- `utils.estimator_checks.check_sample_weights_invariance`
  replaced by
  `utils.estimator_checks.check_sample_weight_equivalence_on_dense_data`
  which uses integer (including zero) weights and
  `utils.estimator_checks.check_sample_weight_equivalence_on_sparse_data`
  which does the same on sparse data.
  By :user:`Antoine Baker <antoinebaker>`
