class_docstr: Log reader to read vdl log, support for frontend api in lib.py.
  
      
code: def logdir(self):
      return self.dir
  
imports: import collections
  import os
  from functools import partial
  from visualdl.component import components
  from visualdl.io import bfile
  from visualdl.proto import record_pb2
  from visualdl.reader.record_reader import RecordReader
  from visualdl.server.data_manager import default_data_manager
  from visualdl.utils.string_util import decode_tag
  from visualdl.utils.string_util import encode_tag
label_desc: Use image node_id 4 for calling the LogReader obj's underlying member method code with example usage: obj.logdir() and returns: self