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train_pre_a_s2.py
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train_pre_a_s2.py
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from __future__ import print_function, absolute_import
import argparse
import os.path as osp
import random
import numpy as np
import sys
from sklearn.cluster import KMeans
from sklearn.preprocessing import normalize
import torch
from torch import nn
from torch.backends import cudnn
from torch.utils.data import DataLoader
from awb import datasets
from awb import models_pre_a_s2
from awb.trainers import MMTTrainer
from awb.evaluators import Evaluator, extract_features
from awb.utils.data import IterLoader
from awb.utils.data import transforms as T
from awb.utils.data.sampler import RandomMultipleGallerySampler
from awb.utils.data.preprocessor import Preprocessor
from awb.utils.logging import Logger
from awb.utils.serialization import load_checkpoint, save_checkpoint, copy_state_dict
start_epoch = best_mAP = 0
def get_data(name, data_dir):
root = osp.join(data_dir, name)
dataset = datasets.create(name, root)
return dataset
def get_train_loader(dataset, height, width, batch_size, workers,
num_instances, iters):
normalizer = T.Normalize(mean=[0.485, 0.456, 0.406],
std=[0.229, 0.224, 0.225])
train_transformer = T.Compose([
T.Resize((height, width), interpolation=3),
T.RandomHorizontalFlip(),
T.Pad(10),
T.RandomCrop((height, width)),
T.ToTensor(),
normalizer,
T.RandomErasing(probability=0.5, mean=[0.485, 0.456, 0.406])
])
train_set = dataset.train
rmgs_flag = num_instances > 0
if rmgs_flag:
sampler = RandomMultipleGallerySampler(train_set, num_instances)
else:
sampler = None
train_loader = IterLoader(
DataLoader(Preprocessor(train_set, root=dataset.images_dir,
transform=train_transformer, mutual=True),
batch_size=batch_size, num_workers=workers, sampler=sampler,
shuffle=not rmgs_flag, pin_memory=True, drop_last=True), length=iters)
return train_loader
def get_test_loader(dataset, height, width, batch_size, workers, testset=None):
normalizer = T.Normalize(mean=[0.485, 0.456, 0.406],
std=[0.229, 0.224, 0.225])
test_transformer = T.Compose([
T.Resize((height, width), interpolation=3),
T.ToTensor(),
normalizer
])
if (testset is None):
testset = list(set(dataset.query) | set(dataset.gallery))
test_loader = DataLoader(
Preprocessor(testset, root=dataset.images_dir, transform=test_transformer),
batch_size=batch_size, num_workers=workers,
shuffle=False, pin_memory=True)
return test_loader
def create_model(args):
model_1 = models_pre_a_s2.create(args.arch, num_features=args.features, dropout=args.dropout, num_classes=args.num_clusters)
model_2 = models_pre_a_s2.create(args.arch, num_features=args.features, dropout=args.dropout, num_classes=args.num_clusters)
model_1_ema = models_pre_a_s2.create(args.arch, num_features=args.features, dropout=args.dropout, num_classes=args.num_clusters)
model_2_ema = models_pre_a_s2.create(args.arch, num_features=args.features, dropout=args.dropout, num_classes=args.num_clusters)
model_1.cuda()
model_2.cuda()
model_1_ema.cuda()
model_2_ema.cuda()
model_1 = nn.DataParallel(model_1)
model_2 = nn.DataParallel(model_2)
model_1_ema = nn.DataParallel(model_1_ema)
model_2_ema = nn.DataParallel(model_2_ema)
initial_weights = load_checkpoint(args.init_1)
copy_state_dict(initial_weights['state_dict'], model_1)
copy_state_dict(initial_weights['state_dict'], model_1_ema)
model_1_ema.module.classifier.weight.data.copy_(model_1.module.classifier.weight.data)
initial_weights = load_checkpoint(args.init_2)
