code: def test_lambda_func_without_args(self):
      class CustomizeModel(tl.models.Model):
          def __init__(self):
              super(CustomizeModel, self).__init__()
              self.dense = tl.layers.Dense(in_channels=1, n_units=5)
              self.lambdalayer = tl.layers.Lambda(lambda x: 2 * x)
  
          def forward(self, x):
              z = self.dense(x)
              zf = self.lambdalayer(z)
              return z, zf
  
      model = CustomizeModel()
      print(model.lambdalayer)
      model.train()
  
      out, out2 = model(self.data_x)
      self.assertTrue(np.array_equal(out2.numpy(), out.numpy() * 2))
  
file_path: TensorLayer/tests/layers/test_layers_lambda.py
imports: import os
  import unittest
  import numpy
  import tensorflow
  import tensorlayer
  from tests.utils import CustomTestCase
label_desc: Use image node_id 6 for calling the Layer_Lambda_Test obj's underlying member method code with example usage: obj.test_lambda_func_without_args() and returns: z,  zf