code: def basis_cardinality_test_data(self):
      return None
  
file_path: geomstats/tests/tests_geomstats/test_geometry/data/minkowski.py
imports: import math
  import geomstats.backend
  from geomstats.test.data import TestData
  from .riemannian_metric import RiemannianMetricTestData
label_desc: Use image node_id 1 for calling the MinkowskiTestData obj's underlying member method code with example usage: obj.basis_cardinality_test_data() and returns: None