Update duckdb index files

.gitattributes

@@ -40,3 +40,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.ogg filter=lfs diff=lfs merge=lfs -text
 *.wav filter=lfs diff=lfs merge=lfs -text
 pre-kowiki-20220620.txt filter=lfs diff=lfs merge=lfs -text
+bongsoo--kowiki20220620/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

bongsoo--kowiki20220620/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:48a5f4d220e01111f0ea77ac5efa8957d29fa1b86e36e6fc156d188de1d115cc
+size 454832128