code: def __len__(self):
      return len(self.annotations_dict["annotations"])
  
imports: from icevision.imports import *
  from icevision.core import *
  from icevision.utils import *
  from icevision.parsers import *
label_desc: Use image node_id 3 for calling the COCOBaseParser obj's underlying member method code with example usage: obj.__len__() and returns: len