def chemprop_train() -> None:
"""Runs chemprop training."""
args = TrainArgs().parse_args()
logger = create_logger(name='train',
save_dir=args.save_dir,
quiet=args.quiet)
cross_validate(args, logger)
def setUp(self):
parser = ArgumentParser()
add_train_args(parser)
args = parser.parse_args([])
args.data_path = os.path.join(
os.path.dirname(os.path.abspath(__file__)), 'delaney_toy.csv')
args.dataset_type = 'regression'
args.batch_size = 2
args.hidden_size = 5
args.epochs = 1
args.quiet = True
self.temp_dir = TemporaryDirectory()
args.save_dir = self.temp_dir.name
logger = create_logger(name='train',
save_dir=args.save_dir,
quiet=args.quiet)
modify_train_args(args)
cross_validate(args, logger)
clear_cache()
parser = ArgumentParser()
add_predict_args(parser)
args = parser.parse_args([])
args.batch_size = 2
args.checkpoint_dir = self.temp_dir.name
args.preds_path = NamedTemporaryFile().name
args.test_path = os.path.join(
os.path.dirname(os.path.abspath(__file__)),
'delaney_toy_smiles.csv')
self.args = args
def sklearn_train() -> None:
"""Runs sklearn training."""
args = SklearnTrainArgs().parse_args()
logger = create_logger(name='sklearn-train',
save_dir=args.save_dir,
quiet=args.quiet)
cross_validate_sklearn(args, logger)
def main():
'''main method.'''
args = parse_train_args()
logger = create_logger(name='train',
save_dir=args.save_dir,
quiet=args.quiet)
cross_validate(args, logger)
def sklearn_train() -> None:
"""Parses scikit-learn training arguments and trains a scikit-learn model.
This is the entry point for the command line command :code:`sklearn_train`.
"""
args = SklearnTrainArgs().parse_args()
logger = create_logger(name='sklearn-train',
save_dir=args.save_dir,
quiet=args.quiet)
cross_validate_sklearn(args, logger)
def chemprop_train() -> None:
"""Parses Chemprop training arguments and trains (cross-validates) a Chemprop model.
This is the entry point for the command line command :code:`chemprop_train`.
"""
args = TrainArgs().parse_args()
logger = create_logger(name='train',
save_dir=args.save_dir,
quiet=args.quiet)
cross_validate(args, logger)
def train_outside(args_dict):
"""
Used for calling this script from another python script.
:dict args_dict: dict of args to use
"""
sys.argv = create_args(args_dict, 'train.py')
args = TrainArgs().parse_args()
logger = create_logger(name='train', save_dir=args.save_dir, quiet=args.quiet)
cross_validate(args, logger)
def setUp(self):
parser = ArgumentParser()
add_train_args(parser)
args = parser.parse_args([])
args.data_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'delaney_toy.csv')
args.dataset_type = 'regression'
args.batch_size = 2
args.hidden_size = 5
args.epochs = 1
args.quiet = True
self.args = args
logger = create_logger(name='train', save_dir=args.save_dir, quiet=args.quiet)
self.logger = logger
def cross_validate_sklearn(args: SklearnTrainArgs) -> Tuple[float, float]:
"""
Runs k-fold cross-validation for a scikit-learn model.
For each of k splits (folds) of the data, trains and tests a model on that split
and aggregates the performance across folds.
:param args: A :class:`~chemprop.args.SklearnTrainArgs` object containing arguments for
loading data and training the scikit-learn model.
:return: A tuple containing the mean and standard deviation performance across folds.
"""
logger = create_logger(name=SKLEARN_TRAIN_LOGGER_NAME,
save_dir=args.save_dir,
quiet=args.quiet)
info = logger.info if logger is not None else print
init_seed = args.seed
save_dir = args.save_dir
# Run training on different random seeds for each fold
all_scores = []
for fold_num in range(args.num_folds):
info(f'Fold {fold_num}')
args.seed = init_seed + fold_num
args.save_dir = os.path.join(save_dir, f'fold_{fold_num}')
makedirs(args.save_dir)
model_scores = run_sklearn(args, logger)
all_scores.append(model_scores)
all_scores = np.array(all_scores)
# Report scores for each fold
for fold_num, scores in enumerate(all_scores):
info(
f'Seed {init_seed + fold_num} ==> test {args.metric} = {np.nanmean(scores):.6f}'
)
# Report scores across folds
avg_scores = np.nanmean(
all_scores, axis=1) # average score for each model across tasks
mean_score, std_score = np.nanmean(avg_scores), np.nanstd(avg_scores)
info(f'Overall test {args.metric} = {mean_score:.6f} +/- {std_score:.6f}')
return mean_score, std_score
def train():
"""Renders the train page and performs training if request method is POST."""
