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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US">
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<title>Vowpal Wabbit: VW::LEARNER::learner Class Reference</title>
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<div id="projectname">Vowpal Wabbit
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<ul>
<li class="navelem"><a class="el" href="namespaceVW.html">VW</a></li><li class="navelem"><a class="el" href="namespaceVW_1_1LEARNER.html">LEARNER</a></li><li class="navelem"><a class="el" href="classVW_1_1LEARNER_1_1learner.html">learner</a></li> </ul>
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</div><!-- top -->
<div class="header">
<div class="summary">
<a href="#pub-methods">Public Member Functions</a> |
<a href="#pub-attribs">Public Attributes</a> |
<a href="#friends">Friends</a> |
<a href="classVW_1_1LEARNER_1_1learner-members.html">List of all members</a> </div>
<div class="headertitle"><div class="title">VW::LEARNER::learner Class Reference<span class="mlabels"><span class="mlabel">final</span></span></div></div>
</div><!--header-->
<div class="contents">
<p>Defines the interface for a learning algorithm.
<a href="classVW_1_1LEARNER_1_1learner.html#details">More...</a></p>
<p><code>#include <learner.h></code></p>
<div class="dynheader">
Inheritance diagram for VW::LEARNER::learner:</div>
<div class="dyncontent">
<div class="center">
<img src="classVW_1_1LEARNER_1_1learner.png" alt=""/>
</div></div>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="pub-methods" name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:a8689aafb144a06f893c1258ca4a81a6b"><td class="memItemLeft" align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a8689aafb144a06f893c1258ca4a81a6b">get_internal_type_erased_data_pointer_test_use_only</a> ()</td></tr>
<tr class="separator:a8689aafb144a06f893c1258ca4a81a6b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a2a45dfc5e4fba7d6f7c551a5acc5f060"><td class="memItemLeft" align="right" valign="top">std::shared_ptr< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a2a45dfc5e4fba7d6f7c551a5acc5f060">get_internal_type_erased_data_pointer_test_use_only_shared</a> ()</td></tr>
<tr class="separator:a2a45dfc5e4fba7d6f7c551a5acc5f060"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a2f62255afa3e46a52687fee0fb602d3f"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a2f62255afa3e46a52687fee0fb602d3f">set_internal_type_erased_data_pointer_does_not_override_funcs</a> (std::shared_ptr< void > data)</td></tr>
<tr class="separator:a2f62255afa3e46a52687fee0fb602d3f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad68a7371f4e7812b72eaf12b3f286755"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#ad68a7371f4e7812b72eaf12b3f286755">learn</a> (<a class="el" href="classVW_1_1polymorphic__ex.html">polymorphic_ex</a> ec, size_t i=0)</td></tr>
<tr class="memdesc:ad68a7371f4e7812b72eaf12b3f286755"><td class="mdescLeft"> </td><td class="mdescRight">Will update the model according to the labels and examples supplied. <a href="classVW_1_1LEARNER_1_1learner.html#ad68a7371f4e7812b72eaf12b3f286755">More...</a><br /></td></tr>
<tr class="separator:ad68a7371f4e7812b72eaf12b3f286755"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ae94c7331023cbba980b140b26e5e868b"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#ae94c7331023cbba980b140b26e5e868b">predict</a> (<a class="el" href="classVW_1_1polymorphic__ex.html">polymorphic_ex</a> ec, size_t i=0)</td></tr>
<tr class="memdesc:ae94c7331023cbba980b140b26e5e868b"><td class="mdescLeft"> </td><td class="mdescRight">Make a prediction for the given example. <a href="classVW_1_1LEARNER_1_1learner.html#ae94c7331023cbba980b140b26e5e868b">More...</a><br /></td></tr>
<tr class="separator:ae94c7331023cbba980b140b26e5e868b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a33eb8de1c5b9ac18187c83c916774847"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a33eb8de1c5b9ac18187c83c916774847">multipredict</a> (<a class="el" href="classVW_1_1polymorphic__ex.html">polymorphic_ex</a> ec, size_t lo, size_t count, <a class="el" href="classVW_1_1polyprediction.html">polyprediction</a> *pred, bool finalize_predictions)</td></tr>
