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HashNet.py
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HashNet.py
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from utils.tools import *
from network import *
import os
import torch
import torch.optim as optim
import time
import numpy as np
torch.multiprocessing.set_sharing_strategy('file_system')
# HashNet(ICCV2017)
# paper [HashNet: Deep Learning to Hash by Continuation](http://openaccess.thecvf.com/content_ICCV_2017/papers/Cao_HashNet_Deep_Learning_ICCV_2017_paper.pdf)
# code [HashNet caffe and pytorch](https://github.com/thuml/HashNet)
def get_config():
config = {
"alpha": 0.1,
# "optimizer":{"type": optim.SGD, "optim_params": {"lr": 0.001, "weight_decay": 10 ** -5}, "lr_type": "step"},
"optimizer": {"type": optim.RMSprop, "optim_params": {"lr": 1e-5, "weight_decay": 10 ** -5}, "lr_type": "step"},
"info": "[HashNet]",
"step_continuation": 20,
"resize_size": 256,
"crop_size": 224,
"batch_size": 64,
"net": AlexNet,
# "net":ResNet,
# "dataset": "cifar10",
"dataset": "cifar10-1",
# "dataset": "cifar10-2",
# "dataset": "coco",
# "dataset": "mirflickr",
# "dataset": "voc2012",
# "dataset": "imagenet",
# "dataset": "nuswide_21",
# "dataset": "nuswide_21_m",
# "dataset": "nuswide_81_m",
"epoch": 150,
"test_map": 15,
"save_path": "save/HashNet",
# "device":torch.device("cpu"),
"device": torch.device("cuda:1"),
"bit_list": [48],
}
config = config_dataset(config)
return config
class HashNetLoss(torch.nn.Module):
def __init__(self, config, bit):
super(HashNetLoss, self).__init__()
self.U = torch.zeros(config["num_train"], bit).float().to(config["device"])
self.Y = torch.zeros(config["num_train"], config["n_class"]).float().to(config["device"])
self.scale = 1
def forward(self, u, y, ind, config):
u = torch.tanh(self.scale * u)
self.U[ind, :] = u.data
self.Y[ind, :] = y.float()
similarity = (y @ self.Y.t() > 0).float()
dot_product = config["alpha"] * u @ self.U.t()
mask_positive = similarity.data > 0
mask_negative = similarity.data <= 0
exp_loss = (1 + (-dot_product.abs()).exp()).log() + dot_product.clamp(min=0) - similarity * dot_product
# weight
S1 = mask_positive.float().sum()
S0 = mask_negative.float().sum()
S = S0 + S1
exp_loss[mask_positive] = exp_loss[mask_positive] * (S / S1)
exp_loss[mask_negative] = exp_loss[mask_negative] * (S / S0)
loss = exp_loss.sum() / S
return loss
def train_val(config, bit):
device = config["device"]
train_loader, test_loader, dataset_loader, num_train, num_test, num_dataset = get_data(config)
config["num_train"] = num_train
net = config["net"](bit).to(device)
optimizer = config["optimizer"]["type"](net.parameters(), **(config["optimizer"]["optim_params"]))
criterion = HashNetLoss(config, bit)
Best_mAP = 0
for epoch in range(config["epoch"]):
criterion.scale = (epoch // config["step_continuation"] + 1) ** 0.5
current_time = time.strftime('%H:%M:%S', time.localtime(time.time()))
print("%s[%2d/%2d][%s] bit:%d, dataset:%s, scale:%.3f, training...." % (
config["info"], epoch + 1, config["epoch"], current_time, bit, config["dataset"], criterion.scale), end="")
net.train()
train_loss = 0
for image, label, ind in train_loader:
image = image.to(device)
label = label.to(device)
optimizer.zero_grad()
u = net(image)
loss = criterion(u, label.float(), ind, config)
train_loss += loss.item()
loss.backward()
optimizer.step()
train_loss = train_loss / len(train_loader)
print("\b\b\b\b\b\b\b loss:%.3f" % (train_loss))
if (epoch + 1) % config["test_map"] == 0:
# print("calculating test binary code......")
tst_binary, tst_label = compute_result(test_loader, net, device=device)
# print("calculating dataset binary code.......")\
trn_binary, trn_label = compute_result(dataset_loader, net, device=device)
# print("calculating map.......")
mAP = CalcTopMap(trn_binary.numpy(), tst_binary.numpy(), trn_label.numpy(), tst_label.numpy(),
config["topK"])
if mAP > Best_mAP:
Best_mAP = mAP
if "save_path" in config:
if not os.path.exists(config["save_path"]):
os.makedirs(config["save_path"])
print("save in ", config["save_path"])
np.save(os.path.join(config["save_path"], config["dataset"] + str(mAP) + "-" + "trn_binary.npy"),
trn_binary.numpy())
torch.save(net.state_dict(),
os.path.join(config["save_path"], config["dataset"] + "-" + str(mAP) + "-model.pt"))
print("%s epoch:%d, bit:%d, dataset:%s, MAP:%.3f, Best MAP: %.3f" % (
config["info"], epoch + 1, bit, config["dataset"], mAP, Best_mAP))
print(config)
if __name__ == "__main__":
config = get_config()
print(config)
for bit in config["bit_list"]:
train_val(config, bit)