<p>I added move constructor and move assignment on most of the layers in the pull request of <a href="https://github.com/mlpack/mlpack/pull/451" class="issue-link js-issue-link" data-url="https://github.com/mlpack/mlpack/issues/451" data-id="107450114" data-error-text="Failed to load issue title" data-permission-text="Issue title is private">#451</a>.<br>
I also change the reference of the output layer of FFN to non-reference type, it would be very easy to implement move constructor and move assignment for the FFN after <a href="https://github.com/mlpack/mlpack/pull/451" class="issue-link js-issue-link" data-url="https://github.com/mlpack/mlpack/issues/451" data-id="107450114" data-error-text="Failed to load issue title" data-permission-text="Issue title is private">#451</a> is merged.</p>

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