<tr class="separator:a33eb8de1c5b9ac18187c83c916774847"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4c99fcdb04f6dc50790723afefac09ef"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a4c99fcdb04f6dc50790723afefac09ef">update</a> (<a class="el" href="classVW_1_1polymorphic__ex.html">polymorphic_ex</a> ec, size_t i=0)</td></tr>
<tr class="separator:a4c99fcdb04f6dc50790723afefac09ef"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4e7dff35021d473f245f1929c462aec9"><td class="memItemLeft" align="right" valign="top">float </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a4e7dff35021d473f245f1929c462aec9">sensitivity</a> (<a class="el" href="classVW_1_1example.html">example</a> &ec, size_t i=0)</td></tr>
<tr class="separator:a4e7dff35021d473f245f1929c462aec9"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:acf0c61983877454d4ffc444137f15cf8"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#acf0c61983877454d4ffc444137f15cf8">save_load</a> (<a class="el" href="classVW_1_1io__buf.html">io_buf</a> &io, const bool read, const bool text)</td></tr>
<tr class="separator:acf0c61983877454d4ffc444137f15cf8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ada0744b233aa31e7076a7d9a2e3e4f17"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#ada0744b233aa31e7076a7d9a2e3e4f17">pre_save_load</a> (<a class="el" href="classVW_1_1workspace.html">VW::workspace</a> &all)</td></tr>
<tr class="separator:ada0744b233aa31e7076a7d9a2e3e4f17"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a160b0b410dfc7a4cd00f3a8a63c36ea9"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a160b0b410dfc7a4cd00f3a8a63c36ea9">persist_metrics</a> (<a class="el" href="classVW_1_1metric__sink.html">metric_sink</a> &metrics)</td></tr>
<tr class="separator:a160b0b410dfc7a4cd00f3a8a63c36ea9"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4c3fe6c9bff4d7efda59ceb77050dfde"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a4c3fe6c9bff4d7efda59ceb77050dfde">finish</a> ()</td></tr>
<tr class="separator:a4c3fe6c9bff4d7efda59ceb77050dfde"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:abfe839095e369a4d791b05de3aa43cb9"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#abfe839095e369a4d791b05de3aa43cb9">end_pass</a> ()</td></tr>
<tr class="separator:abfe839095e369a4d791b05de3aa43cb9"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a737ed5975cf621d2bc2d18d44384fb1f"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a737ed5975cf621d2bc2d18d44384fb1f">end_examples</a> ()</td></tr>
<tr class="separator:a737ed5975cf621d2bc2d18d44384fb1f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aadeeb24cbd0e3d1be25fb01b24d9a6e3"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#aadeeb24cbd0e3d1be25fb01b24d9a6e3">init_driver</a> ()</td></tr>
<tr class="separator:aadeeb24cbd0e3d1be25fb01b24d9a6e3"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a278e29d5ef7b16739e81f35762c9d2e2"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a278e29d5ef7b16739e81f35762c9d2e2">finish_example</a> (<a class="el" href="classVW_1_1workspace.html">VW::workspace</a> &all, <a class="el" href="classVW_1_1polymorphic__ex.html">polymorphic_ex</a> ec)</td></tr>
<tr class="separator:a278e29d5ef7b16739e81f35762c9d2e2"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a38f1dd3d2f9a7d5fbcec2db81b193c7b"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a38f1dd3d2f9a7d5fbcec2db81b193c7b">update_stats</a> (const <a class="el" href="classVW_1_1workspace.html">VW::workspace</a> &all, <a class="el" href="classVW_1_1shared__data.html">VW::shared_data</a> &sd, const <a class="el" href="classVW_1_1polymorphic__ex.html">polymorphic_ex</a> ec, <a class="el" href="classVW_1_1io_1_1logger.html">VW::io::logger</a> &logger)</td></tr>
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<tr class="memitem:a95598e942a7ec90ad48754d319250515"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a95598e942a7ec90ad48754d319250515">update_stats</a> (<a class="el" href="classVW_1_1workspace.html">VW::workspace</a> &all, const <a class="el" href="classVW_1_1polymorphic__ex.html">polymorphic_ex</a> ec)</td></tr>
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<tr class="memitem:a19b315ee5cd81e3a73f79552d6d56eef"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a19b315ee5cd81e3a73f79552d6d56eef">output_example_prediction</a> (<a class="el" href="classVW_1_1workspace.html">VW::workspace</a> &all, const <a class="el" href="classVW_1_1polymorphic__ex.html">polymorphic_ex</a> ec, <a class="el" href="classVW_1_1io_1_1logger.html">VW::io::logger</a> &logger)</td></tr>
