class_docstr: Class that defines the methods necessary to hook into process.
code: def on_preprocess_end(self, *args, **kwargs):
      self.preprocess_profiler.__exit__(None, None, None)
      del self.preprocess_profiler
  
file_path: ludwig/ludwig/benchmarking/profiler_callbacks.py
imports: from typing import Any, Dict
  from ludwig.api_annotations import DeveloperAPI
  from ludwig.benchmarking.profiler import LudwigProfiler
  from ludwig.callbacks import Callback
  from ludwig.constants import EVALUATION, PREPROCESSING, TRAINING
label_desc: Use image node_id 3 for calling the LudwigProfilerCallback obj's underlying member method code with example usage: obj.on_preprocess_end() without return types