class RFConvexHullPocketFinder(BindingPocketFinder):
"""Uses pre-trained RF model + ConvexHulPocketFinder to select pockets."""
def __init__(self, pad=5):
self.pad = pad
self.convex_finder = ConvexHullPocketFinder(pad)
# Load binding pocket model
self.base_dir = tempfile.mkdtemp()
print("About to download trained model.")
# TODO(rbharath): Shift refined to full once trained.
call(("wget -c http://deepchem.io.s3-website-us-west-1.amazonaws.com/trained_models/pocket_random_refined_RF.tar.gz").split())
call(("tar -zxvf pocket_random_refined_RF.tar.gz").split())
call(("mv pocket_random_refined_RF %s" % (self.base_dir)).split())
self.model_dir = os.path.join(self.base_dir, "pocket_random_refined_RF")
# Fit model on dataset
self.model = SklearnModel(model_dir=self.model_dir)
self.model.reload()
# Create featurizers
self.pocket_featurizer = BindingPocketFeaturizer()
self.ligand_featurizer = CircularFingerprint(size=1024)
def find_pockets(self, protein_file, ligand_file):
"""Compute features for a given complex
TODO(rbharath): This has a log of code overlap with
compute_binding_pocket_features in
examples/binding_pockets/binding_pocket_datasets.py. Find way to refactor
to avoid code duplication.
"""
if not ligand_file.endswith(".sdf"):
raise ValueError("Only .sdf ligand files can be featurized.")
ligand_basename = os.path.basename(ligand_file).split(".")[0]
ligand_mol2 = os.path.join(
self.base_dir, ligand_basename + ".mol2")
# Write mol2 file for ligand
obConversion = ob.OBConversion()
conv_out = obConversion.SetInAndOutFormats(str("sdf"), str("mol2"))
ob_mol = ob.OBMol()
obConversion.ReadFile(ob_mol, str(ligand_file))
obConversion.WriteFile(ob_mol, str(ligand_mol2))
# Featurize ligand
mol = Chem.MolFromMol2File(str(ligand_mol2), removeHs=False)
if mol is None:
return None, None
# Default for CircularFingerprint
n_ligand_features = 1024
ligand_features = self.ligand_featurizer.featurize([mol])
# Featurize pocket
pockets, pocket_atoms_map, pocket_coords = self.convex_finder.find_pockets(
protein_file, ligand_file)
n_pockets = len(pockets)
n_pocket_features = BindingPocketFeaturizer.n_features
features = np.zeros((n_pockets, n_pocket_features+n_ligand_features))
pocket_features = self.pocket_featurizer.featurize(
protein_file, pockets, pocket_atoms_map, pocket_coords)
# Note broadcast operation
features[:, :n_pocket_features] = pocket_features
features[:, n_pocket_features:] = ligand_features
dataset = NumpyDataset(X=features)
pocket_preds = self.model.predict(dataset)
pocket_pred_proba = np.squeeze(self.model.predict_proba(dataset))
# Find pockets which are active
active_pockets = []
active_pocket_atoms_map = {}
active_pocket_coords = []
for pocket_ind in range(len(pockets)):
#################################################### DEBUG
# TODO(rbharath): For now, using a weak cutoff. Fix later.
#if pocket_preds[pocket_ind] == 1:
if pocket_pred_proba[pocket_ind][1] > .15:
#################################################### DEBUG
pocket = pockets[pocket_ind]
active_pockets.append(pocket)
active_pocket_atoms_map[pocket] = pocket_atoms_map[pocket]
active_pocket_coords.append(pocket_coords[pocket_ind])
return active_pockets, active_pocket_atoms_map, active_pocket_coords
# Compute accuracies
task_scores = {
task: []
for task in range(len(test_dataset.get_task_names()))
}
for (task, support) in support_generator:
# Train model on support
sklearn_model = RandomForestClassifier(class_weight="balanced",
n_estimators=50)
model = SklearnModel(sklearn_model, model_dir)
model.fit(support)
# Test model
task_dataset = get_task_dataset_minus_support(test_dataset, support,
task)
y_pred = model.predict_proba(task_dataset)
score = metric.compute_metric(task_dataset.y, y_pred, task_dataset.w)
#print("Score on task %s is %s" % (str(task), str(score)))
task_scores[task].append(score)
# Join information for all tasks.
mean_task_scores = {}
for task in range(len(test_dataset.get_task_names())):
mean_task_scores[task] = np.mean(np.array(task_scores[task]))
print("Fold %s" % str(fold))
print(mean_task_scores)
for (fold_task, task) in zip(fold_tasks,
range(len(test_dataset.get_task_names()))):
all_scores[fold_task] = mean_task_scores[task]
class RFConvexHullPocketFinder(BindingPocketFinder):
"""Uses pre-trained RF model + ConvexHulPocketFinder to select pockets."""
def __init__(self, pad=5):
self.pad = pad
self.convex_finder = ConvexHullPocketFinder(pad)
# Load binding pocket model
self.base_dir = tempfile.mkdtemp()
print("About to download trained model.")
