Update duckdb index files

.gitattributes

@@ -28,3 +28,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 train_data.json filter=lfs diff=lfs merge=lfs -text
 validation_data.json filter=lfs diff=lfs merge=lfs -text
 Aihub[[:space:]]Book[[:space:]]Summarization/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+Aihub[[:space:]]Book[[:space:]]Summarization/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

Aihub Book Summarization/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:1b5bc3f4cb1f35c1daed88a99edbc8ce42339e1ab1ecdb424d81c1668421a71c
+size 138686464