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<a href="adaptative__parameter__value_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">// Copyright 2010-2021 Google LLC</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment">// Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment">// you may not use this file except in compliance with the License.</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment">// You may obtain a copy of the License at</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="comment">// distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="comment">// See the License for the specific language governing permissions and</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="comment">// limitations under the License.</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;</div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="preprocessor">#ifndef OR_TOOLS_UTIL_ADAPTATIVE_PARAMETER_VALUE_H_</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="preprocessor">#define OR_TOOLS_UTIL_ADAPTATIVE_PARAMETER_VALUE_H_</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="preprocessor">#include &lt;algorithm&gt;</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="preprocessor">#include &lt;cmath&gt;</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="preprocessor">#include &lt;cstdint&gt;</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="integral__types_8h.html">ortools/base/integral_types.h</a>&quot;</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespaceoperations__research.html">operations_research</a> {</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;<span class="comment">// Basic adaptive [0.0, 1.0] parameter that can be increased or decreased with a</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;<span class="comment">// step that get smaller and smaller with the number of updates.</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160;<span class="comment">// After a while, if the probability of getting a Decrease() vs Increase() when</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160;<span class="comment">// running at a given value is f(value), then this should converge towards a</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160;<span class="comment">// value such that f(value) = 0.5 provided f is a non-decreasing function over</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160;<span class="comment">// [0.0, 1.0].</span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160;<span class="comment">// TODO(user): The current logic work well in practice, but has no strong</span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160;<span class="comment">// theoretical foundation. We should be able to come up with a better understood</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160;<span class="comment">// formula that converge way faster. It will also be nice to generalize the 0.5</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;<span class="comment">// above to a target probability p.</span></div><div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="classoperations__research_1_1_adaptive_parameter_value.html"> 37</a></span>&#160;<span class="keyword">class </span><a class="code" href="classoperations__research_1_1_adaptive_parameter_value.html">AdaptiveParameterValue</a> {</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160; <span class="keyword">public</span>:</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; <span class="comment">// Initial value is in [0.0, 1.0], both 0.0 and 1.0 are valid.</span></div><div class="line"><a name="l00040"></a><span class="lineno"><a class="line" href="classoperations__research_1_1_adaptive_parameter_value.html#a5910cbe817fbb6a65be0c3ddf2534f35"> 40</a></span>&#160; <span class="keyword">explicit</span> <a class="code" href="classoperations__research_1_1_adaptive_parameter_value.html#a5910cbe817fbb6a65be0c3ddf2534f35">AdaptiveParameterValue</a>(<span class="keywordtype">double</span> initial_value)</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160; : value_(initial_value) {}</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;</div><div class="line"><a name="l00043"></a><span class="lineno"><a class="line" href="classoperations__research_1_1_adaptive_parameter_value.html#a372de693ad40b3f42839c8ec6ac845f4"> 43</a></span>&#160; <span class="keywordtype">void</span> <a class="code" href="classoperations__research_1_1_adaptive_parameter_value.html#a372de693ad40b3f42839c8ec6ac845f4">Reset</a>() { num_changes_ = 0; }</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160;</div><div class="line"><a name="l00045"></a><span class="lineno"><a class="line" href="classoperations__research_1_1_adaptive_parameter_value.html#ab7ff2156358799e542088856d0629b4d"> 45</a></span>&#160; <span class="keywordtype">void</span> <a