message: Change trace.py to not access a graph as a default argument.
  Checks for None and access via default graph inside the function.
diff: @@ -38,7 +38,7 @@ TOKENS = LEFT_TOKENS + RIGHT_TOKENS
  def store_trace_info(output_file_path,
  - graph=ops.get_default_graph(),
  + graph=None,
  ignore_regex_fpaths=None):
  """Collects and stores trace information for a TensorFlow model.
  @@ -51,6 +51,8 @@ def store_trace_info(output_file_path,
  in this list will be ignored. Defaults to patterns that match the core
  tensorflow python library.
  """
  + graph = graph or ops.get_default_graph()
  +
  if not ignore_regex_fpaths:
  ignore_regex_fpaths = TF_LIB_REGEX_FPATHS
  