docstr: Unit test check label dict 2
code: def test_check_label_dict_2(self):
      """
      Unit test check label dict 2
      """
      label_dict = {}
      _case = "regression"
      check_label_dict(label_dict, _case)
  
imports: import unittest
  import pytest
  import pandas
  import numpy
  import category_encoders
  from shapash.utils.check import check_preprocessing, check_model, check_label_dict, check_mask_params, check_y, check_contribution_object, check_preprocessing_options, check_postprocessing, check_consistency_model_features, check_consistency_model_label, check_additional_data
  from sklearn.compose import ColumnTransformer
  import sklearn.preprocessing
  import types
  import sklearn.ensemble
  import sklearn.svm
  import sklearn.linear_model
  import xgboost
  import lightgbm
  import catboost
label_desc: Use image node_id 8 for calling the TestCheck obj's underlying member method code with example usage: obj.test_check_label_dict_2() without return types