{
  "split_policy": "Source-provided patch split from polarization_v2 healthy_bone_cell folders. Each source folder contains train, val, and test subfolders.",
  "leakage_note": "healthy_bone_cell splits follow the existing source-folder patch split. Multiple patches from the same source_id can appear across train, validation, and test, so users who need specimen-level isolation should rebuild splits from metadata/healthy_bone_cell_manifest.jsonl.",
  "splits": {
    "train": {
      "subset": "healthy_bone_cell",
      "specimen_type": "healthy_bone_cell",
      "samples": 6006,
      "source_dirs": 53,
      "shards": 94,
      "path_pattern": "data/train-*.parquet"
    },
    "validation": {
      "subset": "healthy_bone_cell",
      "specimen_type": "healthy_bone_cell",
      "samples": 713,
      "source_dirs": 53,
      "shards": 12,
      "path_pattern": "data/validation-*.parquet"
    },
    "test": {
      "subset": "healthy_bone_cell",
      "specimen_type": "healthy_bone_cell",
      "samples": 643,
      "source_dirs": 53,
      "shards": 11,
      "path_pattern": "data/test-*.parquet"
    },
    "external_waveplate": {
      "subset": "waveplate",
      "specimen_type": "waveplate",
      "samples": 18,
      "wavelength_nm": 633,
      "path_pattern": "data/external_waveplate-*.parquet"
    },
    "external_spectral_610": {
      "subset": "spectral",
      "specimen_type": "spectral",
      "samples": 165,
      "wavelength_nm": 610,
      "path_pattern": "data/external_spectral_610-*.parquet"
    },
    "external_spectral_650": {
      "subset": "spectral",
      "specimen_type": "spectral",
      "samples": 165,
      "wavelength_nm": 650,
      "path_pattern": "data/external_spectral_650-*.parquet"
    },
    "external_spectral_690": {
      "subset": "spectral",
      "specimen_type": "spectral",
      "samples": 165,
      "wavelength_nm": 690,
      "path_pattern": "data/external_spectral_690-*.parquet"
    }
  }
}