{
  "datasetType": "TF",
  "numRows": 10,
  "columns": {
    "image": {
      "type": "uint8",
      "rank": 3,
      "shape": [3, 4, 2],
      "t_impl": "cvmat"
    },
    "label" : {
      "type": "int64",
      "rank": 1,
      "t_impl": "flex"        
    }
  }
}