class_docstr: The file paths relevant to load a shard of the extract features
class_docstr_tok: ["The","file","paths","relevant","to","load","a","shard","of","the","extract","features"]
code: def num_samples(self) -> int:
      return self.features.shape[0]
  
file_path: vissl/vissl/utils/extract_features_utils.py
imports: import logging
  import os
  import re
  from typing import List, NamedTuple
  import numpy
  from iopath.common.file_io import g_pathmgr
  from vissl.utils.io import load_file, makedir
label_desc: Use image node_id 1 for calling the ExtractedFeatures obj's underlying member method code with example usage: obj.num_samples() and returns: self