tf.compat.v1.flags.register_validator

Adds a constraint, which will be enforced during program execution.

The constraint is validated when flags are initially parsed, and after each change of the corresponding flag's value.

flag_name str | FlagHolder, name or holder of the flag to be checked. Positional-only parameter.
checker callable, a function to validate the flag.

  • input - A single positional argument: The value of the corresponding flag (string, boolean, etc. This value will be passed to checker by the library).

  • output - bool, True if validator constraint is satisfied. If constraint is not satisfied, it should either return False or raise flags.ValidationError(desired_error_message).

message str, error text to be shown to the user if checker returns False. If checker raises flags.ValidationError, message from the raised error will be shown.
flag_values flags.FlagValues, optional FlagValues instance to validate against.

AttributeError Raised when flag_name is not registered as a valid flag name.
ValueError Raised when flag_values is non-default and does not match the FlagValues of the provided FlagHolder instance.