def __init__(
self,
spatial_dims: int = 3,
init_filters: int = 8,
in_channels: int = 1,
out_channels: int = 2,
dropout_prob: Optional[float] = None,
norm_name: str = "group",
num_groups: int = 8,
use_conv_final: bool = True,
blocks_down: tuple = (1, 2, 2, 4),
blocks_up: tuple = (1, 1, 1),
upsample_mode: Union[UpsampleMode, str] = UpsampleMode.NONTRAINABLE,
):
super().__init__()
assert spatial_dims == 2 or spatial_dims == 3, "spatial_dims can only be 2 or 3."
self.spatial_dims = spatial_dims
self.init_filters = init_filters
self.blocks_down = blocks_down
self.blocks_up = blocks_up
self.dropout_prob = dropout_prob
self.norm_name = norm_name
self.num_groups = num_groups
self.upsample_mode = UpsampleMode(upsample_mode)
self.use_conv_final = use_conv_final
self.convInit = get_conv_layer(spatial_dims, in_channels, init_filters)
self.down_layers = self._make_down_layers()
self.up_layers, self.up_samples = self._make_up_layers()
self.relu = Act[Act.RELU](inplace=True)
self.conv_final = self._make_final_conv(out_channels)
if dropout_prob is not None:
self.dropout = Dropout[Dropout.DROPOUT, spatial_dims](dropout_prob)
def __init__(
self,
spatial_dims: int,
in_channels: int,
out_channels: Optional[int] = None,
scale_factor: Union[Sequence[float], float] = 2,
with_conv: bool = False,
mode: Union[UpsampleMode, str] = UpsampleMode.LINEAR,
align_corners: Optional[bool] = True,
) -> None:
"""
Args:
spatial_dims: number of spatial dimensions of the input image.
in_channels: number of channels of the input image.
out_channels: number of channels of the output image. Defaults to `in_channels`.
scale_factor: multiplier for spatial size. Has to match input size if it is a tuple. Defaults to 2.
with_conv: whether to use a transposed convolution for upsampling. Defaults to False.
mode: {``"nearest"``, ``"linear"``, ``"bilinear"``, ``"bicubic"``, ``"trilinear"``}
If ends with ``"linear"`` will use ``spatial dims`` to determine the correct interpolation.
This corresponds to linear, bilinear, trilinear for 1D, 2D, and 3D respectively.
The interpolation mode. Defaults to ``"linear"``.
See also: https://pytorch.org/docs/stable/nn.html#upsample
align_corners: set the align_corners parameter of `torch.nn.Upsample`. Defaults to True.
"""
super().__init__()
scale_factor_ = ensure_tuple_rep(scale_factor, spatial_dims)
if not out_channels:
out_channels = in_channels
if not with_conv:
mode = UpsampleMode(mode)
linear_mode = [
UpsampleMode.LINEAR, UpsampleMode.BILINEAR,
UpsampleMode.TRILINEAR
]
if mode in linear_mode: # choose mode based on spatial_dims
mode = linear_mode[spatial_dims - 1]
self.upsample = nn.Sequential(
Conv[Conv.CONV, spatial_dims](in_channels=in_channels,
out_channels=out_channels,
kernel_size=1),
nn.Upsample(scale_factor=scale_factor_,
mode=mode.value,
align_corners=align_corners),
)
else:
self.upsample = Conv[Conv.CONVTRANS,
spatial_dims](in_channels=in_channels,
out_channels=out_channels,
kernel_size=scale_factor_,
stride=scale_factor_)
def __init__(
self,
spatial_dims: int = 3,
init_filters: int = 8,
in_channels: int = 1,
out_channels: int = 2,
dropout_prob: Optional[float] = None,
act: Union[Tuple, str] = ("RELU", {
"inplace": True
}),
norm: Union[Tuple, str] = ("GROUP", {
"num_groups": 8
}),
norm_name: str = "",
num_groups: int = 8,
use_conv_final: bool = True,
blocks_down: tuple = (1, 2, 2, 4),
blocks_up: tuple = (1, 1, 1),
upsample_mode: Union[UpsampleMode, str] = UpsampleMode.NONTRAINABLE,
):
super().__init__()
if spatial_dims not in (2, 3):
raise ValueError("`spatial_dims` can only be 2 or 3.")
self.spatial_dims = spatial_dims
self.init_filters = init_filters
self.in_channels = in_channels
self.blocks_down = blocks_down
self.blocks_up = blocks_up
self.dropout_prob = dropout_prob
self.act = act # input options
self.act_mod = get_act_layer(act)
if norm_name:
if norm_name.lower() != "group":
raise ValueError(
f"Deprecating option 'norm_name={norm_name}', please use 'norm' instead."
