code: def swish(x):
      """
      Swish activation function.
      """
      return x * torch.sigmoid(x)
  
imports: import copy
  import math
  from collections import OrderedDict
  from typing import Any, Dict, NamedTuple, Optional
  import torch
  import torch.nn
  from classy_vision.generic.util import get_torch_version
  from classy_vision.models import ClassyModel, register_model
label_desc: Use image node_id 1 for calling a global function with example usage: swish(x) and returns: unknown