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train.py
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"""
training code
also contains the F-score evaluation code.
"""
from __future__ import absolute_import
from __future__ import division
import argparse
import logging
import os
import numpy as np
import torch
from apex import amp
from config import cfg, assert_and_infer_cfg
from utils.misc import AverageMeter, prep_experiment, evaluate_eval, fast_hist, set_bn_eval
from utils.f_boundary import eval_mask_boundary
import datasets
import loss
import network
import optimizer
import warnings
warnings.filterwarnings('ignore')
logging.getLogger().setLevel(logging.INFO)
# Argument Parser
parser = argparse.ArgumentParser(description='Semantic Segmentation')
parser.add_argument('--lr', type=float, default=0.002)
parser.add_argument('--arch', type=str, default='network.deepv3.DeepWV3Plus',
help='Network architecture. We have DeepSRNX50V3PlusD (backbone: ResNeXt50) \
and deepWV3Plus (backbone: WideResNet38).')
parser.add_argument('--dataset', type=str, default='cityscapes',
help='cityscapes, mapillary, camvid, kitti')
parser.add_argument('--cv', type=int, default=None,
help='cross-validation split id to use. Default # of splits set to 3 in config')
parser.add_argument('--mode', type=str, default="train",
help='dataset splits to be used')
parser.add_argument('--class_uniform_pct', type=float, default=0.5,
help='What fraction of images is uniformly sampled')
parser.add_argument('--class_uniform_tile', type=int, default=1024,
help='tile size for class uniform sampling')
parser.add_argument('--coarse_boost_classes', type=str, default=None,
help='use coarse annotations to boost fine data with specific classes')
parser.add_argument('--img_wt_loss', action='store_true', default=False,
help='per-image class-weighted loss')
parser.add_argument('--batch_weighting', action='store_true', default=False,
help='Batch weighting for class (use nll class weighting using batch stats')
parser.add_argument('--icnet_loss', action='store_true', default=False,
help='multiple icnet loss')
parser.add_argument('--fpn_dsn_loss', action='store_true', default=False,
help='multiple sfnet loss')
parser.add_argument("--ohem", action="store_true", default=False, help="start OHEM loss")
parser.add_argument("--aux", action="store_true", default=False, help="whether use Aux loss")
parser.add_argument('--jointwtborder', action='store_true', default=False,
help='Enable boundary label relaxation')
parser.add_argument('--joint_edgeseg_loss', action='store_true', default=False, help="whether use the edge loss")
parser.add_argument('--edge_weight', type=float, default=1.0,
help='Edge loss weight for joint loss')
parser.add_argument('--seg_weight', type=float, default=1.0,
help='Segmentation loss weight for joint loss')
parser.add_argument('--att_weight', type=float, default=1.0,
help='Attention loss weight for joint loss')
parser.add_argument('--strict_bdr_cls', type=str, default='',
help='Enable boundary label relaxation for specific classes')
parser.add_argument('--rlx_off_epoch', type=int, default=-1,
help='Turn off border relaxation after specific epoch count')
parser.add_argument('--rescale', type=float, default=1.0,
help='Warm Restarts new learning rate ratio compared to original lr')
parser.add_argument('--repoly', type=float, default=1.5,
help='Warm Restart new poly exp')
parser.add_argument('--apex', action='store_true', default=False,
help='Use Nvidia Apex Distributed Data Parallel')
parser.add_argument('--fp16', action='store_true', default=False,
help='Use Nvidia Apex AMP')
parser.add_argument('--local_rank', default=0, type=int,
help='parameter used by apex library')
parser.add_argument('--sgd', action='store_true', default=True)
parser.add_argument('--adam', action='store_true', default=False)
parser.add_argument('--amsgrad', action='store_true', default=False)
parser.add_argument('--freeze_trunk', action='store_true', default=False)
parser.add_argument('--hardnm', default=0, type=int,
help='0 means no aug, 1 means hard negative mining iter 1,' +
'2 means hard negative mining iter 2')
parser.add_argument('--trunk', type=str, default='resnet101',
