Added Multiprocessing support to speed up preprocessing #46
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Added the multiprocessing module to leverage available CPU cores for a faster execution. Tested on a 16 core 12th Gen i5 processor with the base preprocess.py script and the multiprocessing enabled script for 3758 images.
Added a command line argument to control CPU core utilization. Inputting a value between 0.1 to 1.0 would allow control over the number of cores used. Default value is 0.5 (50% of the CPU cores).