code: def _get_total_memory():
      """Gets the total memory in megabytes in this machine."""
      return int(psutil.virtual_memory().total / (1024 * 1024))
  
file_path: deepvariant/deepvariant/resources.py
imports: import platform
  import resource
  import time
  import psutil
  from deepvariant.protos import resources_pb2
label_desc: Use image node_id 4 for calling a global function with example usage: _get_total_memory() and returns: int