global PROGRESS, TRAINING
warnings, errors = [], []
if request.method == 'GET':
return render_train()
# Get arguments
data_name, epochs, ensemble_size, checkpoint_name = \
request.form['dataName'], int(request.form['epochs']), \
int(request.form['ensembleSize']), request.form['checkpointName']
gpu = request.form.get('gpu')
data_path = os.path.join(app.config['DATA_FOLDER'], f'{data_name}.csv')
dataset_type = request.form.get('datasetType', 'regression')
# Create and modify args
args = TrainArgs().parse_args([
'--data_path', data_path, '--dataset_type', dataset_type, '--epochs',
str(epochs), '--ensemble_size',
str(ensemble_size)
])
# Check if regression/classification selection matches data
data = get_data(path=data_path)
targets = data.targets()
unique_targets = {
target
for row in targets for target in row if target is not None
}
if dataset_type == 'classification' and len(unique_targets - {0, 1}) > 0:
errors.append(
'Selected classification dataset but not all labels are 0 or 1. Select regression instead.'
)
return render_train(warnings=warnings, errors=errors)
if dataset_type == 'regression' and unique_targets <= {0, 1}:
errors.append(
'Selected regression dataset but all labels are 0 or 1. Select classification instead.'
)
return render_train(warnings=warnings, errors=errors)
if gpu is not None:
if gpu == 'None':
args.cuda = False
else:
args.gpu = int(gpu)
current_user = request.cookies.get('currentUser')
if not current_user:
# Use DEFAULT as current user if the client's cookie is not set.
current_user = app.config['DEFAULT_USER_ID']
ckpt_id, ckpt_name = db.insert_ckpt(checkpoint_name, current_user,
args.dataset_type, args.epochs,
args.ensemble_size, len(targets))
with TemporaryDirectory() as temp_dir:
args.save_dir = temp_dir
process = mp.Process(target=progress_bar, args=(args, PROGRESS))
process.start()
TRAINING = 1
# Run training
logger = create_logger(name='train',
save_dir=args.save_dir,
quiet=args.quiet)
task_scores = run_training(args, logger)
process.join()
# Reset globals
TRAINING = 0
PROGRESS = mp.Value('d', 0.0)
# Check if name overlap
if checkpoint_name != ckpt_name:
warnings.append(
name_already_exists_message('Checkpoint', checkpoint_name,
ckpt_name))
# Move models
for root, _, files in os.walk(args.save_dir):
for fname in files:
if fname.endswith('.pt'):
model_id = db.insert_model(ckpt_id)
save_path = os.path.join(app.config['CHECKPOINT_FOLDER'],
f'{model_id}.pt')
shutil.move(os.path.join(args.save_dir, root, fname),
save_path)
return render_train(trained=True,
metric=args.metric,
num_tasks=len(args.task_names),
task_names=args.task_names,
task_scores=format_float_list(task_scores),
mean_score=format_float(np.mean(task_scores)),
warnings=warnings,
errors=errors)
def cross_validate(args: TrainArgs) -> Tuple[float, float]:
"""
Runs k-fold cross-validation for a Chemprop model.
For each of k splits (folds) of the data, trains and tests a model on that split
and aggregates the performance across folds.
:param args: A :class:`~chemprop.args.TrainArgs` object containing arguments for
loading data and training the Chemprop model.
:return: A tuple containing the mean and standard deviation performance across folds.
