{
  "i": 3,
  "j": 2,
  "shape": [
    108,
    31
  ],
  "columns": [
    "row_id",
    "feature_9",
    "feature_10",
    "feature_11",
    "feature_12",
    "feature_13",
    "feature_14",
    "feature_15",
    "feature_16",
    "feature_17",
    "feature_18",
    "feature_297",
    "feature_4",
    "feature_294",
    "feature_5",
    "feature_295",
    "feature_6",
    "feature_363",
    "feature_7",
    "feature_8",
    "feature_51",
    "feature_19",
    "feature_20",
    "feature_25",
    "feature_26",
    "feature_27",
    "feature_28",
    "feature_29",
    "feature_30",
    "feature_31",
    "feature_32"
  ],
  "artifact_meta": {
    "step": "Compose",
    "uid_col": "row_id",
    "P_row": 3,
    "P_col": 3,
    "i": 3,
    "j": 2,
    "i_pos_1indexed": 3,
    "j_pos_1indexed": 2,
    "T_m_rows": 36,
    "T_m_feature_cols": 10,
    "bench_rows": 108,
    "bench_feature_cols": 30,
    "extra_rows_used": 72,
    "extra_cols_used": 20,
    "top_padding_rows": 72,
    "left_padding_cols": 10,
    "note": "Padding rows/cols preserve original ordering; values retrieved by row_id from full table.",
    "T_bench_shape": [
      108,
      31
    ]
  }
}