code: def softplus_activation_constraint(
      net_block, net, layer_block, layer
  ):
      r"""
      Softplus activation constraint generator.
  
      """
      return smooth_monotonic_activation_constraint(
          net_block,
          net,
          layer_block,
          layer,
          softplus_activation_function,
      )
  
imports: from pyomo.environ import exp, log, tanh
label_desc: Use image node_id 4 for calling a global function with example usage: softplus_activation_constraint(net_block, net, layer_block, layer) and returns: smooth_monotonic_activation_constraint