"""
logger = create_logger(name=TRAIN_LOGGER_NAME,
save_dir=args.save_dir,
quiet=args.quiet)
info = logger.info if logger is not None else print
# Initialize relevant variables
init_seed = args.seed
save_dir = args.save_dir
args.task_names = get_task_names(path=args.data_path,
smiles_column=args.smiles_column,
target_columns=args.target_columns,
ignore_columns=args.ignore_columns)
# Run training on different random seeds for each fold
all_scores = []
for fold_num in range(args.num_folds):
info(f'Fold {fold_num}')
args.seed = init_seed + fold_num
args.save_dir = os.path.join(save_dir, f'fold_{fold_num}')
makedirs(args.save_dir)
model_scores = run_training(args, logger)
all_scores.append(model_scores)
all_scores = np.array(all_scores)
# Report results
info(f'{args.num_folds}-fold cross validation')
# Report scores for each fold
for fold_num, scores in enumerate(all_scores):
info(
f'\tSeed {init_seed + fold_num} ==> test {args.metric} = {np.nanmean(scores):.6f}'
)
if args.show_individual_scores:
for task_name, score in zip(args.task_names, scores):
info(
f'\t\tSeed {init_seed + fold_num} ==> test {task_name} {args.metric} = {score:.6f}'
)
# Report scores across models
avg_scores = np.nanmean(
all_scores, axis=1) # average score for each model across tasks
mean_score, std_score = np.nanmean(avg_scores), np.nanstd(avg_scores)
info(f'Overall test {args.metric} = {mean_score:.6f} +/- {std_score:.6f}')
if args.show_individual_scores:
for task_num, task_name in enumerate(args.task_names):
info(
f'\tOverall test {task_name} {args.metric} = '
f'{np.nanmean(all_scores[:, task_num]):.6f} +/- {np.nanstd(all_scores[:, task_num]):.6f}'
)
# Save scores
with open(os.path.join(save_dir, TEST_SCORES_FILE_NAME), 'w') as f:
writer = csv.writer(f)
writer.writerow([
'Task', f'Mean {args.metric}', f'Standard deviation {args.metric}'
] + [f'Fold {i} {args.metric}' for i in range(args.num_folds)])
for task_num, task_name in enumerate(args.task_names):
task_scores = all_scores[:, task_num]
mean, std = np.nanmean(task_scores), np.nanstd(task_scores)
writer.writerow([task_name, mean, std] + task_scores.tolist())
return mean_score, std_score
def cross_validate(args: TrainArgs,
train_func: Callable[[TrainArgs, MoleculeDataset, Logger], Dict[str, List[float]]]
) -> Tuple[float, float]:
"""
Runs k-fold cross-validation.
For each of k splits (folds) of the data, trains and tests a model on that split
and aggregates the performance across folds.
:param args: A :class:`~chemprop.args.TrainArgs` object containing arguments for
loading data and training the Chemprop model.
:param train_func: Function which runs training.
:return: A tuple containing the mean and standard deviation performance across folds.
"""
logger = create_logger(name=TRAIN_LOGGER_NAME, save_dir=args.save_dir, quiet=args.quiet)
if logger is not None:
debug, info = logger.debug, logger.info
else:
debug = info = print
# Initialize relevant variables
init_seed = args.seed
save_dir = args.save_dir
args.task_names = get_task_names(path=args.data_path, smiles_columns=args.smiles_columns,
target_columns=args.target_columns, ignore_columns=args.ignore_columns)
# Print command line
debug('Command line')
debug(f'python {" ".join(sys.argv)}')
# Print args
debug('Args')
debug(args)
# Save args
makedirs(args.save_dir)
try:
args.save(os.path.join(args.save_dir, 'args.json'))
except subprocess.CalledProcessError:
debug('Could not write the reproducibility section of the arguments to file, thus omitting this section.')
