Arm backend: Create documents for the supported operators

[gggekov]

for the three Arm backends.

cc @digantdesai @SS-JIA @freddan80 @per @zingo @oscarandersson8218 @mansnils @Sebastian-Larsson @robell

[pytorch-bot]

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NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 3ee93f0d35136621639ad3b4073176535302276b975cd37bc190b23960a6f564 /exec failed with exit code 1
• pull / test-samsung-quantmodels-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 2431ab53fab3fe5c879b253be54aefb1c054ea2b0c199cb46b87b78d3923b5f3 /exec failed with exit code 1
• pull / unittest / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_conv2d.py::TestConv2d::test_fp16_conv2d

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[Copilot]

Pull request overview

Adds operator-support documentation pages for Arm backends (VGF and Ethos-U) and links them from the backend overview/reference sections.

Changes:

• Link new operator-support pages from the Arm VGF overview page.
• Link new operator-support pages (U55/U85) from the Arm Ethos-U overview page.
• Introduce three new Markdown pages listing supported EdgeIR operators for VGF, U55, and U85.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
docs/source/backends/arm-vgf/arm-vgf-overview.md	Adds a reference link to the new VGF operator support page.
docs/source/backends/arm-vgf/VGF_op_support.md	New operator support matrix page for VGF.
docs/source/backends/arm-ethos-u/arm-ethos-u-overview.md	Adds reference links to new U55/U85 operator support pages.
docs/source/backends/arm-ethos-u/U55_op_support.md	New operator support matrix page for Ethos-U55.
docs/source/backends/arm-ethos-u/U85_op_support.md	New operator support matrix page for Ethos-U85.

Comments suppressed due to low confidence (11)

docs/source/backends/arm-vgf/VGF_op_support.md:3

• This page uses a level-2 heading (##) as the first header. Other backend docs use a level-1 page title (# ...), which is important for consistent sidebar/page titles in Sphinx/MyST; consider changing this to a top-level # heading.

## EdgeIR Operator support for the VGF backend
This list contains operators with silicon acceleration support. The ExecuTorch portable kernels allow running more operations with a fallback.
8x8 designates 8-bit activation and 8-bit weight. 16x8 means 16-bit activation and 8-bit weight. Per-tensor and per-channel quantization are supported.

docs/source/backends/arm-vgf/VGF_op_support.md:8

• The table header says "Compute DType" but the values in that column are "Static integer quantization" (a quantization scheme, not a dtype). Please rename the column (e.g., "Compute type" / "Quantization scheme") or update the values to actual dtypes (e.g., int8) so the table is internally consistent.

| EdgeIR operator | Compute DType                 | Quantization |
| --------------- | ------------------------------| ------------ |
| _log_softmax.default | Static integer quantization | 8x8 |
| _native_batch_norm_legit_no_training.default | Static integer quantization | 8x8 |

docs/source/backends/arm-vgf/VGF_op_support.md:10

• Operator names like _log_softmax.default start with underscores; in Markdown these often get parsed as emphasis, which can render the names incorrectly. Consider wrapping all operator names in inline code (backticks) (or escaping underscores) so they render verbatim.

| _log_softmax.default | Static integer quantization | 8x8 |
| _native_batch_norm_legit_no_training.default | Static integer quantization | 8x8 |
| _softmax.default | Static integer quantization | 8x8 |
| _to_copy.default | Static integer quantization | 8x8 |

docs/source/backends/arm-ethos-u/U55_op_support.md:10

• Operator names beginning with _... are likely to be mis-rendered by Markdown as italics/emphasis. Wrapping the operator names in inline code (backticks) (or escaping underscores) will ensure the names display exactly as written.

| _log_softmax.default | Static integer quantization | 8x8 |
| _softmax.default | Static integer quantization | 8x8 |
| _to_copy.default | Static integer quantization | 8x8 |
| abs.default | Static integer quantization | 8x8 |

docs/source/backends/arm-ethos-u/arm-ethos-u-overview.md:241

• U55_op_support and U85_op_support are linked in the Reference section, but neither page is included in the hidden {toctree}. This can trigger Sphinx "document isn't included in any toctree" warnings and makes the pages harder to discover via sidebar navigation; add them to the toctree (or mark the pages as orphan if intentionally excluded).

