_rate) and returns: alpha