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POEM_071.md

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POEM ID: 071
Title: POEM_071 - Change ExecComp to use declare_coloring
authors: robfalck (Rob Falck)
Competing POEMs:
Related POEMs:
Associated implementation PR: #2696

Status:

  • Active
  • Requesting decision
  • Accepted
  • Rejected
  • Integrated

Motivation

The ExecComp in OpenMDAO uses complex-safe functions to provide user-defined calculations within a run script in leiu of writing a custom component.

The option has_diag_partials on ExecComp was added prior to the development of partial derivative coloring to provide a common sparsity pattern for vectorized components.

With the advent of partial coloring, has_diag_partials is no longer needed. Users should be able to expect that ExecComp will determine the sparsity pattern of calculations involved.

Leaving has_diag_partials capability in place.

Option has_diag_partials will remain in place. Leaving the existing complex-step internals in place allows us to complex-step through the ExecComp without require that the entire model be allocated as complex. Since diagonal partials is a common use case, using has_diag_pargtials can provide some performance improvement over computing the coloring dynamically.

Default arguments are passed to declare_coloring

declare_coloring will be called with its default arguments. If the user wishes, they may call declare_coloring on the ExecComp instance explicitly and pass it their desired arguments.