add unbuffer to run.sh as tee is causing issues

official/recommendation/run.sh

 #!/bin/bash
 set -e
 
+if ! which unbuffer > /dev/null; then
+  echo "Could not find unbuffer command. Make sure the expect package is installed."
+  exit 1
+fi
+
 if [ `id -u` != 0 ]; then
   echo "Calling sudo to gain root for this shell. (Needed to clear caches.)"
   sudo echo "Success"
@@ -55,7 +60,8 @@ do
   # To reduce variation set the seed flag:
   #   --seed ${i}
 
-  python ncf_main.py --model_dir ${MODEL_DIR} \
+  unbuffer python ncf_main.py \
+      --model_dir ${MODEL_DIR} \
       --data_dir ${DATA_DIR} \
       --dataset ${DATASET} --hooks "" \
       ${DEVICE_FLAG} \