code: def _get_ram_usage_mb():
      """Placeholder docstring"""
      return psutil.virtual_memory()[3] / 1000000
  
file_path: sagemaker-python-sdk/src/sagemaker/serve/utils/local_hardware.py
imports: from __future__ import absolute_import
  import subprocess
  import multiprocessing
  import logging
  import shutil
  from math import ceil, floor
  from platform import system
  from pathlib import Path
  import psutil
  from sagemaker import Session
label_desc: Use image node_id 3 for calling a global function with example usage: _get_ram_usage_mb() and returns: unknown