code: def _dict_to_str(dictionnary):
      string = "{"
      for key, value in dictionnary.items():
          string += "%s: %.2f," % (str(key), value)
      string += "}"
      return string
  
imports: import os
  import torchnet
  import torch
  from typing import Dict, Any
  import wandb
  from torch.utils.tensorboard import SummaryWriter
  import logging
  from torch_points3d.models import model_interface
label_desc: Use image node_id 14 for calling the BaseTracker obj's underlying member method code with example usage: obj._dict_to_str(dictionnary) and returns: string