code: def lgb_dec_tree():
      return lgb.Booster(
          model_file="fixtures/lightgbm_model_classifier.txt"
      )
  
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 1 for calling a global function with example usage: lgb_dec_tree() and returns: lgb