Registers a flag whose value can be any string from enum_values.
tf.compat.v1.flags.DEFINE_enum(
name, default, enum_values, help, flag_values=_flagvalues.FLAGS,
module_name=None, **args
)
Instead of a string enum, prefer DEFINE_enum_class, which allows
defining enums from an enum.Enum class.
name: str, the flag name.default: str|None, the default value of the flag.enum_values: [str], a non-empty list of strings with the possible values for
the flag.help: str, the help message.flag_values: FlagValues, the FlagValues instance with which the flag will
be registered. This should almost never need to be overridden.module_name: str, the name of the Python module declaring this flag.
If not provided, it will be computed using the stack trace of this call.**args: dict, the extra keyword args that are passed to Flag init.