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<title>Algorithms_in_C++: machine_learning::aystar_search::AyStarSearch&lt; Puzzle &gt; Class Template Reference</title>
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@@ -30,8 +30,8 @@ MathJax.Hub.Config({
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<div id="projectname">Algorithms_in_C++<span id="projectnumber">&#160;1.0.0</span>
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<div id="projectbrief">Set of algorithms implemented in C++.</div>
@@ -41,7 +41,7 @@ MathJax.Hub.Config({
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@@ -103,6 +103,12 @@ $(document).ready(function(){initNavTree('da/d02/classmachine__learning_1_1aysta
<p>A class defining <a href="https://en.wikipedia.org/wiki/A*_search_algorithm" target="_blank">A* search algorithm</a>. for some initial state and final state.
<a href="../../da/d02/classmachine__learning_1_1aystar__search_1_1_ay_star_search.html#details">More...</a></p>
<div class="dynheader">
Collaboration diagram for machine_learning::aystar_search::AyStarSearch&lt; Puzzle &gt;:</div>
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<div class="center"><iframe scrolling="no" frameborder="0" src="../../d7/db3/classmachine__learning_1_1aystar__search_1_1_ay_star_search__coll__graph.svg" width="184" height="408"><p><b>This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.</b></p></iframe>
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Classes</h2></td></tr>
@@ -178,7 +184,7 @@ template&lt;typename Puzzle &gt; </div>
<td class="mlabels-left">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="../../da/d02/classmachine__learning_1_1aystar__search_1_1_ay_star_search.html">machine_learning::aystar_search::AyStarSearch</a>&lt; Puzzle &gt;::<a class="el" href="../../da/d02/classmachine__learning_1_1aystar__search_1_1_ay_star_search.html">AyStarSearch</a> </td>
<td class="memname"><a class="el" href="../../da/d02/classmachine__learning_1_1aystar__search_1_1_ay_star_search.html">machine_learning::aystar_search::AyStarSearch</a>&lt; Puzzle &gt;::AyStarSearch </td>
<td>(</td>
<td class="paramtype">const Puzzle &amp;&#160;</td>
<td class="paramname"><em>initial</em>, </td>
@@ -210,10 +216,10 @@ template&lt;typename Puzzle &gt; </div>
</table>
</dd>
</dl>
<div class="fragment"><div class="line"><a id="l00392" name="l00392"></a><span class="lineno"> 392</span> {</div>
<div class="line"><a id="l00393" name="l00393"></a><span class="lineno"> 393</span> Initial = std::make_shared&lt;Info&gt;(initial);</div>
<div class="line"><a id="l00394" name="l00394"></a><span class="lineno"> 394</span> Final = std::make_shared&lt;Info&gt;(<span class="keyword">final</span>);</div>
<div class="line"><a id="l00395" name="l00395"></a><span class="lineno"> 395</span> }</div>
<div class="fragment"><div class="line"><span class="lineno"> 392</span> {</div>
<div class="line"><span class="lineno"> 393</span> Initial = std::make_shared&lt;Info&gt;(initial);</div>
<div class="line"><span class="lineno"> 394</span> Final = std::make_shared&lt;Info&gt;(<span class="keyword">final</span>);</div>
<div class="line"><span class="lineno"> 395</span> }</div>
</div><!-- fragment -->
</div>
</div>
@@ -265,101 +271,101 @@ template&lt;typename Puzzle &gt; </div>
<p >Stores the g_score</p>
<p >Stores the list to explore</p>
<p >Stores the list that are explored</p>
<div class="fragment"><div class="line"><a id="l00431" name="l00431"></a><span class="lineno"> 431</span> {</div>
<div class="line"><a id="l00432" name="l00432"></a><span class="lineno"> 432</span> MapOfPuzzleInfoWithPuzzleInfo</div>
<div class="line"><a id="l00433" name="l00433"></a><span class="lineno"> 433</span> parent_of; <span class="comment">/// Stores the parent of the states</span></div>
<div class="line"><a id="l00434" name="l00434"></a><span class="lineno"> 434</span> MapOfPuzzleInfoWithInteger g_score; <span class="comment">/// Stores the g_score</span></div>
<div class="line"><a id="l00435" name="l00435"></a><span class="lineno"> 435</span> SetOfPuzzleInfo open_list; <span class="comment">/// Stores the list to explore</span></div>
<div class="line"><a id="l00436" name="l00436"></a><span class="lineno"> 436</span> SetOfPuzzleInfo closed_list; <span class="comment">/// Stores the list that are explored</span></div>
