code: def _sigmoid(x):
      y = torch.clamp(x.sigmoid_(), min=1e-4, max=1 - 1e-4)
      return y
  
file_path: gluon-cv/gluoncv/torch/nn/keypoint_loss.py
imports: import torch
  import torch.nn
label_desc: Use image node_id 1 for calling a global function with example usage: _sigmoid(x) and returns: y