code: def test_get_node_samples(shadow_dec_tree: ShadowLightGBMTree):
      node_samples = shadow_dec_tree.get_node_samples()
      assert len(node_samples[0]) == 712
      assert len(node_samples[1]) == 245
      assert len(node_samples[8]) == 95
      assert len(node_samples[3]) == 110
      assert len(node_samples[13]) == 340
      assert len(node_samples[17]) == 196
      assert len(node_samples[21]) == 86
  
file_path: dtreeviz/testing/testlib/models/test_decision_tree_lightgbm_classifier.py
imports: import lightgbm
  import pytest
  from dtreeviz.models.lightgbm_decision_tree import ShadowLightGBMTree
  import numpy
label_desc: Use image node_id 13 for calling a global function with example usage: test_get_node_samples(shadow_dec_tree) without return types