<p><a href="https://github.com/rcurtin" class="user-mention">@rcurtin</a>: this task is slightly different than <a href="https://github.com/mlpack/mlpack/issues/578" class="issue-link js-issue-link" data-url="https://github.com/mlpack/mlpack/issues/578" data-id="141350274" data-error-text="Failed to load issue title" data-permission-text="Issue title is private">#578</a> (it took me a while to realize this). This tasks deals w/ the issue that currently the IP code assumes the nullspace of the A operator is trivial. This is not an easy task IMO, and I'm not sure what the current benefits are (nobody has ever complained about this). </p>

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