Update duckdb index files

.gitattributes

@@ -95,3 +95,4 @@ stepwise/partial-validation/0002.parquet filter=lfs diff=lfs merge=lfs -text
 gaussian/partial-validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 random/partial-validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 stepwise/partial-validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+stepwise/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text

stepwise/partial-train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:141cb15710df4a5c4e37a90fcf101c4a9571d4005863bea7212bd02651261545
+size 10262425600