code: def generate_params(self):
      C = self.n_channels // self.groups
      # TODO(ecastill) mean and projection are not
      # parameters inside the link, just plain arrays
      mean = numpy.random.uniform(-1, 1, (self.groups, C)).astype(
          self.dtype
      )
      projection = numpy.random.uniform(
          0.5, 1, (self.groups, C, C)
      ).astype(self.dtype)
      return mean, projection
  
imports: import contextlib
  import os
  import tempfile
  import unittest
  import numpy
  import chainer
  from chainer import links
  from chainer import testing
label_desc: Use image node_id 2 for calling the DecorrelatedBatchNormalizationTest obj's underlying member method code with example usage: obj.generate_params() and returns: mean,  projection