Update duckdb index files

.gitattributes

@@ -57,3 +57,4 @@ test.csv filter=lfs diff=lfs merge=lfs -text
 train.csv filter=lfs diff=lfs merge=lfs -text
 ml4pubmed--pubmed-text-classification-cased/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ml4pubmed--pubmed-text-classification-cased/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+ml4pubmed--pubmed-text-classification-cased/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

ml4pubmed--pubmed-text-classification-cased/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:bc90906744d6384b5d986c717c53bbb98ad9fd2776c331e3ab3fadd528520bcf
+size 777531392