code: def forward_chainerx(self, inputs):
      (out,) = self.forward_xp(inputs, chainerx)
      return (out,)
  
imports: import numpy
  import chainer
  from chainer import functions
  import chainerx
  from chainerx_tests import dtype_utils
  from chainerx_tests import op_utils
label_desc: Use image node_id 3 for calling the LossBase obj's underlying member method code with example usage: obj.forward_chainerx(inputs) and returns: out