code: def forward(self, inputs, device):
      (x,) = inputs
      return (functions.softplus(x, beta=self.beta),)
  
file_path: chainer/tests/chainer_tests/functions_tests/activation_tests/test_softplus.py
imports: import numpy
  from chainer import functions
  from chainer import testing
  from chainer import utils
label_desc: Use image node_id 4 for calling the TestSoftplus obj's underlying member method code with example usage: obj.forward(inputs, device) and returns: functions