code: def test_add_to_indexer(self):
      inference_model = InferenceModel(
          trunk=self.model, data_device=TEST_DEVICE
      )
      inference_model.knn_func.index = faiss.IndexFlatL2(512)
      inference_model.add_to_knn(self.dataset)
      self.helper_assertions(inference_model)
  
imports: import os
  import unittest
  import uuid
  import faiss
  import torch
  import torchvision
  from torchvision import datasets, transforms
  from pytorch_metric_learning.utils.inference import InferenceModel
  from ..None import TEST_DEVICE
label_desc: Use image node_id 5 for calling the TestInference obj's underlying member method code with example usage: obj.test_add_to_indexer() without return types