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# use 20 threads
cat val4download.txt | xargs -n 2 -P 20 wget -nc -U 'Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.27 Safari/537.17' --timeout=1 --waitretry=0 --tries=5 --retry-connrefused -nv -O
find ../val_image -type f -size -1c -exec rm {} \;
ls -d ../val_image/* | xargs -n 1 -P 20 python check_valid.py | tee val_size_invalid.txt
xargs rm < val_size_invalid.txt
rm val_size_invalid.txt
ls ../val_image > val_valid.txt |