remove useless doc

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}
-