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<tr class="memitem:aaba417ce2b0beea9eb57b7800841da92"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#aaba417ce2b0beea9eb57b7800841da92">output_example_prediction</a> (<a class="el" href="classVW_1_1workspace.html">VW::workspace</a> &all, const <a class="el" href="classVW_1_1polymorphic__ex.html">polymorphic_ex</a> ec)</td></tr>
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<tr class="memitem:a2d35f03d82f72657b7e923a17ca4321f"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a2d35f03d82f72657b7e923a17ca4321f">print_update</a> (<a class="el" href="classVW_1_1workspace.html">VW::workspace</a> &all, <a class="el" href="classVW_1_1shared__data.html">VW::shared_data</a> &sd, const <a class="el" href="classVW_1_1polymorphic__ex.html">polymorphic_ex</a> ec, <a class="el" href="classVW_1_1io_1_1logger.html">VW::io::logger</a> &logger)</td></tr>
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<tr class="memitem:ac734abeefef8e659d505b8782c296289"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#ac734abeefef8e659d505b8782c296289">print_update</a> (<a class="el" href="classVW_1_1workspace.html">VW::workspace</a> &all, const <a class="el" href="classVW_1_1polymorphic__ex.html">polymorphic_ex</a> ec)</td></tr>
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<tr class="memitem:a14d1e228ffd7eca01ae3acf0a987631b"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a14d1e228ffd7eca01ae3acf0a987631b">cleanup_example</a> (<a class="el" href="classVW_1_1polymorphic__ex.html">polymorphic_ex</a> ec)</td></tr>
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<tr class="memitem:a6c5d05f7df72ee43bd2f4bea5ea873e9"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a6c5d05f7df72ee43bd2f4bea5ea873e9">get_enabled_learners</a> (std::vector< std::string > &enabled_learners) const</td></tr>
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<tr class="memitem:a3ece1f72e91ef25d1f7174190c350db8"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classVW_1_1LEARNER_1_1learner.html">learner</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a3ece1f72e91ef25d1f7174190c350db8">get_learner_by_name_prefix</a> (const std::string &learner_name)</td></tr>
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<tr class="memitem:ac961f10dd92dd544f469e0425b3dc58f"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#ac961f10dd92dd544f469e0425b3dc58f">merge</a> (const std::vector< float > &per_model_weighting, const std::vector< const <a class="el" href="classVW_1_1workspace.html">VW::workspace</a> * > &all_workspaces, const std::vector< const <a class="el" href="classVW_1_1LEARNER_1_1learner.html">learner</a> * > &all_learners, <a class="el" href="classVW_1_1workspace.html">VW::workspace</a> &output_workspace, <a class="el" href="classVW_1_1LEARNER_1_1learner.html">learner</a> &output_learner)</td></tr>
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<tr class="memitem:aeb7ad507668f6337b3efc911d4b643d9"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#aeb7ad507668f6337b3efc911d4b643d9">add</a> (const <a class="el" href="classVW_1_1workspace.html">VW::workspace</a> &base_ws, const <a class="el" href="classVW_1_1workspace.html">VW::workspace</a> &delta_ws, const <a class="el" href="classVW_1_1LEARNER_1_1learner.html">learner</a> *base_l, const <a class="el" href="classVW_1_1LEARNER_1_1learner.html">learner</a> *delta_l, <a class="el" href="classVW_1_1workspace.html">VW::workspace</a> &output_ws, <a class="el" href="classVW_1_1LEARNER_1_1learner.html">learner</a> *output_l)</td></tr>
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<tr class="memitem:a2a5ac80e27b4495faf34aa3fd4a30041"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a2a5ac80e27b4495faf34aa3fd4a30041">subtract</a> (const <a class="el" href="classVW_1_1workspace.html">VW::workspace</a> &ws1, const <a class="el" href="classVW_1_1workspace.html">VW::workspace</a> &ws2, const <a class="el" href="classVW_1_1LEARNER_1_1learner.html">learner</a> *l1, const <a class="el" href="classVW_1_1LEARNER_1_1learner.html">learner</a> *l2, <a class="el" href="classVW_1_1workspace.html">VW::workspace</a> &output_ws, <a class="el" href="classVW_1_1LEARNER_1_1learner.html">learner</a> *output_l)</td></tr>
