Update duckdb index files

.gitattributes

@@ -56,3 +56,4 @@ stanford-crfm--DSIR-filtered-pile-50M/validation/index.duckdb filter=lfs diff=lf
 stanford-crfm--DSIR-filtered-pile-50M/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/partial-validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/partial-test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/partial-train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:202e8d0e4bee110203456f247f926e64d3234e8556dc6395e9dda27b6ecb864d
+size 9051844608