How to use the smmap.util.is_64_bit function in smmap

self._max_memory_size = max_memory_size
        self._max_handle_count = max_open_handles
        self._memory_size = 0
        self._handle_count = 0

        if window_size < 0:
            coeff = 64
            if is_64_bit():
                coeff = 1024
            # END handle arch
            self._window_size = coeff * self._MB_in_bytes
        # END handle max window size

        if max_memory_size == 0:
            coeff = 1024
            if is_64_bit():
                coeff = 8192
            # END handle arch
            self._max_memory_size = coeff * self._MB_in_bytes
        # END handle max memory size