args.save(os.path.join(args.save_dir, 'args.json'), with_reproducibility=False)
# set explicit H option and reaction option
reset_featurization_parameters(logger=logger)
set_explicit_h(args.explicit_h)
set_adding_hs(args.adding_h)
if args.reaction:
set_reaction(args.reaction, args.reaction_mode)
elif args.reaction_solvent:
set_reaction(True, args.reaction_mode)
# Get data
debug('Loading data')
data = get_data(
path=args.data_path,
args=args,
logger=logger,
skip_none_targets=True,
data_weights_path=args.data_weights_path
)
validate_dataset_type(data, dataset_type=args.dataset_type)
args.features_size = data.features_size()
if args.atom_descriptors == 'descriptor':
args.atom_descriptors_size = data.atom_descriptors_size()
args.ffn_hidden_size += args.atom_descriptors_size
elif args.atom_descriptors == 'feature':
args.atom_features_size = data.atom_features_size()
set_extra_atom_fdim(args.atom_features_size)
if args.bond_features_path is not None:
args.bond_features_size = data.bond_features_size()
set_extra_bond_fdim(args.bond_features_size)
debug(f'Number of tasks = {args.num_tasks}')
if args.target_weights is not None and len(args.target_weights) != args.num_tasks:
raise ValueError('The number of provided target weights must match the number and order of the prediction tasks')
# Run training on different random seeds for each fold
all_scores = defaultdict(list)
for fold_num in range(args.num_folds):
info(f'Fold {fold_num}')
args.seed = init_seed + fold_num
args.save_dir = os.path.join(save_dir, f'fold_{fold_num}')
makedirs(args.save_dir)
data.reset_features_and_targets()
# If resuming experiment, load results from trained models
test_scores_path = os.path.join(args.save_dir, 'test_scores.json')
if args.resume_experiment and os.path.exists(test_scores_path):
print('Loading scores')
with open(test_scores_path) as f:
model_scores = json.load(f)
# Otherwise, train the models
else:
model_scores = train_func(args, data, logger)
for metric, scores in model_scores.items():
all_scores[metric].append(scores)
all_scores = dict(all_scores)
# Convert scores to numpy arrays
for metric, scores in all_scores.items():
all_scores[metric] = np.array(scores)
# Report results
info(f'{args.num_folds}-fold cross validation')
# Report scores for each fold
contains_nan_scores = False
for fold_num in range(args.num_folds):
for metric, scores in all_scores.items():
info(f'\tSeed {init_seed + fold_num} ==> test {metric} = {multitask_mean(scores[fold_num], metric):.6f}')
if args.show_individual_scores:
for task_name, score in zip(args.task_names, scores[fold_num]):
info(f'\t\tSeed {init_seed + fold_num} ==> test {task_name} {metric} = {score:.6f}')
if np.isnan(score):
contains_nan_scores = True
# Report scores across folds
for metric, scores in all_scores.items():
avg_scores = multitask_mean(scores, axis=1, metric=metric) # average score for each model across tasks
mean_score, std_score = np.mean(avg_scores), np.std(avg_scores)
info(f'Overall test {metric} = {mean_score:.6f} +/- {std_score:.6f}')
if args.show_individual_scores:
for task_num, task_name in enumerate(args.task_names):
info(f'\tOverall test {task_name} {metric} = '
f'{np.mean(scores[:, task_num]):.6f} +/- {np.std(scores[:, task_num]):.6f}')
if contains_nan_scores:
info("The metric scores observed for some fold test splits contain 'nan' values. \
This can occur when the test set does not meet the requirements \
for a particular metric, such as having no valid instances of one \
task in the test set or not having positive examples for some classification metrics. \
Before v1.5.1, the default behavior was to ignore nan values in individual folds or tasks \
and still return an overall average for the remaining folds or tasks. The behavior now \
is to include them in the average, converting overall average metrics to 'nan' as well.")
# Save scores
with open(os.path.join(save_dir, TEST_SCORES_FILE_NAME), 'w') as f:
writer = csv.writer(f)
header = ['Task']
for metric in args.metrics:
header += [f'Mean {metric}', f'Standard deviation {metric}'] + \
[f'Fold {i} {metric}' for i in range(args.num_folds)]
writer.writerow(header)
if args.dataset_type == 'spectra': # spectra data type has only one score to report
row = ['spectra']
for metric, scores in all_scores.items():
task_scores = scores[:,0]
mean, std = np.mean(task_scores), np.std(task_scores)
row += [mean, std] + task_scores.tolist()
writer.writerow(row)
else: # all other data types, separate scores by task