class="code" href="classoperations__research_1_1_adaptive_parameter_value.html#ab7ff2156358799e542088856d0629b4d">Increase</a>() {</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; <span class="keyword">const</span> <span class="keywordtype">double</span> factor = IncreaseNumChangesAndGetFactor();</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; value_ = <a class="code" href="alldiff__cst_8cc.html#ad10edae0a852d72fb76afb1c77735045">std::min</a>(1.0 - (1.0 - value_) / factor, value_ * factor);</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; }</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160;</div><div class="line"><a name="l00050"></a><span class="lineno"><a class="line" href="classoperations__research_1_1_adaptive_parameter_value.html#a1279941cc24e4b9a3f35ff075b7943ac"> 50</a></span>&#160; <span class="keywordtype">void</span> <a class="code" href="classoperations__research_1_1_adaptive_parameter_value.html#a1279941cc24e4b9a3f35ff075b7943ac">Decrease</a>() {</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; <span class="keyword">const</span> <span class="keywordtype">double</span> factor = IncreaseNumChangesAndGetFactor();</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; value_ = <a class="code" href="alldiff__cst_8cc.html#a26e6db9bcc64b584051ecc28171ed11f">std::max</a>(value_ / factor, 1.0 - (1.0 - value_) * factor);</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; }</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160;</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; <span class="comment">// If we get more than 1 datapoints from the same value(), we use a formula</span></div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; <span class="comment">// that is more sound than calling n times Increase()/Decrease() which depends</span></div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; <span class="comment">// on the order of calls.</span></div><div class="line"><a name="l00058"></a><span class="lineno"><a class="line" href="classoperations__research_1_1_adaptive_parameter_value.html#af9bf551154d37f48132472bd0f6dd848"> 58</a></span>&#160; <span class="keywordtype">void</span> <a class="code" href="classoperations__research_1_1_adaptive_parameter_value.html#af9bf551154d37f48132472bd0f6dd848">Update</a>(<span class="keywordtype">int</span> num_decreases, <span class="keywordtype">int</span> num_increases) {</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; <span class="keywordflow">if</span> (num_decreases == num_increases) {</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; num_changes_ += num_decreases + num_increases;</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (num_decreases &lt; num_increases) {</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = num_decreases; i &lt; num_increases; ++i) <a class="code" href="classoperations__research_1_1_adaptive_parameter_value.html#ab7ff2156358799e542088856d0629b4d">Increase</a>();</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; num_changes_ += 2 * num_decreases;</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = num_increases; i &lt; num_decreases; ++i) <a class="code" href="classoperations__research_1_1_adaptive_parameter_value.html#a1279941cc24e4b9a3f35ff075b7943ac">Decrease</a>();</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; num_changes_ += 2 * num_increases;</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; }</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; }</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160;</div><div class="line"><a name="l00070"></a><span class="lineno"><a class="line" href="classoperations__research_1_1_adaptive_parameter_value.html#a374f9f0250d7e270cc4bf301edb46523"> 70</a></span>&#160; <span class="keywordtype">double</span> <a class="code" href="classoperations__research_1_1_adaptive_parameter_value.html#a374f9f0250d7e270cc4bf301edb46523">value</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> value_; }</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160;</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; <span class="keyword">private</span>:</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; <span class="comment">// We want to change the parameters more and more slowly.</span></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; <span class="keywordtype">double</span> IncreaseNumChangesAndGetFactor() {</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; ++num_changes_;</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; <span class="keywordflow">return</span> 1.0 + 1.0 / std::sqrt(num_changes_ + 1);</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; }</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160;</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; <span class="keywordtype">double</span> value_;</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160; int64_t num_changes_ = 0;</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160;};</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160;</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160;} <span