<div class="line"><a id="l00437" name="l00437"></a><span class="lineno"> 437</span> </div>
<div class="line"><a id="l00438" name="l00438"></a><span class="lineno"> 438</span> <span class="comment">// Before starting the AyStartSearch, initialize the set and maps</span></div>
<div class="line"><a id="l00439" name="l00439"></a><span class="lineno"> 439</span> open_list.emplace(Initial);</div>
<div class="line"><a id="l00440" name="l00440"></a><span class="lineno"> 440</span> parent_of[Initial] = <span class="keyword">nullptr</span>;</div>
<div class="line"><a id="l00441" name="l00441"></a><span class="lineno"> 441</span> g_score[Initial] = 0;</div>
<div class="line"><a id="l00442" name="l00442"></a><span class="lineno"> 442</span> </div>
<div class="line"><a id="l00443" name="l00443"></a><span class="lineno"> 443</span> <span class="keywordflow">while</span> (!open_list.empty()) {</div>
<div class="line"><a id="l00444" name="l00444"></a><span class="lineno"> 444</span> <span class="comment">// Iterator for state having having lowest f_score.</span></div>
<div class="line"><a id="l00445" name="l00445"></a><span class="lineno"> 445</span> <span class="keyword">typename</span> SetOfPuzzleInfo::iterator it_low_f_score;</div>
<div class="line"><a id="l00446" name="l00446"></a><span class="lineno"> 446</span> uint32_t min_f_score = 1e9;</div>
<div class="line"><a id="l00447" name="l00447"></a><span class="lineno"> 447</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span> iter = open_list.begin(); iter != open_list.end();</div>
<div class="line"><a id="l00448" name="l00448"></a><span class="lineno"> 448</span> ++iter) {</div>
<div class="line"><a id="l00449" name="l00449"></a><span class="lineno"> 449</span> <span class="comment">// f score here is evaluated by g score (depth) and h score</span></div>
<div class="line"><a id="l00450" name="l00450"></a><span class="lineno"> 450</span> <span class="comment">// (distance between current state and final state)</span></div>
<div class="line"><a id="l00451" name="l00451"></a><span class="lineno"> 451</span> uint32_t f_score = (*iter)-&gt;heuristic_value + (*iter)-&gt;depth;</div>
<div class="line"><a id="l00452" name="l00452"></a><span class="lineno"> 452</span> <span class="keywordflow">if</span> (f_score &lt; min_f_score) {</div>
<div class="line"><a id="l00453" name="l00453"></a><span class="lineno"> 453</span> min_f_score = f_score;</div>
<div class="line"><a id="l00454" name="l00454"></a><span class="lineno"> 454</span> it_low_f_score = iter;</div>
<div class="line"><a id="l00455" name="l00455"></a><span class="lineno"> 455</span> }</div>
<div class="line"><a id="l00456" name="l00456"></a><span class="lineno"> 456</span> }</div>
<div class="line"><a id="l00457" name="l00457"></a><span class="lineno"> 457</span> </div>
<div class="line"><a id="l00458" name="l00458"></a><span class="lineno"> 458</span> <span class="comment">// current_state, stores lowest f score so far for this state.</span></div>
<div class="line"><a id="l00459" name="l00459"></a><span class="lineno"> 459</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/memory/shared_ptr.html">std::shared_ptr&lt;Info&gt;</a> current_state = *it_low_f_score;</div>
<div class="line"><a id="l00460" name="l00460"></a><span class="lineno"> 460</span> </div>
<div class="line"><a id="l00461" name="l00461"></a><span class="lineno"> 461</span> <span class="comment">// if this current state is equal to final, return</span></div>
<div class="line"><a id="l00462" name="l00462"></a><span class="lineno"> 462</span> <span class="keywordflow">if</span> (*(current_state-&gt;state) == *(Final-&gt;state)) {</div>
<div class="line"><a id="l00463" name="l00463"></a><span class="lineno"> 463</span> <span class="keywordflow">return</span> <a class="code hl_function" href="../../da/d02/classmachine__learning_1_1aystar__search_1_1_ay_star_search.html#a0a26aa9ad3d73707370d9fe83707aca4">Solution</a>(current_state, parent_of);</div>
<div class="line"><a id="l00464" name="l00464"></a><span class="lineno"> 464</span> }</div>
<div class="line"><a id="l00465" name="l00465"></a><span class="lineno"> 465</span> <span class="comment">// else remove from open list as visited.</span></div>
<div class="line"><a id="l00466" name="l00466"></a><span class="lineno"> 466</span> open_list.erase(it_low_f_score);</div>
