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POEM_027.md

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POEM ID: 027
Title: Approximation flag and state tracking
authors: johnjasa (John Jasa)
Competing POEMs: N/A
Related POEMs: N/A
Associated implementation PR: #1492

Status:

  • Active
  • Requesting decision
  • Accepted
  • Rejected
  • Integrated

Motivation

Just as a user may want to know when a system is under complex step, it's helpful to know when the system is under approximation of any kind. This would allow users to add logic in their compute() statements depending on if the system is under approximation or not.

Description

The changes required to the codebase are relatively straightforward and have been implemented in a PR to OpenMDAO already.

This PR adds a flag for all systems that is True when the system is under approximation, and False when it is not. Additionally, this PR adds iter_count_without_approx to systems, which counts the number of times compute() has been called while not counting any compute() calls that have been called as part of an approximation. This allows the user to add logic to a system based on the number of analysis calls to it regardless of the approximation scheme used.

I've added a test for the counting and the relevant docstrings. Feel free to suggest any syntax or docs as needed.