class_docstr: Protocol definition of a Dataset.
  
  Note: no __add__ method is defined.
class_docstr_tok: ["Protocol","definition","of","a","Dataset",".","Note",":","no","__add__","method","is","defined","."]
code: def __len__(self) -> int:
      ...
  
imports: from typing import TypeVar, SupportsInt, Sequence
  from torch.utils.data.dataset import Dataset
  from typing_extensions import Protocol
label_desc: Use image node_id 2 for calling the IDataset obj's underlying member method code with example usage: obj.__len__() without return types