Whole-window model op (advanced): apply fn to the raw padded chunk.
lazy_patch.RdThe escape hatch behind model-inference verbs such as ocm_mask():
where focal() materialises a shift list (unusable beyond small
radii), a patch op hands fn the raw window carrying radius halo
cells per side and crops the contaminated ring off the result. fn
must be size-preserving on the last two (spatial) dims, derive every
size from its input's shape, be written in the g_* vocabulary, and
reduce the leading band axis to out_bands channels (0 = a plain
2D result). Not differentiable. ocm_model()-based cloud-mask
prediction is the in-package example of its use.
Usage
lazy_patch(
x,
fn,
radius,
out_bands = 0L,
dtype = "f32",
kernel_id,
bytes_px = 512,
flops_px = 10000
)Arguments
- x
A
LazyRaster(typically a(band, y, x)stack).- fn
Model body
fn(xpad), size-preserving.- radius
Halo consumed per side, pixels.
- out_bands
Output band count; 0 drops the band axis.
- dtype
Output dtype (default
"f32").- kernel_id
Content identity of the closed-over model.
- bytes_px
Working-set estimate, bytes per core pixel.
- flops_px
Compute estimate, flops per core pixel.