code: def normalize(self, asOf=None, multiplier=100):
      """
      Returns a normalized series or DataFrame
  
      Example:
              Series.normalize()
  
      Returns: series of DataFrame
  
      Parameters:
      -----------
              asOf : string
                      Date format
                      '2015-02-29'
              multiplier : int
                      Factor by which the results will be adjusted
      """
      if not asOf:
          x0 = self.iloc[0]
      else:
          x0 = self.loc[asOf]
      return self / x0 * multiplier
  
imports: import pandas
  import re
label_desc: Use image node_id 4 for calling a global function with example usage: normalize(asOf, multiplier) and returns: unknown