**→{doc}`/backends/arm-ethos-u/U55_op_support` — Ethos-U55 supported operators.**

**→{doc}`/backends/arm-ethos-u/U85_op_support` — Ethos-U85 supported operators.**

```{toctree}
:maxdepth: 2
:hidden:
:caption: Arm Ethos-U Backend

arm-ethos-u-partitioner
arm-ethos-u-quantization
arm-ethos-u-troubleshooting
tutorials/arm-ethos-u-tutorials

**docs/source/backends/arm-ethos-u/U55_op_support.md:3**
* This page uses a level-2 heading (`##`) as the first header. For consistency with other backend docs (which typically use `#` for the page title), consider making this a top-level heading so Sphinx/MyST generates the expected page title.

EdgeIR Operator support for the U55 backend

This list contains operators with silicon acceleration support. The ExecuTorch portable kernels allow running more operations with a fallback.
8x8 designates 8-bit activation and 8-bit weight. 16x8 means 16-bit activation and 8-bit weight. Per-tensor and per-channel quantization are supported.

**docs/source/backends/arm-ethos-u/U55_op_support.md:12**
* The table header says "Compute DType" but the entries in that column are "Static integer quantization" (not a dtype). Rename the column or adjust the column values so the semantics match and readers can interpret the support matrix correctly.

EdgeIR operator	Compute DType	Quantization
_log_softmax.default	Static integer quantization	8x8
_softmax.default	Static integer quantization	8x8
_to_copy.default	Static integer quantization	8x8
abs.default	Static integer quantization	8x8
acos.default	Static integer quantization	8x8
adaptive_avg_pool2d.default	Static integer quantization	16x8 / 8x8

**docs/source/backends/arm-ethos-u/U85_op_support.md:3**
* This page starts with a level-2 heading (`##`). For consistency with the rest of the backend docs and to ensure Sphinx/MyST uses it as the page title, consider switching this to a level-1 `#` heading.

EdgeIR Operator support for the U85 backend

This list contains operators with silicon acceleration support. The ExecuTorch portable kernels allow running more operations with a fallback.
8x8 designates 8-bit activation and 8-bit weight. 16x8 means 16-bit activation and 8-bit weight. Per-tensor and per-channel quantization are supported.

**docs/source/backends/arm-ethos-u/U85_op_support.md:11**
* The column labeled "Compute DType" contains "Static integer quantization" values, which is not a dtype. Please rename this column or change the values to actual compute dtypes so the table isn't misleading.

EdgeIR operator	Compute DType	Quantization
_log_softmax.default	Static integer quantization	8x8
_softmax.default	Static integer quantization	8x8
abs.default	Static integer quantization	8x8
acos.default	Static integer quantization	8x8
adaptive_avg_pool2d.default	Static integer quantization	16x8 / 8x8

**docs/source/backends/arm-ethos-u/U85_op_support.md:9**
* Operator names with leading underscores (e.g., `_log_softmax.default`) can be parsed by Markdown as emphasis and render incorrectly. Wrap the operator names in inline code (backticks) (or escape underscores) to preserve the literal operator spelling.

| _log_softmax.default | Static integer quantization | 8x8 |
| _softmax.default | Static integer quantization | 8x8 |
| abs.default | Static integer quantization | 8x8 |

**docs/source/backends/arm-vgf/arm-vgf-overview.md:153**
* The new operator-support page is linked in the Reference list but not included in the page's hidden toctree. Sphinx commonly emits a "document isn't included in any toctree" warning for such pages; add `VGF_op_support` to the `{toctree}` (or explicitly mark the page as orphan) to avoid doc build warnings and ensure the page is discoverable in navigation.

→{doc}/backends/arm-vgf/VGF_op_support — VGF supported operators.

:maxdepth: 2
:hidden:
:caption: Arm VGF Backend

arm-vgf-partitioner
arm-vgf-quantization
arm-vgf-troubleshooting
tutorials/arm-vgf-tutorials

</details>



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