<p>Hi so all the tests have passed on my system. Solution to <a href="https://github.com/mlpack/mlpack/issues/540" class="issue-link js-issue-link" data-url="https://github.com/mlpack/mlpack/issues/540" data-id="137890558" data-error-text="Failed to load issue title" data-permission-text="Issue title is private">#540</a></p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>&nbsp;&nbsp;<a href='https://github.com/mlpack/mlpack/pull/548'>https://github.com/mlpack/mlpack/pull/548</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>Added HardTanH Layer and its tests</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>A</strong>
    <a href="https://github.com/mlpack/mlpack/pull/548/files#diff-0">src/mlpack/methods/ann/layer/hard_tanh_layer.hpp</a>
    (254)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/548/files#diff-1">src/mlpack/tests/activation_functions_test.cpp</a>
    (74)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/mlpack/mlpack/pull/548.patch'>https://github.com/mlpack/mlpack/pull/548.patch</a></li>
  <li><a href='https://github.com/mlpack/mlpack/pull/548.diff'>https://github.com/mlpack/mlpack/pull/548.diff</a></li>
</ul>

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