class_docstr: Saves model topology, losses & metrics for tensorboard and tensorboard projector during training
code: def before_validate(self):
      if self.projector:
          self._setup_projector()
  
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 5 for calling the TensorBoardCallback obj's underlying member method code with example usage: obj.before_validate() without return types