code: def close(self):
      del self.vis
      del self.scalar_dict
      gc.collect()
  
imports: import gc
  import numpy
  import math
  import json
  import time
  from .summary import compute_curve
  from .utils import figure_to_image
  from .x2num import make_np
label_desc: Use image node_id 17 for calling the VisdomWriter obj's underlying member method code with example usage: obj.close() without return types