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test.py
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test.py
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from __future__ import print_function
import os
import sys
import argparse
cur_path = os.path.abspath(os.path.dirname(__file__))
root_path = os.path.split(cur_path)[0]
sys.path.append(root_path)
import torch
import torch.nn as nn
import torch.nn.functional as F
import torch.utils.data as data
import torch.backends.cudnn as cudnn
import torch.distributed as dist
from PIL import Image as PILImage
import numpy as np
from models.model_zoo import get_segmentation_model
from utils.score import SegmentationMetric
from utils.logger import setup_logger
from utils.distributed import synchronize, get_rank, make_data_sampler, make_batch_data_sampler
from dataset.cityscapes import CSTestSet
def parse_args():
parser = argparse.ArgumentParser(description='Semantic Segmentation Test With Pytorch')
# model and dataset
parser.add_argument('--model', type=str, default='deeplabv3',
help='model name')
parser.add_argument('--method', type=str, default='kd',
help='method name')
parser.add_argument('--backbone', type=str, default='resnet18',
help='backbone name')
parser.add_argument('--dataset', type=str, default='citys',
help='dataset name')
parser.add_argument('--data', type=str, default='./dataset/cityscapes/',
help='dataset directory')
parser.add_argument('--data-list', type=str, default='./dataset/list/cityscapes/test.lst',
help='dataset directory')
parser.add_argument('--workers', '-j', type=int, default=8,
metavar='N', help='dataloader threads')
# training hyper params
parser.add_argument('--aux', action='store_true', default=False,
help='Auxiliary loss')
# cuda setting
parser.add_argument('--no-cuda', action='store_true', default=False,
help='disables CUDA training')
parser.add_argument('--local_rank', type=int, default=0)
# checkpoint and log
parser.add_argument('--pretrained', type=str, default='psp_resnet18_citys_best_model.pth',
help='pretrained seg model')
parser.add_argument('--save-dir', default='../runs/logs/',
help='Directory for saving predictions')
parser.add_argument('--save-pred', action='store_true', default=False,
help='save predictions')
# validation
parser.add_argument('--flip-eval', action='store_true', default=False,
help='flip_evaluation')
parser.add_argument('--scales', default=[1.], type=float, nargs='+', help='multiple scales')
args = parser.parse_args()
if args.backbone.startswith('resnet'):
args.aux = True
elif args.backbone.startswith('mobile'):
args.aux = False
else:
raise ValueError('no such network')
return args
class Evaluator(object):
def __init__(self, args, num_gpus):
self.args = args
self.num_gpus = num_gpus
self.device = torch.device(args.device)
ignore_label = -1
self.id_to_trainid = {-1: ignore_label, 0: ignore_label, 1: ignore_label, 2: ignore_label,
3: ignore_label, 4: ignore_label, 5: ignore_label, 6: ignore_label,
7: 0, 8: 1, 9: ignore_label, 10: ignore_label, 11: 2, 12: 3, 13: 4,
14: ignore_label, 15: ignore_label, 16: ignore_label, 17: 5,
18: ignore_label, 19: 6, 20: 7, 21: 8, 22: 9, 23: 10, 24: 11, 25: 12, 26: 13, 27: 14,
28: 15, 29: ignore_label, 30: ignore_label, 31: 16, 32: 17, 33: 18}
# dataset and dataloader
self.val_dataset = CSTestSet(args.data, args.data_list)
val_sampler = make_data_sampler(self.val_dataset, False, args.distributed)
val_batch_sampler = make_batch_data_sampler(val_sampler, images_per_batch=1)
self.val_loader = data.DataLoader(dataset=self.val_dataset,
batch_sampler=val_batch_sampler,
num_workers=args.workers,
pin_memory=True)
