SmoothOut: Smoothing Out Sharp Minima to Improve Generalization in Deep Learning
Related paper
This is the code of paper https://arxiv.org/abs/1805.07898 . In SGD, especially large-batch SGD, of deep neural networks, Some hypothesize that the convergence to sharp minima is the reason of bad generalization. In the paper, smoothout method is proposed to eliminate sharp minima in deep neural networks to improve generalization.
Tutorial to be updated soon.
Usage
python evaluate.py --model alexnet --dataset imagenet -b 100 --gpus 1 --evaluate TrainingResults/2018-03-17_11-28-33/model_best.pth.tar --ss 0.006 --mode train --no-augment
python visualize_sharpness.py --model resnet --dataset cifar10 -b 100 --gpus 1 --evaluate TrainingResults/2018-02-20_19-47-52/model_best.pth.tar --slave-evaluate TrainingResults/2018-02-20_19-47-18/model_best.pth.tar --no-visualize_train
python visualize2_sharpness.py --model resnet --dataset cifar10 -b 100 --gpus 1 --evaluate TrainingResults/2018-02-20_19-47-18/model_best.pth.tar --no-visualize_train --alpha="-0.3:0.02:0.31"
python measure_sharpness.py --model cifar100_shallow --dataset cifar100 --b 100 --gpus 1 --evaluate TrainingResults/2018-02-20_14-05-28/model_best.pth.tar
Dependencies
- pytorch ('0.3.1')
- torchvision to load the datasets, perform image transforms ('0.2.0')
- pandas for logging to csv ('0.23.0')
- bokeh for training visualization
conda install bokeh=0.12.0
Data
- Configure your dataset path at data.py.
- To get the ILSVRC data, you should register on their site for access: http://www.image-net.org/ and
mkdir -p pytorch-gen/imagenet
cd pytorch-gen/imagenet
ln -s ${YOUR_IMAGENET_PATH}/train/ train
ln -s ${YOUR_IMAGENET_PATH}/validation/ val
Model configuration
Network model is defined by writing a .py file in models
folder, and selecting it using the model
flag. Model function must be registered in models/__init__.py
The model function must return a trainable network. It can also specify additional training options such optimization regime (either a dictionary or a function), and input transform modifications.
e.g for a model definition:
class Model(nn.Module):
def __init__(self, num_classes=1000):
super(Model, self).__init__()
self.model = nn.Sequential(...)
self.regime = {
0: {'optimizer': 'SGD', 'lr': 1e-2,
'weight_decay': 5e-4, 'momentum': 0.9},
15: {'lr': 1e-3, 'weight_decay': 0}
}
self.input_transform = {
'train': transforms.Compose([...]),
'eval': transforms.Compose([...])
}
def forward(self, inputs):
return self.model(inputs)
def model(**kwargs):
return Model()