def forward(
self,
batch_shape: torch.Size,
same_on_batch: bool = False) -> Dict[str, Tensor]: # type:ignore
batch_size = batch_shape[0]
_common_param_check(batch_size, same_on_batch)
_device, _dtype = _extract_device_dtype(
[self.brightness, self.contrast, self.hue, self.saturation])
brightness_factor = _adapted_rsampling(
(batch_size, ), self.brightness_sampler, same_on_batch)
contrast_factor = _adapted_rsampling(
(batch_size, ), self.contrast_sampler, same_on_batch)
hue_factor = _adapted_rsampling((batch_size, ), self.hue_sampler,
same_on_batch)
saturation_factor = _adapted_rsampling(
(batch_size, ), self.saturation_sampler, same_on_batch)
return dict(
brightness_factor=brightness_factor.to(device=_device,
dtype=_dtype),
contrast_factor=contrast_factor.to(device=_device, dtype=_dtype),
hue_factor=hue_factor.to(device=_device, dtype=_dtype),
saturation_factor=saturation_factor.to(device=_device,
dtype=_dtype),
order=self.randperm(4).to(device=_device, dtype=_dtype).long(),
)
def forward(self, batch_shape: torch.Size, same_on_batch: bool = False) -> Dict[str, torch.Tensor]: # type:ignore
batch_size = batch_shape[0]
height = batch_shape[-2]
width = batch_shape[-1]
_device, _dtype = _extract_device_dtype([self.distortion_scale])
_common_param_check(batch_size, same_on_batch)
if not (type(height) is int and height > 0 and type(width) is int and width > 0):
raise AssertionError(f"'height' and 'width' must be integers. Got {height}, {width}.")
start_points: torch.Tensor = torch.tensor(
[[[0.0, 0], [width - 1, 0], [width - 1, height - 1], [0, height - 1]]], device=_device, dtype=_dtype
).expand(batch_size, -1, -1)
# generate random offset not larger than half of the image
fx = self._distortion_scale * width / 2
fy = self._distortion_scale * height / 2
factor = torch.stack([fx, fy], dim=0).view(-1, 1, 2).to(device=_device, dtype=_dtype)
# TODO: This line somehow breaks the gradcheck
rand_val: torch.Tensor = _adapted_rsampling(start_points.shape, self.rand_val_sampler, same_on_batch).to(
device=_device, dtype=_dtype
)
if self.sampling_method == "basic":
pts_norm = torch.tensor([[[1, 1], [-1, 1], [-1, -1], [1, -1]]], device=_device, dtype=_dtype)
offset = factor * rand_val * pts_norm
elif self.sampling_method == "area_preserving":
offset = 2 * factor * (rand_val - 0.5)
end_points = start_points + offset
return dict(start_points=start_points, end_points=end_points)
def forward(self, batch_shape: torch.Size, same_on_batch: bool =
False) -> Dict[str, torch.Tensor]:
batch_size = batch_shape[0]
_common_param_check(batch_size, same_on_batch)
pl_idx = _adapted_rsampling((batch_size,),
self.pl_idx_dist,
same_on_batch)
return dict(idx=pl_idx.long())
def forward(self, batch_shape: torch.Size, same_on_batch: bool = False) -> Dict[str, torch.Tensor]: # type:ignore
batch_size = batch_shape[0]
_common_param_check(batch_size, same_on_batch)
# self.ksize_factor.expand((batch_size, -1))
_device, _dtype = _extract_device_dtype([self.angle, self.direction])
yaw_factor = _adapted_rsampling((batch_size,), self.yaw_sampler, same_on_batch)
pitch_factor = _adapted_rsampling((batch_size,), self.pitch_sampler, same_on_batch)
roll_factor = _adapted_rsampling((batch_size,), self.roll_sampler, same_on_batch)
angle_factor = torch.stack([yaw_factor, pitch_factor, roll_factor], dim=1)
direction_factor = _adapted_rsampling((batch_size,), self.direction_sampler, same_on_batch)
ksize_factor = _adapted_rsampling((batch_size,), self.ksize_sampler, same_on_batch).int() * 2 + 1
return dict(
ksize_factor=ksize_factor.to(device=_device, dtype=torch.int32),
