test_train.py

# -*- coding: utf-8 -*-

from __future__ import print_function, division

import argparse
import torch
import torch.nn as nn
import torch.optim as optim
from torch.optim import lr_scheduler
from torch.autograd import Variable
import torch.backends.cudnn as cudnn
import numpy as np
import torchvision
from torchvision import datasets, models, transforms
import time
import os
import scipy.io
import yaml
import math
from model import ft_net, two_view_net, three_view_net
from utils import load_network

#fp16
try:
    from apex.fp16_utils import *
except ImportError: # will be 3.x series
    print('This is not an error. If you want to use low precision, i.e., fp16, please install the apex with cuda support (https://github.com/NVIDIA/apex) and update pytorch to 1.0')
######################################################################
# Options
# --------

parser = argparse.ArgumentParser(description='Training')
parser.add_argument('--gpu_ids',default='0', type=str,help='gpu_ids: e.g. 0  0,1,2  0,2')
parser.add_argument('--which_epoch',default='last', type=str, help='0,1,2,3...or last')
parser.add_argument('--test_dir',default='./data/train',type=str, help='./test_data')
parser.add_argument('--name', default='two_view', type=str, help='save model path')
parser.add_argument('--pool', default='avg', type=str, help='avg|max')
parser.add_argument('--batchsize', default=256, type=int, help='batchsize')
parser.add_argument('--h', default=256, type=int, help='height')
parser.add_argument('--w', default=256, type=int, help='width')
parser.add_argument('--views', default=2, type=int, help='views')
parser.add_argument('--use_dense', action='store_true', help='use densenet121' )
parser.add_argument('--PCB', action='store_true', help='use PCB' )
parser.add_argument('--multi', action='store_true', help='use multiple query' )
parser.add_argument('--fp16', action='store_true', help='use fp16.' )
parser.add_argument('--ms',default='1', type=str,help='multiple_scale: e.g. 1 1,1.1  1,1.1,1.2')

opt = parser.parse_args()
###load config###
# load the training config
config_path = os.path.join('./model',opt.name,'opts.yaml')
with open(config_path, 'r') as stream:
        config = yaml.load(stream, Loader=yaml.FullLoader)
opt.fp16 = config['fp16'] 
opt.use_dense = config['use_dense']
opt.use_NAS = config['use_NAS']
opt.stride = config['stride']
opt.views = config['views']

if 'h' in config:
    opt.h = config['h']
    opt.w = config['w']

if 'nclasses' in config: # tp compatible with old config files
    opt.nclasses = config['nclasses']
else: 
    opt.nclasses = 729 

str_ids = opt.gpu_ids.split(',')
#which_epoch = opt.which_epoch
name = opt.name
test_dir = opt.test_dir

gpu_ids = []
for str_id in str_ids:
    id = int(str_id)
    if id >=0:
        gpu_ids.append(id)

print('We use the scale: %s'%opt.ms)
str_ms = opt.ms.split(',')
ms = []
for s in str_ms:
    s_f = float(s)
    ms.append(math.sqrt(s_f))

# set gpu ids
if len(gpu_ids)>0:
    torch.cuda.set_device(gpu_ids[0])
    cudnn.benchmark = True

######################################################################
# Load Data
# ---------
#
# We will use torchvision and torch.utils.data packages for loading the
# data.
#
data_transforms = transforms.Compose([
        transforms.Resize((opt.h, opt.w), interpolation=3),
        transforms.ToTensor(),
        transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225])
])

if opt.PCB:
    data_transforms = transforms.Compose([
        transforms.Resize((384,192), interpolation=3),
        transforms.ToTensor(),
        transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225]) 
    ])


data_dir = test_dir

if opt.multi:
    image_datasets = {x: datasets.ImageFolder( os.path.join(data_dir,x) ,data_transforms) for x in ['gallery','query','multi-query']}
    dataloaders = {x: torch.utils.data.DataLoader(image_datasets[x], batch_size=opt.batchsize,
                                             shuffle=False, num_workers=16) for x in ['gallery','query','multi-query']}
else:
    image_datasets = {x: datasets.ImageFolder( os.path.join(data_dir,x) ,data_transforms) for x in ['satellite','street', 'drone']}
    dataloaders = {x: torch.utils.data.DataLoader(image_datasets[x], batch_size=opt.batchsize,
                                             shuffle=False, num_workers=16) for x in ['satellite', 'street', 'drone']}
use_gpu = torch.cuda.is_available()

