def get_device_profile_group_requester_id(dp_group_id):
    """Return the value to use in objects.RequestGroup.requester_id.

    The requester_id is used to match device profile groups from
    Cyborg to the request groups in request spec.

    :param dp_group_id: The index of the request group in the device profile.
    """
    req_id = "device_profile_" + str(dp_group_id)
    return req_id