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<div class="textblock"><code>#include "<a class="el" href="best__constant_8h_source.html">best_constant.h</a>"</code><br />
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Functions</h2></td></tr>
<tr class="memitem:a44d91dc1b44ba8b83806bae10cce8fb7"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="best__constant_8cc.html#a44d91dc1b44ba8b83806bae10cce8fb7">get_best_constant</a> (<a class="el" href="structvw.html">vw</a> &all, float &best_constant, float &best_constant_loss)</td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#a44d91dc1b44ba8b83806bae10cce8fb7">◆ </a></span>get_best_constant()</h2>
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<td class="memname">bool get_best_constant </td>
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<td class="paramname"><em>all</em>, </td>
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<td class="paramtype">float & </td>
<td class="paramname"><em>best_constant</em>, </td>
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<td class="paramtype">float & </td>
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<p class="definition">Definition at line <a class="el" href="best__constant_8cc_source.html#l00003">3</a> of file <a class="el" href="best__constant_8cc_source.html">best_constant.cc</a>.</p>
<p class="reference">References <a class="el" href="global__data_8h_source.html#l00171">shared_data::first_observed_label</a>, <a class="el" href="options_8h_source.html#l00120">VW::config::options_i::get_typed_option()</a>, <a class="el" href="classloss__function.html#a46f4d6f9bb6d90efdf4b0ffc5fcbba9e">loss_function::getLoss()</a>, <a class="el" href="classloss__function.html#a7a9fc3e21b0331c6cafb0a81ff7966d8">loss_function::getType()</a>, <a class="el" href="global__data_8h_source.html#l00170">shared_data::is_more_than_two_labels_observed</a>, <a class="el" href="global__data_8h_source.html#l00523">vw::loss</a>, <a class="el" href="global__data_8h_source.html#l00428">vw::options</a>, <a class="el" href="global__data_8h_source.html#l00375">vw::sd</a>, <a class="el" href="global__data_8h_source.html#l00172">shared_data::second_observed_label</a>, <a class="el" href="structVW_1_1config_1_1options__i.html#ab5171ac33158fca4580d3f0658c4929e">VW::config::options_i::was_supplied()</a>, <a class="el" href="global__data_8h_source.html#l00141">shared_data::weighted_labeled_examples</a>, and <a class="el" href="global__data_8h_source.html#l00144">shared_data::weighted_labels</a>.</p>
<p class="reference">Referenced by <a class="el" href="best__constant_8h_source.html#l00005">count_label()</a>, and <a class="el" href="parse__args_8cc_source.html#l01823">VW::finish()</a>.</p>
<div class="fragment"><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> {</div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span>  <span class="keywordflow">if</span> (all.<a class="code" href="structvw.html#aada16c220b8d3eaf62aaee86168dde5e">sd</a>-><a class="code" href="structshared__data.html#acdead5f80e8283d6600d35a837cd0b97">first_observed_label</a> == FLT_MAX || <span class="comment">// no non-test labels observed or function was never called</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span>  (all.<a class="code" href="structvw.html#a6d53e7b5144384bf3e68fd8d7566a39a">loss</a> == <span class="keyword">nullptr</span>) || (all.<a class="code" href="structvw.html#aada16c220b8d3eaf62aaee86168dde5e">sd</a> == <span class="keyword">nullptr</span>))</div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span>  <span class="keywordtype">float</span> label1 = all.<a class="code" href="structvw.html#aada16c220b8d3eaf62aaee86168dde5e">sd</a>-><a class="code" href="structshared__data.html#acdead5f80e8283d6600d35a837cd0b97">first_observed_label</a>; <span class="comment">// observed labels might be inside [sd->Min_label, sd->Max_label], so</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span>  <span class="comment">// can't use Min/Max</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span>  <span class="keywordtype">float</span> label2 = (all.