import tensorflow as tf

            "input_ids": tf.FixedLenFeature([max_seq_length], tf.int64),
            "input_mask": tf.FixedLenFeature([max_seq_length], tf.int64),
            "segment_ids": tf.FixedLenFeature([max_seq_length], tf.int64),
            "masked_lm_positions": tf.FixedLenFeature(
                [max_predictions_per_seq], tf.int64
            ),
            "masked_lm_ids": tf.FixedLenFeature([max_predictions_per_seq], tf.int64),
            "masked_lm_weights": tf.FixedLenFeature(
                [max_predictions_per_seq], tf.float32
            ),
            "next_sentence_labels": tf.FixedLenFeature([1], tf.int64),
        }
