PrerequisiteDatasetKey

class lsst.pipe.base.quantum_graph_skeleton.PrerequisiteDatasetKey(parent_dataset_type_name: str, dataset_id_bytes: bytes, is_task: ClassVar[Literal[False]] = False, is_prerequisite: ClassVar[Literal[True]] = True)

Bases: NamedTuple

Identifier type for prerequisite dataset keys in a QuantumGraphSkeleton.

Unlike regular datasets, prerequisites are not actually required to come from a find-first search of input_collections, so we don’t want to assume that the same data ID implies the same dataset. Happily we also don’t need to search for them by data ID in the graph, so we can use the dataset ID (UUID) instead.

Attributes Summary

dataset_id_bytes	Dataset ID (UUID) as raw bytes.
is_prerequisite	Alias for field number 3
is_task	Whether this node represents a quantum or task initialization rather than a dataset (always False).
parent_dataset_type_name	Name of the dataset type (never a component).

Methods Summary

count(value, /)	Return number of occurrences of value.
index(value[, start, stop])	Return first index of value.

Attributes Documentation

dataset_id_bytes: bytes

Dataset ID (UUID) as raw bytes.

is_prerequisite: ClassVar[Literal[True]]

Alias for field number 3

is_task: ClassVar[Literal[False]]

Whether this node represents a quantum or task initialization rather than a dataset (always False).

parent_dataset_type_name: str

Name of the dataset type (never a component).

Methods Documentation

count(value, /)

Return number of occurrences of value.

index(value, start=0, stop=sys.maxsize, /)

Return first index of value.

Raises ValueError if the value is not present.