[train] FSDP2 Template: Resume from previous epoch when checkpointing#57938
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matthewdeng merged 6 commits intoray-project:masterfrom Oct 22, 2025
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Signed-off-by: JasonLi1909 <jasli1909@gmail.com>
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This pull request aims to add functionality for resuming training from a specific epoch by saving and loading the epoch number in checkpoints. The implementation correctly modifies AppState to store the epoch and updates the saving logic. However, I've identified a critical bug in the checkpoint loading logic (load_fsdp_checkpoint) where a new AppState object is created for loading, separate from the one used to retrieve the epoch afterwards. This prevents the epoch from being correctly restored, causing training to always resume from the beginning. This issue is present in both the Jupyter notebook and Markdown versions of the example.
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Signed-off-by: JasonLi1909 <jasli1909@gmail.com>
matthewdeng
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Oct 21, 2025
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matthewdeng
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Oct 22, 2025
Co-authored-by: matthewdeng <matthew.j.deng@gmail.com> Signed-off-by: Jason Li <57246540+JasonLi1909@users.noreply.github.com>
xinyuangui2
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Oct 27, 2025
…ray-project#57938) This PR adds persistent epoch data to the checkpointing logic in the [FSDP2 Template](https://docs.ray.io/en/master/train/examples/pytorch/pytorch-fsdp/README.html). This PR includes: - New logic for saving the epoch into a distributed checkpoint - New logic for resuming training from the saved epoch in a loaded checkpoint - Updates the [OSS FSDP2 example](https://docs.ray.io/en/master/train/examples/pytorch/pytorch-fsdp/README.html) to include the new logic Passing release test: https://buildkite.com/ray-project/release/builds/64867#019a08e3-1a3e-4fc5-9633-b8e3a0b0f34f --------- Signed-off-by: JasonLi1909 <jasli1909@gmail.com> Signed-off-by: Jason Li <57246540+JasonLi1909@users.noreply.github.com> Co-authored-by: matthewdeng <matthew.j.deng@gmail.com> Signed-off-by: xgui <xgui@anyscale.com>
landscapepainter
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Nov 17, 2025
…ray-project#57938) This PR adds persistent epoch data to the checkpointing logic in the [FSDP2 Template](https://docs.ray.io/en/master/train/examples/pytorch/pytorch-fsdp/README.html). This PR includes: - New logic for saving the epoch into a distributed checkpoint - New logic for resuming training from the saved epoch in a loaded checkpoint - Updates the [OSS FSDP2 example](https://docs.ray.io/en/master/train/examples/pytorch/pytorch-fsdp/README.html) to include the new logic Passing release test: https://buildkite.com/ray-project/release/builds/64867#019a08e3-1a3e-4fc5-9633-b8e3a0b0f34f --------- Signed-off-by: JasonLi1909 <jasli1909@gmail.com> Signed-off-by: Jason Li <57246540+JasonLi1909@users.noreply.github.com> Co-authored-by: matthewdeng <matthew.j.deng@gmail.com>
Aydin-ab
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Nov 19, 2025
…ray-project#57938) This PR adds persistent epoch data to the checkpointing logic in the [FSDP2 Template](https://docs.ray.io/en/master/train/examples/pytorch/pytorch-fsdp/README.html). This PR includes: - New logic for saving the epoch into a distributed checkpoint - New logic for resuming training from the saved epoch in a loaded checkpoint - Updates the [OSS FSDP2 example](https://docs.ray.io/en/master/train/examples/pytorch/pytorch-fsdp/README.html) to include the new logic Passing release test: https://buildkite.com/ray-project/release/builds/64867#019a08e3-1a3e-4fc5-9633-b8e3a0b0f34f --------- Signed-off-by: JasonLi1909 <jasli1909@gmail.com> Signed-off-by: Jason Li <57246540+JasonLi1909@users.noreply.github.com> Co-authored-by: matthewdeng <matthew.j.deng@gmail.com> Signed-off-by: Aydin Abiar <aydin@anyscale.com>
Future-Outlier
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Dec 7, 2025
…ray-project#57938) This PR adds persistent epoch data to the checkpointing logic in the [FSDP2 Template](https://docs.ray.io/en/master/train/examples/pytorch/pytorch-fsdp/README.html). This PR includes: - New logic for saving the epoch into a distributed checkpoint - New logic for resuming training from the saved epoch in a loaded checkpoint - Updates the [OSS FSDP2 example](https://docs.ray.io/en/master/train/examples/pytorch/pytorch-fsdp/README.html) to include the new logic Passing release test: https://buildkite.com/ray-project/release/builds/64867#019a08e3-1a3e-4fc5-9633-b8e3a0b0f34f --------- Signed-off-by: JasonLi1909 <jasli1909@gmail.com> Signed-off-by: Jason Li <57246540+JasonLi1909@users.noreply.github.com> Co-authored-by: matthewdeng <matthew.j.deng@gmail.com> Signed-off-by: Future-Outlier <eric901201@gmail.com>
Blaze-DSP
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Dec 18, 2025
…ray-project#57938) This PR adds persistent epoch data to the checkpointing logic in the [FSDP2 Template](https://docs.ray.io/en/master/train/examples/pytorch/pytorch-fsdp/README.html). This PR includes: - New logic for saving the epoch into a distributed checkpoint - New logic for resuming training from the saved epoch in a loaded checkpoint - Updates the [OSS FSDP2 example](https://docs.ray.io/en/master/train/examples/pytorch/pytorch-fsdp/README.html) to include the new logic Passing release test: https://buildkite.com/ray-project/release/builds/64867#019a08e3-1a3e-4fc5-9633-b8e3a0b0f34f --------- Signed-off-by: JasonLi1909 <jasli1909@gmail.com> Signed-off-by: Jason Li <57246540+JasonLi1909@users.noreply.github.com> Co-authored-by: matthewdeng <matthew.j.deng@gmail.com>
peterxcli
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Feb 25, 2026
…ray-project#57938) This PR adds persistent epoch data to the checkpointing logic in the [FSDP2 Template](https://docs.ray.io/en/master/train/examples/pytorch/pytorch-fsdp/README.html). This PR includes: - New logic for saving the epoch into a distributed checkpoint - New logic for resuming training from the saved epoch in a loaded checkpoint - Updates the [OSS FSDP2 example](https://docs.ray.io/en/master/train/examples/pytorch/pytorch-fsdp/README.html) to include the new logic Passing release test: https://buildkite.com/ray-project/release/builds/64867#019a08e3-1a3e-4fc5-9633-b8e3a0b0f34f --------- Signed-off-by: JasonLi1909 <jasli1909@gmail.com> Signed-off-by: Jason Li <57246540+JasonLi1909@users.noreply.github.com> Co-authored-by: matthewdeng <matthew.j.deng@gmail.com> Signed-off-by: peterxcli <peterxcli@gmail.com>
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This PR adds persistent epoch data to the checkpointing logic in the FSDP2 Template.
This PR includes:
Passing release test: https://buildkite.com/ray-project/release/builds/64867#019a08e3-1a3e-4fc5-9633-b8e3a0b0f34f