text: {
      "dataset_reader": {
          "type": "conll2003_ner"
      },
      "train_data_path": "data/ner/eng.train",
      "validation_data_path": "data/ner/eng.testa",
      "test_data_path": "data/ner/eng.testb",
      "evaluate_on_test" : true,
      "model": {
          "type": "tagger",
          "contextualizer": {
              "type": "scalar_mixed_precomputed_contextualizer",
              "representations_path": "contextualizers/elmo_original_randomly_initialized_3/conll2003_ner.hdf5",
              "num_layers": 3
          },
          "token_representation_dim": 1024,
          "calculate_span_f1": true,
          "label_encoding": "IOB1"
      },
      "iterator": {
          "type": "basic",
          "batch_size" : 80
      },
      "trainer": {
          "num_epochs": 50,
          "patience": 3,
          "cuda_device": 0,
          "validation_metric": "+f1-measure-overall",
          "optimizer": {
              "type": "adam",
              "lr": 0.001
          }
      }
  }
  