angle_factor=angle_factor.to(device=_device, dtype=_dtype),
direction_factor=direction_factor.to(device=_device, dtype=_dtype),
)
def forward(
self,
batch_shape: torch.Size,
same_on_batch: bool = False
) -> Dict[str, torch.Tensor]: # type:ignore
batch_size = batch_shape[0]
_common_param_check(batch_size, same_on_batch)
_device, _dtype = _extract_device_dtype([self.degrees])
return dict(
yaw=_adapted_rsampling((batch_size, ), self.yaw_sampler,
same_on_batch).to(device=_device,
dtype=_dtype),
pitch=_adapted_rsampling((batch_size, ), self.pitch_sampler,
same_on_batch).to(device=_device,
dtype=_dtype),
roll=_adapted_rsampling((batch_size, ), self.roll_sampler,
same_on_batch).to(device=_device,
dtype=_dtype),
)
def forward(
self,
batch_shape: torch.Size,
same_on_batch: bool = False
) -> Dict[str, torch.Tensor]: # type:ignore
batch_size = batch_shape[0]
depth = batch_shape[-3]
height = batch_shape[-2]
width = batch_shape[-1]
_common_param_check(batch_size, same_on_batch)
_device, _dtype = _extract_device_dtype([self.distortion_scale])
start_points: torch.Tensor = torch.tensor(
[[
[0.0, 0, 0],
[width - 1, 0, 0],
[width - 1, height - 1, 0],
[0, height - 1, 0],
[0.0, 0, depth - 1],
[width - 1, 0, depth - 1],
[width - 1, height - 1, depth - 1],
[0, height - 1, depth - 1],
]],
device=_device,
dtype=_dtype,
).expand(batch_size, -1, -1)
# generate random offset not larger than half of the image
fx = self._distortion_scale * width / 2
fy = self._distortion_scale * height / 2
fz = self._distortion_scale * depth / 2
factor = torch.stack([fx, fy, fz], dim=0).view(-1, 1,
3).to(device=_device,
dtype=_dtype)
rand_val: torch.Tensor = _adapted_rsampling(
start_points.shape, self.rand_sampler,
same_on_batch).to(device=_device, dtype=_dtype)
pts_norm = torch.tensor(
[[[1, 1, 1], [-1, 1, 1], [-1, -1, 1], [1, -1, 1], [1, 1, -1],
[-1, 1, -1], [-1, -1, -1], [1, -1, -1]]],
device=_device,
dtype=_dtype,
)
end_points = start_points + factor * rand_val * pts_norm
return dict(start_points=start_points, end_points=end_points)
def forward(
self,
batch_shape: torch.Size,
same_on_batch: bool = False
) -> Dict[str, torch.Tensor]: # type:ignore
batch_size = batch_shape[0]
_common_param_check(batch_size, same_on_batch)
_device, _dtype = _extract_device_dtype(
[t for t, _, _, _ in self.samplers])
return {
name: _adapted_rsampling((batch_size, ), dist,
same_on_batch).to(device=_device,
dtype=_dtype)
for name, dist in self.sampler_dict.items()
}
def forward(self,
batch_shape: torch.Size,
same_on_batch: bool = False) -> Dict[str, torch.Tensor]:
batch_size = batch_shape[0]
_common_param_check(batch_size, same_on_batch)
_device, _dtype = _extract_device_dtype([self.lambda_val])
with torch.no_grad():
batch_probs: torch.Tensor = _adapted_sampling(
(batch_size, ), self.prob_sampler, same_on_batch)
mixup_pairs: torch.Tensor = torch.randperm(batch_size,
device=_device,
dtype=_dtype).long()
mixup_lambdas: torch.Tensor = _adapted_rsampling(
(batch_size, ), self.lambda_sampler, same_on_batch)
mixup_lambdas = mixup_lambdas * batch_probs
return dict(
mixup_pairs=mixup_pairs.to(device=_device, dtype=torch.long),
mixup_lambdas=mixup_lambdas.to(device=_device, dtype=_dtype),
)
def forward(self,
batch_shape: torch.Size,
same_on_batch: bool = False) -> Dict[str, torch.Tensor]:
batch_size = batch_shape[0]
depth = batch_shape[-3]
height = batch_shape[-2]
width = batch_shape[-1]
if not (type(depth) is int and depth > 0 and type(height) is int
and height > 0 and type(width) is int and width > 0):
raise AssertionError(
f"'depth', 'height' and 'width' must be integers. Got {depth}, {height}, {width}."
