<p>Use work around to fix the compile time error of vc2015(this fix could past the unit test)</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/453'>https://github.com/mlpack/mlpack/pull/453</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>improve speed of SparseAutoencoder and make it more flexible</li>
  <li>fix example of sparse_autoencoder</li>
  <li>reduce the cost of construction and destruction of the layers</li>
  <li>refine the example; the size of the basis should not too big</li>
  <li>refine the example</li>
  <li>refine the example</li>
  <li>can use Greedy parameters to determine the Gradient should omit some repeated calculation or not</li>
  <li>add test cases of modified SparseAutoEncoder</li>
  <li>add test</li>
  <li>change the name of test suite to avoid definition confliction</li>
  <li>change boost test header to avoid build issue</li>
  <li>use work around to fix the compile time error of cnn(internal error occur)</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>A</strong>
    <a href="https://github.com/mlpack/mlpack/pull/453/files#diff-0">src/mlpack/methods/ann/activation_functions/lazy_logistic_function.hpp</a>
    (90)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/453/files#diff-1">src/mlpack/methods/ann/cnn.hpp</a>
    (30)
  </li>
  <li>
    <strong>A</strong>
    <a href="https://github.com/mlpack/mlpack/pull/453/files#diff-2">src/mlpack/methods/ann/sparse_autoencoder_function.hpp</a>
    (407)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/453/files#diff-3">src/mlpack/tests/CMakeLists.txt</a>
    (1)
  </li>
  <li>
    <strong>A</strong>
    <a href="https://github.com/mlpack/mlpack/pull/453/files#diff-4">src/mlpack/tests/sparse_autoencoder_test_2.cpp</a>
    (278)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/mlpack/mlpack/pull/453.patch'>https://github.com/mlpack/mlpack/pull/453.patch</a></li>
  <li><a href='https://github.com/mlpack/mlpack/pull/453.diff'>https://github.com/mlpack/mlpack/pull/453.diff</a></li>
</ul>

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