---
license: mit
library_name: pytorch
pipeline_tag: image-to-image
tags:
  - solar-physics
  - solar-forecasting
  - swin-transformer
  - pytorch
  - aia
  - patch-size-8
datasets:
  - hrrsmjd/AIA_12hour_512x512
---

# Solaris Small Patch 8

This repository contains a Solaris-Small checkpoint trained for 12-hour multi-wavelength solar forecasting, following the Solaris pretraining setup from [Solaris: A Foundation Model of the Sun](https://arxiv.org/abs/2411.16339).

This checkpoint supersedes the earlier patch-size-8 upload. It was trained with a chronological 80/10/10 split, a 24-hour guard band at split boundaries, AdamW weight decay `0.05`, and no EMA weights.

The checkpoint was trained on `hrrsmjd/AIA_12hour_512x512` for 7750 optimizer steps using two history frames (`t-12h`, `t`) to predict all eight pretraining wavelengths at `t+12h`.

## Files

- `solaris_small_patch8_model_state_dict.pt`: reusable PyTorch checkpoint containing `model_state_dict`, learned normalization coefficients, wavelengths, scale factors, patch size, seed, split metadata, test metrics, training step, and final training loss.
- `config.json`: lightweight metadata for reconstructing the model and normalization.
- `assets/solaris_small_patch8_test0_prediction.png`: example qualitative test prediction plot.
- `eval/solaris_pretrain_p8_chronosplit_wd005_noema_test_mse_subset_0941.md`: full chronological test-split raw-scale MSE/RMSE/MAE report.

## Example Plot

The plot below shows one test sample with rows for `input t-12h`, `input t`, `target t+12h`, `prediction t+12h`, and `prediction - target` across all eight wavelengths.

![Solaris Small Patch 8 test prediction](assets/solaris_small_patch8_test0_prediction.png)

## Model Details

- Architecture: `SolarisSmall`
- Patch size: `8`
- Embedding dimension: `256`
- Encoder depths: `(2, 6, 2)`
- Decoder depths: `(2, 6, 2)`
- Output wavelengths: `0094`, `0131`, `0171`, `0193`, `0211`, `0304`, `0335`, `1600`
- Training dataset: `hrrsmjd/AIA_12hour_512x512`
- Training target: 12-hour forecast
- Split scheme: chronological 80/10/10 over valid samples with a 24-hour boundary guard band
- Split counts: train `7541`, validation `939`, test `941`
- Training budget: 7750 optimizer steps, batch size 8, gradient accumulation 4
- Optimizer: AdamW, `lr=5e-4`, cosine decay to `5e-5`, `weight_decay=0.05`, betas `(0.9, 0.95)`
- EMA: disabled
- Seed: `42`

## Loading

```python
import torch

from solaris.model.solaris import SolarisSmall

checkpoint = torch.load("solaris_small_patch8_model_state_dict.pt", map_location="cpu", weights_only=False)

model = SolarisSmall(
    out_levels=len(checkpoint["wavelengths"]),
    patch_size=checkpoint["patch_size"],
)
model.load_state_dict(checkpoint["model_state_dict"])
model.eval()

scale_factors = torch.tensor(checkpoint["scale_factors"], dtype=torch.float32)
norm_coeff_1 = checkpoint["norm_coeff_1"]
norm_coeff_2 = checkpoint["norm_coeff_2"]
```

Inputs should be normalized with the Solaris transform used during training. Model outputs are normalized intensities; multiply by the per-wavelength scale factors before comparing to raw-intensity targets.

## Test Metrics

Metrics below use all 941 chronological test samples and are computed on the raw intensity scale.

| Wavelength (A) | MSE | RMSE | MAE |
|---:|---:|---:|---:|
| 0094 | 7.08928 | 2.66257 | 0.310692 |
| 0131 | 147.528 | 12.1461 | 1.44793 |
| 0171 | 13730.9 | 117.179 | 52.9684 |
| 0193 | 22906.6 | 151.349 | 62.3088 |
| 0211 | 7752.18 | 88.0464 | 35.0413 |
| 0304 | 1556.87 | 39.4572 | 14.2213 |
| 0335 | 48.0333 | 6.9306 | 2.0811 |
| 1600 | 145.126 | 12.0468 | 7.3929 |
| **Mean** | **5786.78** | **53.7272** | **21.9716** |

## Training Notes

Scale factors were computed as half the average per-image maximum over unique train-split timestamps:

```text
[57.944149103084534, 214.99738922760267, 1590.2998402078304, 2397.489401917806, 1080.261734048243, 830.778793198845, 104.45557294825853, 274.65685334356664]
```

The final logged training-batch metrics at step 7750 were:

```text
weighted MAE: 0.007597
mean raw RMSE: 19.576
per-wavelength raw RMSE: [1.210, 4.034, 49.249, 53.399, 20.770, 17.612, 1.653, 8.684]
```