question: Override .ckpt in ModelCheckpoint Callback
context: Hi,
  I'm using ModelCheckpoint Callback to save my model checkpoint. pytorch lightning automatically attaches -v0, -v1 to the filename I specified if it finds checkpoint models exist in dirpath.  Instead of saving all the models from different runs, is there a way to make the ModelCheckpoint Callback only save one model in the checkpoint folder and just override the model from previous runs?
  For example, my ModelCheckpoint is as follow:
  ModelCheckpoint(monitor='valid_score',
                                dirpath="./checkpoint/",
                                filename="model",
                                mode='max', save_top_k=1))
  
  If I run the code for 3 three times, my checkpoints folder will have the following:
  - checkpoint:
      - model.ckpt
      - model-v0.ckpt
      - model-v1.ckpt
  
  Would it be possible to just have model.ckpt in my checkpoint folder no matter how many times I run the code?
answer: We don't support this, but you could always remove the file manually between runs with os.remove()