######################################################################
# Extract feature
# ----------------------
#
# Extract feature from  a trained model.
#
def fliplr(img):
    '''flip horizontal'''
    inv_idx = torch.arange(img.size(3)-1,-1,-1).long()  # N x C x H x W
    img_flip = img.index_select(3,inv_idx)
    return img_flip

def which_view(name):
    if 'satellite' in name:
        return 1
    elif 'street' in name:
        return 2
    elif 'drone' in name:
        return 3
    else:
        print('unknown view')
    return -1

def extract_feature(model,dataloaders, view_index = 1):
    features = torch.FloatTensor()
    count = 0
    for data in dataloaders:
        img, label = data
        n, c, h, w = img.size()
        count += n
        print(count)
        ff = torch.FloatTensor(n,512).zero_().cuda()

        for i in range(2):
            if(i==1):
                img = fliplr(img)
            input_img = Variable(img.cuda())
            for scale in ms:
                if scale != 1:
                    # bicubic is only  available in pytorch>= 1.1
                    input_img = nn.functional.interpolate(input_img, scale_factor=scale, mode='bilinear', align_corners=False)
                if opt.views ==2:
                    if view_index == 1:
                        outputs, _ = model(input_img, None) 
                    elif view_index ==2:
                        _, outputs = model(None, input_img) 
                elif opt.views ==3:
                    if view_index == 1:
                        outputs, _, _ = model(input_img, None, None)
                    elif view_index ==2:
                        _, outputs, _ = model(None, input_img, None)
                    elif view_index ==3:
                        _, _, outputs = model(None, None, input_img)
                ff += outputs
        # norm feature
        if opt.PCB:
            # feature size (n,2048,6)
            # 1. To treat every part equally, I calculate the norm for every 2048-dim part feature.
            # 2. To keep the cosine score==1, sqrt(6) is added to norm the whole feature (2048*6).
            fnorm = torch.norm(ff, p=2, dim=1, keepdim=True) * np.sqrt(6) 
            ff = ff.div(fnorm.expand_as(ff))
            ff = ff.view(ff.size(0), -1)
        else:
            fnorm = torch.norm(ff, p=2, dim=1, keepdim=True)
            ff = ff.div(fnorm.expand_as(ff))

        features = torch.cat((features,ff.data.cpu()), 0)
    return features

def get_id(img_path):
    camera_id = []
    labels = []
    for path, v in img_path:
        folder_name = os.path.basename(os.path.dirname(path))
        labels.append(int(folder_name))
    return labels

######################################################################
# Load Collected data Trained model
print('-------test-----------')

model, _, epoch = load_network(opt.name, opt)
model.classifier.classifier = nn.Sequential()
model = model.eval()
if use_gpu:
    model = model.cuda()

# Extract feature
since = time.time()

gallery_name = 'street' #'gallery_satellite'
query_name = 'satellite' #'query_street'
which_gallery = which_view(gallery_name)
which_query = which_view(query_name)
print('%d -> %d:'%(which_query, which_gallery))

gallery_path = image_datasets[gallery_name].imgs
query_path = image_datasets[query_name].imgs
gallery_label = get_id(gallery_path)
query_label = get_id(query_path)

with torch.no_grad():
    query_feature = extract_feature(model,dataloaders[query_name], which_query)
    gallery_feature = extract_feature(model,dataloaders[gallery_name], which_gallery)

time_elapsed = time.time() - since
print('Test complete in {:.0f}m {:.0f}s'.format(
        time_elapsed // 60, time_elapsed % 60))

# Save to Matlab for check
result = {'gallery_f':gallery_feature.numpy(),'gallery_label':gallery_label,'query_f':query_feature.numpy(),'query_label':query_label}
scipy.io.savemat('pytorch_result.mat',result)

print(opt.name)
result = './model/%s/result.txt'%opt.name
os.system('python evaluate_gpu.py | tee -a %s'%result)