code: def after_validate(self):
      if not self.run_projector:
          return
      self.run_projector = False
      self._remove()
      _write_projector_embedding(self.learn, self.writer, self.feat)
  
imports: from __future__ import annotations
  from ..basics import *
  import tensorboard
  from torch.utils.tensorboard import SummaryWriter
  from .fp16 import ModelToHalf
  from .hook import hook_output
  from ..text.all import LMLearner, TextLearner
  from ..vision.data import *
  from ..vision.core import TensorPoint, TensorBBox
label_desc: Use image node_id 3 for calling the TensorBoardBaseCallback obj's underlying member method code with example usage: obj.after_validate() without return types