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<tr class="memitem:a52e3802a514dc08c19151916105f7959"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a52e3802a514dc08c19151916105f7959">has_legacy_finish</a> () const</td></tr>
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<tr class="memitem:a41ccee287a8597a9b6d66faa8d55e58e"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a41ccee287a8597a9b6d66faa8d55e58e">has_update_stats</a> () const</td></tr>
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<tr class="memitem:a7540a141749b8e6047dcfb354ab4ad64"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a7540a141749b8e6047dcfb354ab4ad64">has_print_update</a> () const</td></tr>
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<tr class="memitem:a507711406fc4cf638258200fb9f3aa71"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a507711406fc4cf638258200fb9f3aa71">has_output_example_prediction</a> () const</td></tr>
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<tr class="memitem:ac9b952cb796765e8b1b68e02ad6ee290"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#ac9b952cb796765e8b1b68e02ad6ee290">has_cleanup_example</a> () const</td></tr>
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<tr class="memitem:a670b011645f17bb9457c5ac3c4c3448a"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a670b011645f17bb9457c5ac3c4c3448a">has_merge</a> () const</td></tr>
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<tr class="memitem:a6653e041adecf3c3a3d3cb542401f65a"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a6653e041adecf3c3a3d3cb542401f65a">has_add</a> () const</td></tr>
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<tr class="memitem:a2cf2307c392eac2cf583dba46b272806"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a2cf2307c392eac2cf583dba46b272806">has_subtract</a> () const</td></tr>
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<tr class="memitem:a6865ad2a796967da4b4383c0ea77d701"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceVW.html#a4f76045a06b3efe3c5c612b777b6c836">prediction_type_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a6865ad2a796967da4b4383c0ea77d701">get_output_prediction_type</a> () const</td></tr>
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<tr class="memitem:a86c17812a022a741e05939777a260d50"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceVW.html#a4f76045a06b3efe3c5c612b777b6c836">prediction_type_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a86c17812a022a741e05939777a260d50">get_input_prediction_type</a> () const</td></tr>
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<tr class="memitem:a5127aab5efdd3605fb0922b52766bd67"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceVW.html#a41c81f994e2400fabf138c9f2b3d78e5">label_type_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a5127aab5efdd3605fb0922b52766bd67">get_output_label_type</a> () const</td></tr>
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<tr class="memitem:a77f4d6f17d3ec3fdf97040043ad93bb2"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceVW.html#a41c81f994e2400fabf138c9f2b3d78e5">label_type_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a77f4d6f17d3ec3fdf97040043ad93bb2">get_input_label_type</a> () const</td></tr>
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<tr class="memitem:a71de9ffa6723bfaf765f5ad668a1fad8"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a71de9ffa6723bfaf765f5ad668a1fad8">is_multiline</a> () const</td></tr>
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<tr class="memitem:ae87e4fc47763c6e1e3d7a99234358098"><td class="memItemLeft" align="right" valign="top">const std::string & </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#ae87e4fc47763c6e1e3d7a99234358098">get_name</a> () const</td></tr>
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<tr class="memitem:aba0bdc766b01a90f643e56e3e0111ff5"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="classVW_1_1LEARNER_1_1learner.html">learner</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#aba0bdc766b01a90f643e56e3e0111ff5">get_base_learner</a> () const</td></tr>
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<tr class="memitem:a27e883cfc6982510b61f0d42ffb971dd"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classVW_1_1LEARNER_1_1learner.html">learner</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a27e883cfc6982510b61f0d42ffb971dd">get_base_learner</a> ()</td></tr>
