class_docstr: Softplus function.
class_docstr_tok: ["Softplus","function","."]
code: def __init__(self, beta=1.0):
      self.beta = float(beta)
      self.beta_inv = float(1.0 / beta)
  
imports: import numpy
  from chainer.backends import cuda
  from chainer import function_node
  import chainer.functions
  from chainer import utils
  from chainer.utils import type_check
label_desc: Use image node_id 1 to create a new Softplus object from inherited base classes: function_node with example: obj = Softplus(beta)