docstr: Return the grouped value.
docstr_tok: ["Return","the","grouped","value","."]
code: def getGrouped(self):
      """Return the grouped value."""
      raise NotImplementedError()
  
imports: import abc
  import datetime
  import six
  from pyalgotrade.utils import dt
  from pyalgotrade import bar
label_desc: Use image node_id 4 for calling the Grouper obj's underlying member method code with example usage: obj.getGrouped() without return types