Merge pull request #37 from articuno12/master

norvig · web-flow · commit ee20b9bd0da9 · 2017-03-02T20:40:47.000-08:00
Modification in alpha-beta search , bfs,online dfs and mini max search #26 #27 #28 #3
diff --git a/md/Alpha-Beta-Search.md b/md/Alpha-Beta-Search.md
@@ -10,7 +10,7 @@ __function__ MAX\-VALUE(_state_, _&alpha;_, _&beta;_) __returns__ _a utility val
 &emsp;__if__ TERMINAL\-TEST(_state_) __the return__ UTILITY(_state_)  
 &emsp;_v_ &larr; &minus;&infin;  
 &emsp;__for each__ _a_ __in__ ACTIONS(_state_) __do__  
-&emsp;&emsp;&emsp;_v_ &larr; MAX(_v_, MIN\-VALUE(RESULT(_s_, _a_), _&alpha;_, _&beta;_))  
+&emsp;&emsp;&emsp;_v_ &larr; MAX(_v_, MIN\-VALUE(RESULT(_state_, _a_), _&alpha;_, _&beta;_))  
 &emsp;&emsp;&emsp;__if__ _v_ &ge; _&beta;_ __then return__ _v_  
 &emsp;&emsp;&emsp;_&alpha;_ &larr; MAX(_&alpha;_, _v_)  
 &emsp;__return__ _v_  
@@ -20,7 +20,7 @@ __function__ MIN\-VALUE(_state_, _&alpha;_, _&beta;_) __returns__ _a utility val
 &emsp;__if__ TERMINAL\-TEST(_state_) __the return__ UTILITY(_state_)  
 &emsp;_v_ &larr; &plus;&infin;  
 &emsp;__for each__ _a_ __in__ ACTIONS(_state_) __do__  
-&emsp;&emsp;&emsp;_v_ &larr; MIN(_v_, MAX\-VALUE(RESULT(_s_, _a_), _&alpha;_, _&beta;_))  
+&emsp;&emsp;&emsp;_v_ &larr; MIN(_v_, MAX\-VALUE(RESULT(_state_, _a_), _&alpha;_, _&beta;_))  
 &emsp;&emsp;&emsp;__if__ _v_ &le; _&alpha;_ __then return__ _v_  
 &emsp;&emsp;&emsp;_&beta;_ &larr; MIN(_&beta;_ _v_)  
 &emsp;__return__ _v_  
diff --git a/md/Breadth-First-Search.md b/md/Breadth-First-Search.md
@@ -2,7 +2,7 @@
 
 ## AIMA3e
 __function__ BREADTH-FIRST-SEARCH(_problem_) __returns__ a solution, or failure  
-&emsp;_node_ &larr; a node with STATE = _problem_.INITIAL\-STATE, PATH\-COST = 0  
+&emsp;_node_ &larr; a node with STATE = _problem_.INITIAL\-STATE 
 &emsp;__if__ _problem_.GOAL\-TEST(_node_.STATE) __then return__ SOLUTION(_node_)  
 &emsp;_frontier_ &larr; a FIFO queue with _node_ as the only element  
 &emsp;_explored_ &larr; an empty set  
diff --git a/md/Minimax-Decision.md b/md/Minimax-Decision.md
@@ -9,15 +9,15 @@ __function__ MAX\-VALUE(_state_) __returns__ _a utility value_
 &emsp;__if__ TERMINAL\-TEST(_state_) __the return__ UTILITY(_state_)  
 &emsp;_v_ &larr; &minus;&infin;  
 &emsp;__for each__ _a_ __in__ ACTIONS(_state_) __do__  
-&emsp;&emsp;&emsp;_v_ &larr; MAX(_v_, MIN\-VALUE(RESULT(_s_, _a_)))  
+&emsp;&emsp;&emsp;_v_ &larr; MAX(_v_, MIN\-VALUE(RESULT(_state_, _a_)))  
 &emsp;__return__ _v_  
 
 ---
 __function__ MIN\-VALUE(_state_) __returns__ _a utility value_  
 &emsp;__if__ TERMINAL\-TEST(_state_) __the return__ UTILITY(_state_)  
 &emsp;_v_ &larr; &infin;  
 &emsp;__for each__ _a_ __in__ ACTIONS(_state_) __do__  
-&emsp;&emsp;&emsp;_v_ &larr; MIN(_v_, MAX\-VALUE(RESULT(_s_, _a_)))  
+&emsp;&emsp;&emsp;_v_ &larr; MIN(_v_, MAX\-VALUE(RESULT(_state_, _a_)))  
 &emsp;__return__ _v_  
 
 ---
diff --git a/md/Online-DFS-Agent.md b/md/Online-DFS-Agent.md
@@ -10,7 +10,7 @@ __function__ ONLINE-DFS-AGENT(_s'_) __returns__ an action
 
 &emsp;__if__ GOAL\-TEST(_s'_) __then return__ _stop_  
 &emsp;__if__ _s'_ is a new state (not in _untried_) __then__ _untried_\[_s'_\] &larr; ACTIONS(_s'_)  
-&emsp;__if__ _s_ is not null __then__  
+&emsp;__if__ _s_ is not null and _s'_ != _result_\[_s_, _a_\] __then__  
 &emsp;&emsp;&emsp;_result_\[_s_, _a_\] &larr; _s'_  
 &emsp;&emsp;&emsp;add _s_ to front of _unbacktracked_\[_s'_\]  
 &emsp;__if__ _untried_\[_s'_\] is empty __then__  
