code: def density_2D(tensor):
      """Kernel-wise sparsity for 4D tensors"""
      return 1 - sparsity_2D(tensor)
  
imports: import argparse
  from collections import OrderedDict
  from copy import deepcopy
  import logging
  import operator
  import random
  import numpy
  import torch
  import torch.nn
  import torch.backends.cudnn
  import yaml
  import inspect
label_desc: Use image node_id 17 for calling a global function with example usage: density_2D(tensor) and returns: unknown