no_recursion

Do not recur over admissible DAGs for a given model ensemble

Specification

• Alias: None

• Arguments: None

Description

This (default) option supports restriction to the peer DAG (all control variates target the same truth model) in the ACV approach (approximate_control_variate and [GGEJ20]) and restriction to a hierarchical DAG (each approximation node points to the next approximation of higher fidelity/resolution, ending with the truth model at the root node) for weighted MLMC (weighted) and MFMC (multifidelity_sampling).

Note that the omission of the search_model_graphs block defaults to no searching over either DAGs or model subsets. The no_recursion option exists in order to enable search over the latter while suppressing search over the former, as shown below.

Examples

method,
    model_pointer = 'ENSEMBLE'
    approximate_control_variate acv_mf
      pilot_samples = 25 seed = 8674132
      search_model_graphs
        no_recursion
        model_selection
      max_function_evaluations = 500