code: def __init__(self):
      self.index_for_css = "graph"
      # Some graphs save the underlying data
      self.data = {}
      return
  
file_path: sweetviz/sweetviz/graph.py
imports: import matplotlib
  import os.path
  import matplotlib.pyplot
  import matplotlib.font_manager
  from io import BytesIO
  import base64
  from pkg_resources import resource_filename
  from pandas.plotting import register_matplotlib_converters
  from sweetviz import sv_html_formatters
  from sweetviz.config import config
label_desc: Use image node_id 1 to create a new Graph object  with example: obj = Graph()