FastVision
"""
blockmodel(inblock::ImageTensor{N}, outblock::OneHotTensor{0}, backbone)
blockmodel(inblock::ImageTensor{N}, outblock::OneHotTensorMulti{0}, backbone)
Construct a model for Ndimensional image classification. `backbone` should
be a convolutional feature extractor taking in batches of image tensors with
`inblock.nch` color channels.
"""
function
blockmodel
(
inblock
::
ImageTensor
{
N
}
,
outblock
::
Union
{
OneHotTensor
{
0
}
,
OneHotTensorMulti
{
0
}
}
,
backbone
)
where
{
N
}
outsz
=
Flux
.
outputsize
(
backbone
,
(
ntuple
(
_
>
256
,
N
)
...
,
inblock
.
nchannels
,
1
)
)
outch
=
outsz
[
end

1
]
head
=
Models
.
visionhead
(
outch
,
length
(
outblock
.
classes
)
,
p
=
0.0
)
return
Flux
.
Chain
(
backbone
,
head
)
end
"""
blockmodel(inblock::ImageTensor{N}, outblock::OneHotTensor{N}, backbone; kwargs...)
Construct a model for Ndimensional image segmentation. `backbone` should
be a convolutional feature extractor taking in batches of image tensors with
`inblock.nch` color channels. Keyword arguments are passed to [`UNetDynamic`](#).
"""
function
blockmodel
(
inblock
::
ImageTensor
{
N
}
,
outblock
::
OneHotTensor
{
N
}
,
backbone
;
kwargs
...
)
where
{
N
}
return
Models
.
UNetDynamic
(
backbone
,
(
ntuple
(
_
>
256
,
N
)
...
,
inblock
.
nchannels
,
1
)
,
length
(
outblock
.
classes
)
;
kwargs
...
)
end
"""
blockmodel(inblock::ImageTensor{N}, outblock::Keypoints{N}, backbone)
Construct a model for image to keypoint regression. `backbone` should
be a convolutional feature extractor taking in batches of image tensors with
`inblock.nch` color channels.
"""
function
blockmodel
(
inblock
::
ImageTensor
{
N
}
,
outblock
::
KeypointTensor
{
N
}
,
backbone
)
where
{
N
}
outsz
=
Flux
.
outputsize
(
backbone
,
(
ntuple
(
_
>
256
,
N
)
...
,
inblock
.
nchannels
,
1
)
)
outch
=
outsz
[
end

1
]
head
=
Models
.
visionhead
(
outch
,
prod
(
outblock
.
sz
)
*
N
,
p
=
0.0
)
return
Flux
.
Chain
(
backbone
,
head
)
end
"""
blockbackbone(ImageTensor{2}(ch))
Construct a XResNet18 model that takes in an encoded image with `ch`
color channels.
"""
blockbackbone
(
inblock
::
ImageTensor
{
2
}
)
=
Models
.
xresnet18
(
c_in
=
inblock
.
nchannels
)
@
testset
"
blockbackbone
"
begin
@
test_nowarn
FastAI
.
blockbackbone
(
ImageTensor
{
2
}
(
3
)
)
end