code: def forward(self, inputs, device):
      (x,) = inputs
      r = self.r.astype(x.dtype)
      r = device.send(r)
      with chainer.using_config("train", self.train):
          y = functions.rrelu(x, l=self.l, u=self.u, r=r)
      return (y,)
  
file_path: chainer/tests/chainer_tests/functions_tests/activation_tests/test_rrelu.py
imports: import unittest
  import numpy
  import chainer
  from chainer import cuda
  from chainer import functions
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 3 for calling the TestRReLU obj's underlying member method code with example usage: obj.forward(inputs, device) and returns: y