)
norm = ("group", {"num_groups": num_groups})
self.norm = norm
self.upsample_mode = UpsampleMode(upsample_mode)
self.use_conv_final = use_conv_final
self.convInit = get_conv_layer(spatial_dims, in_channels, init_filters)
self.down_layers = self._make_down_layers()
self.up_layers, self.up_samples = self._make_up_layers()
self.conv_final = self._make_final_conv(out_channels)
if dropout_prob is not None:
self.dropout = Dropout[Dropout.DROPOUT, spatial_dims](dropout_prob)
def __init__(
self,
spatial_dims: int = 3,
init_filters: int = 8,
in_channels: int = 1,
out_channels: int = 2,
dropout_prob: Optional[float] = None,
act: Union[Tuple, str] = ("RELU", {
"inplace": True
}),
norm: Union[Tuple, str] = ("GROUP", {
"num_groups": 8
}),
use_conv_final: bool = True,
blocks_down: tuple = (1, 2, 2, 4),
blocks_up: tuple = (1, 1, 1),
upsample_mode: Union[UpsampleMode, str] = UpsampleMode.NONTRAINABLE,
):
super().__init__()
if spatial_dims not in (2, 3):
raise AssertionError("spatial_dims can only be 2 or 3.")
self.spatial_dims = spatial_dims
self.init_filters = init_filters
self.in_channels = in_channels
self.blocks_down = blocks_down
self.blocks_up = blocks_up
self.dropout_prob = dropout_prob
self.act = get_act_layer(act)
self.norm = norm
self.upsample_mode = UpsampleMode(upsample_mode)
self.use_conv_final = use_conv_final
self.convInit = get_conv_layer(spatial_dims, in_channels, init_filters)
self.down_layers = self._make_down_layers()
self.up_layers, self.up_samples = self._make_up_layers()
self.conv_final = self._make_final_conv(out_channels)
if dropout_prob is not None:
self.dropout = Dropout[Dropout.DROPOUT, spatial_dims](dropout_prob)
def __init__(
self,
dimensions: int,
in_channels: Optional[int] = None,
out_channels: Optional[int] = None,
scale_factor: Union[Sequence[float], float] = 2,
mode: Union[UpsampleMode, str] = UpsampleMode.DECONV,
pre_conv: Optional[Union[nn.Module, str]] = "default",
interp_mode: Union[InterpolateMode, str] = InterpolateMode.LINEAR,
align_corners: Optional[bool] = True,
bias: bool = True,
apply_pad_pool: bool = True,
) -> None:
"""
Args:
dimensions: number of spatial dimensions of the input image.
in_channels: number of channels of the input image.
out_channels: number of channels of the output image. Defaults to `in_channels`.
scale_factor: multiplier for spatial size. Has to match input size if it is a tuple. Defaults to 2.
mode: {``"deconv"``, ``"nontrainable"``, ``"pixelshuffle"``}. Defaults to ``"deconv"``.
pre_conv: a conv block applied before upsampling. Defaults to None.
When ``conv_block`` is ``"default"``, one reserved conv layer will be utilized when
Only used in the "nontrainable" or "pixelshuffle" mode.
interp_mode: {``"nearest"``, ``"linear"``, ``"bilinear"``, ``"bicubic"``, ``"trilinear"``}
Only used when ``mode`` is ``UpsampleMode.NONTRAINABLE``.
If ends with ``"linear"`` will use ``spatial dims`` to determine the correct interpolation.
This corresponds to linear, bilinear, trilinear for 1D, 2D, and 3D respectively.
The interpolation mode. Defaults to ``"linear"``.
See also: https://pytorch.org/docs/stable/nn.html#upsample
align_corners: set the align_corners parameter of `torch.nn.Upsample`. Defaults to True.
Only used in the nontrainable mode.
bias: whether to have a bias term in the default preconv and deconv layers. Defaults to True.
apply_pad_pool: if True the upsampled tensor is padded then average pooling is applied with a kernel the
size of `scale_factor` with a stride of 1. See also: :py:class:`monai.networks.blocks.SubpixelUpsample`.
Only used in the pixelshuffle mode.
"""
super().__init__()
scale_factor_ = ensure_tuple_rep(scale_factor, dimensions)
up_mode = UpsampleMode(mode)
if up_mode == UpsampleMode.DECONV:
if not in_channels:
raise ValueError(
f"in_channels needs to be specified in the '{mode}' mode.")
self.add_module(
"deconv",
Conv[Conv.CONVTRANS, dimensions](
in_channels=in_channels,
out_channels=out_channels or in_channels,
kernel_size=scale_factor_,
stride=scale_factor_,
bias=bias,
),
)
elif up_mode == UpsampleMode.NONTRAINABLE:
if pre_conv == "default" and (
out_channels !=
in_channels): # defaults to no conv if out_chns==in_chns
if not in_channels:
raise ValueError(
f"in_channels needs to be specified in the '{mode}' mode."
)
self.add_module(
"preconv",
Conv[Conv.CONV, dimensions](in_channels=in_channels,
out_channels=out_channels
or in_channels,
kernel_size=1,
bias=bias),
)
elif pre_conv is not None and pre_conv != "default":
self.add_module("preconv", pre_conv) # type: ignore
interp_mode = InterpolateMode(interp_mode)
linear_mode = [
InterpolateMode.LINEAR, InterpolateMode.BILINEAR,
InterpolateMode.TRILINEAR
]
if interp_mode in linear_mode: # choose mode based on dimensions
interp_mode = linear_mode[dimensions - 1]
self.add_module(
"upsample_non_trainable",
nn.Upsample(scale_factor=scale_factor_,
mode=interp_mode.value,
align_corners=align_corners),
)
elif up_mode == UpsampleMode.PIXELSHUFFLE:
self.add_module(
"pixelshuffle",
SubpixelUpsample(
dimensions=dimensions,
in_channels=in_channels,
out_channels=out_channels,
scale_factor=scale_factor_[0], # isotropic
conv_block=pre_conv,
apply_pad_pool=apply_pad_pool,
bias=bias,
),
)
else:
raise NotImplementedError(f"Unsupported upsampling mode {mode}.")