Update duckdb index files

.gitattributes

@@ -53,3 +53,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.jpeg filter=lfs diff=lfs merge=lfs -text
 *.webp filter=lfs diff=lfs merge=lfs -text
 eli5.original-split/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+eli5.original-split/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

eli5.original-split/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f4af41a2aa1f627043e015803eb50e4d6834ecb4d32b2ed8f619e737f3ff9f30
+size 2371584