def pad(self, docs: List[List[int]]) -> List[List[int]]:
        """
        Vectorize and apply padding on a set of tokenized doucments
        ex: [['hello, 'world'], ['goodbye', 'now']]
        """
        # First apply indexing on all the rows then pad_sequnces (i found this
        # faster than trying to do these steps on each row
        return pad_sequences(docs,
                             maxlen=self.padding_maxlen,
                             dtype=self.padding_dtype,
                             padding=self.padding,
                             truncating=self.truncating,
                             value=self.padding_value)
Vectorize and apply padding on a set of tokenized doucments
        ex: [['hello, 'world'], ['goodbye', 'now']]