• Python 3.6.8
• PyTorch 1.1.0
• pytorch-crf 0.7.2
• allennlp 1.0.0
• Transformers https://github.com/huggingface/transformers
• CUDA 9.0

Download the pytorch version pre-trained bert-base-uncased model and vocabulary from the link provided by huggingface. Then change the value of parameter --bert_model_dir to the directory of the bert model.