Error: FaceRecognizer.constructor - expected inputs to be of type LabeledFaceDescriptors | WithFaceDescriptor<any> | Float32Array | Array<LabeledFaceDescriptors | WithFaceDescriptor<any> | Float32Array>

The documentation for FaceMatcher throws an exception in NodeJS. Although faceapi.detectAllFaces finds faces, new faceapi.FaceMatcher(faceResults) throws an exception. Can you please let us know what we should be doing here?

Code:

  await faceapi.nets.ssdMobilenetv1.loadFromDisk(modelUrl)
  await faceapi.nets.faceLandmark68Net.loadFromDisk(modelUrl)
  await faceapi.nets.faceRecognitionNet.loadFromDisk(modelUrl)

  const faceBase64 = 'data:image/jpg;base64,' + fs.readFileSync(`./tests/data/face1.jpg`, {encoding: 'base64'})
  const faceImage = new Image()
  faceImage.src = faceBase64
  const faceResults = await faceapi.detectAllFaces(faceImage)
      .withFaceLandmarks()
      .withFaceDescriptors()

  if (!faceResults.length) { // length is 1
    return
  }
  const faceMatcher = new faceapi.FaceMatcher(faceResults) // --> Exception

Error: FaceRecognizer.constructor - expected inputs to be of type LabeledFaceDescriptors | WithFaceDescriptor<any> | Float32Array | Array<LabeledFaceDescriptors | WithFaceDescriptor<any> | Float32Array>

    at /Users/.../node_modules/face-api.js/src/globalApi/FaceMatcher.ts:40:13
    at Array.map (<anonymous>)
    at new FaceMatcher (/Users/.../node_modules/face-api.js/src/globalApi/FaceMatcher.ts:27:43)
    at ...

[chanduthedev]

Hi @Karthik-tr , thank you for pointing out. I also faced same error after adding your code. Actually faceResults is a list with one item and not a json object. So to access descriptor, you need to specify index like faceResults[0].descriptor

Try below code, it should work.

const faceResults = await faceapi.detectAllFaces(img).withFaceLandmarks().withFaceDescriptors()
if(faceResults ) {
   descriptions = [faceResults[0].descriptor]
}
const singlelabeledDescriptor = new faceapi.LabeledFaceDescriptors(label,descriptions )

[karthik-Gopalan]

Yes i use a single face detector. Hence I made the mistake of assuming that the descriptor only has one object. Mine works well. Thanks for the inputs