)
_device, _dtype = _extract_device_dtype(
[self.degrees, self.translate, self.scale, self.shears])
# degrees = degrees.to(device=device, dtype=dtype)
yaw = _adapted_rsampling((batch_size, ), self.yaw_sampler,
same_on_batch)
pitch = _adapted_rsampling((batch_size, ), self.pitch_sampler,
same_on_batch)
roll = _adapted_rsampling((batch_size, ), self.roll_sampler,
same_on_batch)
angles = torch.stack([yaw, pitch, roll], dim=1)
# compute tensor ranges
if self._scale is not None:
scale = torch.stack(
[
_adapted_rsampling(
(batch_size, ), self.scale_1_sampler, same_on_batch),
_adapted_rsampling(
(batch_size, ), self.scale_2_sampler, same_on_batch),
_adapted_rsampling(
(batch_size, ), self.scale_3_sampler, same_on_batch),
],
dim=1,
)
else:
scale = torch.ones(batch_size, device=_device,
dtype=_dtype).reshape(batch_size,
1).repeat(1, 3)
if self._translate is not None:
max_dx: torch.Tensor = self._translate[0] * width
max_dy: torch.Tensor = self._translate[1] * height
max_dz: torch.Tensor = self._translate[2] * depth
# translations should be in x,y,z
translations = torch.stack(
[
(_adapted_rsampling(
(batch_size, ), self.uniform_sampler, same_on_batch) -
0.5) * max_dx * 2,
(_adapted_rsampling(
(batch_size, ), self.uniform_sampler, same_on_batch) -
0.5) * max_dy * 2,
(_adapted_rsampling(
(batch_size, ), self.uniform_sampler, same_on_batch) -
0.5) * max_dz * 2,
],
dim=1,
)
else:
translations = torch.zeros((batch_size, 3),
device=_device,
dtype=_dtype)
# center should be in x,y,z
center: torch.Tensor = torch.tensor(
[width, height, depth], device=_device, dtype=_dtype).view(
1, 3) / 2.0 - 0.5
center = center.expand(batch_size, -1)
if self.shears is not None:
sxy = _adapted_rsampling((batch_size, ), self.sxy_sampler,
same_on_batch)
sxz = _adapted_rsampling((batch_size, ), self.sxz_sampler,
same_on_batch)
syx = _adapted_rsampling((batch_size, ), self.syx_sampler,
same_on_batch)
syz = _adapted_rsampling((batch_size, ), self.syz_sampler,
same_on_batch)
szx = _adapted_rsampling((batch_size, ), self.szx_sampler,
same_on_batch)
szy = _adapted_rsampling((batch_size, ), self.szy_sampler,
same_on_batch)
else:
sxy = sxz = syx = syz = szx = szy = torch.tensor([0] * batch_size,
device=_device,
dtype=_dtype)
return dict(
translations=torch.as_tensor(translations,
device=_device,
dtype=_dtype),
center=torch.as_tensor(center, device=_device, dtype=_dtype),
scale=torch.as_tensor(scale, device=_device, dtype=_dtype),
angles=torch.as_tensor(angles, device=_device, dtype=_dtype),
sxy=torch.as_tensor(sxy, device=_device, dtype=_dtype),
sxz=torch.as_tensor(sxz, device=_device, dtype=_dtype),
syx=torch.as_tensor(syx, device=_device, dtype=_dtype),
syz=torch.as_tensor(syz, device=_device, dtype=_dtype),
szx=torch.as_tensor(szx, device=_device, dtype=_dtype),
szy=torch.as_tensor(szy, device=_device, dtype=_dtype),
)
def forward(self,
batch_shape: torch.Size,
same_on_batch: bool = False) -> Dict[str, torch.Tensor]:
batch_size = batch_shape[0]
height = batch_shape[-2]
width = batch_shape[-1]
if not (type(height) is int and height > 0 and type(width) is int
and width > 0):
raise AssertionError(
f"'height' and 'width' must be integers. Got {height}, {width}."
