empchat/bert_local.py [24:30]:
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        try:
            from pytorch_pretrained_bert import BertModel
        except ImportError:
            raise Exception(
                "BERT rankers needs pytorch-pretrained-BERT installed. "
                "\npip install pytorch-pretrained-bert"
            )
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empchat/datasets/loader.py [49:55]:
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    try:
        from pytorch_pretrained_bert import BertTokenizer
    except ImportError:
        raise Exception(
            "BERT rankers needs pytorch-pretrained-BERT installed. "
            "\npip install pytorch-pretrained-bert"
        )
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