<div class="line"><a id="l00467" name="l00467"></a><span class="lineno"> 467</span> <span class="comment">// if current_state has exceeded the allowed depth, skip</span></div>
<div class="line"><a id="l00468" name="l00468"></a><span class="lineno"> 468</span> <span class="comment">// neighbor checking</span></div>
<div class="line"><a id="l00469" name="l00469"></a><span class="lineno"> 469</span> <span class="keywordflow">if</span> (current_state-&gt;depth &gt;= permissible_depth) {</div>
<div class="line"><a id="l00470" name="l00470"></a><span class="lineno"> 470</span> <span class="keywordflow">continue</span>;</div>
<div class="line"><a id="l00471" name="l00471"></a><span class="lineno"> 471</span> }</div>
<div class="line"><a id="l00472" name="l00472"></a><span class="lineno"> 472</span> <span class="comment">// Generate all possible moves (neighbors) given the current</span></div>
<div class="line"><a id="l00473" name="l00473"></a><span class="lineno"> 473</span> <span class="comment">// state</span></div>
<div class="line"><a id="l00474" name="l00474"></a><span class="lineno"> 474</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;Puzzle&gt;</a> total_possible_moves =</div>
<div class="line"><a id="l00475" name="l00475"></a><span class="lineno"> 475</span> current_state-&gt;state-&gt;generate_possible_moves();</div>
<div class="line"><a id="l00476" name="l00476"></a><span class="lineno"> 476</span> </div>
<div class="line"><a id="l00477" name="l00477"></a><span class="lineno"> 477</span> <span class="keywordflow">for</span> (Puzzle &amp;neighbor : total_possible_moves) {</div>
<div class="line"><a id="l00478" name="l00478"></a><span class="lineno"> 478</span> <span class="comment">// calculate score of neighbors with respect to</span></div>
<div class="line"><a id="l00479" name="l00479"></a><span class="lineno"> 479</span> <span class="comment">// current_state</span></div>
<div class="line"><a id="l00480" name="l00480"></a><span class="lineno"> 480</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/memory/shared_ptr.html">std::shared_ptr&lt;Info&gt;</a> Neighbor = std::make_shared&lt;Info&gt;(</div>
<div class="line"><a id="l00481" name="l00481"></a><span class="lineno"> 481</span> neighbor, dist(neighbor, *(Final-&gt;state)),</div>
<div class="line"><a id="l00482" name="l00482"></a><span class="lineno"> 482</span> current_state-&gt;depth + 1U);</div>
<div class="line"><a id="l00483" name="l00483"></a><span class="lineno"> 483</span> uint32_t temp_g_score = Neighbor-&gt;depth;</div>
<div class="line"><a id="l00484" name="l00484"></a><span class="lineno"> 484</span> </div>
<div class="line"><a id="l00485" name="l00485"></a><span class="lineno"> 485</span> <span class="comment">// Check whether this state is explored.</span></div>
<div class="line"><a id="l00486" name="l00486"></a><span class="lineno"> 486</span> <span class="comment">// If this state is discovered at greater depth, then discard,</span></div>
<div class="line"><a id="l00487" name="l00487"></a><span class="lineno"> 487</span> <span class="comment">// else remove from closed list and explore the node</span></div>
<div class="line"><a id="l00488" name="l00488"></a><span class="lineno"> 488</span> <span class="keyword">auto</span> closed_list_iter = closed_list.find(Neighbor);</div>
<div class="line"><a id="l00489" name="l00489"></a><span class="lineno"> 489</span> <span class="keywordflow">if</span> (closed_list_iter != closed_list.end()) {</div>
<div class="line"><a id="l00490" name="l00490"></a><span class="lineno"> 490</span> <span class="comment">// 1. If state in closed list has higher depth, then remove</span></div>
<div class="line"><a id="l00491" name="l00491"></a><span class="lineno"> 491</span> <span class="comment">// from list since we have found better option,</span></div>
<div class="line"><a id="l00492" name="l00492"></a><span class="lineno"> 492</span> <span class="comment">// 2. Else don&#39;t explore this state.</span></div>
<div class="line"><a id="l00493" name="l00493"></a><span class="lineno"> 493</span> <span class="keywordflow">if</span> (Neighbor-&gt;depth &lt; (*closed_list_iter)-&gt;depth) {</div>
<div class="line"><a id="l00494" name="l00494"></a><span class="lineno"> 494</span> closed_list.erase(closed_list_iter);</div>
