GraphBuilder

class lsst.pipe.base.GraphBuilder(taskFactory, registry, skipExisting=True)

Bases: object

GraphBuilder class is responsible for building task execution graph from a Pipeline.

Parameters:

taskFactory : TaskFactory

Factory object used to load/instantiate PipelineTasks

registry : Registry

Data butler instance.

skipExisting : bool, optional

If True (default) then Quantum is not created if all its outputs already exist, otherwise exception is raised.

Methods Summary

makeGraph(pipeline, originInfo, userQuery)

Create execution graph for a pipeline.

Methods Documentation

makeGraph(pipeline, originInfo, userQuery)

Create execution graph for a pipeline.

Parameters:

pipeline : Pipeline

Pipeline definition, task names/classes and their configs.

originInfo : DatasetOriginInfo

Object which provides names of the input/output collections.

userQuery : str

String which defunes user-defined selection for registry, should be empty or None if there is no restrictions on data selection.

Returns:

graph : QuantumGraph

Raises:

UserExpressionError

Raised when user expression cannot be parsed.

OutputExistsError

Raised when output datasets already exist.

Exception

Other exceptions types may be raised by underlying registry classes.