class_docstr: Log reader to read vdl log, support for frontend api in lib.py.
  
      
code: def _get_file_reader(self, file_path, update=True):
      if update:
          self.register_reader(file_path)
          self.reader = self.readers[file_path]
          self.reader.dir = file_path
          return self.reader
      else:
          reader = RecordReader(filepath=file_path)
          return reader
  
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 16 for calling the LogReader obj's underlying member method code with example usage: obj._get_file_reader(file_path, update) and returns: self, reader