code: def plotly_line_graph():
      cli = tw.WatcherClient()
      s1 = cli.create_stream(
          event_name="ev_i",
          expr="map(lambda v:(v.x, math.sqrt(v.val)), l)",
      )
  
      p = tw.plotly.line_plot.LinePlot()
      p.subscribe(s1)
      p.show()
  
      utils.wait_key()
  
file_path: tensorwatch/test/simple_log/cli_ij.py
imports: import tensorwatch
  import time
  import math
  from tensorwatch import utils
label_desc: Use image node_id 4 for calling a global function with example usage: plotly_line_graph() without return types