def smiles2graph(smiles_string):
"""
Converts SMILES string to graph Data object
:input: SMILES string (str)
:return: graph object
"""
mol = Chem.MolFromSmiles(smiles_string)
mol = Chem.AddHs(mol)
# atoms
atom_features_list = []
for atom in mol.GetAtoms():
atom_features_list.append(atom_to_feature_vector(atom))
x = np.array(atom_features_list, dtype=np.int64)
# bonds
num_bond_features = 3 # bond type, bond stereo, is_conjugated
if len(mol.GetBonds()) > 0: # mol has bonds
edges_list = []
edge_features_list = []
for bond in mol.GetBonds():
i = bond.GetBeginAtomIdx()
j = bond.GetEndAtomIdx()
edge_feature = bond_to_feature_vector(bond)
# add edges in both directions
edges_list.append((i, j))
edge_features_list.append(edge_feature)
edges_list.append((j, i))
edge_features_list.append(edge_feature)
# data.edge_index: Graph connectivity in COO format with shape [2, num_edges]
edge_index = np.array(edges_list, dtype=np.int64).T
# data.edge_attr: Edge feature matrix with shape [num_edges, num_edge_features]
edge_attr = np.array(edge_features_list, dtype=np.int64)
else: # mol has no bonds
edge_index = np.empty((2, 0), dtype=np.int64)
edge_attr = np.empty((0, num_bond_features), dtype=np.int64)
graph = dict()
graph['edge_index'] = edge_index
graph['edge_feat'] = edge_attr
graph['node_feat'] = x
graph['num_nodes'] = len(x)
return graph
def process(self):
print('processing data from ({}) and saving it to ({})'.format(
self.directory, os.path.join(self.directory, 'processed')))
with open(os.path.join(self.directory, "summary_qm9.json"), "r") as f:
summary = json.load(f)
atom_slices = [0]
edge_slices = [0]
total_eigvecs = []
total_eigvals = []
all_atom_features = []
all_edge_features = []
targets = {
'ensembleenergy': [],
'ensembleentropy': [],
'ensemblefreeenergy': [],
'lowestenergy': [],
'poplowestpct': [],
'temperature': [],
'uniqueconfs': []
}
edge_indices = [] # edges of each molecule in coo format
atomic_number_long = []
n_atoms_list = []
coordinates = []
smiles_list = []
total_atoms = 0
total_edges = 0
avg_degree = 0 # average degree in the dataset
for smiles, sub_dic in tqdm(list(summary.items())):
pickle_path = os.path.join(self.directory,
sub_dic.get("pickle_path", ""))
if os.path.isfile(pickle_path):
pickle_file = open(pickle_path, 'rb')
mol_dict = pickle.load(pickle_file)
if 'ensembleenergy' in mol_dict:
conformers = mol_dict['conformers']
mol = conformers[0]['rd_mol']
n_atoms = len(mol.GetAtoms())
atom_features_list = []
for atom in mol.GetAtoms():
atom_features_list.append(atom_to_feature_vector(atom))
all_atom_features.append(
torch.tensor(atom_features_list, dtype=torch.long))
adj = GetAdjacencyMatrix(mol, useBO=False, force=True)
max_freqs = 10
adj = torch.tensor(adj).float()
D = torch.diag(adj.sum(dim=0))
L = D - adj
N = adj.sum(dim=0)**-0.5
L_sym = torch.eye(n_atoms) - N * L * N
try:
eig_vals, eig_vecs = torch.symeig(L_sym,
eigenvectors=True)
except Exception as e: # if we have disconnected components
deg = adj.sum(dim=0)
deg[deg == 0] = 1
N = deg**-0.5
L_sym = torch.eye(n_atoms) - N * L * N
eig_vals, eig_vecs = torch.symeig(L_sym,
eigenvectors=True)
idx = eig_vals.argsort(
)[0:
max_freqs] # Keep up to the maximum desired number of frequencies
eig_vals, eig_vecs = eig_vals[idx], eig_vecs[:, idx]
# Sort, normalize and pad EigenVectors
eig_vecs = eig_vecs[:,
eig_vals.argsort()] # increasing order
eig_vecs = F.normalize(eig_vecs,
p=2,
dim=1,
