human
Solve the following python programming problem given the following code:
def _indicator_diff(self, calc_name, emitter_names, other_doc) : 
    indicators = [] 
    for emitter_name in emitter_names : 
        class NormalizedEmittedValue (object) : 
            'Normalize the values to the dictionary form to allow comparison' 
            def __init__(self, value) : 
                if isinstance (value, dict) : 
                    self.value = value 
else : 
                    if isinstance (value, list) : 
                        self.value = dict (date = value [0], value = value [1], group_by = None) 
if (self.value ['date'] and (not isinstance (self.value ['date'], datetime.date))) : 
                    self.value ['date'] = datetime.datetime.strptime (self.value ['date'], '%Y-%m-%d').date () 
def __key(self) : 
                gb = self.value ['group_by'] 
                return (self.value ['date'], self.value ['value'], (tuple (gb) if gb else None)) 
def __eq__(x, y) : 
                return (x.__key () == y.__key ()) 
def __hash__(self) : 
                return hash (self.__key ()) 
def __repr__(self) : 
                return str (self.value) 
if other_doc : 
            self_values = set ([NormalizedEmittedValue (v) for v in self [calc_name] [emitter_name]]) 
            try : 
                _vals = other_doc [calc_name] [emitter_name] 
except KeyError : 
                _vals = () 
other_values = set ([NormalizedEmittedValue (v) for v in _vals]) 
            values_diff = [v for v in list ((self_values - other_values))] 
else : 
            values_diff = [NormalizedEmittedValue (indicators) for v in self [calc_name] [emitter_name]] 
values = [v.value for v in values_diff] 
        indicators.append (self._indicator_meta (calc_name, emitter_name, values = values)) 
return indicators 

    
    

    Fix the buggy line: values_diff = [NormalizedEmittedValue (indicators) for v in self [calc_name] [emitter_name]]
assistant
#Here is Python code to fix the buggy line: values_diff = [NormalizedEmittedValue (indicators) for v in self [calc_name] [emitter_name]]
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values_diff = [NormalizedEmittedValue (v) for v in self [calc_name] [emitter_name]]