code: def test_concat(self):
      func = compile_func(
          [
              self.input_layer1.get_activation_vars(),
              self.input_layer2.get_activation_vars(),
          ],
          self.concat_layer.get_activation_vars(),
      )
      np.testing.assert_allclose(
          func([self.inp1, self.inp2]),
          np.array([[[[1]], [[1]]], [[[2]], [[2]]]]),
      )
  
file_path: deeplift/tests/layers/test_concat.py
imports: from __future__ import division
  from __future__ import print_function
  from __future__ import absolute_import
  import unittest
  from unittest import skip
  import sys
  import os
  import numpy
  import deeplift.layers
  from deeplift.layers import DenseMxtsMode
  from deeplift.util import compile_func
label_desc: Use image node_id 2 for calling the TestConcat obj's underlying member method code with example usage: obj.test_concat() without return types