eps=1e-12,
out=None)
if n_atoms < max_freqs:
eig_vecs = F.pad(eig_vecs, (0, max_freqs - n_atoms),
value=float('nan'))
eig_vals = F.pad(eig_vals, (0, max_freqs - n_atoms),
value=float('nan'))
total_eigvecs.append(eig_vecs)
total_eigvals.append(eig_vals.unsqueeze(0))
edges_list = []
edge_features_list = []
for bond in mol.GetBonds():
i = bond.GetBeginAtomIdx()
j = bond.GetEndAtomIdx()
edge_feature = bond_to_feature_vector(bond)
# add edges in both directions
edges_list.append((i, j))
edge_features_list.append(edge_feature)
edges_list.append((j, i))
edge_features_list.append(edge_feature)
# Graph connectivity in COO format with shape [2, num_edges]
edge_index = torch.tensor(edges_list, dtype=torch.long).T
edge_features = torch.tensor(edge_features_list,
dtype=torch.long)
avg_degree += (len(edges_list) / 2) / n_atoms
targets['ensembleenergy'].append(
mol_dict['ensembleenergy'])
targets['ensembleentropy'].append(
mol_dict['ensembleentropy'])
targets['ensemblefreeenergy'].append(
mol_dict['ensemblefreeenergy'])
targets['lowestenergy'].append(mol_dict['lowestenergy'])
targets['poplowestpct'].append(mol_dict['poplowestpct'])
targets['temperature'].append(mol_dict['temperature'])
targets['uniqueconfs'].append(mol_dict['uniqueconfs'])
conformers = [
torch.tensor(
conformer['rd_mol'].GetConformer().GetPositions(),
dtype=torch.float) for conformer in conformers[:10]
]
if len(
conformers
) < 10: # if there are less than 10 conformers we add the first one a few times
conformers.extend([conformers[0]] *
(10 - len(conformers)))
all_edge_features.append(edge_features)
coordinates.append(torch.cat(conformers, dim=1))
edge_indices.append(edge_index)
total_edges += len(edges_list)
total_atoms += n_atoms
smiles_list.append(smiles)
edge_slices.append(total_edges)
atom_slices.append(total_atoms)
n_atoms_list.append(n_atoms)
for key, value in targets.items():
targets[key] = torch.tensor(value)[:, None]
data_dict = {
'smiles':
smiles_list,
'n_atoms':
torch.tensor(n_atoms_list, dtype=torch.long),
'atom_slices':
torch.tensor(atom_slices, dtype=torch.long),
'edge_slices':
torch.tensor(edge_slices, dtype=torch.long),
'atom_features':
torch.cat(all_atom_features, dim=0),
'edge_features':
torch.cat(all_edge_features, dim=0),
'atomic_number_long':
torch.tensor(atomic_number_long, dtype=torch.long),
'edge_indices':
torch.cat(edge_indices, dim=1),
'coordinates':
torch.cat(coordinates, dim=0).float(),
'targets':
targets,
'avg_degree':
avg_degree / len(n_atoms_list)
}
data_dict.update(targets)
if not os.path.exists(os.path.join(self.directory, 'processed')):
os.mkdir(os.path.join(self.directory, 'processed'))
torch.save(
data_dict,
os.path.join(self.directory, 'processed', self.processed_file))
def process(self):
print('processing data from ({}) and saving it to ({})'.format(self.qm9_directory,
os.path.join(self.qm9_directory, 'processed')))
# load qm9 data with spatial coordinates
data_qm9 = dict(np.load(os.path.join(self.qm9_directory, self.raw_spatial_data), allow_pickle=True))
coordinates = torch.tensor(data_qm9['R'], dtype=torch.float)
# Read the QM9 data with SMILES information
molecules_df = pd.read_csv(os.path.join(self.qm9_directory, self.raw_qm9_file))
atom_slices = [0]
edge_slices = [0]
total_eigvecs = []
total_eigvals = []
all_atom_features = []
all_edge_features = []
edge_indices = [] # edges of each molecule in coo format
targets = [] # the 19 properties that should be predicted for the QM9 dataset
