import json

config = {
    "model_type": "bert",
    "hidden_size": 768,
    "num_attention_heads": 12,
    "num_hidden_layers": 12,
    "vocab_size": 30522,
    "max_position_embeddings": 512
}

with open("config.json", "w") as f:
    json.dump(config, f)