code: def __getitem__(self, idx):
      return self.anchors[idx], self.positives[idx], self.labels[idx]
  
file_path: pytorch-metric-learning/tests/testers/test_global_two_stream_embedding_space_tester.py
imports: import unittest
  import numpy
  import torch
  from pytorch_metric_learning.testers import GlobalTwoStreamEmbeddingSpaceTester
  from pytorch_metric_learning.utils import accuracy_calculator
  from ..zzz_testing_utils.testing_utils import angle_to_coord
label_desc: Use image node_id 3 for calling the FakeDataset obj's underlying member method code with example usage: obj.__getitem__(idx) and returns: self,  self,  self