class_docstr: Dataset loader for Libsvm data format 
class_docstr_tok: ["Dataset","loader","for","Libsvm","data","format"]
code: def __len__(self):
      return self.nsamples
  
imports: import calendar
  import os
  import time
  import requests
  import json
  from typing import List, Dict
  import traceback
  import orjson
  from argparse import Namespace
  from shared_config import parse_config_arguments
  from torch.utils.data import Dataset
  import torch
label_desc: Use image node_id 4 for calling the LibsvmDataset obj's underlying member method code with example usage: obj.__len__() and returns: self