class_docstr: A single training/test example.
class_docstr_tok: ["A","single","training\/test","example","."]
code: def __init__(
      self, idx, source, target, url=None, task="", sub_task=""
  ):
      self.idx = idx
      self.source = source
      self.target = target
      self.url = url
      self.task = task
      self.sub_task = sub_task
  
imports: import json
label_desc: Use image node_id 1 to create a new Example object from inherited base classes: object with example: obj = Example(idx, source, target, url, task, sub_task)