Lightning-AI / Lightning-AI/pytorch-lightning
I can not save checkpoints in checkpoints epochs
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- Python
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Description
### Bug description
When I ran the program to train the model, I couldn't save checkpoints after a certain epoch, but instead of getting an error, the model skipped saving and continued training
### What version are you seeing the problem on?
v2.5
### How to reproduce the bug
```python
default_modelckpt_cfg = {
"target": "pytorch_lightning.callbacks.ModelCheckpoint",
"params": {
"dirpath": ckptdir,
"filename": "{epoch:04}",
"verbose": True,
"save_last": False,
"every_n_epochs": 1,
"save_top_k": -1, # save all checkpoints
}
}
modelckpt_cfg = lightning_config.modelcheckpoint
modelckpt_cfg = OmegaConf.merge(default_modelckpt_cfg, modelckpt_cfg)
default_callbacks_cfg["checkpoint_callback"] = modelckpt_cfg
if "callbacks" in lightning_config:
callbacks_cfg = lightning_config.callbacks
else:
callbacks_cfg = OmegaConf.create()
callbacks_cfg = OmegaConf.merge(default_callbacks_cfg, callbacks_cfg)
trainer_kwargs["callbacks"] = [
instantiate_from_config(callbacks_cfg[k]) for k in callbacks_cfg]
trainer = Trainer(**trainer_config, **trainer_kwargs, num_nodes=opt.num_nodes)
```
### Error messages and logs
```
# Error messages and logs here please
```
### Environment
Current environment
```
#- PyTorch Lightning Version (e.g., 2.5.0):
#- PyTorch Version (e.g., 2.2.2):
#- Python version (e.g., 3.10):
#- OS (e.g., Linux):
```
### More info
_No response_
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the reported configuration with PyTorch Lightning's ModelCheckpoint, especially every_n_epochs=1 and save_top_k=-1, using the Trainer construction shown. Inspect how the checkpoint callback handles the first skipped save and compare the configured checkpoint directory and filename pattern. Done means checkpoint saves are attempted for the expected epochs and failures are reported instead of silently allowing training to continue.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python, pytorch
- Domain
- machine-learning
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100