code: def _debug_dump_dir(self, run_number=None):
      if run_number is None:
          return self._dump_root
      else:
          return os.path.join(self._dump_root, "run_%d" % run_number)
  
imports: import os
  import tempfile
  from tensorflow.core.protobuf import config_pb2
  from tensorflow.python.client import session
  from tensorflow.python.debug.lib import debug_data
  from tensorflow.python.debug.lib import debug_utils
  from tensorflow.python.debug.lib import session_debug_testlib
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.lib.io import file_io
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import variable_v1
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 2 for calling the SessionDebugFileTest obj's underlying member method code with example usage: obj._debug_dump_dir(run_number) and returns: self, os