Update duckdb index files

.gitattributes

@@ -1,3 +1,4 @@
 xia111--pdf/imagefolder-train.parquet filter=lfs diff=lfs merge=lfs -text
 xia111--pdf/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/train/0000.parquet 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 sha256:3baaad453de8e07968273d181e4004967d8d21bf09929a185620971b54310b74
+size 75509760