code: def empty_predictor(x):
      return [
          {
              "labels": torch.empty(0),
              "boxes": torch.empty(0, 4),
              "scores": torch.empty(0),
          }
      ]
  
file_path: detecto/detecto/tests/helpers.py
imports: import os
  import torch
  from detecto.core import Model, Dataset
  from detecto.utils import xml_to_csv, read_image
label_desc: Use image node_id 4 for calling a global function with example usage: empty_predictor(x) and returns: list