code: def read(self, image_feat_path):
      if not image_feat_path.endswith(
          "npy"
      ) and not image_feat_path.endswith("pth"):
          return None
      image_feat_path = os.path.join(self.base_path, image_feat_path)
  
      if self.feat_reader is None:
          # Currently all lmdb features are with ndim == 2 so we are
          # avoiding loading the lmdb to determine feature ndim
          if not self.base_path.endswith(".lmdb") and self.ndim is None:
              feat = load_feat(image_feat_path)
              self.ndim = feat.ndim
          self._init_reader()
  
      return self.feat_reader.read(image_feat_path)
  
imports: import math
  import os
  import pickle
  from typing import Any
  import lmdb
  import numpy
  import torch
  from mmf.utils.file_io import PathManager
label_desc: Use image node_id 3 for calling the FeatureReader obj's underlying member method code with example usage: obj.read(image_feat_path) and returns: self, None