code: def dump_to_str(self, obj, **kwargs):
      kwargs.setdefault("default", set_default)
      return json.dumps(obj, **kwargs)
  
file_path: lavis/lavis/common/annotator/uniformer/mmcv/fileio/handlers/json_handler.py
imports: import json
  import numpy
  from .base import BaseFileHandler
label_desc: Use image node_id 3 for calling the JsonHandler obj's underlying member method code with example usage: obj.dump_to_str(obj) and returns: json