code: def forward(self, inputs, device):
      c, x = inputs
      c, h = F.lstm(c, x)
      return (
          c,
          h,
      )
  
imports: import unittest
  import numpy
  import six
  from chainer.backends import cuda
  import chainer.functions
  from chainer.functions.rnn import lstm
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import backend
label_desc: Use image node_id 3 for calling the LSTMTestBase obj's underlying member method code with example usage: obj.forward(inputs, device) and returns: c,  h