[bert4keras].weights权重文件转换成.ckpt格式,便于build_transformer_model方法加载
方法步骤:建立同样的模型bert=build_transformer_model(config_path,checkpoint_path,model='roformer',application='unilm',with_pool='linear',with_mlm='linear',dropout_rate=0.2,ignore_invalid_weights=True,return_keras