human
Solve the following python programming problem given the following code:
def adv_index_broadcastable_pattern(a, idx) : 
    '
    This function is only used to determine the broadcast pattern for
    AdvancedSubtensor output variable.

    For this, we make a fake ndarray and a fake idx and call use ask numpy
    the output. From this, we find the output broadcast pattern.

    ' 
    def replace_slice(v) : 
        if isinstance (v, gof.Apply) : 
            if (len (v.outputs) != 1) : 
                raise ValueError ('It is ambiguous which output of a multi-output Op has to be fetched.', v) 
else : 
                v = v.outputs [0] 
if NoneConst.equals (v) : 
            return None 
if isinstance (v.type, SliceType) : 
            return slice (None, None) 
return numpy.zeros (((2,) * v.ndim), int) 
newidx = tuple (map (replace_slice, idx)) 
    fakeshape = [(2 - bc) for bc in a.broadcastable] 
    retshape = numpy.empty (fakeshape) [idx].shape 
    return tuple ([(dim == 1) for dim in retshape]) 

    
    

    Fix the buggy line: retshape = numpy.empty (fakeshape) [idx].shape
assistant
#Here is Python code to find the output broadcast pattern.

retshape = numpy.empty (fakeshape) [newidx].shape