    def convert_tokens_to_string(self, tokens):
        """
        Converts a sequence of tokens (list of string) to a single string by
        using ``' '.join(tokens)`` .

        Args:
            tokens (list[str]): A sequence of tokens.

        Returns:
            str: Converted string.
        """
        return " ".join(tokens)
Converts a sequence of tokens (list of string) to a single string by
using ``' '.join(tokens)`` .

Args:
tokens (list[str]): A sequence of tokens.

Returns:
str: Converted string.
ptstructure/vqa/pytorchnlp/transformers/tokenizer_utils.py