| --- |
| library_name: kernels |
| license: apache-2.0 |
| tags: |
| - kernel |
| - webgpu |
| - wgsl |
| --- |
| # ai.onnx.SplitToSequence |
|
|
| `ai.onnx` · internal tensor lowering (non-standard) · reviewed against ONNX opset 11 |
|
|
| ## Description |
|
|
| Support status: the standard ONNX `SplitToSequence` operator is not implemented because this kernel ABI exposes tensors rather than an ONNX sequence value. This internal lowering copies an input into two, three, four, or six caller-shaped tensor outputs and therefore does not implement the standard `output_sequence` contract; it must not be treated as ONNX `SplitToSequence`. |
|
|
| See the [standard ONNX `SplitToSequence` spec](https://onnx.ai/onnx/operators/onnx__SplitToSequence.html) for the contract this internal lowering does not implement. |
|
|
| ## Inputs |
|
|
| | Name | Bind key | Logical dtype | Rank | Shape | Description | Presence | |
| | --- | --- | --- | --- | --- | --- | --- | |
| | `input` | `input` | `T` | — | — | The tensor to split. | required | |
| | `split` | `split` | `S` | — | — | Length of each output slice: a scalar for uniform chunks or a 1-D tensor of per-output lengths. | optional | |
|
|
| ## Outputs |
|
|
| | Name | Bind key | Logical dtype | Rank | Shape | Description | Presence | |
| | --- | --- | --- | --- | --- | --- | --- | |
| | `Y0` | `y0` | `T` | derived | — | First output tensor slice. | required | |
| | `Y1` | `y1` | `T` | derived | — | Second output tensor slice. | required | |
| | `Y2` | `y2` | `T` | derived | — | Third output tensor slice. | optional | |
| | `Y3` | `y3` | `T` | derived | — | Fourth output tensor slice. | optional | |
| | `Y4` | `y4` | `T` | derived | — | Fifth output tensor slice. | optional | |
| | `Y5` | `y5` | `T` | derived | — | Sixth output tensor slice. | optional | |
|
|
| ## Attributes |
|
|
| Default values (overridable per request): |
|
|
| | Attribute | Default | Description | |
| | --- | --- | --- | |
| | `axis` | `0` | Axis along which to split; negative values count from the back. Accepted range is `[-rank, rank-1]`. | |
| | `keepdims` | `1` | Whether to keep the split dimension in the output (default `1`). Ignored when `split` is provided. | |
|
|
| ## Type constraints |
|
|
| | Variable | Allowed dtypes | |
| | --- | --- | |
| | `T` | `float32`, `float16`, `bool` | |
| | `S` | `uint32` | |
|
|
| ## 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 |
| - [`split-to-sequence.wgsl.jinja`](build/webgpu/split-to-sequence.wgsl.jinja) |
|
|
| ## Use with `@huggingface/kernels` |
|
|
| The loader automatically allocates outputs whose metadata it can derive from the manifest contract and this call. |
|
|
| The explicit `outputs` entries provide shape and logical dtype metadata for the results listed below: |
|
|
| - `y0` |
| - `y1` |
|
|
| Each entry either requests an optional result or supplies metadata that cannot be inferred from the inputs. |
|
|
| 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/ai.onnx.SplitToSequence", { version: 1 }); |
| // Explicit destinations request optional results or supply metadata that cannot be inferred. |
| const { y0, y1 } = await kernel({ input: { data: inputData, shape: [3, 2] } }, { |
| outputs: { |
| y0: { shape: [1, 2], dtype: "float32" }, |
| y1: { shape: [1, 2], dtype: "float32" }, |
| }, |
| }); |
| ``` |
|
|
