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OOD_Generate_Mahalanobis.py
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OOD_Generate_Mahalanobis.py
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"""
Created on Sun Oct 21 2018
@author: Kimin Lee
"""
from __future__ import print_function
import argparse
import torch
import data_loader
import numpy as np
import models
import os
import lib_generation
from torchvision import transforms
from torch.autograd import Variable
parser = argparse.ArgumentParser(description='PyTorch code: Mahalanobis detector')
parser.add_argument('--batch_size', type=int, default=20, metavar='N', help='batch size for data loader')
parser.add_argument('--dataset', required=True, help='cifar10 | cifar100 | svhn')
parser.add_argument('--dataroot', default='./data', help='path to dataset')
parser.add_argument('--outf', default='./output/', help='folder to output results')
parser.add_argument('--num_classes', type=int, default=10, help='the # of classes')
parser.add_argument('--net_type', required=True, help='resnet | densenet')
parser.add_argument('--gpu', type=int, default=0, help='gpu index')
args = parser.parse_args()
print(args)
def main():
# set the path to pre-trained model and output
pre_trained_net = './pre_trained/' + args.net_type + '_' + args.dataset + '.pth'
args.outf = args.outf + args.net_type + '_' + args.dataset + '/'
if os.path.isdir(args.outf) == False:
os.mkdir(args.outf)
torch.cuda.manual_seed(0)
torch.cuda.set_device(args.gpu)
# check the in-distribution dataset
if args.dataset == 'cifar100':
args.num_classes = 100
if args.dataset == 'svhn':
out_dist_list = ['cifar10', 'imagenet_resize', 'lsun_resize']
else:
out_dist_list = ['svhn', 'imagenet_resize', 'lsun_resize']
# load networks
if args.net_type == 'densenet':
if args.dataset == 'svhn':
model = models.DenseNet3(100, int(args.num_classes))
model.load_state_dict(torch.load(pre_trained_net, map_location = "cuda:" + str(args.gpu)))
else:
"""
workaround pytorch.load(pickle) limitation:
https://github.com/pytorch/pytorch/issues/3678
"""
# import sys; sys.path.insert(0, './models')
model = torch.load(pre_trained_net, map_location = "cuda:" + str(args.gpu))
for i, (name, module) in enumerate(model._modules.items()):
module = recursion_change_bn(model)
for m in model.modules():
if 'Conv' in str(type(m)):
setattr(m, 'padding_mode', 'zeros')
in_transform = transforms.Compose([transforms.ToTensor(), transforms.Normalize((125.3/255, 123.0/255, 113.9/255), (63.0/255, 62.1/255.0, 66.7/255.0)),])
elif args.net_type == 'resnet':
model = models.ResNet34(num_c=args.num_classes)
model.load_state_dict(torch.load(pre_trained_net, map_location = "cuda:" + str(args.gpu)))
in_transform = transforms.Compose([transforms.ToTensor(), transforms.Normalize((0.4914, 0.4822, 0.4465), (0.2023, 0.1994, 0.2010)),])
model.cuda()
print('load model: ' + args.net_type)
# load dataset
print('load target data: ', args.dataset)
train_loader, test_loader = data_loader.getTargetDataSet(args.dataset, args.batch_size, in_transform, args.dataroot)
# set information about feature extaction
model.eval()
temp_x = torch.rand(2,3,32,32).cuda()
temp_x = Variable(temp_x)
temp_list = model.feature_list(temp_x)[1]
num_output = len(temp_list)
feature_list = np.empty(num_output)
count = 0
for out in temp_list:
feature_list[count] = out.size(1)
count += 1
print('get sample mean and covariance')
sample_mean, precision = lib_generation.sample_estimator(model, args.num_classes, feature_list, train_loader)
print('get Mahalanobis scores')
m_list = [0.0, 0.01, 0.005, 0.002, 0.0014, 0.001, 0.0005]
for magnitude in m_list:
print('Noise: ' + str(magnitude))
for i in range(num_output):
M_in = lib_generation.get_Mahalanobis_score(model, test_loader, args.num_classes, args.outf, \
True, args.net_type, sample_mean, precision, i, magnitude)
M_in = np.asarray(M_in, dtype=np.float32)
if i == 0:
Mahalanobis_in = M_in.reshape((M_in.shape[0], -1))
else:
Mahalanobis_in = np.concatenate((Mahalanobis_in, M_in.reshape((M_in.shape[0], -1))), axis=1)
for out_dist in out_dist_list:
out_test_loader = data_loader.getNonTargetDataSet(out_dist, args.batch_size, in_transform, args.dataroot)
print('Out-distribution: ' + out_dist)
for i in range(num_output):
M_out = lib_generation.get_Mahalanobis_score(model, out_test_loader, args.num_classes, args.outf, \
False, args.net_type, sample_mean, precision, i, magnitude)
M_out = np.asarray(M_out, dtype=np.float32)
if i == 0:
Mahalanobis_out = M_out.reshape((M_out.shape[0], -1))
else:
Mahalanobis_out = np.concatenate((Mahalanobis_out, M_out.reshape((M_out.shape[0], -1))), axis=1)
Mahalanobis_in = np.asarray(Mahalanobis_in, dtype=np.float32)
Mahalanobis_out = np.asarray(Mahalanobis_out, dtype=np.float32)
Mahalanobis_data, Mahalanobis_labels = lib_generation.merge_and_generate_labels(Mahalanobis_out, Mahalanobis_in)
file_name = os.path.join(args.outf, 'Mahalanobis_%s_%s_%s.npy' % (str(magnitude), args.dataset , out_dist))
Mahalanobis_data = np.concatenate((Mahalanobis_data, Mahalanobis_labels), axis=1)
np.save(file_name, Mahalanobis_data)
def recursion_change_bn(module):
"""
Converts a model trained with pytorch0.3.x to a pytorch > 0.4.0 compatible model
"""
if isinstance(module, torch.nn.BatchNorm2d):
module.track_running_stats = 1
else:
for i, (name, module1) in enumerate(module._modules.items()):
module1 = recursion_change_bn(module1)
return module
if __name__ == '__main__':
main()