code: def test_failed_loading_mode_for_storage(self):
      network = layers.Input(2) >> layers.Sigmoid(1)
  
      with self.assertRaisesRegexp(ValueError, "Invalid value"):
          storage.load_dict(network, {}, load_by="unknown")
  
imports: import copy
  import numpy
  from neupy.utils import asfloat
  from neupy import layers, storage
  from neupy.storage import validate_data_structure, InvalidFormat, ParameterLoaderError, load_layer_parameter
  from base import BaseTestCase
label_desc: Use image node_id 6 for calling the DictStorageTestCase obj's underlying member method code with example usage: obj.test_failed_loading_mode_for_storage() without return types