<div class="line"><a id="l00495" name="l00495"></a><span class="lineno"> 495</span> } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00496" name="l00496"></a><span class="lineno"> 496</span> <span class="keywordflow">continue</span>;</div>
<div class="line"><a id="l00497" name="l00497"></a><span class="lineno"> 497</span> }</div>
<div class="line"><a id="l00498" name="l00498"></a><span class="lineno"> 498</span> }</div>
<div class="line"><a id="l00499" name="l00499"></a><span class="lineno"> 499</span> <span class="keyword">auto</span> neighbor_g_score_iter = g_score.find(Neighbor);</div>
<div class="line"><a id="l00500" name="l00500"></a><span class="lineno"> 500</span> <span class="comment">// if the neighbor is already created and has minimum</span></div>
<div class="line"><a id="l00501" name="l00501"></a><span class="lineno"> 501</span> <span class="comment">// g_score, then update g_score and f_score else insert new</span></div>
<div class="line"><a id="l00502" name="l00502"></a><span class="lineno"> 502</span> <span class="keywordflow">if</span> (neighbor_g_score_iter != g_score.end()) {</div>
<div class="line"><a id="l00503" name="l00503"></a><span class="lineno"> 503</span> <span class="keywordflow">if</span> (neighbor_g_score_iter-&gt;second &gt; temp_g_score) {</div>
<div class="line"><a id="l00504" name="l00504"></a><span class="lineno"> 504</span> neighbor_g_score_iter-&gt;second = temp_g_score;</div>
<div class="line"><a id="l00505" name="l00505"></a><span class="lineno"> 505</span> parent_of[Neighbor] = current_state;</div>
<div class="line"><a id="l00506" name="l00506"></a><span class="lineno"> 506</span> }</div>
<div class="line"><a id="l00507" name="l00507"></a><span class="lineno"> 507</span> } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00508" name="l00508"></a><span class="lineno"> 508</span> g_score[Neighbor] = temp_g_score;</div>
<div class="line"><a id="l00509" name="l00509"></a><span class="lineno"> 509</span> parent_of[Neighbor] = current_state;</div>
<div class="line"><a id="l00510" name="l00510"></a><span class="lineno"> 510</span> }</div>
<div class="line"><a id="l00511" name="l00511"></a><span class="lineno"> 511</span> <span class="comment">// If this is a new state, insert into open_list</span></div>
<div class="line"><a id="l00512" name="l00512"></a><span class="lineno"> 512</span> <span class="comment">// else update if the this state has better g score than</span></div>
<div class="line"><a id="l00513" name="l00513"></a><span class="lineno"> 513</span> <span class="comment">// existing one.</span></div>
<div class="line"><a id="l00514" name="l00514"></a><span class="lineno"> 514</span> <span class="keyword">auto</span> iter = open_list.find(Neighbor);</div>
<div class="line"><a id="l00515" name="l00515"></a><span class="lineno"> 515</span> <span class="keywordflow">if</span> (iter == open_list.end()) {</div>
<div class="line"><a id="l00516" name="l00516"></a><span class="lineno"> 516</span> open_list.emplace(Neighbor);</div>
<div class="line"><a id="l00517" name="l00517"></a><span class="lineno"> 517</span> } <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((*iter)-&gt;depth &gt; Neighbor-&gt;depth) {</div>
<div class="line"><a id="l00518" name="l00518"></a><span class="lineno"> 518</span> (*iter)-&gt;depth = Neighbor-&gt;depth;</div>
<div class="line"><a id="l00519" name="l00519"></a><span class="lineno"> 519</span> }</div>
<div class="line"><a id="l00520" name="l00520"></a><span class="lineno"> 520</span> }</div>
<div class="line"><a id="l00521" name="l00521"></a><span class="lineno"> 521</span> closed_list.emplace(current_state);</div>
<div class="line"><a id="l00522" name="l00522"></a><span class="lineno"> 522</span> }</div>
<div class="line"><a id="l00523" name="l00523"></a><span class="lineno"> 523</span> <span class="comment">// Cannot find the solution, return empty vector</span></div>
<div class="line"><a id="l00524" name="l00524"></a><span class="lineno"> 524</span> <span class="keywordflow">return</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;Puzzle&gt;</a>(0);</div>
<div class="line"><a id="l00525" name="l00525"></a><span class="lineno"> 525</span> }</div>
<div class="fragment"><div class="line"><span class="lineno"> 431</span> {</div>
<div class="line"><span class="lineno"> 432</span> MapOfPuzzleInfoWithPuzzleInfo</div>