for task_num, task_name in enumerate(args.task_names):
row = [task_name]
for metric, scores in all_scores.items():
task_scores = scores[:, task_num]
mean, std = np.mean(task_scores), np.std(task_scores)
row += [mean, std] + task_scores.tolist()
writer.writerow(row)
# Determine mean and std score of main metric
avg_scores = multitask_mean(all_scores[args.metric], metric=args.metric, axis=1)
mean_score, std_score = np.mean(avg_scores), np.std(avg_scores)
# Optionally merge and save test preds
if args.save_preds:
all_preds = pd.concat([pd.read_csv(os.path.join(save_dir, f'fold_{fold_num}', 'test_preds.csv'))
for fold_num in range(args.num_folds)])
all_preds.to_csv(os.path.join(save_dir, 'test_preds.csv'), index=False)
return mean_score, std_score
import pandas as pd
import glob
import os
from chemprop.args import TrainArgs
from chemprop.train import cross_validate
from chemprop.utils import create_logger
csvs = glob.glob(os.path.join('../data/tmprss2_meyer_et_al/', '*.csv'))
raw_data = pd.concat((pd.read_csv(f) for f in csvs))
chemprop_data = raw_data[['SMILES', 'Activity']]
chemprop_data.to_csv('chemprop_in.csv', index=False)
# argument passing pretty janky but it's set up to use command line
args = TrainArgs().parse_args(['--data_path', 'chemprop_in.csv', '--dataset_type', 'regression',
'--save_dir', 'models'])
logger = create_logger(name='train', save_dir=args.save_dir, quiet=args.quiet)
cross_validate(args, logger)
def grid_search(args: Namespace):
# Create loggers
logger = create_logger(name='hyperparameter_optimization', save_dir=args.log_dir, quiet=True)
train_logger = create_logger(name='train', save_dir=args.save_dir, quiet=args.quiet)
# Run grid search
results = []
# Define hyperparameter optimization
def objective(hyperparams: Dict[str, Union[int, float]]) -> float:
# Convert hyperparams from float to int when necessary
for key in INT_KEYS:
hyperparams[key] = int(hyperparams[key])
# Update args with hyperparams
hyper_args = deepcopy(args)
if args.save_dir is not None:
folder_name = '_'.join(f'{key}_{value}' for key, value in hyperparams.items())
hyper_args.save_dir = os.path.join(hyper_args.save_dir, folder_name)
for key, value in hyperparams.items():
setattr(hyper_args, key, value)
# Record hyperparameters
logger.info(hyperparams)
# Cross validate
mean_score, std_score = cross_validate(hyper_args, train_logger)
# Record results
temp_model = build_model(hyper_args)
num_params = param_count(temp_model)
logger.info(f'num params: {num_params:,}')
logger.info(f'{mean_score} +/- {std_score} {hyper_args.metric}')
results.append({
'mean_score': mean_score,
'std_score': std_score,
'hyperparams': hyperparams,
'num_params': num_params
})
# Deal with nan
if np.isnan(mean_score):
if hyper_args.dataset_type == 'classification':
mean_score = 0
else:
raise ValueError('Can\'t handle nan score for non-classification dataset.')
return (1 if hyper_args.minimize_score else -1) * mean_score
fmin(objective, SPACE, algo=tpe.suggest, max_evals=args.num_iters)
# Report best result
results = [result for result in results if not np.isnan(result['mean_score'])]
best_result = min(results, key=lambda result: (1 if args.minimize_score else -1) * result['mean_score'])
logger.info('best')
logger.info(best_result['hyperparams'])
logger.info(f'num params: {best_result["num_params"]:,}')
logger.info(f'{best_result["mean_score"]} +/- {best_result["std_score"]} {args.metric}')
# Save best hyperparameter settings as JSON config file
makedirs(args.config_save_path, isfile=True)
with open(args.config_save_path, 'w') as f:
json.dump(best_result['hyperparams'], f, indent=4, sort_keys=True)
def hyperopt(args: HyperoptArgs) -> None:
"""
Runs hyperparameter optimization on a Chemprop model.
Hyperparameter optimization optimizes the following parameters:
* :code:`hidden_size`: The hidden size of the neural network layers is selected from {300, 400, ..., 2400}
* :code:`depth`: The number of message passing iterations is selected from {2, 3, 4, 5, 6}
* :code:`dropout`: The dropout probability is selected from {0.0, 0.05, ..., 0.4}
* :code:`ffn_num_layers`: The number of feed-forward layers after message passing is selected from {1, 2, 3}
The best set of hyperparameters is saved as a JSON file to :code:`args.config_save_path`.
:param args: A :class:`~chemprop.args.HyperoptArgs` object containing arguments for hyperparameter
optimization in addition to all arguments needed for training.
