exception lsst.pipe.base.InvalidQuantumError

Exception that may be raised by PipelineTasks (and code they delegate to) in order to indicate logic bug or configuration problem.

This usually indicates that the configured algorithm itself is invalid and will not run on a significant fraction of quanta (often all of them).

This exception may be used as a base class for more specific questions, or used directly while chaining another exception, e.g.:

except SomeOtherError as err:
    raise RepeatableQuantumError() from err

Raising this exception in PipelineTask.runQuantum or something it calls is a last resort - whenever possible, such problems should cause exceptions in __init__ or in QuantumGraph generation. It should never be used for missing data.