code: def forward(self, inputs, device):
      x, gamma, beta = inputs
      y = functions.layer_normalization(x, gamma, beta, eps=self.eps)
      return (y,)
  
file_path: chainer/tests/chainer_tests/functions_tests/normalization_tests/test_layer_normalization.py
imports: import numpy
  from chainer import functions
  from chainer import testing
label_desc: Use image node_id 4 for calling the TestLayerNormalization obj's underlying member method code with example usage: obj.forward(inputs, device) and returns: y