code: def forward(self, inputs, device):
      (x,) = inputs
      return (functions.batch_l2_norm_squared(x),)
  
file_path: chainer/tests/chainer_tests/functions_tests/math_tests/test_batch_l2_norm_squared.py
imports: import unittest
  import numpy
  import six
  import chainer
  from chainer import functions
  from chainer import testing
  from chainer.utils import type_check
label_desc: Use image node_id 3 for calling the TestBatchL2NormSquared obj's underlying member method code with example usage: obj.forward(inputs, device) and returns: functions