code: def DB_to_amplitude(x: Tensor, ref: float, power: float) -> Tensor:
      r"""Turn a tensor from the decibel scale to the power/amplitude scale.
  
      .. devices:: CPU CUDA
  
      .. properties:: TorchScript
  
      Args:
          x (Tensor): Input tensor before being converted to power/amplitude scale.
          ref (float): Reference which the output will be scaled by.
          power (float): If power equals 1, will compute DB to power. If 0.5, will compute DB to amplitude.
  
      Returns:
          Tensor: Output tensor in power/amplitude scale.
      """
      return ref * torch.pow(torch.pow(10.0, 0.1 * x), power)
  
imports: import math
  import tempfile
  import warnings
  from collections.abc import Sequence
  from typing import List, Optional, Tuple, Union
  import torch
  import torchaudio
  from torch import Tensor
  from torchaudio._internal.module_utils import deprecated
  from .filtering import highpass_biquad, treble_biquad
label_desc: Use image node_id 7 for calling a global function with example usage: DB_to_amplitude(x, ref, power) and returns: unknown