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<tr class="memitem:a0ca8b7ebe14fce901fc8bdb711b6e776"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a0ca8b7ebe14fce901fc8bdb711b6e776">learner_defines_own_save_load</a> ()</td></tr>
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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="pub-attribs" name="pub-attribs"></a>
Public Attributes</h2></td></tr>
<tr class="memitem:ad9da01bb27cfa99790815600f7d78d7d"><td class="memItemLeft" align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#ad9da01bb27cfa99790815600f7d78d7d">feature_width</a> = 1</td></tr>
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<tr class="memitem:a154a6229cdc62236729ea6d9934b4878"><td class="memItemLeft" align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a154a6229cdc62236729ea6d9934b4878">feature_width_below</a> = 1</td></tr>
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<tr class="memitem:a6122b633e0580c8cd3b7cfc6d2b40965"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a6122b633e0580c8cd3b7cfc6d2b40965">learn_returns_prediction</a> = false</td></tr>
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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="friends" name="friends"></a>
Friends</h2></td></tr>
<tr class="memitem:a59a4af51e0c6c05e4162f1f6ab47eba4"><td class="memTemplParams" colspan="2">template<class FluentBuilderT , class DataT , class ExampleT > </td></tr>
<tr class="memitem:a59a4af51e0c6c05e4162f1f6ab47eba4"><td class="memTemplItemLeft" align="right" valign="top">class </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a59a4af51e0c6c05e4162f1f6ab47eba4">common_learner_builder</a></td></tr>
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<tr class="memitem:a13e1b4d4dec5011da7792e68d88882f1"><td class="memTemplParams" colspan="2">template<class DataT , class ExampleT > </td></tr>
<tr class="memitem:a13e1b4d4dec5011da7792e68d88882f1"><td class="memTemplItemLeft" align="right" valign="top">class </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a13e1b4d4dec5011da7792e68d88882f1">bottom_learner_builder</a></td></tr>
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<tr class="memitem:a4f2925133ca561f1266341bd9c1a96e1"><td class="memTemplParams" colspan="2">template<class DataT , class ExampleT > </td></tr>
<tr class="memitem:a4f2925133ca561f1266341bd9c1a96e1"><td class="memTemplItemLeft" align="right" valign="top">class </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a4f2925133ca561f1266341bd9c1a96e1">reduction_learner_builder</a></td></tr>
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<tr class="memitem:a55e2c380d79b785ffd964401cddcc8bd"><td class="memTemplParams" colspan="2">template<class ExampleT > </td></tr>
<tr class="memitem:a55e2c380d79b785ffd964401cddcc8bd"><td class="memTemplItemLeft" align="right" valign="top">class </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classVW_1_1LEARNER_1_1learner.html#a55e2c380d79b785ffd964401cddcc8bd">reduction_no_data_learner_builder</a></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p >Defines the interface for a learning algorithm. </p>
<p ><a class="el" href="namespaceVW.html">VW</a> has two types of learners: reduction learners and bottom learners. The same learner class is used to implement both. A reduction stack is created as a chain of learners, starting from a bottom learner at the bottom of the stack. Each learner after it is a reduction learner and holds a shared_ptr to its base, the learner immediately below it in the stack. The final <a class="el" href="namespaceVW.html">VW</a> workspace holds a shared_ptr to the topmost learner. The difference between a reduction and a bottom learner is that a reduction will recursively call its base, whereas a bottom learner has no base and will simply return its result.</p>
<p >The learner class is not meant to be inherited from. Instead, it implements a sort of virtual inheritance via std::function objects. Each type of learner can have its own data object that stores the learner's internal state. When a learner is created, the function objects are bound to the data object, and the data object is stored in a std::shared_ptr<void>. The end result is that the data type representing the learner's state is type-erased, thus allowing for arbitrary learner types to be implemented by the same learner class.</p>