)
_device, _dtype = _extract_device_dtype([self.beta, self.cut_size])
_common_param_check(batch_size, same_on_batch)
if batch_size == 0:
return dict(
mix_pairs=torch.zeros([0, 3], device=_device,
dtype=torch.long),
crop_src=torch.zeros([0, 4, 2],
device=_device,
dtype=torch.long),
)
with torch.no_grad():
batch_probs: torch.Tensor = _adapted_sampling(
(batch_size * self.num_mix, ), self.prob_sampler,
same_on_batch)
mix_pairs: torch.Tensor = torch.rand(self.num_mix,
batch_size,
device=_device,
dtype=_dtype).argsort(dim=1)
cutmix_betas: torch.Tensor = _adapted_rsampling(
(batch_size * self.num_mix, ), self.beta_sampler, same_on_batch)
# Note: torch.clamp does not accept tensor, cutmix_betas.clamp(cut_size[0], cut_size[1]) throws:
# Argument 1 to "clamp" of "_TensorBase" has incompatible type "Tensor"; expected "float"
cutmix_betas = torch.min(torch.max(cutmix_betas, self._cut_size[0]),
self._cut_size[1])
cutmix_rate = torch.sqrt(1.0 - cutmix_betas) * batch_probs
cut_height = (cutmix_rate * height).floor().to(device=_device,
dtype=_dtype)
cut_width = (cutmix_rate * width).floor().to(device=_device,
dtype=_dtype)
_gen_shape = (1, )
if same_on_batch:
_gen_shape = (cut_height.size(0), )
cut_height = cut_height[0]
cut_width = cut_width[0]
# Reserve at least 1 pixel for cropping.
x_start: torch.Tensor = _adapted_rsampling(
_gen_shape, self.rand_sampler,
same_on_batch) * (width - cut_width - 1)
y_start: torch.Tensor = _adapted_rsampling(
_gen_shape, self.rand_sampler,
same_on_batch) * (height - cut_height - 1)
x_start = x_start.floor().to(device=_device, dtype=_dtype)
y_start = y_start.floor().to(device=_device, dtype=_dtype)
crop_src = bbox_generator(x_start.squeeze(), y_start.squeeze(),
cut_width, cut_height)
# (B * num_mix, 4, 2) => (num_mix, batch_size, 4, 2)
crop_src = crop_src.view(self.num_mix, batch_size, 4, 2)
return dict(
mix_pairs=mix_pairs.to(device=_device, dtype=torch.long),
crop_src=crop_src.floor().to(device=_device, dtype=_dtype),
)
def forward(self, batch_shape: torch.Size, same_on_batch: bool = False) -> Dict[str, torch.Tensor]: # type:ignore
batch_size = batch_shape[0]
_common_param_check(batch_size, same_on_batch)
_device, _ = _extract_device_dtype([self.bits if isinstance(self.bits, torch.Tensor) else None])
bits_factor = _adapted_rsampling((batch_size,), self.bit_sampler, same_on_batch)
return dict(bits_factor=bits_factor.to(device=_device, dtype=torch.int32))
def forward(
self,
batch_shape: torch.Size,
same_on_batch: bool = False
) -> Dict[str, torch.Tensor]: # type:ignore
batch_size = batch_shape[0]
height = batch_shape[-2]
width = batch_shape[-1]
if not (type(height) is int and height > 0 and type(width) is int
and width > 0):
raise AssertionError(
f"'height' and 'width' must be integers. Got {height}, {width}."
