code: def _read_bias_rating(self, short_filename):
          
          res = {}
          full_name = os.path.join(root_fldr, 'aikif', 'data', 'ref', short_filename)
          lg.record_process('bias.py','reading ' + full_name)
           
          with open(full_name, 'r') as f:
              for line in f:
                  if line.strip('') == '':
                      break
                  bias_line = []
                  cols = line.split(',')
                  bias_line.extend([short_filename])
                  for col in cols:
                      bias_line.extend([col.strip('"').strip('\n')])
                  self.bias_details.append(bias_line)
docs: read the bias file based on the short_filename
          and return as a dictionary