<p>Let FFN able to serialize by boost serialization</p>

<p>Haven't finished yet, there are others parts need to serialize(initialize rules and others).<br>
Besides, I cannot serialize arma::cube, finding a solution</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/516'>https://github.com/mlpack/mlpack/pull/516</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>able to serialize by boost serialization</li>
  <li>able to serialize by boost serialize</li>
  <li>update comments</li>
  <li>adjust format</li>
  <li>adjust format</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/516/files#diff-0">src/mlpack/methods/ann/layer/base_layer.hpp</a>
    (11)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/516/files#diff-1">src/mlpack/methods/ann/layer/bias_layer.hpp</a>
    (30)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/516/files#diff-2">src/mlpack/methods/ann/layer/binary_classification_layer.hpp</a>
    (5)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/516/files#diff-3">src/mlpack/methods/ann/layer/dropout_layer.hpp</a>
    (15)
  </li>
  <li>
    <strong>A</strong>
    <a href="https://github.com/mlpack/mlpack/pull/516/files#diff-4">src/mlpack/methods/ann/layer/empty_layer.hpp</a>
    (76)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/516/files#diff-5">src/mlpack/methods/ann/layer/linear_layer.hpp</a>
    (23)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/516/files#diff-6">src/mlpack/methods/ann/layer/multiclass_classification_layer.hpp</a>
    (5)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/516/files#diff-7">src/mlpack/methods/ann/layer/one_hot_layer.hpp</a>
    (5)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/516/files#diff-8">src/mlpack/methods/ann/layer/recurrent_layer.hpp</a>
    (24)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/516/files#diff-9">src/mlpack/methods/ann/layer/sparse_bias_layer.hpp</a>
    (49)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/516/files#diff-10">src/mlpack/methods/ann/layer/sparse_input_layer.hpp</a>
    (65)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/516/files#diff-11">src/mlpack/methods/ann/layer/sparse_output_layer.hpp</a>
    (65)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/516/files#diff-12">src/mlpack/methods/ann/optimizer/ada_delta.hpp</a>
    (45)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/516/files#diff-13">src/mlpack/methods/ann/optimizer/adam.hpp</a>
    (66)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/516/files#diff-14">src/mlpack/methods/ann/optimizer/rmsprop.hpp</a>
    (61)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/516/files#diff-15">src/mlpack/methods/ann/optimizer/steepest_descent.hpp</a>
    (44)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/mlpack/mlpack/pull/516.patch'>https://github.com/mlpack/mlpack/pull/516.patch</a></li>
  <li><a href='https://github.com/mlpack/mlpack/pull/516.diff'>https://github.com/mlpack/mlpack/pull/516.diff</a></li>
</ul>

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