<p>DET class can now work with Arma's sparse matrices. Also:</p>

<ul>
<li>The class is templated, so the matrix type becomes template argument.</li>
<li>Couple of optimizations regarding matrix copying, incl. in dense matrix case.</li>
<li>OpenMP-ification of tree building routine.</li>
<li>Added few test cases with <code>arma::SpMat</code> data.</li>
</ul>

<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/802'>https://github.com/mlpack/mlpack/pull/802</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>- Mac gitignore changes.</li>
  <li>Merge remote-tracking branch &#39;upstream/master&#39;</li>
  <li>- DTree class templated.</li>
  <li>- First successfull builtd.</li>
  <li>- DET changes propagated to tests.</li>
  <li>- DET templating ready and tests passing.</li>
  <li>- More sparse-matrix migration steps.</li>
  <li>- First successfull SpMat build.</li>
  <li>- Sparse DTree finally working.</li>
  <li>- All DET sparsification works.</li>
  <li>- OMP test line removed.</li>
  <li>Merge remote-tracking branch &#39;upstream/master&#39;</li>
  <li>- DTree class templated.</li>
  <li>- First successfull builtd.</li>
  <li>- DET changes propagated to tests.</li>
  <li>- DET templating ready and tests passing.</li>
  <li>- More sparse-matrix migration steps.</li>
  <li>- First successfull SpMat build.</li>
  <li>- Sparse DTree finally working.</li>
  <li>- All DET sparsification works.</li>
  <li>- OMP test line removed.</li>
  <li>Merge remote-tracking branch &#39;origin/feature/det_sparse&#39; into feature/det_sparse</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/802/files#diff-0">.gitignore</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/802/files#diff-1">src/mlpack/core/arma_extend/Mat_extra_bones.hpp</a>
    (9)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/802/files#diff-2">src/mlpack/core/arma_extend/SpMat_extra_bones.hpp</a>
    (8)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/802/files#diff-3">src/mlpack/methods/det/CMakeLists.txt</a>
    (6)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/802/files#diff-4">src/mlpack/methods/det/det_main.cpp</a>
    (5)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/802/files#diff-5">src/mlpack/methods/det/dt_utils.hpp</a>
    (23)
  </li>
  <li>
    <strong>R</strong>
    <a href="https://github.com/mlpack/mlpack/pull/802/files#diff-6">src/mlpack/methods/det/dt_utils_impl.hpp</a>
    (76)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/802/files#diff-7">src/mlpack/methods/det/dtree.hpp</a>
    (105)
  </li>
  <li>
    <strong>R</strong>
    <a href="https://github.com/mlpack/mlpack/pull/802/files#diff-8">src/mlpack/methods/det/dtree_impl.hpp</a>
    (410)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/802/files#diff-9">src/mlpack/tests/det_test.cpp</a>
    (162)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/802/files#diff-10">src/mlpack/tests/serialization_test.cpp</a>
    (15)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/mlpack/mlpack/pull/802.patch'>https://github.com/mlpack/mlpack/pull/802.patch</a></li>
  <li><a href='https://github.com/mlpack/mlpack/pull/802.diff'>https://github.com/mlpack/mlpack/pull/802.diff</a></li>
</ul>

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