code: def check_forward(self, data):
      xs = [chainer.Variable(x) for x in data]
      bxs = functions.broadcast(*xs)
  
      # When len(xs) == 1, function returns a Variable object
      if isinstance(bxs, chainer.Variable):
          bxs = (bxs,)
  
      for bx in bxs:
          self.assertEqual(bx.data.shape, self.out_shape)
          self.assertEqual(bx.data.dtype, self.dtype)
  
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import functions
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
  from chainer.utils import type_check
  import chainerx
label_desc: Use image node_id 2 for calling the TestBroadcast obj's underlying member method code with example usage: obj.check_forward(data) without return types