<div class="line"><span class="lineno"> 433</span> parent_of; <span class="comment">/// Stores the parent of the states</span></div>
<div class="line"><span class="lineno"> 434</span> MapOfPuzzleInfoWithInteger g_score; <span class="comment">/// Stores the g_score</span></div>
<div class="line"><span class="lineno"> 435</span> SetOfPuzzleInfo open_list; <span class="comment">/// Stores the list to explore</span></div>
<div class="line"><span class="lineno"> 436</span> SetOfPuzzleInfo closed_list; <span class="comment">/// Stores the list that are explored</span></div>
<div class="line"><span class="lineno"> 437</span> </div>
<div class="line"><span class="lineno"> 438</span> <span class="comment">// Before starting the AyStartSearch, initialize the set and maps</span></div>
<div class="line"><span class="lineno"> 439</span> open_list.emplace(Initial);</div>
<div class="line"><span class="lineno"> 440</span> parent_of[Initial] = <span class="keyword">nullptr</span>;</div>
<div class="line"><span class="lineno"> 441</span> g_score[Initial] = 0;</div>
<div class="line"><span class="lineno"> 442</span> </div>
<div class="line"><span class="lineno"> 443</span> <span class="keywordflow">while</span> (!open_list.empty()) {</div>
<div class="line"><span class="lineno"> 444</span> <span class="comment">// Iterator for state having having lowest f_score.</span></div>
<div class="line"><span class="lineno"> 445</span> <span class="keyword">typename</span> SetOfPuzzleInfo::iterator it_low_f_score;</div>
<div class="line"><span class="lineno"> 446</span> uint32_t min_f_score = 1e9;</div>
<div class="line"><span class="lineno"> 447</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span> iter = open_list.begin(); iter != open_list.end();</div>
<div class="line"><span class="lineno"> 448</span> ++iter) {</div>
<div class="line"><span class="lineno"> 449</span> <span class="comment">// f score here is evaluated by g score (depth) and h score</span></div>
<div class="line"><span class="lineno"> 450</span> <span class="comment">// (distance between current state and final state)</span></div>
<div class="line"><span class="lineno"> 451</span> uint32_t f_score = (*iter)-&gt;heuristic_value + (*iter)-&gt;depth;</div>
<div class="line"><span class="lineno"> 452</span> <span class="keywordflow">if</span> (f_score &lt; min_f_score) {</div>
<div class="line"><span class="lineno"> 453</span> min_f_score = f_score;</div>
<div class="line"><span class="lineno"> 454</span> it_low_f_score = iter;</div>
<div class="line"><span class="lineno"> 455</span> }</div>
<div class="line"><span class="lineno"> 456</span> }</div>
<div class="line"><span class="lineno"> 457</span> </div>
<div class="line"><span class="lineno"> 458</span> <span class="comment">// current_state, stores lowest f score so far for this state.</span></div>
<div class="line"><span class="lineno"> 459</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/memory/shared_ptr.html">std::shared_ptr&lt;Info&gt;</a> current_state = *it_low_f_score;</div>
<div class="line"><span class="lineno"> 460</span> </div>
<div class="line"><span class="lineno"> 461</span> <span class="comment">// if this current state is equal to final, return</span></div>
<div class="line"><span class="lineno"> 462</span> <span class="keywordflow">if</span> (*(current_state-&gt;state) == *(Final-&gt;state)) {</div>
<div class="line"><span class="lineno"> 463</span> <span class="keywordflow">return</span> <a class="code hl_function" href="../../da/d02/classmachine__learning_1_1aystar__search_1_1_ay_star_search.html#a0a26aa9ad3d73707370d9fe83707aca4">Solution</a>(current_state, parent_of);</div>
<div class="line"><span class="lineno"> 464</span> }</div>
<div class="line"><span class="lineno"> 465</span> <span class="comment">// else remove from open list as visited.</span></div>
<div class="line"><span class="lineno"> 466</span> open_list.erase(it_low_f_score);</div>
<div class="line"><span class="lineno"> 467</span> <span class="comment">// if current_state has exceeded the allowed depth, skip</span></div>
<div class="line"><span class="lineno"> 468</span> <span class="comment">// neighbor checking</span></div>
<div class="line"><span class="lineno"> 469</span> <span class="keywordflow">if</span> (current_state-&gt;depth &gt;= permissible_depth) {</div>
<div class="line"><span class="lineno"> 470</span> <span class="keywordflow">continue</span>;</div>
