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README.md
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base_model:
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- schirrmacher/ormbg
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# ormbg_isnet — ExecuTorch
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- **Source**: schirrmacher/ormbg
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- **License**: Apache-2.0
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All variants take and return fp32 tensors — swap the `.pte` file, keep your app code.
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|-----------|------|-----------|------------------------------------|------------------|
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| fp32 | `ormbg_isnet_xnnpack_fp32.pte` | 176.1 | 1.000000 | 121.7 |
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| int8 | `ormbg_isnet_xnnpack_int8.pte` | 44.3 | 0.999988 | 87.2 |
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\*Mac arm64, single process, median of 10 — a reference point for relative cost
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only, not a device number (torch eager fp32 on the same machine: 375.5 ms).
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Correlation is a first filter. These are the numbers that decide:
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- **int8** — measured in the units that matter for this model
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###
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- **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.
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## Conversion
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torch.export -> to_edge_transform_and_lower(
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(conversion scripts: [executorch-models](https://github.com/john-rocky/executorch-models))
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base_model:
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- schirrmacher/ormbg
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---
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# ormbg_isnet — ExecuTorch
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- **Source**: schirrmacher/ormbg
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- **License**: Apache-2.0
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All variants take and return fp32 tensors — swap the `.pte` file, keep your app code.
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| build | file | size (MB) | parity vs fp32 eager (worst corr) | Mac median (ms)* |
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|-----------|------|-----------|------------------------------------|------------------|
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| fp32 | `ormbg_isnet_xnnpack_fp32.pte` | 176.1 | 1.000000 | 121.7 |
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| int8 | `ormbg_isnet_xnnpack_int8.pte` | 44.3 | 0.999988 | 87.2 |
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| Core ML (fp16, iOS) | `ormbg_isnet_coreml_all.pte` | 89.0 | 0.999999 | 28.5 |
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The Core ML build is the same graph lowered to Apple's Neural Engine instead of
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XNNPACK, which is CPU-only. On an iPhone 17 Pro, Depth-Anything-V2-Small runs
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500.8 ms through XNNPACK and 42.7 ms through Core ML, at half the file size. It
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computes in fp16 and is iOS-only; the XNNPACK files stay the portable option and
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are what runs on Android.
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\*Mac arm64, single process, median of 10 — a reference point for relative cost
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only, not a device number (torch eager fp32 on the same machine: 375.5 ms).
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Correlation is a first filter. These are the numbers that decide:
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- **int8** — measured in the units that matter for this model — mask IoU at 0.5: median 0.9987 over 10 real images, worst 0.9868.
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### Builds that did not earn a slot
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- **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.
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## Conversion
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torch.export -> to_edge_transform_and_lower(partitioner) -> .pte
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(conversion scripts: [executorch-models](https://github.com/john-rocky/executorch-models))
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