<p>In <a href="https://github.com/mlpack/mlpack/pull/747#discussion_r74708120">src/mlpack/methods/neighbor_search/ns_model_impl.hpp</a>:</p>
<pre style='color:#555'>> @@ -249,6 +318,9 @@ void NSModel<SortPolicy>::Serialize(Archive& ar,
> const unsigned int /* version */)
> {
> ar & data::CreateNVP(treeType, "treeType");
> + ar & data::CreateNVP(leafSize, "leafSize");
> + ar & data::CreateNVP(tau, "tau");
> + ar & data::CreateNVP(rho, "rho");
</pre>
<p>I hate to always be talking about reverse compatibility, but this is reverse-incompatible, since tau, rho, and leafSize aren't part of the previous saved models. So the thing to do is to uncomment the <code>version</code> parameter, and use <code>version == 0</code> to assume that leafSize, tau, and rho aren't available (and set them to defaults), and <code>version == 1</code> to assume that leafSize, tau, and rho are available.</p>
<p>You'll need to then set the serialization version. For <code>LSHSearch</code>, that's done like this:</p>
<pre><code>
//! Set the serialization version of the LSHSearch class.
BOOST_TEMPLATE_CLASS_VERSION(template<typename SortPolicy>,
mlpack::neighbor::LSHSearch<SortPolicy>, 1);
</code></pre>
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