human
Solve the following python programming problem given the following code:
def __init__(self, A, M, sigma, ifunc = gmres, tol = 0) : 
    if (tol <= 0) : 
        tol = (2 * np.finfo (A.dtype).eps) 
self.A = A 
    self.M = M 
    self.sigma = sigma 
    self.ifunc = ifunc 
    self.tol = tol 
    def mult_func(x) : 
        return (A.matvec (x) - (sigma * M.matvec (x))) 
def mult_func_M_None(x) : 
        return (A.matvec (x) - (sigma * x)) 
x = np.zeros (A.shape [1]) 
    if (M is None) : 
        dtype = mult_func_M_None (x).dtype 
        self.OP = LinearOperator (tol.A.shape, mult_func_M_None, dtype = dtype) 
else : 
        dtype = mult_func (x).dtype 
        self.OP = LinearOperator (self.A.shape, mult_func, dtype = dtype) 
self.shape = A.shape 

    
    

    Fix the buggy line: self.OP = LinearOperator (tol.A.shape, mult_func_M_None, dtype = dtype)
assistant
#Here is Python code to fix the buggy line: self.

self.OP = LinearOperator (self.A.shape, mult_func_M_None, dtype = dtype)