)
_common_param_check(batch_size, same_on_batch)
_device, _dtype = _extract_device_dtype([self.ratio, self.scale])
images_area = height * width
target_areas = (_adapted_rsampling(
(batch_size, ), self.scale_sampler, same_on_batch).to(
device=_device, dtype=_dtype) * images_area)
if self.ratio[0] < 1.0 and self.ratio[1] > 1.0:
aspect_ratios1 = _adapted_rsampling(
(batch_size, ), self.ratio_sampler1, same_on_batch)
aspect_ratios2 = _adapted_rsampling(
(batch_size, ), self.ratio_sampler2, same_on_batch)
if same_on_batch:
rand_idxs = (torch.round(
_adapted_rsampling(
(1, ), self.index_sampler,
same_on_batch)).repeat(batch_size).bool())
else:
rand_idxs = torch.round(
_adapted_rsampling((batch_size, ), self.index_sampler,
same_on_batch)).bool()
aspect_ratios = torch.where(rand_idxs, aspect_ratios1,
aspect_ratios2)
else:
aspect_ratios = _adapted_rsampling(
(batch_size, ), self.ratio_sampler, same_on_batch)
aspect_ratios = aspect_ratios.to(device=_device, dtype=_dtype)
# based on target areas and aspect ratios, rectangle params are computed
heights = torch.min(
torch.max(torch.round((target_areas * aspect_ratios)**(1 / 2)),
torch.tensor(1.0, device=_device, dtype=_dtype)),
torch.tensor(height, device=_device, dtype=_dtype),
)
widths = torch.min(
torch.max(torch.round((target_areas / aspect_ratios)**(1 / 2)),
torch.tensor(1.0, device=_device, dtype=_dtype)),
torch.tensor(width, device=_device, dtype=_dtype),
)
xs_ratio = _adapted_rsampling((batch_size, ), self.uniform_sampler,
same_on_batch).to(device=_device,
dtype=_dtype)
ys_ratio = _adapted_rsampling((batch_size, ), self.uniform_sampler,
same_on_batch).to(device=_device,
dtype=_dtype)
xs = xs_ratio * (width - widths + 1)
ys = ys_ratio * (height - heights + 1)
return dict(
widths=widths.floor(),
heights=heights.floor(),
xs=xs.floor(),
ys=ys.floor(),
values=torch.tensor([self.value] * batch_size,
device=_device,
dtype=_dtype),
)
def forward(
self,
batch_shape: torch.Size,
same_on_batch: bool = False
) -> Dict[str, torch.Tensor]: # type:ignore
batch_size, _, depth, height, width = batch_shape
_common_param_check(batch_size, same_on_batch)
_device, _dtype = _extract_device_dtype(
[self.size if isinstance(self.size, torch.Tensor) else None])
if not isinstance(self.size, torch.Tensor):
size = torch.tensor(self.size, device=_device,
dtype=_dtype).repeat(batch_size, 1)
else:
size = self.size.to(device=_device, dtype=_dtype)
if size.shape != torch.Size([batch_size, 3]):
raise AssertionError(
"If `size` is a tensor, it must be shaped as (B, 3). "
f"Got {size.shape} while expecting {torch.Size([batch_size, 3])}."
)
if not (isinstance(depth, (int, )) and isinstance(height, (int, ))
and isinstance(width, (int, )) and depth > 0 and height > 0
and width > 0):
raise AssertionError(
f"`batch_shape` should not contain negative values. Got {(batch_shape)}."
)
x_diff = width - size[:, 2] + 1
y_diff = height - size[:, 1] + 1
z_diff = depth - size[:, 0] + 1
if (x_diff < 0).any() or (y_diff < 0).any() or (z_diff < 0).any():
raise ValueError(
f"input_size {(depth, height, width)} cannot be smaller than crop size {str(size)} in any dimension."
