class_docstr: Base class for all processors 
class_docstr_tok: ["Base","class","for","all","processors"]
code: def requires(self):
      return self._requires
  
imports: from abc import ABC, abstractmethod
  from stanza.models.common.doc import Document
  from stanza.pipeline.registry import NAME_TO_PROCESSOR_CLASS, PIPELINE_NAMES, PROCESSOR_VARIANTS
label_desc: Use image node_id 12 for calling the Processor obj's underlying member method code with example usage: obj.requires() and returns: self