code: def _dct_transform(dense: Tensor, dim: int) -> Tensor:
      """Should take a tensor and perform a Discrete Cosine Transform on the tensor.
  
      Args:
          dense (Tensor):
              Input dense tensor (no zeros).
          dim (int):
              Which dimension to transform.
      Returns:
          (Tensor):
              transformed dense tensor DCT components
      """
      raise NotImplementedError(
          "Support for DCT has not been implemented yet!"
      )
  
imports: from enum import Enum
  from typing import Optional, Tuple
  import torch
  from torch import Tensor
label_desc: Use image node_id 7 for calling a global function with example usage: _dct_transform(dense, dim) without return types