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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def gradient(self, wrt):
 """Gets the autodiff of current symbol. This function can only be used if current symbol is a loss function. .. note:: This function is currently not implemented. Parameters wrt : Array of String keyword arguments of the symbol that the gradients are taken. Returns ------- grad : Symbol A gradient Symbol with returns to be the corresponding gradients. """

        handle = SymbolHandle()
        c_wrt = c_str_array(wrt)
        check_call(_LIB.MXSymbolGrad(self.handle,
                                     mx_uint(len(wrt)),
                                     c_wrt,
                                     ctypes.byref(handle)))
        return Symbol(handle)