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 unsupported.

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, per-variant templates, 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

npm install --save-exact @huggingface/kernels@0.0.1-preview.2

Outputs with inferable metadata are allocated automatically. Explicit outputs entries request optional results or provide metadata that cannot be inferred from the supplied inputs and attributes.

This example supplies explicit metadata for:

• output

The version: 1 option selects the published kernel contract; it is independent of any operator opset, contrib since_version, or model version. It follows the v1 branch as fixes land. To pin exact artifact bytes, pass a 40-character commit revision instead of 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" } },
});