def reduce(x: torch.Tensor, operation: str, reduced_axes: List[int]):
if operation == 'min':
return x.amin(dim=reduced_axes)
elif operation == 'max':
return x.amax(dim=reduced_axes)
elif operation == 'sum':
return x.sum(dim=reduced_axes)
elif operation == 'mean':
return x.mean(dim=reduced_axes)
elif operation == 'prod':
for i in list(sorted(reduced_axes))[::-1]:
x = x.prod(dim=i)
return x
else:
raise NotImplementedError('Unknown reduction ', operation)
def clamp_normalize(
inputs: Tensor,
minimum: float = float("-inf"),
maximum: float = float("inf"),
norm_min: float = 0.0,
norm_max: float = 1.0,
inplace: bool = True,
eps: float = 1e-8,
) -> Tensor:
if maximum <= minimum:
raise ValueError(
f"Expected maximum > minimum: got {maximum} vs {minimum}")
if norm_max <= norm_min:
raise ValueError(
f"Expected norm_max > norm_min: got {norm_max} vs {norm_min}")
if eps <= 0:
raise ValueError(f"Expected eps > 0: got {eps}")
if not inputs.is_floating_point():
inputs = inputs.float()
minimum = float(minimum) if minimum != float("-inf") else float(
inputs.amin().item())
maximum = float(maximum) if maximum != float("inf") else float(
inputs.amax().item())
delta = max(maximum - minimum, eps)
output_delta = norm_max - norm_min
assert output_delta > 0
if inplace:
outputs = inputs.clamp_(minimum, maximum).sub_(minimum).div_(delta)
else:
outputs = inputs.clamp(minimum, maximum).sub(minimum).div(delta)
# only apply renormalization if necessary
if norm_min != 0 or norm_max != 1:
if inplace:
outputs = outputs.mul_(output_delta).add_(norm_min)
else:
outputs = outputs.mul(output_delta).add(norm_min)
return outputs
def autocontrast(img: Tensor) -> Tensor:
_assert_image_tensor(img)
if img.ndim < 3:
raise TypeError(f"Input image tensor should have at least 3 dimensions, but found {img.ndim}")
_assert_channels(img, [1, 3])
bound = 1.0 if img.is_floating_point() else 255.0
dtype = img.dtype if torch.is_floating_point(img) else torch.float32
minimum = img.amin(dim=(-2, -1), keepdim=True).to(dtype)
maximum = img.amax(dim=(-2, -1), keepdim=True).to(dtype)
scale = bound / (maximum - minimum)
eq_idxs = torch.isfinite(scale).logical_not()
minimum[eq_idxs] = 0
scale[eq_idxs] = 1
return ((img - minimum) * scale).clamp(0, bound).to(img.dtype)
def autocontrast(img: Tensor) -> Tensor:
_assert_image_tensor(img)
if img.ndim < 3:
raise TypeError("Input image tensor should have at least 3 dimensions, but found {}".format(img.ndim))
_assert_channels(img, [1, 3])
bound = 1.0 if img.is_floating_point() else 255.0
dtype = img.dtype if torch.is_floating_point(img) else torch.float32
minimum = img.amin(dim=(-2, -1), keepdim=True).to(dtype)
maximum = img.amax(dim=(-2, -1), keepdim=True).to(dtype)
eq_idxs = torch.where(minimum == maximum)[0]
minimum[eq_idxs] = 0
maximum[eq_idxs] = bound
scale = bound / (maximum - minimum)
return ((img - minimum) * scale).clamp(0, bound).to(img.dtype)
