code: def loss_test_data(self):
      data = [
          dict(
              point=gs.array([0.5, 0.5]),
              point_context=gs.array([0.6, 0.6]),
              point_negative=gs.array([-0.4, -0.4]),
              expected_loss=gs.array([1.00322045]),
              expected_grad=gs.array([[-0.16565083, -0.16565083]]),
          ),
      ]
      return self.generate_tests(data)
  
file_path: geomstats/tests/tests_geomstats/test_datasets/data/prepare_graph_data.py
imports: import geomstats.backend
  from geomstats.datasets.utils import load_karate_graph
  from geomstats.test.data import TestData
label_desc: Use image node_id 3 for calling the HyperbolicEmbeddingTestData obj's underlying member method code with example usage: obj.loss_test_data() and returns: self