<div class="line"><span class="lineno"> 471</span> }</div>
<div class="line"><span class="lineno"> 472</span> <span class="comment">// Generate all possible moves (neighbors) given the current</span></div>
<div class="line"><span class="lineno"> 473</span> <span class="comment">// state</span></div>
<div class="line"><span class="lineno"> 474</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;Puzzle&gt;</a> total_possible_moves =</div>
<div class="line"><span class="lineno"> 475</span> current_state-&gt;state-&gt;generate_possible_moves();</div>
<div class="line"><span class="lineno"> 476</span> </div>
<div class="line"><span class="lineno"> 477</span> <span class="keywordflow">for</span> (Puzzle &amp;neighbor : total_possible_moves) {</div>
<div class="line"><span class="lineno"> 478</span> <span class="comment">// calculate score of neighbors with respect to</span></div>
<div class="line"><span class="lineno"> 479</span> <span class="comment">// current_state</span></div>
<div class="line"><span class="lineno"> 480</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/memory/shared_ptr.html">std::shared_ptr&lt;Info&gt;</a> Neighbor = std::make_shared&lt;Info&gt;(</div>
<div class="line"><span class="lineno"> 481</span> neighbor, dist(neighbor, *(Final-&gt;state)),</div>
<div class="line"><span class="lineno"> 482</span> current_state-&gt;depth + 1U);</div>
<div class="line"><span class="lineno"> 483</span> uint32_t temp_g_score = Neighbor-&gt;depth;</div>
<div class="line"><span class="lineno"> 484</span> </div>
<div class="line"><span class="lineno"> 485</span> <span class="comment">// Check whether this state is explored.</span></div>
<div class="line"><span class="lineno"> 486</span> <span class="comment">// If this state is discovered at greater depth, then discard,</span></div>
<div class="line"><span class="lineno"> 487</span> <span class="comment">// else remove from closed list and explore the node</span></div>
<div class="line"><span class="lineno"> 488</span> <span class="keyword">auto</span> closed_list_iter = closed_list.find(Neighbor);</div>
<div class="line"><span class="lineno"> 489</span> <span class="keywordflow">if</span> (closed_list_iter != closed_list.end()) {</div>
<div class="line"><span class="lineno"> 490</span> <span class="comment">// 1. If state in closed list has higher depth, then remove</span></div>
<div class="line"><span class="lineno"> 491</span> <span class="comment">// from list since we have found better option,</span></div>
<div class="line"><span class="lineno"> 492</span> <span class="comment">// 2. Else don&#39;t explore this state.</span></div>
<div class="line"><span class="lineno"> 493</span> <span class="keywordflow">if</span> (Neighbor-&gt;depth &lt; (*closed_list_iter)-&gt;depth) {</div>
<div class="line"><span class="lineno"> 494</span> closed_list.erase(closed_list_iter);</div>
<div class="line"><span class="lineno"> 495</span> } <span class="keywordflow">else</span> {</div>
<div class="line"><span class="lineno"> 496</span> <span class="keywordflow">continue</span>;</div>
<div class="line"><span class="lineno"> 497</span> }</div>
<div class="line"><span class="lineno"> 498</span> }</div>
<div class="line"><span class="lineno"> 499</span> <span class="keyword">auto</span> neighbor_g_score_iter = g_score.find(Neighbor);</div>
<div class="line"><span class="lineno"> 500</span> <span class="comment">// if the neighbor is already created and has minimum</span></div>
<div class="line"><span class="lineno"> 501</span> <span class="comment">// g_score, then update g_score and f_score else insert new</span></div>
<div class="line"><span class="lineno"> 502</span> <span class="keywordflow">if</span> (neighbor_g_score_iter != g_score.end()) {</div>
<div class="line"><span class="lineno"> 503</span> <span class="keywordflow">if</span> (neighbor_g_score_iter-&gt;second &gt; temp_g_score) {</div>
<div class="line"><span class="lineno"> 504</span> neighbor_g_score_iter-&gt;second = temp_g_score;</div>
<div class="line"><span class="lineno"> 505</span> parent_of[Neighbor] = current_state;</div>
<div class="line"><span class="lineno"> 506</span> }</div>
<div class="line"><span class="lineno"> 507</span> } <span class="keywordflow">else</span> {</div>
<div class="line"><span class="lineno"> 508</span> g_score[Neighbor] = temp_g_score;</div>