"""
# Create logger
logger = create_logger(name=HYPEROPT_LOGGER_NAME, save_dir=args.log_dir, quiet=True)
# Run grid search
results = []
# Define hyperparameter optimization
def objective(hyperparams: Dict[str, Union[int, float]]) -> float:
# Convert hyperparams from float to int when necessary
for key in INT_KEYS:
hyperparams[key] = int(hyperparams[key])
# Copy args
hyper_args = deepcopy(args)
# Update args with hyperparams
if args.save_dir is not None:
folder_name = '_'.join(f'{key}_{value}' for key, value in hyperparams.items())
hyper_args.save_dir = os.path.join(hyper_args.save_dir, folder_name)
for key, value in hyperparams.items():
setattr(hyper_args, key, value)
hyper_args.ffn_hidden_size = hyper_args.hidden_size
# Record hyperparameters
logger.info(hyperparams)
# Cross validate
mean_score, std_score = cross_validate(args=hyper_args, train_func=run_training)
# Record results
temp_model = MoleculeModel(hyper_args)
num_params = param_count(temp_model)
logger.info(f'num params: {num_params:,}')
logger.info(f'{mean_score} +/- {std_score} {hyper_args.metric}')
results.append({
'mean_score': mean_score,
'std_score': std_score,
'hyperparams': hyperparams,
'num_params': num_params
})
# Deal with nan
if np.isnan(mean_score):
if hyper_args.dataset_type == 'classification':
mean_score = 0
else:
raise ValueError('Can\'t handle nan score for non-classification dataset.')
return (1 if hyper_args.minimize_score else -1) * mean_score
fmin(objective, SPACE, algo=tpe.suggest, max_evals=args.num_iters, rstate=np.random.RandomState(args.seed))
# Report best result
results = [result for result in results if not np.isnan(result['mean_score'])]
best_result = min(results, key=lambda result: (1 if args.minimize_score else -1) * result['mean_score'])
logger.info('best')
logger.info(best_result['hyperparams'])
logger.info(f'num params: {best_result["num_params"]:,}')
logger.info(f'{best_result["mean_score"]} +/- {best_result["std_score"]} {args.metric}')
# Save best hyperparameter settings as JSON config file
makedirs(args.config_save_path, isfile=True)
with open(args.config_save_path, 'w') as f:
json.dump(best_result['hyperparams'], f, indent=4, sort_keys=True)
def cross_validate(
args: TrainArgs, train_func: Callable[[TrainArgs, MoleculeDataset, Logger],
Dict[str, List[float]]]
) -> Tuple[float, float]:
"""
Runs k-fold cross-validation.
For each of k splits (folds) of the data, trains and tests a model on that split
and aggregates the performance across folds.
:param args: A :class:`~chemprop.args.TrainArgs` object containing arguments for
loading data and training the Chemprop model.
:param train_func: Function which runs training.
:return: A tuple containing the mean and standard deviation performance across folds.
"""
logger = create_logger(name=TRAIN_LOGGER_NAME,
save_dir=args.save_dir,
quiet=args.quiet)
if logger is not None:
debug, info = logger.debug, logger.info
else:
debug = info = print
# Initialize relevant variables
init_seed = args.seed
save_dir = args.save_dir
args.task_names = get_task_names(path=args.data_path,
smiles_column=args.smiles_column,
target_columns=args.target_columns,
ignore_columns=args.ignore_columns)
# Print command line
debug('Command line')
debug(f'python {" ".join(sys.argv)}')
# Print args
debug('Args')
debug(args)
# Save args
args.save(os.path.join(args.save_dir, 'args.json'))
# Get data
debug('Loading data')
data = get_data(path=args.data_path,
args=args,
logger=logger,
skip_none_targets=True)
validate_dataset_type(data, dataset_type=args.dataset_type)
args.features_size = data.features_size()
debug(f'Number of tasks = {args.num_tasks}')
# Run training on different random seeds for each fold
all_scores = defaultdict(list)
for fold_num in range(args.num_folds):
info(f'Fold {fold_num}')
args.seed = init_seed + fold_num
args.save_dir = os.path.join(save_dir, f'fold_{fold_num}')
makedirs(args.save_dir)
model_scores = train_func(
args, deepcopy(data),
logger) # deepcopy since data may be modified
for metric, scores in model_scores.items():
all_scores[metric].append(scores)
all_scores = dict(all_scores)
# Convert scores to numpy arrays
for metric, scores in all_scores.items():
all_scores[metric] = np.array(scores)
# Report results
info(f'{args.num_folds}-fold cross validation')
# Report scores for each fold
for fold_num in range(args.num_folds):
