All variants take and return fp32 tensors — swap the
.pte
file, keep your app code.
precision
file
size (MB)
parity vs fp32 eager (worst corr)
Mac median (ms)*
fp32
ormbg_isnet_xnnpack_fp32.pte
176.1
1.000000
121.7
int8
ormbg_isnet_xnnpack_int8.pte
44.3
0.999988
87.2
*Mac arm64, single process, median of 10 — a reference point for relative cost
only, not a device number (torch eager fp32 on the same machine: 375.5 ms).
Checked in the task's own units
Correlation is a first filter. These are the numbers that decide:
int8
— measured in the units that matter for this model: mask IoU at 0.5, median 0.9994 over five real images (worst 0.9916) against the fp32 build.
Precisions that did not earn a slot
fp16 is not shipped
: it comes out at 100% of the fp32 file (176.1 MB vs 176.1 MB), so it buys nothing. XNNPACK serializes convolution weights as fp32 no matter what dtype the graph carries, so on a conv-heavy model fp16 saves no disk and only adds cast operations. Reach for int8 here, not fp16.
Verification (executorch 1.4.0, torch 2.13.0)
Parity is measured against the fp32 eager model on real image input;
corr
is
the correlation over all elements of each output tensor.
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