code: def get_title(self, context_keys=()):
      original_titles = super().get_title(context_keys=context_keys)
      new_titles = (
          "predicted_length",
          "target_length",
          "topk_tree_predictions",
          "topk_raw_predictions",
          "prediction_score",
          "topk_prediction_scores",
      )
      return (
          original_titles
          + new_titles
          + MaskedCompositionalSeq2SeqFileChannel.SAMPLEWISE_LOSSES
      )
  
imports: from collections import defaultdict
  from typing import Dict, List
  import numpy
  from pytext.common.constants import Stage
  from pytext.data.tensorizers import Tensorizer
  from pytext.metric_reporters.channel import ConsoleChannel
  from pytext.metric_reporters.compositional_metric_reporter import CompositionalMetricReporter
  from pytext.metric_reporters.seq2seq_compositional import CompositionalSeq2SeqFileChannel, Seq2SeqCompositionalMetricReporter
  from pytext.metrics.intent_slot_metrics import FramePredictionPair
  from pytext.metrics.mask_metrics import compute_masked_metrics, compute_nas_masked_metrics
  from .compositional_utils import extract_beam_subtrees, filter_invalid_beams
label_desc: Use image node_id 1 for calling the MaskedCompositionalSeq2SeqFileChannel obj's underlying member method code with example usage: obj.get_title(context_keys) and returns: unknown