facenet-service.dart

  setCurrentPrediction(CameraImage cameraImage, Face face) {
    /// crops the face from the image and transforms it to an array of data
    List input = _preProcess(cameraImage, face);

    /// then reshapes input and ouput to model format 🧑‍🔧
    input = input.reshape([1, 112, 112, 3]);
    List output = List(1 * 192).reshape([1, 192]);

    /// runs the interpreter and produces the output 🤖
    this._interpreter.run(input, output);
    output = output.reshape([192]);

    this._predictedData = List.from(output);
  }

the List output is it empty ?