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Task class and related functionality.
Task instructs the work to be peformed. A task is typically generated by the core task generation loop based on the state of MLMD db.
class CancelNodeTask: Task to instruct cancellation of an ongoing node execution.
class ExecNodeTask: Task to instruct execution of a node in the pipeline.
class HasNodeUid: Abstract class for node tasks.
class NodeUid: Unique identifier for a node in the pipeline.
class Task: Task instructs the work to be performed.
exec_node_task_id_from_pipeline_node(...): Returns task id of an
ExecNodeTask from pipeline and node.