ai.onnx.Constant

ai.onnx · standard ONNX operator · ONNX opset ≥ 24

Description

Produces a numeric constant from ONNX's tensor-valued value attribute or its float scalar/list shorthands. Sparse, string, and int64-only shorthand attributes are not yet supported.

See the ONNX Constant spec for the reference semantics.

Outputs

Attributes

Attributes and default values (overridable per request):

Type constraints

Files

• metadata.json — kernel metadata (id, digests, provenance)
• manifest.json — the op contract (source of truth)
• test.json — correctness cases
• bench.json — benchmark + tuning cases
• constant.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:

• output

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.

import { getKernel } from "@huggingface/kernels";

const kernel = await getKernel("webgpu-kernels/ai.onnx.Constant", { version: 1 });
// Explicit destinations request optional results or supply metadata that cannot be inferred.
const { output } = await kernel({}, {
  attrs: { value_float: -2.5 },
  outputs: { output: { shape: [], dtype: "float32" } },
});