code: def testDecodeInMemoryTrue(self):
      predictions, problem = self.get_predictions()
      decode_hparams = decoding.decode_hparams()
      decode_hparams.decode_in_memory = True
      decode_hooks = decoding.DecodeHookArgs(
          estimator=None,
          problem=problem,
          output_dirs=None,
          hparams=decode_hparams,
          decode_hparams=decode_hparams,
          predictions=predictions,
      )
      metrics = video_utils.summarize_video_metrics(decode_hooks)
  
file_path: tensor2tensor/tensor2tensor/data_generators/video_utils_test.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import parameterized
  import numpy
  from tensor2tensor.data_generators import video_generated
  from tensor2tensor.data_generators import video_utils
  from tensor2tensor.utils import decoding
  from tensor2tensor.utils import registry
  import tensorflow.compat.v1
label_desc: Use image node_id 3 for calling the VideoUtilsTest obj's underlying member method code with example usage: obj.testDecodeInMemoryTrue() without return types