Update duckdb index files

.gitattributes

@@ -64,3 +64,4 @@ distribute_nine/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 distribute_nine/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 in_center_single_out_center_single/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 in_center_single_out_center_single/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+in_center_single_out_center_single/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

in_center_single_out_center_single/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:3cfc07b1acd5b38243e09d06ec8f3e57cadb859e15021ef6d47a1934eefc601a
+size 51654656