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train.py
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import torch
import torch.nn as nn
import torch.nn.functional as F
from torch.autograd import Variable
from metric import compress_wiki, compress, calculate_map, calculate_top_map
import datasets
import settings
from models import ImgNet, TxtNet
import os.path as osp
class Session:
def __init__(self):
self.logger = settings.logger
torch.manual_seed(1)
torch.cuda.manual_seed_all(1)
torch.cuda.set_device(settings.GPU_ID)
if settings.DATASET == "WIKI":
self.train_dataset = datasets.WIKI(root=settings.DATA_DIR, train=True, transform=datasets.wiki_train_transform)
self.test_dataset = datasets.WIKI(root=settings.DATA_DIR, train=False, transform=datasets.wiki_test_transform)
self.database_dataset = datasets.WIKI(root=settings.DATA_DIR, train=True, transform=datasets.wiki_test_transform)
if settings.DATASET == "MIRFlickr":
self.train_dataset = datasets.MIRFlickr(train=True, transform=datasets.mir_train_transform)
self.test_dataset = datasets.MIRFlickr(train=False, database=False, transform=datasets.mir_test_transform)
self.database_dataset = datasets.MIRFlickr(train=False, database=True, transform=datasets.mir_test_transform)
if settings.DATASET == "NUSWIDE":
self.train_dataset = datasets.NUSWIDE(train=True, transform=datasets.nus_train_transform)
self.test_dataset = datasets.NUSWIDE(train=False, database=False, transform=datasets.nus_test_transform)
self.database_dataset = datasets.NUSWIDE(train=False, database=True, transform=datasets.nus_test_transform)
# Data Loader (Input Pipeline)
self.train_loader = torch.utils.data.DataLoader(dataset=self.train_dataset,
batch_size=settings.BATCH_SIZE,
shuffle=True,
num_workers=settings.NUM_WORKERS,
drop_last=True)
self.test_loader = torch.utils.data.DataLoader(dataset=self.test_dataset,
batch_size=settings.BATCH_SIZE,
shuffle=False,
num_workers=settings.NUM_WORKERS)
self.database_loader = torch.utils.data.DataLoader(dataset=self.database_dataset,
batch_size=settings.BATCH_SIZE,
shuffle=False,
num_workers=settings.NUM_WORKERS)
self.CodeNet_I = ImgNet(code_len=settings.CODE_LEN)
self.FeatNet_I = ImgNet(code_len=settings.CODE_LEN)
txt_feat_len = datasets.txt_feat_len
self.CodeNet_T = TxtNet(code_len=settings.CODE_LEN, txt_feat_len=txt_feat_len)
if settings.DATASET == "WIKI":
self.opt_I = torch.optim.SGD([{'params': self.CodeNet_I.fc_encode.parameters(), 'lr': settings.LR_IMG},
{'params': self.CodeNet_I.alexnet.classifier.parameters(), 'lr': settings.LR_IMG}],
momentum=settings.MOMENTUM, weight_decay=settings.WEIGHT_DECAY)
if settings.DATASET == "MIRFlickr" or settings.DATASET == "NUSWIDE":
self.opt_I = torch.optim.SGD(self.CodeNet_I.parameters(), lr=settings.LR_IMG, momentum=settings.MOMENTUM, weight_decay=settings.WEIGHT_DECAY)
self.opt_T = torch.optim.SGD(self.CodeNet_T.parameters(), lr=settings.LR_TXT, momentum=settings.MOMENTUM, weight_decay=settings.WEIGHT_DECAY)
def train(self, epoch):
self.CodeNet_I.cuda().train()
self.FeatNet_I.cuda().eval()
self.CodeNet_T.cuda().train()
self.CodeNet_I.set_alpha(epoch)
self.CodeNet_T.set_alpha(epoch)
self.logger.info('Epoch [%d/%d], alpha for ImgNet: %.3f, alpha for TxtNet: %.3f' % (epoch + 1, settings.NUM_EPOCH, self.CodeNet_I.alpha, self.CodeNet_T.alpha))
for idx, (img, F_T, labels, _) in enumerate(self.train_loader):
img = Variable(img.cuda())
F_T = Variable(torch.FloatTensor(F_T.numpy()).cuda())
