class_docstr: Implementation of the Profiler wrapper for the legacy autograd profiler:
  the schedule does not exist in this profiler and must be replaced
code: def __enter__(self):
      if self.start_iteration == 0:
          self._enter_actions()
  
imports: import functools
  import logging
  import os
  from contextlib import contextmanager
  from vissl.utils.layer_memory_tracking import null_context
label_desc: Use image node_id 2 for calling the AutoGradProfiler obj's underlying member method code with example usage: obj.__enter__() without return types