code: def group_sums(self, x, use_bincount=True):
      return group_sums(x, self.group_int, use_bincount=use_bincount)
  
imports: from statsmodels.compat.python import lrange, lzip
  import numpy
  import pandas
  import statsmodels.tools.data
  from pandas import Index, MultiIndex
label_desc: Use image node_id 6 for calling the Group obj's underlying member method code with example usage: obj.group_sums(x, use_bincount) and returns: group_sums