class="comment">// namespace operations_research</span></div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160;</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160;<span class="preprocessor">#endif // OR_TOOLS_UTIL_ADAPTATIVE_PARAMETER_VALUE_H_</span></div><div class="ttc" id="classoperations__research_1_1_adaptive_parameter_value_html_af9bf551154d37f48132472bd0f6dd848"><div class="ttname"><a href="classoperations__research_1_1_adaptive_parameter_value.html#af9bf551154d37f48132472bd0f6dd848">operations_research::AdaptiveParameterValue::Update</a></div><div class="ttdeci">void Update(int num_decreases, int num_increases)</div><div class="ttdef"><b>Definition:</b> <a href="adaptative__parameter__value_8h_source.html#l00058">adaptative_parameter_value.h:58</a></div></div>
<div class="ttc" id="alldiff__cst_8cc_html_ad10edae0a852d72fb76afb1c77735045"><div class="ttname"><a href="alldiff__cst_8cc.html#ad10edae0a852d72fb76afb1c77735045">min</a></div><div class="ttdeci">int64_t min</div><div class="ttdef"><b>Definition:</b> <a href="alldiff__cst_8cc_source.html#l00139">alldiff_cst.cc:139</a></div></div>
<div class="ttc" id="classoperations__research_1_1_adaptive_parameter_value_html_a5910cbe817fbb6a65be0c3ddf2534f35"><div class="ttname"><a href="classoperations__research_1_1_adaptive_parameter_value.html#a5910cbe817fbb6a65be0c3ddf2534f35">operations_research::AdaptiveParameterValue::AdaptiveParameterValue</a></div><div class="ttdeci">AdaptiveParameterValue(double initial_value)</div><div class="ttdef"><b>Definition:</b> <a href="adaptative__parameter__value_8h_source.html#l00040">adaptative_parameter_value.h:40</a></div></div>
<div class="ttc" id="integral__types_8h_html"><div class="ttname"><a href="integral__types_8h.html">integral_types.h</a></div></div>
<div class="ttc" id="classoperations__research_1_1_adaptive_parameter_value_html_a1279941cc24e4b9a3f35ff075b7943ac"><div class="ttname"><a href="classoperations__research_1_1_adaptive_parameter_value.html#a1279941cc24e4b9a3f35ff075b7943ac">operations_research::AdaptiveParameterValue::Decrease</a></div><div class="ttdeci">void Decrease()</div><div class="ttdef"><b>Definition:</b> <a href="adaptative__parameter__value_8h_source.html#l00050">adaptative_parameter_value.h:50</a></div></div>
<div class="ttc" id="alldiff__cst_8cc_html_a26e6db9bcc64b584051ecc28171ed11f"><div class="ttname"><a href="alldiff__cst_8cc.html#a26e6db9bcc64b584051ecc28171ed11f">max</a></div><div class="ttdeci">int64_t max</div><div class="ttdef"><b>Definition:</b> <a href="alldiff__cst_8cc_source.html#l00140">alldiff_cst.cc:140</a></div></div>
<div class="ttc" id="classoperations__research_1_1_adaptive_parameter_value_html_ab7ff2156358799e542088856d0629b4d"><div class="ttname"><a href="classoperations__research_1_1_adaptive_parameter_value.html#ab7ff2156358799e542088856d0629b4d">operations_research::AdaptiveParameterValue::Increase</a></div><div class="ttdeci">void Increase()</div><div class="ttdef"><b>Definition:</b> <a href="adaptative__parameter__value_8h_source.html#l00045">adaptative_parameter_value.h:45</a></div></div>
<div class="ttc" id="namespaceoperations__research_html"><div class="ttname"><a href="namespaceoperations__research.html">operations_research</a></div><div class="ttdoc">Collection of objects used to extend the Constraint Solver library.</div><div class="ttdef"><b>Definition:</b> <a href="dense__doubly__linked__list_8h_source.html#l00021">dense_doubly_linked_list.h:21</a></div></div>
<div class="ttc" id="classoperations__research_1_1_adaptive_parameter_value_html_a372de693ad40b3f42839c8ec6ac845f4"><div class="ttname"><a href="classoperations__research_1_1_adaptive_parameter_value.html#a372de693ad40b3f42839c8ec6ac845f4">operations_research::AdaptiveParameterValue::Reset</a></div><div class="ttdeci">void Reset()</div><div class="ttdef"><b>Definition:</b> <a href="adaptative__parameter__value_8h_source.html#l00043">adaptative_parameter_value.h:43</a></div></div>
<div class="ttc" id="classoperations__research_1_1_adaptive_parameter_value_html_a374f9f0250d7e270cc4bf301edb46523"><div class="ttname"><a href="classoperations__research_1_1_adaptive_parameter_value.html#a374f9f0250d7e270cc4bf301edb46523">operations_research::AdaptiveParameterValue::value</a></div><div class="ttdeci">double value() const</div><div class="ttdef"><b>Definition:</b> <a href="adaptative__parameter__value_8h_source.html#l00070">adaptative_parameter_value.h:70</a></div></div>
<div class="ttc" id="classoperations__research_1_1_adaptive_parameter_value_html"><div class="ttname"><a href="classoperations__research_1_1_adaptive_parameter_value.html">operations_research::AdaptiveParameterValue</a></div><div class="ttdef"><b>Definition:</b> <a href="adaptative__parameter__value_8h_source.html#l00037">adaptative_parameter_value.h:37</a></div></div>
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