<p>In <a href="https://github.com/mlpack/mlpack/pull/747#discussion_r75038002">src/mlpack/methods/neighbor_search/knn_main.cpp</a>:</p>
<pre style='color:#555'>> @@ -78,6 +82,9 @@ PARAM_FLAG("single_mode", "If true, single-tree search is used (as opposed to "
> "dual-tree search).", "S");
> PARAM_DOUBLE_IN("epsilon", "If specified, will do approximate nearest neighbor "
> "search with given relative error.", "e", 0);
> +PARAM_STRING_IN("effective_error", "If specified, will compare the results "
> + "against the provided distances file, and will print the average relative "
> + "error.", "E", "");
</pre>
<p><a href="https://github.com/rcurtin" class="user-mention">@rcurtin</a> , yes I agree. I added 2 new command line options in <a href="https://github.com/mlpack/mlpack/pull/747/commits/92155154bc8721055702ae3d22c33542f2f07a61" class="commit-link"><tt>9215515</tt></a> and <a href="https://github.com/mlpack/mlpack/pull/747/commits/3e79d273545cb5d5694f6c8e7370a0dbbd95e5e6" class="commit-link"><tt>3e79d27</tt></a>:</p>
<pre><code>PARAM_STRING_IN("true_distances_file", "File of true distances to compute "
"the effective error (average relative error) (it is printed when -v is "
"specified).", "D", "");
PARAM_STRING_IN("true_neighbors_file", "File of true neighbors to compute the "
"recall (it is printed when -v is specified).", "T", "");
</code></pre>
<p>So "-T" will print the <em>Recall</em>, similar to "-t" for <em>LSH</em>.</p>
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<script type="application/json" data-scope="inboxmarkup">{"api_version":"1.0","publisher":{"api_key":"05dde50f1d1a384dd78767c55493e4bb","name":"GitHub"},"entity":{"external_key":"github/mlpack/mlpack","title":"mlpack/mlpack","subtitle":"GitHub repository","main_image_url":"https://cloud.githubusercontent.com/assets/143418/17495839/a5054eac-5d88-11e6-95fc-7290892c7bb5.png","avatar_image_url":"https://cloud.githubusercontent.com/assets/143418/15842166/7c72db34-2c0b-11e6-9aed-b52498112777.png","action":{"name":"Open in GitHub","url":"https://github.com/mlpack/mlpack"}},"updates":{"snippets":[{"icon":"PERSON","message":"@MarcosPividori in #747: @rcurtin , yes I agree. I added 2 new command line options in https://github.com/mlpack/mlpack/pull/747/commits/92155154bc8721055702ae3d22c33542f2f07a61 and https://github.com/mlpack/mlpack/pull/747/commits/3e79d273545cb5d5694f6c8e7370a0dbbd95e5e6:\r\n```\r\nPARAM_STRING_IN(\"true_distances_file\", \"File of true distances to compute \"\r\n \"the effective error (average relative error) (it is printed when -v is \"\r\n \"specified).\", \"D\", \"\");\r\nPARAM_STRING_IN(\"true_neighbors_file\", \"File of true neighbors to compute the \"\r\n \"recall (it is printed when -v is specified).\", \"T\", \"\");\r\n```\r\nSo \"-T\" will print the *Recall*, similar to \"-t\" for *LSH*."}],"action":{"name":"View Pull Request","url":"https://github.com/mlpack/mlpack/pull/747/files/fe090ee13c7cad79e2b7eb8b6690628ba3ead1ed#r75038002"}}}</script>