)
if batch_size == 0:
return dict(
src=torch.zeros([0, 8, 3], device=_device, dtype=_dtype),
dst=torch.zeros([0, 8, 3], device=_device, dtype=_dtype),
)
x_start = _adapted_rsampling((batch_size, ), self.rand_sampler,
same_on_batch).to(device=_device,
dtype=_dtype)
y_start = _adapted_rsampling((batch_size, ), self.rand_sampler,
same_on_batch).to(device=_device,
dtype=_dtype)
z_start = _adapted_rsampling((batch_size, ), self.rand_sampler,
same_on_batch).to(device=_device,
dtype=_dtype)
x_start = (x_start * x_diff).floor()
y_start = (y_start * y_diff).floor()
z_start = (z_start * z_diff).floor()
crop_src = bbox_generator3d(x_start.view(-1), y_start.view(-1),
z_start.view(-1), size[:, 2] - 1,
size[:, 1] - 1, size[:, 0] - 1)
if self.resize_to is None:
crop_dst = bbox_generator3d(
torch.tensor([0] * batch_size, device=_device, dtype=_dtype),
torch.tensor([0] * batch_size, device=_device, dtype=_dtype),
torch.tensor([0] * batch_size, device=_device, dtype=_dtype),
size[:, 2] - 1,
size[:, 1] - 1,
size[:, 0] - 1,
)
else:
if not (len(self.resize_to) == 3 and isinstance(
self.resize_to[0],
(int, )) and isinstance(self.resize_to[1], (int, ))
and isinstance(self.resize_to[2],
(int, )) and self.resize_to[0] > 0
and self.resize_to[1] > 0 and self.resize_to[2] > 0):
raise AssertionError(
f"`resize_to` must be a tuple of 3 positive integers. Got {self.resize_to}."
)
crop_dst = torch.tensor(
[[
[0, 0, 0],
[self.resize_to[-1] - 1, 0, 0],
[self.resize_to[-1] - 1, self.resize_to[-2] - 1, 0],
[0, self.resize_to[-2] - 1, 0],
[0, 0, self.resize_to[-3] - 1],
[self.resize_to[-1] - 1, 0, self.resize_to[-3] - 1],
[
self.resize_to[-1] - 1, self.resize_to[-2] - 1,
self.resize_to[-3] - 1
],
[0, self.resize_to[-2] - 1, self.resize_to[-3] - 1],
]],
device=_device,
dtype=_dtype,
).repeat(batch_size, 1, 1)
return dict(src=crop_src.to(device=_device),
dst=crop_dst.to(device=_device))
def forward(
self,
batch_shape: torch.Size,
same_on_batch: bool = False
) -> Dict[str, torch.Tensor]: # type:ignore
batch_size = batch_shape[0]
_common_param_check(batch_size, same_on_batch)
_device, _dtype = _extract_device_dtype(
[self.size if isinstance(self.size, torch.Tensor) else None])
if batch_size == 0:
return dict(
src=torch.zeros([0, 4, 2], device=_device, dtype=_dtype),
dst=torch.zeros([0, 4, 2], device=_device, dtype=_dtype),
)
input_size = (batch_shape[-2], batch_shape[-1])
if not isinstance(self.size, torch.Tensor):
size = torch.tensor(self.size, device=_device,
dtype=_dtype).repeat(batch_size, 1)
else:
size = self.size.to(device=_device, dtype=_dtype)
if size.shape != torch.Size([batch_size, 2]):
raise AssertionError(
"If `size` is a tensor, it must be shaped as (B, 2). "
f"Got {size.shape} while expecting {torch.Size([batch_size, 2])}."