# TODO(rbharath): Shift refined to full once trained.
call((
"wget -c http://deepchem.io.s3-website-us-west-1.amazonaws.com/trained_models/pocket_random_refined_RF.tar.gz"
).split())
call(("tar -zxvf pocket_random_refined_RF.tar.gz").split())
call(("mv pocket_random_refined_RF %s" % (self.base_dir)).split())
self.model_dir = os.path.join(self.base_dir,
"pocket_random_refined_RF")
# Fit model on dataset
self.model = SklearnModel(model_dir=self.model_dir)
self.model.reload()
# Create featurizers
self.pocket_featurizer = BindingPocketFeaturizer()
self.ligand_featurizer = CircularFingerprint(size=1024)
def find_pockets(self, protein_file, ligand_file):
"""Compute features for a given complex
TODO(rbharath): This has a log of code overlap with
compute_binding_pocket_features in
examples/binding_pockets/binding_pocket_datasets.py. Find way to refactor
to avoid code duplication.
"""
if not ligand_file.endswith(".sdf"):
raise ValueError("Only .sdf ligand files can be featurized.")
ligand_basename = os.path.basename(ligand_file).split(".")[0]
ligand_mol2 = os.path.join(self.base_dir, ligand_basename + ".mol2")
# Write mol2 file for ligand
obConversion = ob.OBConversion()
conv_out = obConversion.SetInAndOutFormats(str("sdf"), str("mol2"))
ob_mol = ob.OBMol()
obConversion.ReadFile(ob_mol, str(ligand_file))
obConversion.WriteFile(ob_mol, str(ligand_mol2))
# Featurize ligand
mol = Chem.MolFromMol2File(str(ligand_mol2), removeHs=False)
if mol is None:
return None, None
# Default for CircularFingerprint
n_ligand_features = 1024
ligand_features = self.ligand_featurizer.featurize([mol])
# Featurize pocket
pockets, pocket_atoms_map, pocket_coords = self.convex_finder.find_pockets(
protein_file, ligand_file)
n_pockets = len(pockets)
n_pocket_features = BindingPocketFeaturizer.n_features
features = np.zeros((n_pockets, n_pocket_features + n_ligand_features))
pocket_features = self.pocket_featurizer.featurize(
protein_file, pockets, pocket_atoms_map, pocket_coords)
# Note broadcast operation
features[:, :n_pocket_features] = pocket_features
features[:, n_pocket_features:] = ligand_features
dataset = NumpyDataset(X=features)
pocket_preds = self.model.predict(dataset)
pocket_pred_proba = np.squeeze(self.model.predict_proba(dataset))
# Find pockets which are active
active_pockets = []
active_pocket_atoms_map = {}
active_pocket_coords = []
for pocket_ind in range(len(pockets)):
#################################################### DEBUG
# TODO(rbharath): For now, using a weak cutoff. Fix later.
#if pocket_preds[pocket_ind] == 1:
if pocket_pred_proba[pocket_ind][1] > .15:
#################################################### DEBUG
pocket = pockets[pocket_ind]
active_pockets.append(pocket)
active_pocket_atoms_map[pocket] = pocket_atoms_map[pocket]
active_pocket_coords.append(pocket_coords[pocket_ind])
return active_pockets, active_pocket_atoms_map, active_pocket_coords
support_generator = SupportGenerator(
test_dataset, range(len(test_dataset.get_task_names())), n_pos, n_neg,
n_trials, replace)
# Compute accuracies
task_scores = {task: [] for task in range(len(test_dataset.get_task_names()))}
for (task, support) in support_generator:
# Train model on support
sklearn_model = RandomForestClassifier(
class_weight="balanced", n_estimators=50)
model = SklearnModel(sklearn_model, model_dir)
model.fit(support)
# Test model
task_dataset = get_task_dataset_minus_support(test_dataset, support, task)
y_pred = model.predict_proba(task_dataset)
score = metric.compute_metric(
task_dataset.y, y_pred, task_dataset.w)
#print("Score on task %s is %s" % (str(task), str(score)))
task_scores[task].append(score)
# Join information for all tasks.
mean_task_scores = {}
for task in range(len(test_dataset.get_task_names())):
mean_task_scores[task] = np.mean(np.array(task_scores[task]))
print("Fold %s" % str(fold))
print(mean_task_scores)
for (fold_task, task) in zip(fold_tasks, range(len(test_dataset.get_task_names()))):
all_scores[fold_task] = mean_task_scores[task]
