Add stratified-subset README

README.md

@@ -46,16 +46,17 @@ tags:
 
 # OpenSeeSimE-Structural-Mini
 
-A **stratified 1% subset** of [`cmudrc/OpenSeeSimE-Structural`](https://huggingface.co/datasets/cmudrc/OpenSeeSimE-Structural), intended for quicker iteration, smoke tests, and baseline training on reduced data.
+A **stratified 1% subset** of [`cmudrc/OpenSeeSimE-Structural`](https://huggingface.co/datasets/cmudrc/OpenSeeSimE-Structural) for evaluating vision-language models at a reduced compute footprint while preserving the joint distribution of simulation type, question type, media type, and question id.
 
 ## Subset Provenance
 
 - **Parent dataset**: [`cmudrc/OpenSeeSimE-Structural`](https://huggingface.co/datasets/cmudrc/OpenSeeSimE-Structural) (102,678 rows total)
 - **Rows in this subset**: **1,120** (1.09% of parent)
+- **Source classes**: `Beams`, `Dog Bone`, `Hip Implant`, `Pressure Vessel`, `Wall Bracket`
 - **Parquet shards**: 1   |   **Storage**: ~1.73 GB
 - **Sampling**: per-stratum shuffle with `numpy.random.default_rng(42)`, then take `ceil(n * fraction)` from each stratum. Any non-empty stratum contributes at least 1 row.
 - **Strata**: `(source_file, question_type, media_type, question_id)` — all four jointly.
-- **Nesting**: `Mini ⊂ Small ⊂ parent`. The same shuffled prefix is taken for every fraction, so the 1% subset is a literal subset of the 10% subset.
+- **Nesting**: the 1% subset is a literal subset of the 10% subset (same shuffled prefix is taken for every fraction).
 
 ## Composition
 
@@ -86,11 +87,6 @@ A **stratified 1% subset** of [`cmudrc/OpenSeeSimE-Structural`](https://huggingf
 | Pressure Vessel |       66 |               110 |        44 |     220 |
 | Wall Bracket    |       66 |               110 |        44 |     220 |
 
-## Deviations from Parent
-
-- **`Beam` → `Beams` relabel**: 20 rows in the parent dataset were mislabeled `source_file='Beam'` (singular) when they should have been `'Beams'` (plural). In this subset, those rows have been merged into `'Beams'`. The 5 `source_file` classes in this subset are: `Beams`, `Dog Bone`, `Hip Implant`, `Pressure Vessel`, `Wall Bracket`.
-- **Nested**: `Mini` is a strict subset of `Structural-Small`, which is a strict subset of `cmudrc/OpenSeeSimE-Structural`. Any row appearing in `Mini` also appears in `Structural-Small`.
-
 ## Feature Schema
 
 Identical to the parent dataset. See [`cmudrc/OpenSeeSimE-Structural`](https://huggingface.co/datasets/cmudrc/OpenSeeSimE-Structural) for full documentation of simulation generation, ground-truth extraction, preprocessing, limitations, and intended use.
@@ -113,11 +109,9 @@ Identical to the parent dataset. See [`cmudrc/OpenSeeSimE-Structural`](https://h
 
 ## Intended Use
 
-- Fast smoke-testing of VLM evaluation pipelines before running the full benchmark
-- Baseline training (e.g. CNN baselines) on a reduced footprint
-- Iteration on metric/aggregation code without 100k+ row overhead
-
-For rigorous benchmarking, use the parent dataset.
+- Benchmark evaluation of vision-language models on engineering simulation question answering at reduced compute cost
+- Smoke-testing of evaluation pipelines before running the full benchmark
+- Comparative studies where storage or bandwidth constraints matter
 
 ## License