code: def stringify_annotation_tree(self, tree_tokens):
      stringified_tree_str = self.tensorizers[
          "trg_seq_tokens"
      ].stringify(tree_tokens)
      return self.get_annotation_from_string(stringified_tree_str)
  
imports: from typing import Dict, List, Optional
  from pytext.common.constants import BatchContext, DatasetFieldName, RawExampleFieldName, Stage
  from pytext.data.data_structures.annotation import Annotation, INVALID_TREE_STR
  from pytext.data.tensorizers import Tensorizer
  from pytext.metric_reporters.channel import Channel, ConsoleChannel
  from pytext.metric_reporters.compositional_metric_reporter import CompositionalMetricReporter
  from pytext.metric_reporters.metric_reporter import MetricReporter
  from pytext.metric_reporters.seq2seq_metric_reporter import Seq2SeqFileChannel, Seq2SeqMetricReporter
  from pytext.metrics.intent_slot_metrics import compute_all_metrics, FramePredictionPair
label_desc: Use image node_id 8 for calling the Seq2SeqCompositionalMetricReporter obj's underlying member method code with example usage: obj.stringify_annotation_tree(tree_tokens) and returns: self