Runtime parameter.

Currently only supported on KubeflowDagRunner.

For protos, use text type RuntimeParameter, which holds the proto json string, e.g., '{"num_steps": 5}' for TrainArgs proto.

name The name of the runtime parameter.
default Default value for runtime params when it's not explicitly specified.
ptype The type of the runtime parameter.
description Description of the usage of the parameter.



Return self==value.