code: def forward_chainerx(self, inputs):
      (x,) = inputs
      # TODO(aksub99): Improve implementation to avoid non-differentiability
      # wrt targets
      t = self.backend_config.get_array(self.t)
      out = chainerx.sigmoid_cross_entropy(x, t)
      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 TestSigmoidCrossEntropy obj's underlying member method code with example usage: obj.forward_chainerx(inputs) and returns: out