for metric, scores in all_scores.items():
info(
f'\tSeed {init_seed + fold_num} ==> test {metric} = {np.nanmean(scores[fold_num]):.6f}'
)
if args.show_individual_scores:
for task_name, score in zip(args.task_names, scores[fold_num]):
info(
f'\t\tSeed {init_seed + fold_num} ==> test {task_name} {metric} = {score:.6f}'
)
# Report scores across folds
for metric, scores in all_scores.items():
avg_scores = np.nanmean(
scores, axis=1) # average score for each model across tasks
mean_score, std_score = np.nanmean(avg_scores), np.nanstd(avg_scores)
info(f'Overall test {metric} = {mean_score:.6f} +/- {std_score:.6f}')
if args.show_individual_scores:
for task_num, task_name in enumerate(args.task_names):
info(
f'\tOverall test {task_name} {metric} = '
f'{np.nanmean(scores[:, task_num]):.6f} +/- {np.nanstd(scores[:, task_num]):.6f}'
)
# Save scores
with open(os.path.join(save_dir, TEST_SCORES_FILE_NAME), 'w') as f:
writer = csv.writer(f)
header = ['Task']
for metric in args.metrics:
header += [f'Mean {metric}', f'Standard deviation {metric}'] + \
[f'Fold {i} {metric}' for i in range(args.num_folds)]
writer.writerow(header)
for task_num, task_name in enumerate(args.task_names):
row = [task_name]
for metric, scores in all_scores.items():
task_scores = scores[:, task_num]
mean, std = np.nanmean(task_scores), np.nanstd(task_scores)
row += [mean, std] + task_scores.tolist()
writer.writerow(row)
# Determine mean and std score of main metric
avg_scores = np.nanmean(all_scores[args.metric], axis=1)
mean_score, std_score = np.nanmean(avg_scores), np.nanstd(avg_scores)
# Optionally merge and save test preds
if args.save_preds:
all_preds = pd.concat([
pd.read_csv(
os.path.join(save_dir, f'fold_{fold_num}', 'test_preds.csv'))
for fold_num in range(args.num_folds)
])
all_preds.to_csv(os.path.join(save_dir, 'test_preds.csv'), index=False)
return mean_score, std_score
def hyperopt(args: HyperoptArgs) -> None:
"""
Runs hyperparameter optimization on a Chemprop model.
Hyperparameter optimization optimizes the following parameters:
* :code:`hidden_size`: The hidden size of the neural network layers is selected from {300, 400, ..., 2400}
* :code:`depth`: The number of message passing iterations is selected from {2, 3, 4, 5, 6}
* :code:`dropout`: The dropout probability is selected from {0.0, 0.05, ..., 0.4}
* :code:`ffn_num_layers`: The number of feed-forward layers after message passing is selected from {1, 2, 3}
The best set of hyperparameters is saved as a JSON file to :code:`args.config_save_path`.
:param args: A :class:`~chemprop.args.HyperoptArgs` object containing arguments for hyperparameter
optimization in addition to all arguments needed for training.
"""
# Create logger
logger = create_logger(name=HYPEROPT_LOGGER_NAME, save_dir=args.log_dir, quiet=True)
# Load in manual trials
if args.manual_trial_dirs is not None:
manual_trials = load_manual_trials(args.manual_trial_dirs, SPACE.keys(), args)
logger.info(f'{len(manual_trials)} manual trials included in hyperparameter search.')
else:
manual_trials = None
logger.info('No manual trials loaded as part of hyperparameter search')
makedirs(args.hyperopt_checkpoint_dir)
# Define hyperparameter optimization
def objective(hyperparams: Dict[str, Union[int, float]], seed: int) -> Dict:
# Convert hyperparams from float to int when necessary
for key in INT_KEYS:
hyperparams[key] = int(hyperparams[key])
# Copy args
hyper_args = deepcopy(args)
# Update args with hyperparams
if args.save_dir is not None:
folder_name = '_'.join(f'{key}_{value}' for key, value in hyperparams.items())
hyper_args.save_dir = os.path.join(hyper_args.save_dir, folder_name)
for key, value in hyperparams.items():
setattr(hyper_args, key, value)
hyper_args.ffn_hidden_size = hyper_args.hidden_size
# Cross validate
mean_score, std_score = cross_validate(args=hyper_args, train_func=run_training)
# Record results
temp_model = MoleculeModel(hyper_args)
num_params = param_count(temp_model)
logger.info(f'Trial results with seed {seed}')
logger.info(hyperparams)
logger.info(f'num params: {num_params:,}')
logger.info(f'{mean_score} +/- {std_score} {hyper_args.metric}')
# Deal with nan
if np.isnan(mean_score):
if hyper_args.dataset_type == 'classification':
mean_score = 0
else:
raise ValueError('Can\'t handle nan score for non-classification dataset.')
