human
Solve the following python programming problem given the following code:
def _computeSigma(thetaDotX, columns, splitLimit, start = 0, end = None) : 
    if (end is None) : 
        end = len (thetaDotX) 
if ((end - start) < splitLimit) : 
        numColumns = len (columns) 
        def unsymmetrizedElementAt(row, col) : 
            if (col < row) : 
                return 0.0 
right = columns [col] [start : end] 
            left = columns [row] [start : end] 
            weights = thetaDotX [start : end] 
            return _weightedDotProduct (right, left, weights) 
unsymmetrizedValues = [[unsymmetrizedElementAt (row, col) for col in xrange (numColumns)] for row in xrange (numColumns)] 
        symmetrizedValues = [] 
        for row in xrange (columns) : 
            for col in xrange (numColumns) : 
                if (row <= col) : 
                    elt = unsymmetrizedValues [row] [col] 
else : 
                    elt = unsymmetrizedValues [col] [row] 
symmetrizedValues = (symmetrizedValues + [elt]) 
tr = numpy.array (symmetrizedValues) 
        return tr.reshape ((numColumns, numColumns)) 
mid = ((start + end) / 2) 
    return (_computeSigma (thetaDotX, columns, splitLimit, start, mid) + _computeSigma (thetaDotX, columns, splitLimit, mid, end)) 

    
    

    Fix the buggy line: for row in xrange (columns) :
assistant
#Here is Python code to fix the buggy line: for row in xrange (columns) :
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for row in xrange (numColumns) :