add type annotations

    def __init__(

            self,

            vocab_file='',

            vocab_file: str='',

            # unk_token="[UNK]",

            # sep_token="[SEP]",

            # pad_token="[PAD]",

class BasicSmilesTokenizer(object):

    """Run basic SMILES tokenization"""

    def __init__(self, regex_pattern=SMI_REGEX_PATTERN):

    def __init__(self, regex_pattern: str=SMI_REGEX_PATTERN):

        """ Constructs a BasicSMILESTokenizer.

        Args:

            **regex**: SMILES token regex

        Parameters

        ----------

        regex: string

            SMILES token regex

        """

        self.regex_pattern = regex_pattern

        self.regex = re.compile(self.regex_pattern)