code: def test_net1(self):
      # test exceptional cases
      try:
          self.base_layer.build(None)
      except Exception as e:
          print(e)
  
      try:
          self.base_layer.forward(None)
      except Exception as e:
          print(e)
  
      try:
          self.base_layer[4] = 1
      except Exception as e:
          print(e)
  
      try:
          del self.base_layer[4]
      except Exception as e:
          print(e)
  
      try:
          Layer(what=1)
      except Exception as e:
          print(e)
  
file_path: TensorLayer/tests/layers/test_layers_core_basedense_dropout.py
imports: import os
  import unittest
  import numpy
  import tensorflow
  import tensorlayer
  from tensorlayer.layers import *
  from tensorlayer.models import *
  from tests.utils import CustomTestCase
label_desc: Use image node_id 3 for calling the Layer_Core_Test obj's underlying member method code with example usage: obj.test_net1() without return types