class_docstr: Log writer to write vdl records to log file.
  
  The class `LogWriter` provides APIs to create record file and add records to
  it. The class updates log file asynchronously without slowing down training.
class_docstr_tok: ["Log","writer","to","write","vdl","records","to","log","file",".","The","class","`","LogWriter","`","provides","APIs","to","create","record","file","and","add","records","to","it",".","The","class","updates","log","file","asynchronously","without","slowing","down","training","."]
docstr: Add an text to vdl record file.
  Args:
      tag (string): Data identifier
      text_string (string): Value of text
      step (int): Step of text
      walltime (int): Wall time of text
  Example:
      for index in range(1, 101):
          writer.add_text(tag="train/loss", text_string=str(index) + 'text', step=index)
code: def add_text(self, tag, text_string, step=None, walltime=None):
      """Add an text to vdl record file.
      Args:
          tag (string): Data identifier
          text_string (string): Value of text
          step (int): Step of text
          walltime (int): Wall time of text
      Example:
          for index in range(1, 101):
              writer.add_text(tag="train/loss", text_string=str(index) + 'text', step=index)
      """
      if "%" in tag:
          raise RuntimeError("% can't appear in tag!")
      walltime = (
          round(time.time() * 1000) if walltime is None else walltime
      )
      self._get_file_writer().add_record(
          text(
              tag=tag,
              text_string=text_string,
              step=step,
              walltime=walltime,
          )
      )
  
imports: import os
  import time
  import numpy
  from visualdl.component.base_component import audio
  from visualdl.component.base_component import embedding
  from visualdl.component.base_component import histogram
  from visualdl.component.base_component import hparam
  from visualdl.component.base_component import image
  from visualdl.component.base_component import meta_data
  from visualdl.component.base_component import pr_curve
  from visualdl.component.base_component import roc_curve
  from visualdl.component.base_component import scalar
  from visualdl.component.base_component import scalars
  from visualdl.component.base_component import text
  from visualdl.component.graph import translate_graph
  from visualdl.io import bfile
  from visualdl.server.log import logger
  from visualdl.utils.figure_util import figure_to_image
  from visualdl.utils.img_util import merge_images
  from visualdl.utils.md5_util import md5
  from visualdl.writer.record_writer import RecordFileWriter
label_desc: Use image node_id 10 for calling the LogWriter obj's underlying member method code with example usage: obj.add_text(tag, text_string, step, walltime) without return types