{
  "description": "Split metadata only: groups[row_idx] identifies the sample group; never use as a model feature.",
  "groups": [
    "GB_14",
    "GB_14",
    "GB_14",
    "GB_12",
    "GB_12",
    "GB_12",
    "GB_21",
    "GB_21",
    "GB_21",
    "GB_8",
    "GB_8",
    "GB_8",
    "GB_2",
    "GB_2",
    "GB_2",
    "GB_20",
    "GB_20",
    "GB_20",
    "GB_6",
    "GB_6",
    "GB_6",
    "GB_18",
    "GB_18",
    "GB_18",
    "GB_8",
    "GB_8",
    "GB_8",
    "GB_8",
    "GB_6",
    "GB_6",
    "GB_6",
    "GB_12",
    "GB_12",
    "GB_12",
    "GB_12",
    "GB_21",
    "GB_21",
    "GB_21",
    "GB_23",
    "GB_23",
    "GB_23",
    "GB_4",
    "GB_4",
    "GB_4",
    "GB_11",
    "GB_11",
    "GB_11",
    "GB_5",
    "GB_5",
    "GB_5",
    "GB_5",
    "GB_3",
    "GB_3",
    "GB_3",
    "GB_5",
    "GB_5",
    "GB_5",
    "GB_18",
    "GB_18",
    "GB_18",
    "GB_17",
    "GB_17",
    "GB_17",
    "GB_19",
    "GB_19",
    "GB_19",
    "GB_5",
    "GB_5",
    "GB_5",
    "GB_2",
    "GB_2",
    "GB_2",
    "GB_4",
    "GB_4",
    "GB_4",
    "GB_3",
    "GB_3",
    "GB_3",
    "GB_28",
    "GB_28",
    "GB_28",
    "GB_20",
    "GB_20",
    "GB_20",
    "GB_21",
    "GB_21",
    "GB_21",
    "GB_19",
    "GB_19",
    "GB_19",
    "GB_14",
    "GB_14",
    "GB_14",
    "GB_14",
    "GB_28",
    "GB_28",
    "GB_28",
    "GB_28",
    "GB_13",
    "GB_13",
    "GB_13",
    "GB_10",
    "GB_10",
    "GB_10",
    "GB_24",
    "GB_24",
    "GB_24",
    "GB_17",
    "GB_17",
    "GB_17",
    "GB_19",
    "GB_19",
    "GB_19",
    "GB_3",
    "GB_3",
    "GB_3",
    "GB_15",
    "GB_15",
    "GB_15",
    "GB_7",
    "GB_7",
    "GB_7",
    "GB_22",
    "GB_22",
    "GB_22",
    "GB_18",
    "GB_18",
    "GB_18",
    "GB_25",
    "GB_25",
    "GB_25",
    "GB_4",
    "GB_4",
    "GB_4",
    "GB_10",
    "GB_10",
    "GB_10",
    "GB_20",
    "GB_20",
    "GB_20",
    "GB_22",
    "GB_22",
    "GB_22",
    "GB_22",
    "GB_22",
    "GB_23",
    "GB_23",
    "GB_23",
    "GB_23",
    "GB_15",
    "GB_15",
    "GB_15",
    "GB_15",
    "GB_16",
    "GB_16",
    "GB_16",
    "GB_25",
    "GB_25",
    "GB_25",
    "GB_25",
    "GB_25",
    "GB_25",
    "GB_25",
    "GB_25",
    "GB_28",
    "GB_28",
    "GB_28",
    "GB_28",
    "GB_13",
    "GB_13",
    "GB_13",
    "GB_15",
    "GB_15",
    "GB_15",
    "GB_11",
    "GB_11",
    "GB_11",
    "GB_27",
    "GB_27",
    "GB_27",
    "GB_6",
    "GB_6",
    "GB_6",
    "GB_9",
    "GB_9",
    "GB_9",
    "GB_9",
    "GB_9",
    "GB_9",
    "GB_9",
    "GB_9",
    "GB_11",
    "GB_11",
    "GB_11",
    "GB_11",
    "GB_2",
    "GB_2",
    "GB_2",
    "GB_13",
    "GB_13",
    "GB_13",
    "GB_9",
    "GB_9",
    "GB_9",
    "GB_27",
    "GB_27",
    "GB_27",
    "GB_14",
    "GB_14",
    "GB_14",
    "GB_14",
    "GB_8",
    "GB_8",
    "GB_8",
    "GB_8",
    "GB_7",
    "GB_7",
    "GB_7",
    "GB_12",
    "GB_12",
    "GB_12",
    "GB_23",
    "GB_23",
    "GB_23",
    "GB_24",
    "GB_24",
    "GB_24",
    "GB_1",
    "GB_1",
    "GB_1",
    "GB_1",
    "GB_2",
    "GB_2",
    "GB_2",
    "GB_2",
    "GB_1",
    "GB_1",
    "GB_1",
    "GB_10",
    "GB_10",
    "GB_10",
    "GB_17",
    "GB_17",
    "GB_17",
    "GB_17",
    "GB_7",
    "GB_7",
    "GB_7",
    "GB_24",
    "GB_24",
    "GB_24",
    "GB_24",
    "GB_24",
    "GB_16",
    "GB_16",
    "GB_16",
    "GB_16",
    "GB_16",
    "GB_16",
    "GB_16",
    "GB_22",
    "GB_22",
    "GB_22",
    "GB_22",
    "GB_27",
    "GB_27",
    "GB_27"
  ]
}