def __contains__(self, key: Union[str, int]) -> bool:
        """Check if a key is in the vectors table.

        key (unicode / int): The key to look up.
        RETURNS (bool): Whether the key is in the table.
        """
        key = self.ensure_int_key(key)
        return key in self.vectors
Check if a key is in the vectors table.

        key (unicode / int): The key to look up.
        RETURNS (bool): Whether the key is in the table.
        
sense2vec/sense2vec.py