code: def test_mean_shape_with_init(kind, mean, get_mats):
      """Test the shape of mean with init"""
      n_matrices, n_channels = 5, 3
      mats = get_mats(n_matrices, n_channels, kind)
      C = mean(mats, init=mats[0])
      assert C.shape == (n_channels, n_channels)
  
imports: import numpy
  from scipy.stats import gmean
  import pytest
  from pytest import approx
  from pyriemann.utils.geodesic import geodesic_riemann
  from pyriemann.utils.mean import mean_covariance, mean_ale, mean_alm, mean_euclid, mean_harmonic, mean_identity, mean_kullback_sym, mean_logdet, mean_logeuclid, mean_power, mean_riemann, mean_wasserstein, maskedmean_riemann, nanmean_riemann
label_desc: Use image node_id 2 for calling a global function with example usage: test_mean_shape_with_init(kind, mean, get_mats) without return types