imagenet sift download

wget http://www.image-net.org/downloads/features/sbow/n02119789.sbow.mat


cat wid.txt |
while read CMD; do
str1='http://www.image-net.org/downloads/features/sbow/'
str2='.sbow.mat'
echo "$CMD"
str3="$str1$CMD$str2"
echo "$str3"
wget "$str3"
done 
            

non-differentiability of the square-root terms

non-differentiability of the square-root terms (and l1 norms) (see Xu et al., ICML 2013)

Given any g(x) > 0, the following holds:

\sqrt(g(x)) = \min_{z>0} \frac{1}{2}[\frac{g(x)}{z}+z].

Then add this auxiliary variable to your cost.