code: def test_dtype_config_from_dict(self):
      self.assertEqual(
          DTypeConfig.from_dict(self.dtype_config_dict1_legacy),
          self.dtype_config1,
      )
      self.assertEqual(
          DTypeConfig.from_dict(self.dtype_config_dict2_legacy),
          self.dtype_config2,
      )
      self.assertEqual(
          DTypeConfig.from_dict(self.dtype_config_dict1),
          self.dtype_config1,
      )
      self.assertEqual(
          DTypeConfig.from_dict(self.dtype_config_dict2),
          self.dtype_config2,
      )
      self.assertEqual(
          DTypeConfig.from_dict(self.dtype_config_dict3),
          self.dtype_config3,
      )
  
imports: import torch
  import torch.ao.nn.intrinsic
  import torch.ao.nn.qat
  import torch.ao.nn.quantized.reference
  from torch.testing._internal.common_quantization import QuantizationTestCase
  from torch.ao.quantization.backend_config import BackendConfig, BackendPatternConfig, DTypeConfig, DTypeWithConstraints, ObservationType
  from torch.ao.quantization.fuser_method_mappings import _sequential_wrapper2
  from torch.ao.quantization.fx.quantize_handler import _default_root_node_getter
label_desc: Use image node_id 1 for calling the TestBackendConfig obj's underlying member method code with example usage: obj.test_dtype_config_from_dict() without return types