class_docstr: A specific iterator for reading trees from a tree file
  
  The idea is that this will keep track of which line
  we are processing, so that an error can be logged
  from the correct line
class_docstr_tok: ["A","specific","iterator","for","reading","trees","from","a","tree","file","The","idea","is","that","this","will","keep","track","of","which","line","we","are","processing",",","so","that","an","error","can","be","logged","from","the","correct","line"]
docstr: The mark is used for determining where the start of a tree occurs for an error
docstr_tok: ["The","mark","is","used","for","determining","where","the","start","of","a","tree","occurs","for","an","error"]
code: def set_mark(self):
      """
      The mark is used for determining where the start of a tree occurs for an error
      """
      self.mark = self.line_num
  
imports: from collections import deque
  import logging
  import os
  import re
  from stanza.models.constituency.parse_tree import Tree
  from stanza.utils.get_tqdm import get_tqdm
label_desc: Use image node_id 2 for calling the TokenIterator obj's underlying member method code with example usage: obj.set_mark() without return types