<a class="code" href="structvw.html#aada16c220b8d3eaf62aaee86168dde5e">sd</a>-><a class="code" href="structshared__data.html#aa8665db15ad6cea576c387bfc1236e4a">second_observed_label</a> == FLT_MAX)</div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span>  ? 0</div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span>  : all.<a class="code" href="structvw.html#aada16c220b8d3eaf62aaee86168dde5e">sd</a>-><a class="code" href="structshared__data.html#aa8665db15ad6cea576c387bfc1236e4a">second_observed_label</a>; <span class="comment">// if only one label observed, second might be 0</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span>  if (label1 > label2)</div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  {</div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  <span class="keywordtype">float</span> tmp = label1;</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  label1 = label2;</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  label2 = tmp;</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  } <span class="comment">// as don't use min/max - make sure label1 < label2</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> </div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  <span class="keywordtype">float</span> label1_cnt;</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="keywordtype">float</span> label2_cnt;</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="keywordflow">if</span> (label1 != label2)</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  {</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  label1_cnt = (float)(all.<a class="code" href="structvw.html#aada16c220b8d3eaf62aaee86168dde5e">sd</a>-><a class="code" href="structshared__data.html#a462fe3c516f5d87de08862c7d7a9136d">weighted_labels</a> - label2 * all.<a class="code" href="structvw.html#aada16c220b8d3eaf62aaee86168dde5e">sd</a>-><a class="code" href="structshared__data.html#a92ff45eb41fa4b3ccab7576925c6acdc">weighted_labeled_examples</a>) / (label1 - label2);</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  label2_cnt = (float)all.<a class="code" href="structvw.html#aada16c220b8d3eaf62aaee86168dde5e">sd</a>-><a class="code" href="structshared__data.html#a92ff45eb41fa4b3ccab7576925c6acdc">weighted_labeled_examples</a> - label1_cnt;</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  }</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keywordflow">if</span> ((label1_cnt + label2_cnt) <= 0.)</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keyword">auto</span> funcName = all.<a class="code" href="structvw.html#a6d53e7b5144384bf3e68fd8d7566a39a">loss</a>-><a class="code" href="classloss__function.html#a7a9fc3e21b0331c6cafb0a81ff7966d8">getType</a>();</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordflow">if</span> (funcName.compare(<span class="stringliteral">"squared"</span>) == 0 || funcName.compare(<span class="stringliteral">"Huber"</span>) == 0 || funcName.compare(<span class="stringliteral">"classic"</span>) == 0)</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  best_constant = (<span class="keywordtype">float</span>)all.<a class="code" href="structvw.html#aada16c220b8d3eaf62aaee86168dde5e">sd</a>-><a class="code" href="structshared__data.html#a462fe3c516f5d87de08862c7d7a9136d">weighted_labels</a> / (float)(all.<a class="code" href="structvw.html#aada16c220b8d3eaf62aaee86168dde5e">sd</a>-><a class="code" href="structshared__data.html#a92ff45eb41fa4b3ccab7576925c6acdc">weighted_labeled_examples</a>);</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (all.<a class="code" href="structvw.html#aada16c220b8d3eaf62aaee86168dde5e">sd</a>-><a class="code" href="structshared__data.html#a959e85b4cdc13fa50902e95ab83cc7c9">is_more_than_two_labels_observed</a>)</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  {</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="comment">// loss functions below don't have generic formuas for constant yet.