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test.py
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test.py
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import os
import argparse
import torch
from tqdm import tqdm
import data_loader.data_loaders as module_data
import model.loss as module_loss
import model.metric as module_metric
import model.model as module_arch
from train import get_instance
def main(config, resume):
# setup data_loader instances
data_loader = getattr(module_data, config['data_loader']['type'])(
config['data_loader']['args']['data_dir'],
batch_size=512,
shuffle=False,
validation_split=0.0,
training=False,
num_workers=2
)
# build model architecture
model = get_instance(module_arch, 'arch', config)
model.summary()
# get function handles of loss and metrics
loss_fn = getattr(module_loss, config['loss'])
metric_fns = [getattr(module_metric, met) for met in config['metrics']]
# load state dict
checkpoint = torch.load(resume)
state_dict = checkpoint['state_dict']
if config['n_gpu'] > 1:
model = torch.nn.DataParallel(model)
model.load_state_dict(state_dict)
# prepare model for testing
device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
model = model.to(device)
model.eval()
total_loss = 0.0
total_metrics = torch.zeros(len(metric_fns))
with torch.no_grad():
for i, (data, target) in enumerate(tqdm(data_loader)):
data, target = data.to(device), target.to(device)
output = model(data)
#
# save sample images, or do something with output here
#
# computing loss, metrics on test set
loss = loss_fn(output, target)
batch_size = data.shape[0]
total_loss += loss.item() * batch_size
for i, metric in enumerate(metric_fns):
total_metrics[i] += metric(output, target) * batch_size
n_samples = len(data_loader.sampler)
log = {'loss': total_loss / n_samples}
log.update({met.__name__: total_metrics[i].item() / n_samples for i, met in enumerate(metric_fns)})
print(log)
if __name__ == '__main__':
parser = argparse.ArgumentParser(description='PyTorch Template')
parser.add_argument('-r', '--resume', default=None, type=str,
help='path to latest checkpoint (default: None)')
parser.add_argument('-d', '--device', default=None, type=str,
help='indices of GPUs to enable (default: all)')
args = parser.parse_args()
if args.resume:
config = torch.load(args.resume)['config']
if args.device:
os.environ["CUDA_VISIBLE_DEVICES"] = args.device
main(config, args.resume)