code: def get_attention(config: AttentionConfig, max_seq_len: int, prefix: str = C.ATTENTION_PREFIX) -> 'Attention':
      
  
      att_cls = Attention.get_attention_cls(config.type)
      params = config.__dict__.copy()
      params.pop('_frozen')
      params['max_seq_len'] = max_seq_len
      params['prefix'] = prefix
      return _instantiate(att_cls, params)
docs: Returns an Attention instance based on attention_type.
  
      :param config: Attention configuration.
      :param max_seq_len: Maximum length of source sequences.
      :param prefix: Name prefix.
      :return: Instance of Attention.