total_atoms = 0
total_edges = 0
avg_degree = 0 # average degree in the dataset
# go through all molecules in the npz file
for mol_idx, n_atoms in tqdm(enumerate(data_qm9['N'])):
# get the molecule using the smiles representation from the csv file
mol = Chem.MolFromSmiles(molecules_df['smiles'][data_qm9['id'][mol_idx]])
# add hydrogen bonds to molecule because they are not in the smiles representation
mol = Chem.AddHs(mol)
atom_features_list = []
for atom in mol.GetAtoms():
atom_features_list.append(atom_to_feature_vector(atom))
all_atom_features.append(torch.tensor(atom_features_list, dtype=torch.long))
adj = GetAdjacencyMatrix(mol, useBO=False, force=True)
max_freqs = 10
adj = torch.tensor(adj).float()
D = torch.diag(adj.sum(dim=0))
L = D - adj
N = adj.sum(dim=0) ** -0.5
L_sym = torch.eye(n_atoms) - N * L * N
eig_vals, eig_vecs = torch.symeig(L_sym, eigenvectors=True)
idx = eig_vals.argsort()[0: max_freqs] # Keep up to the maximum desired number of frequencies
eig_vals, eig_vecs = eig_vals[idx], eig_vecs[:, idx]
# Sort, normalize and pad EigenVectors
eig_vecs = eig_vecs[:, eig_vals.argsort()] # increasing order
eig_vecs = F.normalize(eig_vecs, p=2, dim=1, eps=1e-12, out=None)
if n_atoms < max_freqs:
eig_vecs = F.pad(eig_vecs, (0, max_freqs - n_atoms), value=float('nan'))
eig_vals = F.pad(eig_vals, (0, max_freqs - n_atoms), value=float('nan'))
total_eigvecs.append(eig_vecs)
total_eigvals.append(eig_vals.unsqueeze(0))
edges_list = []
edge_features_list = []
for bond in mol.GetBonds():
i = bond.GetBeginAtomIdx()
j = bond.GetEndAtomIdx()
edge_feature = bond_to_feature_vector(bond)
# add edges in both directions
edges_list.append((i, j))
edge_features_list.append(edge_feature)
edges_list.append((j, i))
edge_features_list.append(edge_feature)
# Graph connectivity in COO format with shape [2, num_edges]
edge_index = torch.tensor(edges_list, dtype=torch.long).T
edge_features = torch.tensor(edge_features_list, dtype=torch.long)
avg_degree += (len(edges_list) / 2) / n_atoms
# get all 19 attributes that should be predicted, so we drop the first two entries (name and smiles)
target = torch.tensor(molecules_df.iloc[data_qm9['id'][mol_idx]][2:], dtype=torch.float)
targets.append(target)
edge_indices.append(edge_index)
all_edge_features.append(edge_features)
total_edges += len(edges_list)
total_atoms += n_atoms
edge_slices.append(total_edges)
atom_slices.append(total_atoms)
# convert targets to eV units
targets = torch.stack(targets) * torch.tensor(list(self.unit_conversion.values()))[None, :]
data_dict = {'mol_id': data_qm9['id'],
'n_atoms': torch.tensor(data_qm9['N'], dtype=torch.long),
'atom_slices': torch.tensor(atom_slices, dtype=torch.long),
'edge_slices': torch.tensor(edge_slices, dtype=torch.long),
'eig_vecs': torch.cat(total_eigvecs).float(),
'eig_vals': torch.cat(total_eigvals).float(),
'edge_indices': torch.cat(edge_indices, dim=1),
'atom_features': torch.cat(all_atom_features, dim=0),
'edge_features': torch.cat(all_edge_features, dim=0),
'atomic_number_long': torch.tensor(data_qm9['Z'], dtype=torch.long)[:, None],
'coordinates': coordinates,
'targets': targets,
'avg_degree': avg_degree / len(data_qm9['id'])
}
if not os.path.exists(os.path.join(self.qm9_directory, 'processed')):
os.mkdir(os.path.join(self.qm9_directory, 'processed'))
torch.save(data_dict, os.path.join(self.qm9_directory, 'processed', self.processed_file))