{
  "previewOnly": true,
  "rows": 96,
  "bytes": 3306503,
  "features": {
    "sample_id": {
      "dtype": "string",
      "_type": "Value"
    },
    "split": {
      "dtype": "string",
      "_type": "Value"
    },
    "variant": {
      "dtype": "string",
      "_type": "Value"
    },
    "pair_key": {
      "dtype": "string",
      "_type": "Value"
    },
    "session": {
      "dtype": "string",
      "_type": "Value"
    },
    "frame_idx": {
      "dtype": "int64",
      "_type": "Value"
    },
    "global_frame_idx": {
      "dtype": "int64",
      "_type": "Value"
    },
    "source_archive": {
      "dtype": "string",
      "_type": "Value"
    },
    "source_member": {
      "dtype": "string",
      "_type": "Value"
    },
    "source_mat_sha256": {
      "dtype": "string",
      "_type": "Value"
    },
    "unit": {
      "dtype": "string",
      "_type": "Value"
    },
    "point_count": {
      "dtype": "int64",
      "_type": "Value"
    },
    "rotation_degrees": {
      "dtype": "float64",
      "_type": "Value"
    },
    "sensor_names": {
      "feature": {
        "dtype": "string",
        "_type": "Value"
      },
      "length": 6,
      "_type": "Sequence"
    },
    "sensor_xyz_mm": {
      "feature": {
        "feature": {
          "dtype": "float32",
          "_type": "Value"
        },
        "length": 3,
        "_type": "Sequence"
      },
      "length": 6,
      "_type": "Sequence"
    },
    "sensor_heatmap_peak_uv": {
      "feature": {
        "feature": {
          "dtype": "int64",
          "_type": "Value"
        },
        "length": 2,
        "_type": "Sequence"
      },
      "length": 6,
      "_type": "Sequence"
    },
    "sensor_projected_uv": {
      "feature": {
        "feature": {
          "dtype": "float32",
          "_type": "Value"
        },
        "length": 2,
        "_type": "Sequence"
      },
      "length": 6,
      "_type": "Sequence"
    },
    "sensor_rotations_rowmajor": {
      "feature": {
        "feature": {
          "dtype": "float32",
          "_type": "Value"
        },
        "length": 9,
        "_type": "Sequence"
      },
      "length": 6,
      "_type": "Sequence"
    },
    "bbox": {
      "feature": {
        "dtype": "float32",
        "_type": "Value"
      },
      "length": 4,
      "_type": "Sequence"
    },
    "depth_display_min_mm": {
      "dtype": "float32",
      "_type": "Value"
    },
    "depth_display_max_mm": {
      "dtype": "float32",
      "_type": "Value"
    },
    "depth": {
      "decode": false,
      "_type": "Image"
    },
    "infrared": {
      "decode": false,
      "_type": "Image"
    },
    "labels": {
      "decode": false,
      "_type": "Image"
    },
    "preview_note": {
      "dtype": "string",
      "_type": "Value"
    }
  },
  "description": "HandNet derived 96-row visualization preview. Deterministic stratified subset: 24 test original plus 24 matched perturbed, 16 validation original plus 16 matched derotated, 16 training derotated. Depth and IR are contrast-rendered preview PNGs; labels use a fixed palette. Source archives retain raw MATLAB arrays and all original data. Six sensors: thumb, index, middle, ring, little, palm. Camera coordinates are in millimetres, +X right, +Y down, +Z away.",
  "sourceManifest": "space-data/samples.json",
  "validation": "96 rows, Hugging Face schema metadata, Dataset.from_parquet round trip and first embedded image bytes verified."
}