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POMulti-threaded Simulated Annealing
 

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  1. POMulti-threaded Simulated Annealing
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    <p>I wrote a multithreaded simulated annealing program but its not running. I am not sure if the code is correct or not. The code is able to compile but when i run the code it crashes. Its just a run time error.</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;time.h&gt; #include &lt;iostream&gt; #include &lt;stdlib.h&gt; #include &lt;math.h&gt; #include &lt;string&gt; #include &lt;vector&gt; #include &lt;algorithm&gt; #include &lt;fstream&gt; #include &lt;ctime&gt; #include &lt;windows.h&gt; #include &lt;process.h&gt; using namespace std; typedef vector&lt;double&gt; Layer; //defines a vector type typedef struct { Layer Solution1; double temp1; double coolingrate1; int MCL1; int prob1; }t; //void SA(Layer Solution, double temp, double coolingrate, int MCL, int prob){ double Rand_NormalDistri(double mean, double stddev) { //Random Number from Normal Distribution static double n2 = 0.0; static int n2_cached = 0; if (!n2_cached) { // choose a point x,y in the unit circle uniformly at random double x, y, r; do { // scale two random integers to doubles between -1 and 1 x = 2.0*rand()/RAND_MAX - 1; y = 2.0*rand()/RAND_MAX - 1; r = x*x + y*y; } while (r == 0.0 || r &gt; 1.0); { // Apply Box-Muller transform on x, y double d = sqrt(-2.0*log(r)/r); double n1 = x*d; n2 = y*d; // scale and translate to get desired mean and standard deviation double result = n1*stddev + mean; n2_cached = 1; return result; } } else { n2_cached = 0; return n2*stddev + mean; } } double FitnessFunc(Layer x, int ProbNum) { int i,j,k; double z; double fit = 0; double sumSCH; if(ProbNum==1){ // Ellipsoidal function for(j=0;j&lt; x.size();j++) fit+=((j+1)*(x[j]*x[j])); } else if(ProbNum==2){ // Schwefel's function for(j=0; j&lt; x.size(); j++) { sumSCH=0; for(i=0; i&lt;j; i++) sumSCH += x[i]; fit += sumSCH * sumSCH; } } else if(ProbNum==3){ // Rosenbrock's function for(j=0; j&lt; x.size()-1; j++) fit += 100.0*(x[j]*x[j] - x[j+1])*(x[j]*x[j] - x[j+1]) + (x[j]-1.0)*(x[j]-1.0); } return fit; } double probl(double energychange, double temp){ double a; a= (-energychange)/temp; return double(min(1.0,exp(a))); } int random (int min, int max){ int n = max - min + 1; int remainder = RAND_MAX % n; int x; do{ x = rand(); }while (x &gt;= RAND_MAX - remainder); return min + x % n; } //void SA(Layer Solution, double temp, double coolingrate, int MCL, int prob){ void SA(void *param){ t *args = (t*) param; Layer Solution = args-&gt;Solution1; double temp = args-&gt;temp1; double coolingrate = args-&gt;coolingrate1; int MCL = args-&gt;MCL1; int prob = args-&gt;prob1; double Energy; double EnergyNew; double EnergyChange; Layer SolutionNew(50); Energy = FitnessFunc(Solution, prob); while (temp &gt; 0.01){ for ( int i = 0; i &lt; MCL; i++){ for (int j = 0 ; j &lt; SolutionNew.size(); j++){ SolutionNew[j] = Rand_NormalDistri(5, 1); } EnergyNew = FitnessFunc(SolutionNew, prob); EnergyChange = EnergyNew - Energy; if(EnergyChange &lt;= 0){ Solution = SolutionNew; Energy = EnergyNew; } if(probl(EnergyChange ,temp ) &gt; random(0,1)){ //cout&lt;&lt;SolutionNew[i]&lt;&lt;endl; Solution = SolutionNew; Energy = EnergyNew; cout &lt;&lt; temp &lt;&lt; "=" &lt;&lt; Energy &lt;&lt; endl; } } temp = temp * coolingrate; } } int main () { srand ( time(NULL) ); //seed for getting different numbers each time the prog is run Layer SearchSpace(50); //declare a vector of 20 dimensions //for(int a = 0;a &lt; 10; a++){ for (int i = 0 ; i &lt; SearchSpace.size(); i++){ SearchSpace[i] = Rand_NormalDistri(5, 1); } t *arg1; arg1 = (t *)malloc(sizeof(t)); arg1-&gt;Solution1 = SearchSpace; arg1-&gt;temp1 = 1000; arg1-&gt;coolingrate1 = 0.01; arg1-&gt;MCL1 = 100; arg1-&gt;prob1 = 3; //cout &lt;&lt; "Test " &lt;&lt; ""&lt;&lt;endl; _beginthread( SA, 0, (void*) arg1); Sleep( 100 ); //SA(SearchSpace, 1000, 0.01, 100, 3); //} return 0; } </code></pre> <p>Please help.</p> <p>Thanks Avinesh</p>
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    1. This table or related slice is empty.
    1. USAvinesh Kumar
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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      1. POMulti-threaded Simulated Annealing
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    2. VO
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      1. USAvinesh Kumar
      1. VTFavorite
    1. COWhere does the code crash? (You can see it if you debug it.)
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      1. POMulti-threaded Simulated Annealing
      1. USleemes
    2. COIn addition to using a debugger you have *five* functions that can be _easily_ unit tested.
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      1. USCaptain Obvlious
    3. COWhat type is `t`, anyway?
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      1. USleftaroundabout
 

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