code: def forward(self, inputs, devices):
      (x,) = inputs
      y = functions.cast(x, self.out_type)
      return (y,)
  
imports: import unittest
  import numpy
  import chainer
  from chainer import functions
  from chainer import testing
  from chainer.testing import attr
  import chainerx
label_desc: Use image node_id 5 for calling the TestCast obj's underlying member method code with example usage: obj.forward(inputs, devices) and returns: y