def METHOD_NAME():
    """
    Return the name of the CPU vendor ID.
    :return: the name of the CPU vendor ID in string
    :rtype: string
    :raises: An OSError will be raised if it's NOT available on the platform
    """
    vendor_re = "(?m)^vendor_id\s+:\s+(\w+)$"
    with open("/proc/cpuinfo") as fd:
        cpu_info = fd.read()
    vendor_id = re.search(vendor_re, cpu_info)
    if not vendor_id:
        raise OSError("The vendor id was NOT found!")
    vendor_id = vendor_id.groups()[0]
    return vendor_id