added script to extract imagenet locally from tar files

data/ilsvrc12/extract_locally.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+set -x
+
+if [ $(df -h /scr/ | tail -n1 | py -x 'x.split()[3][:-1]') -le 200 ]; then
+    echo "You need to free up some space first"
+    exit
+fi
+
+tar_dir=/scail/group/deeplearning/sail-deep-gpu/brodyh/data/ILSVRC_2012
+extract_dir=/scr/brodyh/ilsvrc12
+
+# extract training images
+mkdir -p $extract_dir/train
+tar -C $extract_dir/train/ -xvf $tar_dir/ILSVRC2012_img_train.tar
+
+for tar_file in $(ls $extract_dir/train/*tar); do
+    tar_dir=${tar_file%.*}
+    mkdir -p $tar_dir
+    tar -C $tar_dir/ -xf $tar_file
+    rm $tar_file
+done
+
+# extract validation images
+mkdir -p $extract_dir/val
+tar -C $extract_dir/val/ -xvf $tar_dir/ILSVRC2012_img_val.tar