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README.md

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+---
+license: mit
+language:
+  - sa
+task_categories:
+  - token-classification
+  - other
+tags:
+  - sanskrit
+  - samasa
+  - sandhi
+  - compounding
+  - vigraha
+  - vyakarana
+  - boundary-detection
+---
+
+# Sanskrit Sandhi + Samas Boundary Dataset — V3
+
+The canonical merged training dataset for the **sanskrit-sandhi-boundary** model:
+sentence-level **external sandhi** (corpus) + grammar-generated **samas**
+(compounds, all 7 types) in one file.
+
+## Composition
+
+| Source | Rows | Description |
+|--------|------|-------------|
+| sandhi_corpus | 741,803 | running-text word boundaries (external sandhi) from `sanskrit-sandhi-boundaries-v2` |
+| samas | 258,408 | grammar-generated compounds (7 types, laukik + alaukik vigraha) from `sanskrit-samas-v1` |
+| **Total** | **~1,000,211** | one canonical training file |
+
+## Design rationale
+
+The splitter's task at a seam is **phonetically identical** for external sandhi
+and internal compound boundaries — the model must fire at *every* valid seam and
+stay quiet inside single words. Merging (not split-training) lets the shared
+phonetics reinforce both, while the samas rows teach stem-co-occurrence for the
+identity-concat class (no phonetic signal) and the corpus rows keep the real
+distribution. See `benchmarks/PLAN_SAMAS.md`.
+
+## Schema (per row)
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `seq` | string | SLP1 surface (input to the model) |
+| `bnd` | list[int] | Boundary positions (last-char indices of each piece except the last) |
+| `n_boundaries` | int | len(bnd) |
+| `source` | string | `sandhi_corpus` or `samas` |
+| `samasa_type` | string (opt) | one of 7 types, for samas rows |
+| `stem1`, `stem2` | string (opt) | constituent stems, for samas rows |
+| `verified` | bool | always true |
+
+## Samasa type coverage (in the samas portion)
+
+| Type | Meaning | n |
+|------|---------|---|
+| tatpuruṣa | determinative (X of Y) | 62,893 |
+| karmadhāraya | appositional (X that is Y) | 62,893 |
+| dvandva | copulative (X and Y) | 59,924 |
+| bahuvrīhi | exocentric "having X" | 60,172 |
+| avyayībhāva | adverbial | 7,097 |
+| amreḍita | reduplicative | 5,091 |
+| dvigu | numerical | 338 |
+
+## Rebuilding
+
+```bash
+# samas dataset (deterministic, seed 42)
+python3 benchmarks/build_samas_data.py --out data/samas_V1.jsonl
+
+# merged dataset (deterministic, seed 42)
+python3 benchmarks/merge_datasets.py \
+    --sandhi data/train_V2_full.jsonl \
+    --samas data/samas_V1.jsonl \
+    --out data/train_V3_sandhi_samas.jsonl
+```
+
+## Related
+
+- Samas-only: [`sanskrit-samas-v1`](https://huggingface.co/datasets/CodeIsAbstract/sanskrit-samas-v1)
+- Sandhi-only: [`sanskrit-sandhi-boundaries-v2`](https://huggingface.co/datasets/CodeIsAbstract/sanskrit-sandhi-boundaries-v2)
+- Benchmark: [`sanskrit-sandhi-boundary-v2`](https://huggingface.co/CodeIsAbstract/sanskrit-sandhi-boundary-v2) (model)