class_docstr: Context manager for writing report file.
code: def __enter__(self):
      return self._report_file
  
imports: import collections
  import hashlib
  import os
  from tensorflow.python.platform import gfile
  from tensorflow.python.platform import tf_logging
  from tensorflow.python.tpu import tensor_tracer_pb2
label_desc: Use image node_id 2 for calling the OpenReportFile obj's underlying member method code with example usage: obj.__enter__() and returns: self