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[ 6, 1, 1, 1, 1 ]
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[ 7, 1, 1, 1 ]
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[ 6, 6, 1, 1 ]
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[ 6, 8, 1, 1 ]
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[ 6, 6, 1, 1, 1, 1, 1, 1 ]
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[ 6, 8, 1, 1, 1, 1 ]
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[ 6, 6, 7, 1, 1, 1 ]
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[ 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1 ]
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[ 6, 8, 6, 1, 1, 1, 1, 1, 1 ]
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[ 6, 6, 6, 1, 1, 1, 1, 1, 1 ]
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[ 6, 6, 8, 1, 1, 1, 1 ]
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{ "qm9_index": 17, "mol_id": "gdb_17", "sdf_name": "gdb_17", "atom_symbols": [ "C", "C", "O", "H", "H", "H", "H" ], "bond_indices": [ [ 0, 1 ], [ 0, 2 ], [ 0, 3 ], [ 0, 4 ], [ 1, 2 ...
[ 6, 6, 6, 8, 1, 1, 1, 1, 1, 1 ]
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{ "qm9_index": 18, "mol_id": "gdb_18", "sdf_name": "gdb_18", "atom_symbols": [ "C", "C", "C", "O", "H", "H", "H", "H", "H", "H" ], "bond_indices": [ [ 0, 1 ], [ 0, 4 ], [ 0, 5 ], [ 0, 6 ],...
[ 6, 6, 7, 8, 1, 1, 1, 1, 1 ]
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{ "qm9_index": 19, "mol_id": "gdb_19", "sdf_name": "gdb_19", "atom_symbols": [ "C", "C", "N", "O", "H", "H", "H", "H", "H" ], "bond_indices": [ [ 0, 1 ], [ 0, 4 ], [ 0, 5 ], [ 0, 6 ], [ ...
[ 7, 6, 7, 8, 1, 1, 1, 1 ]
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{ "qm9_index": 20, "mol_id": "gdb_20", "sdf_name": "gdb_20", "atom_symbols": [ "N", "C", "N", "O", "H", "H", "H", "H" ], "bond_indices": [ [ 0, 1 ], [ 0, 4 ], [ 0, 5 ], [ 1, 2 ], [ 1, ...
[ 6, 6, 6, 6, 1, 1 ]
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{ "qm9_index": 23, "mol_id": "gdb_23", "sdf_name": "gdb_23", "atom_symbols": [ "C", "C", "C", "C", "H", "H" ], "bond_indices": [ [ 0, 1 ], [ 0, 3 ], [ 1, 2 ], [ 2, 4 ], [ 3, 5 ] ], ...
[ 6, 6, 6, 1, 7 ]
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{ "qm9_index": 24, "mol_id": "gdb_24", "sdf_name": "gdb_24", "atom_symbols": [ "C", "C", "C", "H", "N" ], "bond_indices": [ [ 0, 1 ], [ 0, 2 ], [ 1, 4 ], [ 2, 3 ] ], "bond_orders": [ 3, 1, 1, ...
[ 7, 6, 6, 7 ]
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[ 8, 6, 6, 6, 1, 1 ]
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[ 8, 6, 6, 7, 1 ]
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{ "qm9_index": 27, "mol_id": "gdb_27", "sdf_name": "gdb_27", "atom_symbols": [ "O", "C", "C", "N", "H" ], "bond_indices": [ [ 0, 1 ], [ 1, 2 ], [ 1, 4 ], [ 2, 3 ] ], "bond_orders": [ 2, 1, 1, ...
[ 6, 6, 6, 6, 1, 1, 1, 1, 1, 1 ]
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[ 6, 6, 6, 6, 1, 1, 1, 1, 1, 1 ]
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[ 7, 6, 6, 7, 1, 1, 1, 1 ]
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[ 8, 6, 6, 6, 1, 1, 1, 1 ]
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[ 8, 6, 6, 7, 1, 1, 1 ]
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[ 6, 6, 6, 8, 1, 1, 1, 1, 1, 1 ]
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[ 8, 6, 6, 8, 1, 1, 1, 1 ]
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[ 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
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[ 6, 6, 6, 8, 1, 1, 1, 1, 1, 1, 1, 1 ]
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[ 6, 8, 6, 6, 8, 1, 1, 1, 1, 1, 1 ]
[ [ 1.720703125, 0.15771484375, -0.00018334388732910156 ], [ 0.403564453125, 0.65771484375, -0.0006380081176757812 ], [ -0.5712890625, -0.3505859375, 0.000255584716796875 ], [ -1.9384765625, 0.311767578125, -0.0001556873321533203 ], [ -2.974609375, ...
{ "qm9_index": 131, "mol_id": "gdb_131", "sdf_name": "gdb_131", "atom_symbols": [ "C", "O", "C", "C", "O", "H", "H", "H", "H", "H", "H" ], "bond_indices": [ [ 0, 1 ], [ 0, 5 ], [ 0, 6 ], [ 0, ...
[ 8, 6, 6, 6, 8, 1, 1, 1, 1, 1, 1 ]
[ [ -2.09765625, 0.09429931640625, -0.290283203125 ], [ -0.81884765625, 0.50048828125, 0.1541748046875 ], [ 0.285888671875, -0.497802734375, -0.2413330078125 ], [ 1.6650390625, 0.0537109375, 0.033782958984375 ], [ 2.453125, -0.416015625, 0.81...
{ "qm9_index": 132, "mol_id": "gdb_132", "sdf_name": "gdb_132", "atom_symbols": [ "O", "C", "C", "C", "O", "H", "H", "H", "H", "H", "H" ], "bond_indices": [ [ 0, 1 ], [ 0, 5 ], [ 1, 2 ], [ 1, ...
[ 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
[ [ 2.556640625, 0.2998046875, -0.00006127357482910156 ], [ 1.2822265625, -0.5478515625, 0.0001074075698852539 ], [ -0.000023424625396728516, 0.291015625, -0.00001341104507446289 ], [ -1.2822265625, -0.5478515625, -0.00010687112808227539 ], [ -2.5566...
{ "qm9_index": 133, "mol_id": "gdb_133", "sdf_name": "gdb_133", "atom_symbols": [ "C", "C", "C", "C", "C", "H", "H", "H", "H", "H", "H", "H", "H", "H", "H", "H", "H" ], "bond_indices": [ [ 4, 14 ], [ 4, 1...
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QM9 (characterized molecules)

This dataset contains the 130,831 characterized molecules in QM9. The release has 133,885 molecules; the canonical 3,054 uncharacterized entries are listed in uncharacterized.txt and excluded here.

Each row has three columns:

  • atoms: atomic numbers (list<uint8>)
  • coords: centered/PCA-aligned Cartesian coordinates (list<list<float16>>)
  • metadata: a typed nested struct with identifiers, atom symbols, bond indices, bond orders, canonical SMILES, atom/bond counts, RDKit validity, and all 19 QM9 scalar properties

The splits use the EDM convention from Hoogeboom et al.: NumPy seed 0, with 100,000 training, 17,748 validation, and 13,083 test molecules. QM9 itself does not define a canonical split.

Load

from datasets import load_dataset

data = load_dataset("LMucko/qm9")
data["train"][0]
data["validation"][0]
data["test"][0]

Rebuild

uv run build_qm9_metadata_parquet.py

The script downloads the canonical QM9 archive into data/qm9_source/ and writes data/train.parquet, data/validation.parquet, and data/test.parquet.

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