</span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  }</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (funcName.compare(<span class="stringliteral">"hinge"</span>) == 0)</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  {</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  best_constant = label2_cnt <= label1_cnt ? -1.f : 1.f;</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  }</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (funcName.compare(<span class="stringliteral">"logistic"</span>) == 0)</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  {</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  label1 = -1.; <span class="comment">// override {-50, 50} to get proper loss</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  label2 = 1.;</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keywordflow">if</span> (label1_cnt <= 0)</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  best_constant = 1.;</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (label2_cnt <= 0)</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  best_constant = -1.;</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  best_constant = log(label2_cnt / label1_cnt);</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  }</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (funcName.compare(<span class="stringliteral">"quantile"</span>) == 0 || funcName.compare(<span class="stringliteral">"pinball"</span>) == 0 || funcName.compare(<span class="stringliteral">"absolute"</span>) == 0)</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  {</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordtype">float</span> tau = 0.5;</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">if</span> (all.<a class="code" href="structvw.html#a96492966f30556c1ba2b6b4932e7664d">options</a>-><a class="code" href="structVW_1_1config_1_1options__i.html#ab5171ac33158fca4580d3f0658c4929e">was_supplied</a>(<span class="stringliteral">"quantile_tau"</span>))</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  tau = all.<a class="code" href="structvw.html#a96492966f30556c1ba2b6b4932e7664d">options</a>-><a class="code" href="structVW_1_1config_1_1options__i.html#a6504279948e73f5824bad612c88712e7">get_typed_option</a><<span class="keywordtype">float</span>>(<span class="stringliteral">"quantile_tau"</span>).value();</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keywordtype">float</span> q = tau * (label1_cnt + label2_cnt);</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">if</span> (q < label2_cnt)</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  best_constant = label2;</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  best_constant = label1;</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  }</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> </div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keywordflow">if</span> (!all.<a class="code" href="structvw.html#aada16c220b8d3eaf62aaee86168dde5e">sd</a>-><a class="code" href="structshared__data.html#a959e85b4cdc13fa50902e95ab83cc7c9">is_more_than_two_labels_observed</a>)</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  {</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  best_constant_loss = (label1_cnt > 0) ? all.<a class="code" href="structvw.html#a6d53e7b5144384bf3e68fd8d7566a39a">loss</a>-><a class="code" href="classloss__function.html#a46f4d6f9bb6d90efdf4b0ffc5fcbba9e">getLoss</a>(all.<a class="code" href="structvw.html#aada16c220b8d3eaf62aaee86168dde5e">sd</a>, best_constant, label1) * label1_cnt : 0.0f;</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  best_constant_loss += (label2_cnt > 0) ? all.<a class="code" href="structvw.html#a6d53e7b5144384bf3e68fd8d7566a39a">loss</a>-><a class="code" href="classloss__function.html#a46f4d6f9bb6d90efdf4b0ffc5fcbba9e">getLoss</a>(all.<a class="code" href="structvw.html#aada16c220b8d3eaf62aaee86168dde5e">sd</a>, best_constant, label2) * label2_cnt : 0.0f;</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  best_constant_loss /= label1_cnt + label2_cnt;</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  }</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  best_constant_loss = FLT_MIN;</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> </div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> }</div><div class="ttc" id="structvw_html_a6d53e7b5144384bf3e68fd8d7566a39a"><div class="ttname"><a href="structvw.html#a6d53e7b5144384bf3e68fd8d7566a39a">vw::loss</a></div><div class="ttdeci">loss_function * loss</div><div class="ttdef"><b>Definition:</b> <a href="global__data_8h_source.html#l00523">global_data.h:523</a></div></div>