copy_state_dict(initial_weights['state_dict'], model_2)
copy_state_dict(initial_weights['state_dict'], model_2_ema)
model_2_ema.module.classifier.weight.data.copy_(model_2.module.classifier.weight.data)
for param in model_1_ema.parameters():
param.detach_()
for param in model_2_ema.parameters():
param.detach_()
return model_1, model_2, model_1_ema, model_2_ema
def main():
args = parser.parse_args()
if args.seed is not None:
random.seed(args.seed)
np.random.seed(args.seed)
torch.manual_seed(args.seed)
cudnn.deterministic = True
main_worker(args)
def main_worker(args):
global start_epoch, best_mAP
cudnn.benchmark = True
sys.stdout = Logger(osp.join(args.logs_dir, 'log.txt'))
print("==========\nArgs:{}\n==========".format(args))
# Create data loaders
iters = args.iters if (args.iters>0) else None
dataset_target = get_data(args.dataset_target, args.data_dir)
test_loader_target = get_test_loader(dataset_target, args.height, args.width, args.batch_size, args.workers)
# Create model
model_1, model_2, model_1_ema, model_2_ema = create_model(args)
# Evaluator
evaluator_1_ema = Evaluator(model_1_ema)
evaluator_2_ema = Evaluator(model_2_ema)
clusters = [args.num_clusters]*args.epochs
feature_length = args.features if args.features>0 else 2048
moving_avg_features = np.zeros((len(dataset_target.train), feature_length))
for nc in range(len(clusters)):
cluster_loader = get_test_loader(dataset_target, args.height, args.width, args.batch_size, args.workers, testset=dataset_target.train)
dict_f, _ = extract_features(model_1_ema, cluster_loader, print_freq=50)
cf_1 = torch.stack(list(dict_f.values())).numpy()
dict_f, _ = extract_features(model_2_ema, cluster_loader, print_freq=50)
cf_2 = torch.stack(list(dict_f.values())).numpy()
cf = (cf_1+cf_2)/2
moving_avg_features = moving_avg_features.astype(np.float32)
cf = cf.astype(np.float32)
moving_avg_features = moving_avg_features*args.moving_avg_momentum+cf*(1-args.moving_avg_momentum)
moving_avg_features = moving_avg_features / (1-args.moving_avg_momentum**(nc+1))
print('\n Clustering into {} classes \n'.format(clusters[nc]))
km = KMeans(n_clusters=clusters[nc], random_state=args.seed, n_jobs=2).fit(moving_avg_features)
model_1.module.classifier.weight.data.copy_(torch.from_numpy(normalize(km.cluster_centers_, axis=1)).float().cuda())
model_2.module.classifier.weight.data.copy_(torch.from_numpy(normalize(km.cluster_centers_, axis=1)).float().cuda())
model_1_ema.module.classifier.weight.data.copy_(torch.from_numpy(normalize(km.cluster_centers_, axis=1)).float().cuda())
model_2_ema.module.classifier.weight.data.copy_(torch.from_numpy(normalize(km.cluster_centers_, axis=1)).float().cuda())
target_label = km.labels_
# change pseudo labels
for i in range(len(dataset_target.train)):
dataset_target.train[i] = list(dataset_target.train[i])
dataset_target.train[i][1] = int(target_label[i])
dataset_target.train[i] = tuple(dataset_target.train[i])
train_loader_target = get_train_loader(dataset_target, args.height, args.width,
args.batch_size, args.workers, args.num_instances, iters)
# Optimizer
params = []
for key, value in model_1.named_parameters():
if not value.requires_grad:
continue
params += [{"params": [value], "lr": args.lr, "weight_decay": args.weight_decay}]
for key, value in model_2.named_parameters():
if not value.requires_grad:
continue
params += [{"params": [value], "lr": args.lr, "weight_decay": args.weight_decay}]
optimizer = torch.optim.Adam(params)
# Trainer
trainer = MMTTrainer(model_1, model_2, model_1_ema, model_2_ema,
num_cluster=clusters[nc], alpha=args.alpha)
train_loader_target.new_epoch()
epoch = nc
