code: def medicalnet_intensity_normalisation(volume):
      """Based on https://github.com/Tencent/MedicalNet/blob/18c8bb6cd564eb1b964bffef1f4c2283f1ae6e7b/datasets/brains18.py#L133"""
      mean = volume.mean()
      std = volume.std()
      return (volume - mean) / std
  
imports: from __future__ import annotations
  import warnings
  import torch
  import torch.nn
  from monai.utils import optional_import
  from monai.utils.enums import StrEnum
label_desc: Use image node_id 3 for calling a global function with example usage: medicalnet_intensity_normalisation(volume) and returns: unknown