# create network
BatchNorm2d = nn.SyncBatchNorm if args.distributed else nn.BatchNorm2d
self.model = get_segmentation_model(model=args.model,
backbone=args.backbone,
aux=args.aux,
pretrained=args.pretrained,
pretrained_base='None',
local_rank=args.local_rank,
norm_layer=BatchNorm2d).to(self.device)
if args.distributed:
self.model = nn.parallel.DistributedDataParallel(self.model,
device_ids=[args.local_rank], output_device=args.local_rank)
self.model.to(self.device)
self.metric = SegmentationMetric(self.val_dataset.num_class)
def id2trainId(self, label, id_to_trainid, reverse=False):
label_copy = label.copy()
if reverse:
for v, k in id_to_trainid.items():
label_copy[label == k] = v
else:
for k, v in id_to_trainid.items():
label_copy[label == k] = v
return label_copy
def reduce_tensor(self, tensor):
rt = tensor.clone()
dist.all_reduce(rt, op=dist.ReduceOp.SUM)
return rt
def predict_whole(self, net, image, tile_size):
interp = nn.Upsample(size=tile_size, mode='bilinear', align_corners=True)
prediction = net(image.cuda())
if isinstance(prediction, tuple) or isinstance(prediction, list):
prediction = prediction[0]
prediction = interp(prediction)
return prediction
def eval(self):
self.metric.reset()
self.model.eval()
if self.args.distributed:
model = self.model.module
else:
model = self.model
logger.info("Start validation, Total sample: {:d}".format(len(self.val_loader)))
for i, (image, target, filename) in enumerate(self.val_loader):
image = image.to(self.device)
target = target.to(self.device)
N_, C_, H_, W_ = image.size()
tile_size = (H_, W_)
full_probs = torch.zeros((1, self.val_dataset.num_class, H_, W_)).cuda()
scales = args.scales
with torch.no_grad():
for scale in scales:
scale = float(scale)
print("Predicting image scaled by %f" % scale)
scale_image = F.interpolate(image, scale_factor=scale, mode='bilinear', align_corners=True)
scaled_probs = self.predict_whole(model, scale_image, tile_size)
if args.flip_eval:
print("flip evaluation")
flip_scaled_probs = self.predict_whole(model, torch.flip(scale_image, dims=[3]), tile_size)
scaled_probs = 0.5 * (scaled_probs + torch.flip(flip_scaled_probs, dims=[3]))
full_probs += scaled_probs
full_probs /= len(scales)
if self.args.save_pred:
pred = torch.argmax(full_probs, 1)
pred = pred.cpu().data.numpy()
seg_pred = self.id2trainId(pred, self.id_to_trainid, reverse=True)
predict = seg_pred.squeeze(0)
# mask = get_color_pallete(predict, self.args.dataset)
mask = PILImage.fromarray(predict.astype('uint8'))
mask.save(os.path.join(args.outdir, os.path.splitext(filename[0])[0] + '.png'))
print('Save mask to ' + os.path.splitext(filename[0])[0] + '.png' + ' Successfully!')
synchronize()
if __name__ == '__main__':
args = parse_args()
num_gpus = int(os.environ["WORLD_SIZE"]) if "WORLD_SIZE" in os.environ else 1
args.distributed = num_gpus > 1
if not args.no_cuda and torch.cuda.is_available():
cudnn.benchmark = True
args.device = "cuda"
else:
args.distributed = False
args.device = "cpu"
if args.distributed:
torch.cuda.set_device(args.local_rank)
torch.distributed.init_process_group(backend="nccl", init_method="env://")
synchronize()
# TODO: optim code
outdir = '{}_{}_{}_{}'.format(args.model, args.backbone, args.dataset, args.method)
args.outdir = os.path.join(args.save_dir, outdir)
if args.save_pred:
if (args.distributed and args.local_rank == 0) or args.distributed is False:
if not os.path.exists(args.outdir):
os.makedirs(args.outdir)
logger = setup_logger("semantic_segmentation", args.save_dir, get_rank(),
filename='{}_{}_{}_log.txt'.format(args.model, args.backbone, args.dataset), mode='a+')
evaluator = Evaluator(args, num_gpus)
evaluator.eval()
torch.cuda.empty_cache()