loss = (1 if hyper_args.minimize_score else -1) * mean_score
return {
'loss': loss,
'status': 'ok',
'mean_score': mean_score,
'std_score': std_score,
'hyperparams': hyperparams,
'num_params': num_params,
'seed': seed,
}
# Iterate over a number of trials
for i in range(args.num_iters):
# run fmin and load trials in single steps to allow for parallel operation
trials = load_trials(dir_path=args.hyperopt_checkpoint_dir, previous_trials=manual_trials)
if len(trials) >= args.num_iters:
break
# Set a unique random seed for each trial. Pass it into objective function for logging purposes.
hyperopt_seed = get_hyperopt_seed(seed=args.seed, dir_path=args.hyperopt_checkpoint_dir)
fmin_objective = partial(objective, seed=hyperopt_seed)
os.environ['HYPEROPT_FMIN_SEED'] = str(hyperopt_seed) # this environment variable changes the seed in fmin
# Log the start of the trial
logger.info(f'Initiating trial with seed {hyperopt_seed}')
logger.info(f'Loaded {len(trials)} previous trials')
if len(trials) < args.startup_random_iters:
random_remaining = args.startup_random_iters - len(trials)
logger.info(f'Parameters assigned with random search, {random_remaining} random trials remaining')
else:
logger.info(f'Parameters assigned with TPE directed search')
fmin(
fmin_objective,
SPACE,
algo=partial(tpe.suggest, n_startup_jobs=args.startup_random_iters),
max_evals=len(trials) + 1,
trials=trials,
)
# Create a trials object with only the last instance by merging the last data with an empty trials object
last_trial = merge_trials(Trials(), [trials.trials[-1]])
save_trials(args.hyperopt_checkpoint_dir, last_trial, hyperopt_seed)
# Report best result
all_trials = load_trials(dir_path=args.hyperopt_checkpoint_dir, previous_trials=manual_trials)
results = all_trials.results
results = [result for result in results if not np.isnan(result['mean_score'])]
best_result = min(results, key=lambda result: (1 if args.minimize_score else -1) * result['mean_score'])
logger.info(f'Best trial, with seed {best_result["seed"]}')
logger.info(best_result['hyperparams'])
logger.info(f'num params: {best_result["num_params"]:,}')
logger.info(f'{best_result["mean_score"]} +/- {best_result["std_score"]} {args.metric}')
# Save best hyperparameter settings as JSON config file
makedirs(args.config_save_path, isfile=True)
with open(args.config_save_path, 'w') as f:
json.dump(best_result['hyperparams'], f, indent=4, sort_keys=True)
if __name__ == '__main__':
parser = ArgumentParser()
add_train_args(parser)
parser.add_argument('--class_weight', type=str,
choices=['balanced'],
help='How to weight classes (None means no class balance)')
parser.add_argument('--single_task', action='store_true', default=False,
help='Whether to run each task separately (needed when dataset has null entries)')
parser.add_argument('--radius', type=int, default=2,
help='Morgan fingerprint radius')
parser.add_argument('--num_bits', type=int, default=2048,
help='Number of bits in morgan fingerprint')
parser.add_argument('--num_trees', type=int, default=500,
help='Number of random forest trees')
args = parser.parse_args()
modify_train_args(args)
logger = create_logger(name='random_forest', save_dir=args.save_dir, quiet=args.quiet)
if args.metric is None:
if args.dataset_type == 'regression':
args.metric = 'rmse'
elif args.dataset_type == 'classification':
args.metric = 'auc'
else:
raise ValueError(f'Default metric not supported for dataset_type "{args.dataset_type}"')
cross_validate_random_forest(args, logger)
