code: def logsigmoid(val):
      max_elem = nd.maximum(0.0, -val)
      z = nd.exp(-max_elem) + nd.exp(-val - max_elem)
      return -(max_elem + nd.log(z))
  
imports: import os
  import numpy
  import mxnet
  from mxnet import gluon
  from mxnet import ndarray
  from .score_fun import *
  from ..None import *
label_desc: Use image node_id 1 for calling a global function with example usage: logsigmoid(val) and returns: unknown