<p>Refine of pull request <a href="https://github.com/mlpack/mlpack/pull/612" class="issue-link js-issue-link" data-url="https://github.com/mlpack/mlpack/issues/612" data-id="147712617" data-error-text="Failed to load issue title" data-permission-text="Issue title is private">#612</a> </p>

<p>constexpr make sure the variable can initialize at compile time<br>
static make sure the variable will initialize only once</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/614'>https://github.com/mlpack/mlpack/pull/614</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>only initialize variable once</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/614/files#diff-0">src/mlpack/methods/ann/layer/log_softmax_layer.hpp</a>
    (10)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/mlpack/mlpack/pull/614.patch'>https://github.com/mlpack/mlpack/pull/614.patch</a></li>
  <li><a href='https://github.com/mlpack/mlpack/pull/614.diff'>https://github.com/mlpack/mlpack/pull/614.diff</a></li>
</ul>

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