Removed misc_ops, unused internal module (#1465)

torchaudio/_internal/misc_ops.py

-from typing import Union, Callable
-
-import torch
-from torch import Tensor
-
-
-def normalize_audio(signal: Tensor, normalization: Union[bool, float, Callable]) -> None:
-    """Audio normalization of a tensor in-place.  The normalization can be a bool,
-    a number, or a callable that takes the audio tensor as an input. SoX uses
-    32-bit signed integers internally, thus bool normalizes based on that assumption.
-    """
-
-    if not normalization:
-        return
-
-    if isinstance(normalization, bool):
-        normalization = 1 << 31
-
-    if isinstance(normalization, (float, int)):
-        # normalize with custom value
-        signal /= normalization
-    elif callable(normalization):
-        signal /= normalization(signal)
-
-
-def check_input(src: Tensor) -> None:
-    if not torch.is_tensor(src):
-        raise TypeError('Expected a tensor, got %s' % type(src))
-    if src.is_cuda:
-        raise TypeError('Expected a CPU based tensor, got %s' % type(src))