head_config.json

{
  "config": {
    "activation_function": "tanh",
    "head_type": "question_answering",
    "label2id": {
      "LABEL_0": 0,
      "LABEL_1": 1
    },
    "layers": 1,
    "num_labels": 2
  },
  "hidden_size": 768,
  "model_class": "BertModelWithHeads",
  "model_name": "bert-base-uncased",
  "model_type": "bert",
  "name": "squad_v2"
}