Update parquet files

ioclab--grayscale_image_6k/parquet-train-00000-of-00002.parquet

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
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-size 871087690
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+size 871110699

ioclab--grayscale_image_6k/parquet-train-00001-of-00002.parquet

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:eb3a5f86a460d411eebd1bd79c367daed9c546642ee7b8c4f3a5881acb4f2298
-size 433082760
+oid sha256:8b29a0341f189991217cf744514309a8a0667a41b5c6f2b1da2b3d5e2b0b887a
+size 433230470