code: def _placeholder_for_empty_chart(
      text_to_display, width=100, height=100, title=""
  ):
      chart = (
          alt.Chart({"values": [{"placeholder": text_to_display}]})
          .mark_text(size=14)
          .encode(text="placeholder:N")
          .properties(width=width, height=height, title=title)
      )
      return chart
  
imports: import io
  import json
  import os
  import altair
  import numpy
  import pandas
  import tensorflow
label_desc: Use image node_id 7 for calling a global function with example usage: _placeholder_for_empty_chart(text_to_display, width, height, title) and returns: chart