Update duckdb index files

.gitattributes

@@ -59,3 +59,4 @@ KaiLv--UDR_SNLI/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 KaiLv--UDR_SNLI/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/debug/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:52d8edac4cfba989127cb3378e6d59bcad1932f06fa2aed0b93706f5558d105f
+size 26488832