Implement ptycho-ADMM

[carterbox]

Purpose

Implements a ptychography solver using ADMM and fixes the testing infrastructure surrounding ptychography solvers.

Approach

The ADMM framework provides regularization when solving a series of subproblems so that they do not stray too far from the solutions of the other subproblems. This supposedly improves convergence because each subproblem doesn't cause the solution to diverge too much from the solution from the other subproblems.

Pre-Merge Checklists

Submitter

• [x] Write a helpfully descriptive pull request title.
• [x] Organize changes into logically grouped commits with descriptive commit messages.
• [x] Document all new functions.
• [ ] Write tests for new functions or explain why they are not needed.
• [ ] Build the documentation successfully
• [x] Use yapf to format python code.

Reviewer

• [ ] Actually read all of the code.
• [ ] Run the new code yourself.
• [ ] Write a summary of the changes as you understand them.
• [ ] Thank the submitter.

[pep8speaks]

Hello @carterbox! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers:

Comment last updated at 2020-04-17 18:25:57 UTC