class_docstr: Resolve anything that's hosted under detectron2's namespace.
code: def _open(self, path, mode="r", **kwargs):
      return PathManager.open(
          self.S3_DETECTRON2_PREFIX + path[len(self.PREFIX) :],
          mode,
          **kwargs,
      )
  
imports: from iopath.common.file_io import HTTPURLHandler, OneDrivePathHandler, PathHandler
  from iopath.common.file_io import PathManager
label_desc: Use image node_id 3 for calling the Detectron2Handler obj's underlying member method code with example usage: obj._open(path, mode) and returns: PathManager