How to use the pypyr.cache.pipelinecache.pipeline_cache.get_pipeline function in pypyr

"""
    logger.debug("you asked to run pipeline: %s", pipeline_name)

    logger.debug("you set the initial context to: %s", pipeline_context_input)

    if context is None:
        context = pypyr.context.Context()
        context.pipeline_name = pipeline_name
        context.working_dir = pypyr.moduleloader.get_working_directory()

    # pipeline loading deliberately outside of try catch. The try catch will
    # try to run a failure-handler from the pipeline, but if the pipeline
    # doesn't exist there is no failure handler that can possibly run so this
    # is very much a fatal stop error.
    pipeline_definition = pipeline_cache.get_pipeline(
        pipeline_name=pipeline_name,
        loader=loader)

    run_pipeline(
        pipeline=pipeline_definition,
        pipeline_context_input=pipeline_context_input,
        context=context,
        parse_input=parse_input,
        groups=groups,
        success_group=success_group,
        failure_group=failure_group
    )