{ "train_count": 10000000, "val_count": 500000, "test_count": 500000, "split_format": "hf_parquet_uint16_target_plus_padded_meta_v1", "subset_policy": { "train_prefix_count": 10000000, "val_prefix_count": 500000, "test_prefix_count": 500000 }, "rows_per_file": 32768, "compression": "zstd" }