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why knnsearch function in matlab2016a and 2020b shows different efficiency?

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like this code,in matlab 2020b t1=10s in matlab 2016 a t1=70s,why?is 2020b knnsearch applies parallel programing?
for M=1500*1500:5000:1500*1500
rate_arr_matlab_cpp8t=[];
rate_arr_cpp_cpp8t=[];
a=(randi([-50000,58020],M,2));
b=(randi([-50000,58020],M,2));
tic
[index,dist_min]=knnsearch(a,b,'k',15);
t1=toc;
matlab=[matlab,t3];
end
  2 Comments
俊凯 王
俊凯 王 on 3 Sep 2021
is there apply parallel computing like openmp or something else in 2020b knnsearch function?

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Accepted Answer

Walter Roberson
Walter Roberson on 3 Sep 2021
R2019a release notes specifically mention performance improvements for knnsearch .
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