<div class="ttc" id="structvw_html_a96492966f30556c1ba2b6b4932e7664d"><div class="ttname"><a href="structvw.html#a96492966f30556c1ba2b6b4932e7664d">vw::options</a></div><div class="ttdeci">VW::config::options_i * options</div><div class="ttdef"><b>Definition:</b> <a href="global__data_8h_source.html#l00428">global_data.h:428</a></div></div>
<div class="ttc" id="structshared__data_html_a959e85b4cdc13fa50902e95ab83cc7c9"><div class="ttname"><a href="structshared__data.html#a959e85b4cdc13fa50902e95ab83cc7c9">shared_data::is_more_than_two_labels_observed</a></div><div class="ttdeci">bool is_more_than_two_labels_observed</div><div class="ttdef"><b>Definition:</b> <a href="global__data_8h_source.html#l00170">global_data.h:170</a></div></div>
<div class="ttc" id="structshared__data_html_acdead5f80e8283d6600d35a837cd0b97"><div class="ttname"><a href="structshared__data.html#acdead5f80e8283d6600d35a837cd0b97">shared_data::first_observed_label</a></div><div class="ttdeci">float first_observed_label</div><div class="ttdef"><b>Definition:</b> <a href="global__data_8h_source.html#l00171">global_data.h:171</a></div></div>
<div class="ttc" id="classloss__function_html_a46f4d6f9bb6d90efdf4b0ffc5fcbba9e"><div class="ttname"><a href="classloss__function.html#a46f4d6f9bb6d90efdf4b0ffc5fcbba9e">loss_function::getLoss</a></div><div class="ttdeci">virtual float getLoss(shared_data *, float prediction, float label)=0</div></div>
<div class="ttc" id="structvw_html_aada16c220b8d3eaf62aaee86168dde5e"><div class="ttname"><a href="structvw.html#aada16c220b8d3eaf62aaee86168dde5e">vw::sd</a></div><div class="ttdeci">shared_data * sd</div><div class="ttdef"><b>Definition:</b> <a href="global__data_8h_source.html#l00375">global_data.h:375</a></div></div>
<div class="ttc" id="structVW_1_1config_1_1options__i_html_a6504279948e73f5824bad612c88712e7"><div class="ttname"><a href="structVW_1_1config_1_1options__i.html#a6504279948e73f5824bad612c88712e7">VW::config::options_i::get_typed_option</a></div><div class="ttdeci">typed_option< T > & get_typed_option(const std::string &key)</div><div class="ttdef"><b>Definition:</b> <a href="options_8h_source.html#l00120">options.h:120</a></div></div>
<div class="ttc" id="structVW_1_1config_1_1options__i_html_ab5171ac33158fca4580d3f0658c4929e"><div class="ttname"><a href="structVW_1_1config_1_1options__i.html#ab5171ac33158fca4580d3f0658c4929e">VW::config::options_i::was_supplied</a></div><div class="ttdeci">virtual bool was_supplied(const std::string &key)=0</div></div>
<div class="ttc" id="classloss__function_html_a7a9fc3e21b0331c6cafb0a81ff7966d8"><div class="ttname"><a href="classloss__function.html#a7a9fc3e21b0331c6cafb0a81ff7966d8">loss_function::getType</a></div><div class="ttdeci">virtual std::string getType()=0</div></div>
<div class="ttc" id="structshared__data_html_a462fe3c516f5d87de08862c7d7a9136d"><div class="ttname"><a href="structshared__data.html#a462fe3c516f5d87de08862c7d7a9136d">shared_data::weighted_labels</a></div><div class="ttdeci">double weighted_labels</div><div class="ttdef"><b>Definition:</b> <a href="global__data_8h_source.html#l00144">global_data.h:144</a></div></div>
<div class="ttc" id="structshared__data_html_a92ff45eb41fa4b3ccab7576925c6acdc"><div class="ttname"><a href="structshared__data.html#a92ff45eb41fa4b3ccab7576925c6acdc">shared_data::weighted_labeled_examples</a></div><div class="ttdeci">double weighted_labeled_examples</div><div class="ttdef"><b>Definition:</b> <a href="global__data_8h_source.html#l00141">global_data.h:141</a></div></div>
<div class="ttc" id="structshared__data_html_aa8665db15ad6cea576c387bfc1236e4a"><div class="ttname"><a href="structshared__data.html#aa8665db15ad6cea576c387bfc1236e4a">shared_data::second_observed_label</a></div><div class="ttdeci">float second_observed_label</div><div class="ttdef"><b>Definition:</b> <a href="global__data_8h_source.html#l00172">global_data.h:172</a></div></div>
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