{
    "dataset_reader": {
        "type": "conll2003",
        "coding_scheme": "BIOUL",
        "tag_label": "ner",
        "token_indexers": {
            "bert": {
                "type": "bert-pretrained",
                "do_lowercase": true,
                "pretrained_model": "scibert_scivocab_uncased",
                "use_starting_offsets": true
            },
            "token_characters": {
                "type": "characters",
                "min_padding_length": 3
            }
        }
    },
    "model": {
        "type": "crf_tagger",
        "calculate_span_f1": true,
        "constrain_crf_decoding": true,
        "dropout": 0.5,
        "encoder": {
            "type": "lstm",
            "bidirectional": true,
            "dropout": 0.5,
            "hidden_size": 768,
            "input_size": 896,
            "num_layers": 2
        },
        "include_start_end_transitions": false,
        "label_encoding": "BIOUL",
        "text_field_embedder": {
            "allow_unmatched_keys": true,
            "embedder_to_indexer_map": {
                "bert": ["bert", "bert-offsets"],
                "token_characters": ["token_characters"]
            },
            "token_embedders": {
                "bert": {
                    "type": "bert-pretrained",
                    "pretrained_model": "scibert_scivocab_uncased"
                },
                "token_characters": {
                    "type": "character_encoding",
                    "embedding": {
                        "embedding_dim": 16
                    },
                    "encoder": {
                        "type": "cnn",
                        "conv_layer_activation": "relu",
                        "embedding_dim": 16,
                        "ngram_filter_sizes": [3],
                        "num_filters": 128
                    }
                }
            }
        }
    }
}