code: def forward(self, inputs, device):
      (x,) = inputs
      return (
          functions.decorrelated_batch_normalization(
              x, groups=self.groups, eps=self.eps
          ),
      )
  
imports: import numpy
  from chainer import functions
  from chainer import testing
label_desc: Use image node_id 3 for calling the TestDecorrelatedBatchNormalization obj's underlying member method code with example usage: obj.forward(inputs, device) and returns: functions