add downloading vcr script

scripts/download_vcr.sh

@@ -0,0 +1,34 @@
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT license.
+
+DOWNLOAD=$1
+
+for FOLDER in 'img_db' 'txt_db' 'pretrained' 'finetune'; do
+    if [ ! -d $DOWNLOAD/$FOLDER ] ; then
+        mkdir -p $DOWNLOAD/$FOLDER
+    fi
+done
+
+BLOB='https://convaisharables.blob.core.windows.net/uniter'
+
+# image dbs
+for SPLIT in 'train' 'val' 'test' 'gt_train' 'gt_val' 'gt_test'; do
+    if [ ! -d $DOWNLOAD/img_db/vcr_$SPLIT ] ; then
+        wget $BLOB/img_db/vcr_$SPLIT.tar -P $DOWNLOAD/img_db/
+        tar -xvf $DOWNLOAD/img_db/vcr_$SPLIT.tar -C $DOWNLOAD/img_db
+    fi
+done
+
+# text dbs
+for SPLIT in 'train' 'val' 'test'; do
+    wget $BLOB/txt_db/vcr_$SPLIT.db.tar -P $DOWNLOAD/txt_db/
+    tar -xvf $DOWNLOAD/txt_db/vcr_$SPLIT.db.tar -C $DOWNLOAD/txt_db
+done
+
+if [ ! -f $DOWNLOAD/pretrained/uniter-large-vcr_2nd_stage.pt ] ; then
+    wget $BLOB/pretrained/uniter-large-vcr_2nd_stage.pt -P $DOWNLOAD/pretrained/
+fi
+
+if [ ! -f $DOWNLOAD/pretrained/uniter-base-vcr_2nd_stage.pt ] ; then
+    wget $BLOB/pretrained/uniter-base-vcr_2nd_stage.pt -P $DOWNLOAD/pretrained/
+fi