<div class="line"><span class="lineno"> 509</span> parent_of[Neighbor] = current_state;</div>
<div class="line"><span class="lineno"> 510</span> }</div>
<div class="line"><span class="lineno"> 511</span> <span class="comment">// If this is a new state, insert into open_list</span></div>
<div class="line"><span class="lineno"> 512</span> <span class="comment">// else update if the this state has better g score than</span></div>
<div class="line"><span class="lineno"> 513</span> <span class="comment">// existing one.</span></div>
<div class="line"><span class="lineno"> 514</span> <span class="keyword">auto</span> iter = open_list.find(Neighbor);</div>
<div class="line"><span class="lineno"> 515</span> <span class="keywordflow">if</span> (iter == open_list.end()) {</div>
<div class="line"><span class="lineno"> 516</span> open_list.emplace(Neighbor);</div>
<div class="line"><span class="lineno"> 517</span> } <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((*iter)-&gt;depth &gt; Neighbor-&gt;depth) {</div>
<div class="line"><span class="lineno"> 518</span> (*iter)-&gt;depth = Neighbor-&gt;depth;</div>
<div class="line"><span class="lineno"> 519</span> }</div>
<div class="line"><span class="lineno"> 520</span> }</div>
<div class="line"><span class="lineno"> 521</span> closed_list.emplace(current_state);</div>
<div class="line"><span class="lineno"> 522</span> }</div>
<div class="line"><span class="lineno"> 523</span> <span class="comment">// Cannot find the solution, return empty vector</span></div>
<div class="line"><span class="lineno"> 524</span> <span class="keywordflow">return</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;Puzzle&gt;</a>(0);</div>
<div class="line"><span class="lineno"> 525</span> }</div>
<div class="ttc" id="aclassmachine__learning_1_1aystar__search_1_1_ay_star_search_html_a0a26aa9ad3d73707370d9fe83707aca4"><div class="ttname"><a href="../../da/d02/classmachine__learning_1_1aystar__search_1_1_ay_star_search.html#a0a26aa9ad3d73707370d9fe83707aca4">machine_learning::aystar_search::AyStarSearch::Solution</a></div><div class="ttdeci">std::vector&lt; Puzzle &gt; Solution(std::shared_ptr&lt; Info &gt; FinalState, const MapOfPuzzleInfoWithPuzzleInfo &amp;parent_of)</div><div class="ttdoc">A helper solution: launches when a solution for AyStarSearch is found.</div><div class="ttdef"><b>Definition:</b> a_star_search.cpp:405</div></div>
<div class="ttc" id="ashared_ptr_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/memory/shared_ptr.html">std::shared_ptr</a></div></div>
<div class="ttc" id="avector_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a></div></div>
@@ -384,7 +390,7 @@ template&lt;typename Puzzle &gt; </div>
<td class="mlabels-left">
<table class="memname">
<tr>
<td class="memname"><a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>&lt; Puzzle &gt; <a class="el" href="../../da/d02/classmachine__learning_1_1aystar__search_1_1_ay_star_search.html">machine_learning::aystar_search::AyStarSearch</a>&lt; Puzzle &gt;::<a class="el" href="../../dd/d4f/class_solution.html">Solution</a> </td>
<td class="memname"><a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>&lt; Puzzle &gt; <a class="el" href="../../da/d02/classmachine__learning_1_1aystar__search_1_1_ay_star_search.html">machine_learning::aystar_search::AyStarSearch</a>&lt; Puzzle &gt;<a class="el" href="../../dd/d4f/class_solution.html">::Solution</a> </td>
<td>(</td>
<td class="paramtype"><a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/memory/shared_ptr.html">std::shared_ptr</a>&lt; <a class="el" href="../../da/d70/structmachine__learning_1_1aystar__search_1_1_ay_star_search_1_1_info.html">Info</a> &gt;&#160;</td>
<td class="paramname"><em>FinalState</em>, </td>
@@ -417,20 +423,20 @@ template&lt;typename Puzzle &gt; </div>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>the list of moves denoting moves from final state to initial state (in reverse) </dd></dl>
<div class="fragment"><div class="line"><a id="l00407" name="l00407"></a><span class="lineno"> 407</span> {</div>
<div class="line"><a id="l00408" name="l00408"></a><span class="lineno"> 408</span> <span class="comment">// Useful for traversing from final state to current state.</span></div>
<div class="line"><a id="l00409" name="l00409"></a><span class="lineno"> 409</span> <span class="keyword">auto</span> current_state = FinalState;</div>
