| # Checkpoint layout |
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| Training writes to a **single directory per architecture**, under `checkpoints/`: |
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| | Arch | Default folder | Env override | |
| |--------|------------------------|---------------------------| |
| | `cnn` | `checkpoints/cnn_baseline/` | `ARTY_CHECKPOINT_CNN_DIR` | |
| | `cnnrnn` | `checkpoints/cnnrnn/` | `ARTY_CHECKPOINT_CNNRNN_DIR` | |
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| Each folder contains: |
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| - `best.pt` — best val loss (for eval / upload) |
| - `last.pt` — latest epoch (for `--resume`) |
| - `train_log.csv` — per-epoch metrics |
| - `results_summary.csv` — summary written at end of training |
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| `ARTY_CHECKPOINT_*` values are **paths relative to `checkpoints/`** (e.g. `cnn/mar17` for nested runs). |
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