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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 get_backend_symbol(self, backend):
 """Return symbol for target backend. Parameters backend : str The backend names. Returns ------- out : Symbol The created Symbol for target backend. """

        out = SymbolHandle()
        check_call(_LIB.MXGenBackendSubgraph(self.handle, c_str(backend), ctypes.byref(out)))
        return Symbol(out)