code: def encode_plot_to_base64(plt):
      with BytesIO() as output_bytes:
          plt.savefig(output_bytes, format="png")
          bytes_data = output_bytes.getvalue()
      base64_str = str(base64.b64encode(bytes_data), "utf-8")
      return "data:image/png;base64," + base64_str
  
imports: from __future__ import annotations
  import base64
  import hashlib
  import json
  import logging
  import os
  import shutil
  import subprocess
  import tempfile
  import warnings
  from io import BytesIO
  from pathlib import Path
  from typing import TYPE_CHECKING, Any, Literal
  import httpx
  import numpy
  from gradio_client import utils
  from PIL import Image, ImageOps, PngImagePlugin
  from gradio import wasm_utils
  from gradio.data_classes import FileData, GradioModel, GradioRootModel
  from gradio.utils import abspath
label_desc: Use image node_id 3 for calling a global function with example usage: encode_plot_to_base64(plt) and returns: unknown