labels = Variable(labels.cuda())
self.opt_I.zero_grad()
self.opt_T.zero_grad()
F_I , _, _ = self.FeatNet_I(img)
_, hid_I, code_I = self.CodeNet_I(img)
_, hid_T, code_T = self.CodeNet_T(F_T)
F_I = F.normalize(F_I)
S_I = F_I.mm(F_I.t())
S_I = S_I * 2 - 1
F_T = F.normalize(F_T)
S_T = F_T.mm(F_T.t())
S_T = S_T * 2 - 1
B_I = F.normalize(code_I)
B_T = F.normalize(code_T)
BI_BI = B_I.mm(B_I.t())
BT_BT = B_T.mm(B_T.t())
BI_BT = B_I.mm(B_T.t())
S_tilde = settings.BETA * S_I + (1 - settings.BETA) * S_T
S = (1 - settings.ETA) * S_tilde + settings.ETA * S_tilde.mm(S_tilde) / settings.BATCH_SIZE
S = S * settings.MU
loss1 = F.mse_loss(BI_BI, S)
loss2 = F.mse_loss(BI_BT, S)
loss3 = F.mse_loss(BT_BT, S)
loss = settings.LAMBDA1 * loss1 + 1 * loss2 + settings.LAMBDA2 * loss3
loss.backward()
self.opt_I.step()
self.opt_T.step()
if (idx + 1) % (len(self.train_dataset) // settings.BATCH_SIZE / settings.EPOCH_INTERVAL) == 0:
self.logger.info('Epoch [%d/%d], Iter [%d/%d] Loss1: %.4f Loss2: %.4f Loss3: %.4f Total Loss: %.4f'
% (epoch + 1, settings.NUM_EPOCH, idx + 1, len(self.train_dataset) // settings.BATCH_SIZE,
loss1.data[0], loss2.data[0], loss3.data[0], loss.data[0]))
def eval(self):
self.logger.info('--------------------Evaluation: Calculate top MAP-------------------')
# Change model to 'eval' mode (BN uses moving mean/var).
self.CodeNet_I.eval().cuda()
self.CodeNet_T.eval().cuda()
if settings.DATASET == "WIKI":
re_BI, re_BT, re_L, qu_BI, qu_BT, qu_L = compress_wiki(self.database_loader, self.test_loader, self.CodeNet_I, self.CodeNet_T, self.database_dataset, self.test_dataset)
if settings.DATASET == "MIRFlickr" or settings.DATASET == "NUSWIDE":
re_BI, re_BT, re_L, qu_BI, qu_BT, qu_L = compress(self.database_loader, self.test_loader, self.CodeNet_I, self.CodeNet_T, self.database_dataset, self.test_dataset)
MAP_I2T = calculate_top_map(qu_B=qu_BI, re_B=re_BT, qu_L=qu_L, re_L=re_L, topk=50)
MAP_T2I = calculate_top_map(qu_B=qu_BT, re_B=re_BI, qu_L=qu_L, re_L=re_L, topk=50)
self.logger.info('MAP of Image to Text: %.3f, MAP of Text to Image: %.3f' % (MAP_I2T, MAP_T2I))
self.logger.info('--------------------------------------------------------------------')
def save_checkpoints(self, step, file_name='latest.pth'):
ckp_path = osp.join(settings.MODEL_DIR, file_name)
obj = {
'ImgNet': self.CodeNet_I.state_dict(),
'TxtNet': self.CodeNet_T.state_dict(),
'step': step,
}
torch.save(obj, ckp_path)
self.logger.info('**********Save the trained model successfully.**********')
def load_checkpoints(self, file_name='latest.pth'):
ckp_path = osp.join(settings.MODEL_DIR, file_name)
try:
obj = torch.load(ckp_path, map_location=lambda storage, loc: storage.cuda())
self.logger.info('**************** Load checkpoint %s ****************' % ckp_path)
except IOError:
self.logger.error('********** No checkpoint %s!*********' % ckp_path)
return
self.CodeNet_I.load_state_dict(obj['ImgNet'])
self.CodeNet_T.load_state_dict(obj['TxtNet'])
self.logger.info('********** The loaded model has been trained for %d epochs.*********' % obj['step'])
def main():
sess = Session()
if settings.EVAL == True:
sess.load_checkpoints()
sess.eval()
else :
for epoch in range(settings.NUM_EPOCH):
# train the Model
sess.train(epoch)
# eval the Model
if (epoch + 1) % settings.EVAL_INTERVAL == 0:
sess.eval()
# save the model
if epoch + 1 == settings.NUM_EPOCH:
sess.save_checkpoints(step=epoch+1)
if __name__ == '__main__':
main()