trainer.train(epoch, train_loader_target, optimizer,
ce_soft_weight=args.soft_ce_weight, tri_soft_weight=args.soft_tri_weight,
print_freq=args.print_freq, train_iters=len(train_loader_target))
def save_model(model_ema, is_best, best_mAP, mid):
save_checkpoint({
'state_dict': model_ema.state_dict(),
'epoch': epoch + 1,
'best_mAP': best_mAP,
}, is_best, fpath=osp.join(args.logs_dir, 'model'+str(mid)+'_checkpoint.pth.tar'))
if ((epoch+1)%args.eval_step==0 or (epoch==args.epochs-1)):
mAP_1 = evaluator_1_ema.evaluate(test_loader_target, dataset_target.query, dataset_target.gallery, cmc_flag=False)
mAP_2 = evaluator_2_ema.evaluate(test_loader_target, dataset_target.query, dataset_target.gallery, cmc_flag=False)
is_best = (mAP_1>best_mAP) or (mAP_2>best_mAP)
best_mAP = max(mAP_1, mAP_2, best_mAP)
save_model(model_1_ema, (is_best and (mAP_1>mAP_2)), best_mAP, 1)
save_model(model_2_ema, (is_best and (mAP_1<=mAP_2)), best_mAP, 2)
print('\n * Finished epoch {:3d} model no.1 mAP: {:5.1%} model no.2 mAP: {:5.1%} best: {:5.1%}{}\n'.
format(epoch, mAP_1, mAP_2, best_mAP, ' *' if is_best else ''))
print ('Test on the best model.')
checkpoint = load_checkpoint(osp.join(args.logs_dir, 'model_best.pth.tar'))
model_1_ema.load_state_dict(checkpoint['state_dict'])
evaluator_1_ema.evaluate(test_loader_target, dataset_target.query, dataset_target.gallery, cmc_flag=True)
if __name__ == '__main__':
parser = argparse.ArgumentParser(description="MMT Training")
# data
parser.add_argument('-dt', '--dataset-target', type=str, default='market1501',
choices=datasets.names())
parser.add_argument('-b', '--batch-size', type=int, default=64)
parser.add_argument('-j', '--workers', type=int, default=4)
parser.add_argument('--num-clusters', type=int, default=500)
parser.add_argument('--height', type=int, default=256,
help="input height")
parser.add_argument('--width', type=int, default=128,
help="input width")
parser.add_argument('--num-instances', type=int, default=4,
help="each minibatch consist of "
"(batch_size // num_instances) identities, and "
"each identity has num_instances instances, "
"default: 0 (NOT USE)")
# model
parser.add_argument('-a', '--arch', type=str, default='resnet50',
choices=models_pre_a_s2.names())
parser.add_argument('--features', type=int, default=0)
parser.add_argument('--dropout', type=float, default=0)
# optimizer
parser.add_argument('--lr', type=float, default=0.00035,
help="learning rate of new parameters, for pretrained "
"parameters it is 10 times smaller than this")
parser.add_argument('--momentum', type=float, default=0.9)
parser.add_argument('--alpha', type=float, default=0.999)
parser.add_argument('--moving-avg-momentum', type=float, default=0)
parser.add_argument('--weight-decay', type=float, default=5e-4)
parser.add_argument('--soft-ce-weight', type=float, default=0.5)
parser.add_argument('--soft-tri-weight', type=float, default=0.8)
parser.add_argument('--epochs', type=int, default=40)
parser.add_argument('--iters', type=int, default=800)
# training configs
parser.add_argument('--init-1', type=str, default='', metavar='PATH')
parser.add_argument('--init-2', type=str, default='', metavar='PATH')
parser.add_argument('--seed', type=int, default=1)
parser.add_argument('--print-freq', type=int, default=1)
parser.add_argument('--eval-step', type=int, default=1)
# path
working_dir = osp.dirname(osp.abspath(__file__))
parser.add_argument('--data-dir', type=str, metavar='PATH',
default=osp.join(working_dir, 'data'))
parser.add_argument('--logs-dir', type=str, metavar='PATH',
default=osp.join(working_dir, 'logs'))
main()