docs: def build_config(dataset, datasets_dir, phase, problem=None, output_dir='data/output'):
      """
      root@d3m-example-pod:/# cat /input/185_baseball/test_config.json
      {
        "problem_schema": "/input/TEST/problem_TEST/problemDoc.json",
        "problem_root": "/input/TEST/problem_TEST",
        "dataset_schema": "/input/TEST/dataset_TEST/datasetDoc.json",
        "test_data_root": "/input/TEST/dataset_TEST",
        "results_root": "/output/predictions",
        "executables_root": "/output/executables",
        "temp_storage_root": "/output/supporting_files"
      }
      root@d3m-example-pod:/# cat /input/185_baseball/search_config.json
      {
        "problem_schema": "/input/TRAIN/problem_TRAIN/problemDoc.json",
        "problem_root": "/input/TRAIN/problem_TRAIN",
        "dataset_schema": "/input/TRAIN/dataset_TRAIN/datasetDoc.json",
        "training_data_root": "/input/TRAIN/dataset_TRAIN",
        "pipeline_logs_root": "/output/pipelines",
        "executables_root": "/output/executables",
        "user_problems_root": "/output/user_problems",
        "temp_storage_root": "/output/supporting_files"
      }
  
      """
  
      if problem:
          full_phase = phase + '_' + problem
      else:
          full_phase = phase
  
      root_dir = os.path.join(datasets_dir, dataset, full_phase)
      problem_root = os.path.join(root_dir, 'problem_' + phase)
      data_root = os.path.join(root_dir, 'dataset_' + phase)
  
      config = {
          'problem_root': problem_root,
          'problem_schema': os.path.join(problem_root, 'problemDoc.json'),
          'dataset_schema': os.path.join(data_root, 'datasetDoc.json'),
          'executables_root': os.path.join(output_dir, 'executables'),
          'temp_storage_root': os.path.join(output_dir, 'supporting_files'),
      }
  
      if phase == 'TRAIN':
          config['training_data_root'] = data_root
          config['pipeline_logs_root'] = os.path.join(output_dir, 'pipelines')
      else:
          config['test_data_root'] = data_root
          config['results_root'] = os.path.join(output_dir, 'predictions')
  
      return config