{ "url": "http://localhost:32182/",
  "dest_stream": "/train/matches2",
  "stream": "/train/data",
  "start": 0,
  "end": 100000000,
  "columns": [ { "name": "P1", "index": 0 } ],
  "exemplars": [
      { "name": "a",
        "url": "http://localhost:32182/",
        "stream": "/train/data",
        "start": 1000000,
        "end": 2000000,
        "dest_column": 0,
        "columns": [ { "name": "P1", "index": 0 } ]
      }
  ]
}
