human
Solve the following python programming problem given the following code:
def computeMuSum(self, thetaDotX) : 
    def rowWiseScalarMultiplier(ix) : 
        return (1.0 / (1.0 + math.exp ((- thetaDotX [ix])))) 
columns = self.X.columns () 
    def computeWeightedColumnSum(columnIx) : 
        column = columns [columnIx] 
        return sum (((rowWiseScalarMultiplier (ix) * column [ix]) for ix in xrange (self.X.shape [0]))) 
return numpy.array ([computeWeightedColumnSum (columns) for columnIx in xrange (self.X.shape [1])]) 

    
    

    Fix the buggy line: return numpy.array ([computeWeightedColumnSum (columns) for columnIx in xrange (self.X.shape [1])])
assistant
#Here is Python code to fix the buggy line: return numpy.

return numpy.array ([computeWeightedColumnSum (columnIx) for columnIx in xrange (self.X.shape [1])])