)
if not (input_size[0] > 0 and input_size[1] > 0 and (size > 0).all()):
raise AssertionError(
f"Got non-positive input size or size. {input_size}, {size}.")
size = size.floor()
x_diff = input_size[1] - size[:, 1] + 1
y_diff = input_size[0] - size[:, 0] + 1
# Start point will be 0 if diff < 0
x_diff = x_diff.clamp(0)
y_diff = y_diff.clamp(0)
if same_on_batch:
# If same_on_batch, select the first then repeat.
x_start = (_adapted_rsampling(
(batch_size, ), self.rand_sampler, same_on_batch).to(x_diff) *
x_diff[0]).floor()
y_start = (_adapted_rsampling(
(batch_size, ), self.rand_sampler, same_on_batch).to(y_diff) *
y_diff[0]).floor()
else:
x_start = (_adapted_rsampling(
(batch_size, ), self.rand_sampler, same_on_batch).to(x_diff) *
x_diff).floor()
y_start = (_adapted_rsampling(
(batch_size, ), self.rand_sampler, same_on_batch).to(y_diff) *
y_diff).floor()
crop_src = bbox_generator(
x_start.view(-1).to(device=_device, dtype=_dtype),
y_start.view(-1).to(device=_device, dtype=_dtype),
torch.where(
size[:, 1] == 0,
torch.tensor(input_size[1], device=_device, dtype=_dtype),
size[:, 1]),
torch.where(
size[:, 0] == 0,
torch.tensor(input_size[0], device=_device, dtype=_dtype),
size[:, 0]),
)
if self.resize_to is None:
crop_dst = bbox_generator(
torch.tensor([0] * batch_size, device=_device, dtype=_dtype),
torch.tensor([0] * batch_size, device=_device, dtype=_dtype),
size[:, 1],
size[:, 0],
)
_output_size = size.to(dtype=torch.long)
else:
if not (len(self.resize_to) == 2 and isinstance(
self.resize_to[0],
(int, )) and isinstance(self.resize_to[1], (int, ))
and self.resize_to[0] > 0 and self.resize_to[1] > 0):
raise AssertionError(
f"`resize_to` must be a tuple of 2 positive integers. Got {self.resize_to}."
)
crop_dst = torch.tensor(
[[
[0, 0],
[self.resize_to[1] - 1, 0],
[self.resize_to[1] - 1, self.resize_to[0] - 1],
[0, self.resize_to[0] - 1],
]],
device=_device,
dtype=_dtype,
).repeat(batch_size, 1, 1)
_output_size = torch.tensor(self.resize_to,
device=_device,
dtype=torch.long).expand(
batch_size, -1)
_input_size = torch.tensor(input_size,
device=_device,
dtype=torch.long).expand(batch_size, -1)
return dict(src=crop_src,
dst=crop_dst,
input_size=_input_size,
output_size=_output_size)
def forward(
self,
batch_shape: torch.Size,
same_on_batch: bool = False
) -> Dict[str, torch.Tensor]: # type:ignore
batch_size = batch_shape[0]
size = (batch_shape[-2], batch_shape[-1])
_device, _dtype = _extract_device_dtype([self.scale, self.ratio])
if batch_size == 0:
return dict(
src=torch.zeros([0, 4, 2], device=_device, dtype=_dtype),
dst=torch.zeros([0, 4, 2], device=_device, dtype=_dtype),
size=torch.zeros([0, 2], device=_device, dtype=_dtype),
)
rand = _adapted_rsampling((batch_size, 10), self.rand_sampler,
same_on_batch).to(device=_device,
dtype=_dtype)
area = (rand * (self.scale[1] - self.scale[0]) +
self.scale[0]) * size[0] * size[1]
log_ratio = _adapted_rsampling((batch_size, 10),
self.log_ratio_sampler,
same_on_batch).to(device=_device,
dtype=_dtype)
aspect_ratio = torch.exp(log_ratio)
w = torch.sqrt(area * aspect_ratio).round().floor()
h = torch.sqrt(area / aspect_ratio).round().floor()
# Element-wise w, h condition
cond = ((0 < w) * (w < size[0]) * (0 < h) * (h < size[1])).int()
