def encode_lines(self, lines):
        """
        Encode a set of lines. All lines will be encoded together.
        """
        enc_lines = []
        for line in lines:
            line = line.strip()
            if len(line) == 0 and not self.args.keep_empty:
                return ["EMPTY", None]
            tokens = self.encode(line)
            enc_lines.append(" ".join(tokens))
        return ["PASS", enc_lines]

        Encode a set of lines. All lines will be encoded together.
        
understand_icl/fairseq/examples/roberta/multiprocessing_bpe_encoder.py