    def collater(self, samples, pad_to_length=None):
        """Merge a list of samples to form a mini-batch.
        Args:
            samples (List[dict]): samples to collate
        Returns:
            dict: a mini-batch of data
        """
        return collate(
            samples, self.vocab.pad(), self.eos, self.vocab, pad_to_length=pad_to_length
        )
Merge a list of samples to form a mini-batch.
Args:
samples (List[dict]): samples to collate
Returns:
dict: a mini-batch of data
fairseq/data/denoising_dataset.py