Create README.md

README.md

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+## Summary
+This dataset contains spectral classification tasks built for tool-using models.
+Each example includes a full-spectrum image, a chat-style prompt, and ground-truth
+labels for binary decisions. The metadata also provides the underlying spectral
+arrays (wavelength and flux) to support visualization or custom feature extraction.
+
+## Data Files
+All files are under `benchmark/data` and share the same schema.
+File suffixes correspond to target classes:
+
+- `cc` -> Carbon Star (C-type) (data_source: `carbon`)
+- `cv` -> Cataclysmic Variable (CV)
+- `gm` -> M-type Giant (gM)
+- `ss` -> S-type Star
+- `wd` -> White Dwarf (WD)
+
+## Splits and Sizes
+
+| split | file | rows |
+| --- | --- | --- |
+| train | train_cc.parquet | 671 |
+| train | train_cv.parquet | 711 |
+| train | train_gm.parquet | 658 |
+| train | train_ss.parquet | 706 |
+| train | train_wd.parquet | 618 |
+| test | test_cc.parquet | 1321 |
+| test | test_cv.parquet | 1458 |
+| test | test_gm.parquet | 1321 |
+| test | test_ss.parquet | 1442 |
+| test | test_wd.parquet | 1212 |
+
+Totals: train 3364, test 6754.
+
+## Data Structure
+Each example contains the following fields:
+
+- `images`: list with a single image object
+- `data_source`: class key string, e.g. `carbon`, `cv`, `gm`, `ss`, `wd`
+- `prompt`: list of chat messages
+  - `role`: message role (`system`, `user`, etc.)
+  - `content`: message text (the user message includes an `<image>` placeholder)
+- `reward_model`: struct with ground-truth labels
+  - `ground_truth`: string label (typically `YES` or `NO`)
+  - `type`: label source (e.g. `rule`)
+- `agent_name`: string identifier for the agent configuration
+- `extra_info`: metadata
+  - `index`: unique id string
+  - `name`: spectrum file name
+  - `tools_kwargs.spectral_visualization_tool.create_kwargs`:
+    - `flux`: list of floats (length ~3909)
+    - `wavelength`: list of floats (length ~3909)
+    - `redshift`: float
+
+## Notes
+- `images` contains the full-spectrum overview image for the example.
+- `extra_info` provides raw arrays to recreate spectrum plots.