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Getting started with the LSST Science Pipelines
Installing the LSST Science Pipelines
Data access and pipeline middleware
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lsst-pipe-base v29.1.0 (2025-06-13)

Overview of the task framework

Creating a task
Testing a pipeline task
Creating a PipelineTask
Retargeting subtasks of tasks

Creating a Pipeline
Testing pipelines with mocks
Working with Pipeline Graphs

iterConnections

compare_packages
log_config_mismatch

ConnectionTypeConsistencyError
DatasetTypeNode
DuplicateOutputError
Edge
EdgesChangedError
IncompatibleDatasetTypeError
InvalidExpressionError
InvalidStepsError
NodeBipartite
NodeKey
NodeType
PipelineDataCycleError
PipelineGraph
PipelineGraphError
PipelineGraphExceptionSafetyError
PipelineGraphReadError
ReadEdge
StepDefinitions
TaskImportMode
TaskInitNode
TaskNode
TaskNotImportedError
TaskSubset
UnresolvedGraphError
WriteEdge

assertValidInitOutput
assertValidOutput
getInitInputs
lintConnections
makeQuantum
runTestQuantum

BaseConnection
InitInput
InitOutput
Input
Output
PrerequisiteInput

ConfigIR
ContractError
ContractIR
ImportIR
LabeledSubset
ParametersIR
PipelineIR
TaskIR

get_mock_name
get_original_name
is_mock_name
mock_pipeline_graph

ConvertedUnmockedDataset
DataIdMatch
DirectButlerRepo
DynamicConnectionConfig
DynamicTestPipelineTask
DynamicTestPipelineTaskConfig
ForcedFailure
InMemoryRepo
MockAlgorithmError
MockDataset
MockDatasetQuantum
MockPipelineTask
MockPipelineTaskConfig
MockRepo
MockStorageClass
MockStorageClassDelegate

lookup_quantum_data_id

DatasetTypeExecutionReport
QuantumGraphExecutionReport
TaskExecutionReport

SimplePipelineExecutor

SeparablePipelineExecutor

QuantumGraphDotVisualizer
QuantumGraphMermaidVisualizer
QuantumGraphVisualizer

EmptyDimensionsDatasets
OutputExistsError
PrerequisiteMissingError
QuantumGraphBuilder
QuantumGraphBuilderError

DatasetKey
PrerequisiteDatasetKey
QuantumGraphSkeleton
QuantumKey
TaskInitKey

PrerequisiteBounds
PrerequisiteFinder
PrerequisiteInfo
SkyPixBoundsBuilder
TimespanBuilder

AllDimensionsQuantumGraphBuilder

DatasetQueryConstraintVariant

ExecutionGraphFixup

ExecutionGraphFixup

LogCapture

MPGraphExecutor
MPGraphExecutorError
MPTimeoutError

QuantumExecutor
QuantumGraphExecutor

ExceptionInfo
ExecutionStatus
QuantumReport
Report

SingleQuantumExecutor

lsst.pipe.base
InvalidStepsError

InvalidStepsError#

exception lsst.pipe.base.pipeline_graph.InvalidStepsError#

Bases: PipelineGraphError

Exception raised when the step definitions are invalid.

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InvalidStepsError

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