Using parpool instead of matlabpool

[Yili Zhao]

Since matlabpool has been removed from matlab version 2015a, so maybe the code should use parpool instead of matlabpool?

And, can we enhance this block of code with parfor to accelerate feature extraction?

for b = numel(batches):-1:1
    batchResults{b} = get_batch_results(...
        imdb, ...
        imageIds, ...
        batches{b}, ...
        encoder, ...
        opts.maxNumLocalDescriptorsReturned, ...
        opts.dataAugmentation, ...
        opts.scale) ;
end

[tsungyu]

Yes, if you use cpu. As I didn't handle parallel computing using multiple gpus to extract features, you might need to hack the code to support that.

[Yili Zhao]

OK, I will add the necessary code for that.