[Web] [Webnn] Can't seem to use the WebNN. Getting "WEBNN execution provider is not supported in this build."

[RafayAK]

Describe the issue

Hi, when providing webnn as one of the executors I get this error:

error: Can't append execution provider: WEBNN. ERROR_CODE: 2, ERROR_MESSAGE: WEBNN execution provider is not supported in this build. 
    at t.checkLastError (ort.min.js:9:306896)
    at eval (ort.min.js:9:296280)
    at t.setSessionOptions (ort.min.js:9:296325)
    at t.createSessionFinalize (ort.min.js:9:299274)
    at t.createSessionFinalize (ort.min.js:9:290097)
    at t.OnnxruntimeWebAssemblySessionHandler.loadModel (ort.min.js:9:292999)
    at async Object.createSessionHandler (ort.min.js:9:1034)
    at async i.create (ort.min.js:9:538248)

There is very little documentation around webnn use in the Onnxweb-runtime documentation (https://onnxruntime.ai/docs/tutorials/web/env-flags-and-session-options.html#executionproviders).
I really appreciate the help 👍

To reproduce

import { InferenceSession, Tensor, env } from "onnxruntime-web";
const options = {
    executionProviders: ["webnn"], // Use WebNN for inference
};

const session = await InferenceSession.create(MODEL_URL, options);

Urgency

No response

ONNX Runtime Installation

Released Package

ONNX Runtime Version or Commit ID

1.16.1

Execution Provider

Other / Unknown

[RafayAK]

I updated the onnx-web runtime package to the latest [email protected] still can't get it to work (code is same as above)

 Failed to load model: Error: no available backend found. ERR: [webnn] backend not found.
    at Dn (ort.min.js:20:1787)
    at async a.create (ort.min.js:20:18248)

[guschmue]

ort.min does not include webgpu or webnn EP.
Use
import { InferenceSession, Tensor, env } from 'onnxruntime-web/webgpu';