class_docstr: Base class for all vision handlers
code: def get_max_result_classes(self):
      return self.topk
  
file_path: serve/examples/nvidia_dali/custom_handler.py
imports: from torch.profiler import ProfilerActivity
  from ts.torch_handler.dali_handler import DALIHandler
label_desc: Use image node_id 4 for calling the DALIMNISTDigitClassifier obj's underlying member method code with example usage: obj.get_max_result_classes() and returns: self