code: def reset_feature_fraction(boosting_round):
      return 0.6 if boosting_round < 15 else 0.8
  
file_path: LightGBM/tests/python_package_test/test_callback.py
imports: import pytest
  import lightgbm
  from .utils import SERIALIZERS, pickle_and_unpickle_object
label_desc: Use image node_id 1 for calling a global function with example usage: reset_feature_fraction(boosting_round) and returns: unknown