class_docstr: A simplified implementation of the FlaggingCallback abstract class
  provided for illustrative purposes.  Each flagged sample (both the input and output data)
  is logged to a CSV file on the machine running the gradio app.
  Example:
      import gradio as gr
      def image_classifier(inp):
          return {'cat': 0.3, 'dog': 0.7}
      demo = gr.Interface(fn=image_classifier, inputs="image", outputs="label",
                          flagging_callback=SimpleCSVLogger())
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code: def flag(
      self,
      flag_data: list[Any],
      flag_option: str = "",
      username: str | None = None,
  ) -> int:
      flagging_dir = self.flagging_dir
      log_filepath = Path(flagging_dir) / "log.csv"
  
      csv_data = []
      for component, sample in zip(self.components, flag_data):
          save_dir = Path(
              flagging_dir
          ) / client_utils.strip_invalid_filename_characters(
              component.label or ""
          )
          save_dir.mkdir(exist_ok=True)
          csv_data.append(
              component.flag(
                  sample,
                  save_dir,
              )
          )
  
      with open(log_filepath, "a", newline="") as csvfile:
          writer = csv.writer(csvfile)
          writer.writerow(utils.sanitize_list_for_csv(csv_data))
  
      with open(log_filepath) as csvfile:
          line_count = len(list(csv.reader(csvfile))) - 1
      return line_count
  
imports: from __future__ import annotations
  import csv
  import datetime
  import json
  import os
  import time
  import uuid
  from abc import ABC, abstractmethod
  from collections import OrderedDict
  from pathlib import Path
  from typing import TYPE_CHECKING, Any
  import filelock
  import huggingface_hub
  from gradio_client import utils
  from gradio_client.documentation import document, set_documentation_group
  import gradio
  from gradio import utils
label_desc: Use image node_id 3 for calling the SimpleCSVLogger obj's underlying member method code with example usage: obj.flag(flag_data, flag_option, username) and returns: line_count