{
  "columns": [
    { "name": "sepal_length", "type": "number" },
    { "name": "sepal_width",  "type": "number" },
    { "name": "petal_length", "type": "number" },
    { "name": "petal_width",  "type": "number" },
    { "name": "class",        "type": "string" }
  ]
}