Add prepared soybean PointTransformer dataset (67 train, 11 test)

point_transformer/README.md

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+# Prepared soybean PointTransformer data
+
+`soybean.tar.gz` contains 78 prepared samples: **67 train / 11 test**, no
+validation set, with 76,362,794 points. The archive is 2,239,573,703 bytes;
+extracted files occupy 4,276,590,506 bytes.
+
+Derived from the segmented soybean point clouds in `sample_params.tar.gz`
+in TianhangCheng7/DemeterData using Demeter's
+`script_point_transformer/prepare_data.py`. This is a reproducible split for
+the preparation recipe, not a claim about the original paper's partition.
+Paired `_i` / `_o` scans stay in the same split.
+
+From a clean Demeter checkout:
+
+```bash
+hf download TianhangCheng7/DemeterData point_transformer/soybean.tar.gz point_transformer/soybean.tar.gz.sha256 --repo-type dataset --local-dir outputs/downloads
+(cd outputs/downloads/point_transformer && sha256sum -c soybean.tar.gz.sha256)
+tar -xzf outputs/downloads/point_transformer/soybean.tar.gz
+```
+
+This restores `data/point_transformer/soybean/{train,test}/*.pth` and
+`manifest.json`. Existing data should be moved aside before extraction.
+The manifest preserves coordinate transforms, thresholds, labels, split
+lists and source-path provenance. Source paths need not exist on the new machine.
+
+Each sample stores `coord`, `color`, `normal`, `semantic_gt5`, `instance_gt`,
+`inv_dists`, and `scene_id`. Load with
+`torch.load(path, map_location="cpu", weights_only=True)`.
+Coordinates are centered, normalized and aligned with the stem along +X;
+RGB is in [0, 1]. Semantic labels are 0 leaf, 1 other stem, 2 main stem,
+3 flower, 4 fruit.
+
+`inv_dists = T / max(d, T)`, where `d` is distance to the nearest point in
+another organ instance and `T` is twice the mean within-instance tenth-neighbor
+distance (including the point itself). See the repository's
+`script_point_transformer/readme.md` for full preprocessing details and
+training commands. Local CPU data checks passed; no training accuracy is claimed.

point_transformer/soybean.tar.gz

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+size 2239573703

point_transformer/soybean.tar.gz.sha256

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+oid sha256:894404e6c74c0884c419880a8f4a15b76bac6844c300c7f974eb6549a469005e
+size 82