# torch.argmax is not reproducible across devices: https://github.com/pytorch/pytorch/issues/17738
# Here, we will select the first occurrence of the duplicated elements.
cond_bool, argmax_dim1 = ((cond.cumsum(1) == 1) & cond.bool()).max(1)
h_out = w[
torch.arange(0, batch_size, device=_device, dtype=torch.long),
argmax_dim1]
w_out = h[
torch.arange(0, batch_size, device=_device, dtype=torch.long),
argmax_dim1]
if not cond_bool.all():
# Fallback to center crop
in_ratio = float(size[0]) / float(size[1])
_min = self.ratio.min() if isinstance(
self.ratio, torch.Tensor) else min(self.ratio)
if in_ratio < _min: # type:ignore
h_ct = torch.tensor(size[0], device=_device, dtype=_dtype)
w_ct = torch.round(h_ct / _min)
elif in_ratio > _min: # type:ignore
w_ct = torch.tensor(size[1], device=_device, dtype=_dtype)
h_ct = torch.round(w_ct * _min)
else: # whole image
h_ct = torch.tensor(size[0], device=_device, dtype=_dtype)
w_ct = torch.tensor(size[1], device=_device, dtype=_dtype)
h_ct = h_ct.floor()
w_ct = w_ct.floor()
h_out = h_out.where(cond_bool, h_ct)
w_out = w_out.where(cond_bool, w_ct)
# Update the crop size.
self.size = torch.stack([h_out, w_out], dim=1)
return super().forward(batch_shape, same_on_batch)
def forward(
self,
batch_shape: torch.Size,
same_on_batch: bool = False
) -> Dict[str, torch.Tensor]: # type: ignore
batch_size = batch_shape[0]
height = batch_shape[-2]
width = batch_shape[-1]
_device, _dtype = _extract_device_dtype(
[self.degrees, self.translate, self.scale, self.shear])
_common_param_check(batch_size, same_on_batch)
if not (isinstance(width, (int, )) and isinstance(height, (int, ))
and width > 0 and height > 0):
raise AssertionError(
f"`width` and `height` must be positive integers. Got {width}, {height}."
)
angle = _adapted_rsampling((batch_size, ), self.degree_sampler,
same_on_batch).to(device=_device,
dtype=_dtype)
# compute tensor ranges
if self.scale_2_sampler is not None:
_scale = _adapted_rsampling(
(batch_size, ), self.scale_2_sampler,
same_on_batch).unsqueeze(1).repeat(1, 2)
if self.scale_4_sampler is not None:
_scale[:, 1] = _adapted_rsampling(
(batch_size, ), self.scale_4_sampler, same_on_batch)
_scale = _scale.to(device=_device, dtype=_dtype)
else:
_scale = torch.ones((batch_size, 2), device=_device, dtype=_dtype)
if self.translate_x_sampler is not None and self.translate_y_sampler is not None:
translations = torch.stack(
[
_adapted_rsampling(
(batch_size, ), self.translate_x_sampler,
same_on_batch) * width,
_adapted_rsampling(
(batch_size, ), self.translate_y_sampler,
same_on_batch) * height,
],
dim=-1,
)
translations = translations.to(device=_device, dtype=_dtype)
else:
translations = torch.zeros((batch_size, 2),
device=_device,
dtype=_dtype)
center: torch.Tensor = torch.tensor(
[width, height], device=_device, dtype=_dtype).view(1,
2) / 2.0 - 0.5
center = center.expand(batch_size, -1)
if self.shear_x_sampler is not None and self.shear_y_sampler is not None:
sx = _adapted_rsampling((batch_size, ), self.shear_x_sampler,
same_on_batch)
sy = _adapted_rsampling((batch_size, ), self.shear_y_sampler,
same_on_batch)
sx = sx.to(device=_device, dtype=_dtype)
sy = sy.to(device=_device, dtype=_dtype)
else:
sx = sy = torch.tensor([0] * batch_size,
device=_device,
dtype=_dtype)
return dict(translations=translations,
center=center,
scale=_scale,
angle=angle,
sx=sx,
sy=sy)
