| --- |
| library_name: kernels |
| license: apache-2.0 |
| tags: |
| - kernel |
| - webgpu |
| - wgsl |
| --- |
| # com.microsoft.BiasAdd |
|
|
| `com.microsoft` · ONNX Runtime contrib operator · contrib since_version 1 |
| |
| ## Description |
| |
| Adds a 1-D `bias` (broadcast over the channel dimension) to input `X`, then adds the residual tensor `skip` elementwise. All three tensors share the same channel count `C`; `X` and `skip` have shape `(N, S, C)`. |
| |
| See the [ONNX Runtime `BiasAdd` contrib-operator spec](https://github.com/microsoft/onnxruntime/blob/main/docs/ContribOperators.md#com.microsoft.BiasAdd) for the reference semantics. |
| |
| ## Inputs |
| |
| | Name | Bind key | Logical dtype | Rank | Shape | Description | Presence | |
| | --- | --- | --- | --- | --- | --- | --- | |
| | `X` | `X` | `T` | `3` | — | Input tensor of shape `(N, S, C)`: batch size `N`, spatial size `S`, and `C` channels. | required | |
| | `bias` | `bias` | `T` | `1` | — | 1-D bias vector of length C, broadcast-added along the channel dimension. | required | |
| | `skip` | `skip` | `T` | `3` | — | Residual tensor with the same `(N, S, C)` shape as `X`, added after the bias. | required | |
| |
| ## Outputs |
| |
| | Name | Bind key | Logical dtype | Rank | Shape | Description | Presence | |
| | --- | --- | --- | --- | --- | --- | --- | |
| | `Y` | `Y` | `T` | `3` | same as `X` | Output tensor of shape `(N, S, C)`: the elementwise sum `X + bias + skip`. | required | |
| |
| ## Type constraints |
| |
| | Variable | Allowed dtypes | |
| | --- | --- | |
| | `T` | `float32`, `float16` | |
| |
| ## Files |
| |
| - [`metadata.json`](build/webgpu/metadata.json) — kernel metadata (id, digests, provenance) |
| - [`manifest.json`](build/webgpu/manifest.json) — the op contract (source of truth) |
| - [`test.json`](build/webgpu/test.json) — correctness cases |
| - [`bench.json`](build/webgpu/bench.json) — benchmark + tuning cases |
| - [`bias-add.wgsl.jinja`](build/webgpu/bias-add.wgsl.jinja) |
| |
| ## Use with `@huggingface/kernels` |
| |
| The loader derives every required output's shape and logical dtype from the manifest contract and this call. |
| It then allocates the result tensors automatically. |
| |
| The `version: 1` option selects the published kernel contract; it is independent of any operator opset, contrib `since_version`, or model version. |
|
|
| Replace each `*Data` placeholder with a typed array containing the corresponding input data. |
|
|
| ```js |
| import { getKernel } from "@huggingface/kernels"; |
| |
| const kernel = await getKernel("webgpu-kernels/com.microsoft.BiasAdd", { version: 1 }); |
| const { Y } = await kernel({ |
| X: { data: XData, shape: [1, 2, 4] }, |
| bias: { data: biasData, shape: [4] }, |
| skip: { data: skipData, shape: [1, 2, 4] }, |
| }); |
| ``` |
|
|
