text: """
   Copyright (c) 2021 Intel Corporation
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at
        http://www.apache.org/licenses/LICENSE-2.0
   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
  """
  
  from abc import abstractmethod
  from typing import TypeVar, List, Optional
  
  TensorType = TypeVar('TensorType')
  DeviceType = TypeVar('DeviceType')
  
  
  class NNCFTensor:
      """
      An interface of framework specific tensors for common NNCF algorithms.
      """
  
      def __init__(self, tensor: Optional[TensorType]):
          self._tensor = tensor
  
      @property
      def tensor(self) -> TensorType:
          return self._tensor
  
      @property
      def shape(self) -> List[int]:
          if self._tensor is None:
              raise RuntimeError('Attempt to get shape of empty NNCFTensor')
          return self._tensor.shape
  
      @property
      @abstractmethod
      def device(self) -> DeviceType:
          pass
  