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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_symbol(x):
 """Retrieve recorded computation history as `Symbol`. Parameters x : NDArray Array representing the head of computation graph. Returns ------- Symbol The retrieved Symbol. """

    hdl = SymbolHandle()
    check_call(_LIB.MXAutogradGetSymbol(x.handle, ctypes.byref(hdl)))
    return Symbol(hdl)