add dataset

dataset/README.md

+#mannual

dataset/download_imagenet2012.sh

+set -e
+if [ "x${IMAGENET_USERNAME}" == x -o "x${IMAGENET_ACCESS_KEY}" == x ];then
+  echo "Please create an account on image-net.org."
+  echo "It will provide you a pair of username and accesskey to download imagenet data."
+  read -p "Username: " IMAGENET_USERNAME
+  read -p "Accesskey: " IMAGENET_ACCESS_KEY
+fi
+
+root_url=http://www.image-net.org/challenges/LSVRC/2012/nnoupb
+valid_tar=ILSVRC2012_img_val.tar
+train_tar=ILSVRC2012_img_train.tar
+train_folder=train/
+valid_folder=val/
+
+echo "Download imagenet training data..."
+mkdir -p ${train_folder}
+wget -nd -c ${root_url}/${train_tar}
+tar xf ${train_tar} -C ${train_folder}
+
+cd ${train_folder}
+for x in `ls *.tar`
+do
+  filename=`basename $x .tar`
+  mkdir -p $filename
+  tar -xf $x -C $filename
+  rm -rf $x
+done
+cd -
+
+echo "Download imagenet validation data..."
+mkdir -p ${valid_folder}
+wget -nd -c ${root_url}/${valid_tar}
+tar xf ${valid_tar} -C ${valid_folder}
+
+echo "Download imagenet label file: val_list.txt & train_list.txt"
+label_file=ImageNet_label.tgz
+label_url=http://paddle-imagenet-models.bj.bcebos.com/${label_file}
+wget -nd -c ${label_url}
+tar zxf ${label_file}
+