<div class="line"><a id="l00410" name="l00410"></a><span class="lineno"> 410</span> <span class="comment">/*</span></div>
<div class="line"><a id="l00411" name="l00411"></a><span class="lineno"> 411</span><span class="comment"> * For storing the solution tree starting from initial state to</span></div>
<div class="line"><a id="l00412" name="l00412"></a><span class="lineno"> 412</span><span class="comment"> * final state</span></div>
<div class="line"><a id="l00413" name="l00413"></a><span class="lineno"> 413</span><span class="comment"> */</span></div>
<div class="line"><a id="l00414" name="l00414"></a><span class="lineno"> 414</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;Puzzle&gt;</a> answer;</div>
<div class="line"><a id="l00415" name="l00415"></a><span class="lineno"> 415</span> <span class="keywordflow">while</span> (current_state != <span class="keyword">nullptr</span>) {</div>
<div class="line"><a id="l00416" name="l00416"></a><span class="lineno"> 416</span> answer.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector/emplace_back.html">emplace_back</a>(*current_state-&gt;state);</div>
<div class="line"><a id="l00417" name="l00417"></a><span class="lineno"> 417</span> current_state = parent_of.find(current_state)-&gt;second;</div>
<div class="line"><a id="l00418" name="l00418"></a><span class="lineno"> 418</span> }</div>
<div class="line"><a id="l00419" name="l00419"></a><span class="lineno"> 419</span> <span class="keywordflow">return</span> answer;</div>
<div class="line"><a id="l00420" name="l00420"></a><span class="lineno"> 420</span> }</div>
<div class="fragment"><div class="line"><span class="lineno"> 407</span> {</div>
<div class="line"><span class="lineno"> 408</span> <span class="comment">// Useful for traversing from final state to current state.</span></div>
<div class="line"><span class="lineno"> 409</span> <span class="keyword">auto</span> current_state = FinalState;</div>
<div class="line"><span class="lineno"> 410</span> <span class="comment">/*</span></div>
<div class="line"><span class="lineno"> 411</span><span class="comment"> * For storing the solution tree starting from initial state to</span></div>
<div class="line"><span class="lineno"> 412</span><span class="comment"> * final state</span></div>
<div class="line"><span class="lineno"> 413</span><span class="comment"> */</span></div>
<div class="line"><span class="lineno"> 414</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;Puzzle&gt;</a> answer;</div>
<div class="line"><span class="lineno"> 415</span> <span class="keywordflow">while</span> (current_state != <span class="keyword">nullptr</span>) {</div>
<div class="line"><span class="lineno"> 416</span> answer.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector/emplace_back.html">emplace_back</a>(*current_state-&gt;state);</div>
<div class="line"><span class="lineno"> 417</span> current_state = parent_of.find(current_state)-&gt;second;</div>
<div class="line"><span class="lineno"> 418</span> }</div>
<div class="line"><span class="lineno"> 419</span> <span class="keywordflow">return</span> answer;</div>
<div class="line"><span class="lineno"> 420</span> }</div>
<div class="ttc" id="aemplace_back_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/vector/emplace_back.html">std::vector::emplace_back</a></div><div class="ttdeci">T emplace_back(T... args)</div></div>
</div><!-- fragment --><div class="dynheader">
Here is the call graph for this function:</div>
@@ -450,7 +456,7 @@ Here is the call graph for this function:</div>
<div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
<ul>
<li class="navelem"><a class="el" href="../../d8/d77/namespacemachine__learning.html">machine_learning</a></li><li class="navelem"><b>aystar_search</b></li><li class="navelem"><a class="el" href="../../da/d02/classmachine__learning_1_1aystar__search_1_1_ay_star_search.html">AyStarSearch</a></li>
<li class="footer">Generated by <a href="https://www.doxygen.org/index.html"><img class="footer" src="../../doxygen.svg" width="104" height="31" alt="doxygen"/></a> 1.9.2 </li>
<li class="footer">Generated by <a href="https://www.doxygen.org/index.html"><img class="footer" src="../../doxygen.svg" width="104" height="31" alt="doxygen"/></a> 1.9.3 </li>
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