<p >The learner class itself has a private constructor. Learners should be created only through the make_reduction_learner and make_bottom_learner functions and their associated learner builder template classes. The templates enforce consistency of types at compile time, before types-erasure occurs to make the acutal learner object. </p>
</div><h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname">void VW::LEARNER::learner::add </td>
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<td class="memname">void VW::LEARNER::learner::cleanup_example </td>
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<td class="memname">void VW::LEARNER::learner::finish_example </td>
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<h2 class="memtitle"><span class="permalink"><a href="#a6c5d05f7df72ee43bd2f4bea5ea873e9">◆ </a></span>get_enabled_learners()</h2>
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<td class="memname">void VW::LEARNER::learner::get_enabled_learners </td>
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<h2 class="memtitle"><span class="permalink"><a href="#a77f4d6f17d3ec3fdf97040043ad93bb2">◆ </a></span>get_input_label_type()</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a86c17812a022a741e05939777a260d50">◆ </a></span>get_input_prediction_type()</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a8689aafb144a06f893c1258ca4a81a6b">◆ </a></span>get_internal_type_erased_data_pointer_test_use_only()</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a2a45dfc5e4fba7d6f7c551a5acc5f060">◆ </a></span>get_internal_type_erased_data_pointer_test_use_only_shared()</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a3ece1f72e91ef25d1f7174190c350db8">◆ </a></span>get_learner_by_name_prefix()</h2>
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<td class="memname"><a class="el" href="classVW_1_1LEARNER_1_1learner.html">learner</a> * VW::LEARNER::learner::get_learner_by_name_prefix </td>
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<h2 class="memtitle"><span class="permalink"><a href="#ae87e4fc47763c6e1e3d7a99234358098">◆ </a></span>get_name()</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a5127aab5efdd3605fb0922b52766bd67">◆ </a></span>get_output_label_type()</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a6653e041adecf3c3a3d3cb542401f65a">◆ </a></span>has_add()</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a52e3802a514dc08c19151916105f7959">◆ </a></span>has_legacy_finish()</h2>
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<td class="memname">bool VW::LEARNER::learner::has_print_update </td>
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<td class="memname">void VW::LEARNER::learner::learn </td>
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<p>Will update the model according to the labels and examples supplied. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">ec</td><td>The <a class="el" href="example_8h.html#ad8bc4e4e4b50871a4a048c3a6b6e5309">example</a> object or <a class="el" href="namespaceVW.html#a1dd7b95816f635bc6a5906d2b566c856">multi_ex</a> to be operated on. This object <b>must</b> have a valid label set for every <a class="el" href="example_8h.html#ad8bc4e4e4b50871a4a048c3a6b6e5309">example</a> in the field <a class="el" href="classVW_1_1example.html#adfcc771a9e46a65130c9dcf8b18870e6">example::l</a> that corresponds to the type this learner expects. </td></tr>
<tr><td class="paramname">i</td><td>This is the offset used for the feature_width in this call. If using multiple regressors/learners you can feature_width_below this value for each call. </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>While some learner may fill the <a class="el" href="classVW_1_1example.html#a9302a52e74bafd839a213cbba89cfe4a">example::pred</a>, this is not guaranteed and is undefined behavior if accessed. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a0ca8b7ebe14fce901fc8bdb711b6e776">◆ </a></span>learner_defines_own_save_load()</h2>
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<td class="memname">void VW::LEARNER::learner::merge </td>
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<td class="memname">void VW::LEARNER::learner::multipredict </td>
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