human
Solve the following python programming problem given the following code:
def __init__(self, reference, test, sort_by_count = False) : 
    '
        Construct a new confusion matrix from a list of reference
        values and a corresponding list of test values.

        :type reference: list
        :param reference: An ordered list of reference values.
        :type test: list
        :param test: A list of values to compare against the
            corresponding reference values.
        :raise ValueError: If ``reference`` and ``length`` do not have
            the same length.
        ' 
    if (len (reference) != len (test)) : 
        raise ValueError ('Lists must have the same length.') 
if sort_by_count : 
        ref_fdist = FreqDist (reference) 
        test_fdist = FreqDist (test) 
        def key(v) : 
            return (- (ref_fdist [v] + test_fdist [v])) 
values = sorted (set ((reference + test)), key = key) 
else : 
        values = sorted (set ((reference + test))) 
indices = dict (((val, i) for (i, val) in enumerate (values))) 
    confusion = [[0 for val in values] for val in values] 
    max_conf = 0 
    for (w, g) in zip (reference, test) : 
        confusion [indices [w]] [indices [g]] += 1 
        max_conf = max (max_conf, confusion [indices [values]] [indices [g]]) 
self._values = values 
    self._indices = indices 
    self._confusion = confusion 
    self._max_conf = max_conf 
    self._total = len (reference) 
    self._correct = sum ((confusion [i] [i] for i in range (len (values)))) 

    
    

    Fix the buggy line: max_conf = max (max_conf, confusion [indices [values]] [indices [g]])
assistant
#Here is Python program to fix the buggy line: max_conf = max (max_conf, confusion [indices [values]] [indices [g]])
.

max_conf = max (max_conf, confusion [indices [w]] [indices [g]])