help='trunk model, can be: resnet101 (default), resnet50')
parser.add_argument('--max_epoch', type=int, default=180)
parser.add_argument('--eval_epoch', type=int, default=150, help="start evaluation epoch")
parser.add_argument('--max_cu_epoch', type=int, default=100000,
help='Class Uniform Max Epochs')
parser.add_argument('--start_epoch', type=int, default=0)
parser.add_argument('--color_aug', type=float,
default=0.25, help='level of color augmentation')
parser.add_argument('--gblur', action='store_true', default=True,
help='Use Guassian Blur Augmentation')
parser.add_argument('--bblur', action='store_true', default=False,
help='Use Bilateral Blur Augmentation')
parser.add_argument('--lr_schedule', type=str, default='poly',
help='name of lr schedule: poly')
parser.add_argument('--poly_exp', type=float, default=1.0,
help='polynomial LR exponent')
parser.add_argument('--bs_mult', type=int, default=2,
help='Batch size for training per gpu')
parser.add_argument('--bs_mult_val', type=int, default=1,
help='Batch size for Validation per gpu')
parser.add_argument('--crop_size', type=int, default=720,
help='training crop size')
parser.add_argument('--pre_size', type=int, default=None,
help='resize image shorter edge to this before augmentation')
parser.add_argument('--scale_min', type=float, default=0.5,
help='dynamically scale training images down to this size')
parser.add_argument('--scale_max', type=float, default=2.0,
help='dynamically scale training images up to this size')
parser.add_argument('--weight_decay', type=float, default=1e-4)
parser.add_argument('--momentum', type=float, default=0.9)
parser.add_argument('--snapshot', type=str, default=None)
parser.add_argument('--restore_optimizer', action='store_true', default=False)
parser.add_argument('--exp', type=str, default='default',
help='experiment directory name')
parser.add_argument('--tb_tag', type=str, default='',
help='add tag to tb dir')
parser.add_argument('--ckpt', type=str, default='logs/ckpt',
help='Save Checkpoint Point')
parser.add_argument('--tb_path', type=str, default='logs/tb',
help='Save Tensorboard Path')
parser.add_argument('--syncbn', action='store_true', default=False,
help='Use Synchronized BN')
parser.add_argument('--fix_bn', action='store_true', default=False,
help=" whether to fix bn for improving the performance")
parser.add_argument('--evaluateF', action='store_true', default=False,
help="whether to evaluate the F score")
parser.add_argument('--eval_thresholds', type=str, default='0.0005,0.001875,0.00375,0.005',
help='Thresholds for boundary evaluation')
parser.add_argument('--dump_augmentation_images', action='store_true', default=False,
help='Dump Augmentated Images for sanity check')
parser.add_argument('--test_mode', action='store_true', default=False,
help='Minimum testing to verify nothing failed, ' +
'Runs code for 1 epoch of train and val')
parser.add_argument('-wb', '--wt_bound', type=float, default=1.0,
help='Weight Scaling for the losses')
parser.add_argument('--maxSkip', type=int, default=0,
help='Skip x number of frames of video augmented dataset')
parser.add_argument('--scf', action='store_true', default=False,
help='scale correction factor')
args = parser.parse_args()
args.best_record = {'epoch': -1, 'iter': 0, 'val_loss': 1e10, 'acc': 0,
'acc_cls': 0, 'mean_iu': 0, 'fwavacc': 0}
# Enable CUDNN Benchmarking optimization
torch.backends.cudnn.benchmark = True
args.world_size = 1
# Test Mode run two epochs with a few iterations of training and val
if args.test_mode:
args.max_epoch = 2
if 'WORLD_SIZE' in os.environ and args.apex:
args.apex = int(os.environ['WORLD_SIZE']) > 1
args.world_size = int(os.environ['WORLD_SIZE'])
print("Total world size: ", int(os.environ['WORLD_SIZE']))
if args.apex:
# Check that we are running with cuda as distributed is only supported for cuda.
torch.cuda.set_device(args.local_rank)
print('My Rank:', args.local_rank)
# Initialize distributed communication
torch.distributed.init_process_group(backend='nccl',
init_method='env://')
def main():
"""
Main Function
"""
# Set up the Arguments, Tensorboard Writer, Dataloader, Loss Fn, Optimizer
assert_and_infer_cfg(args)
writer = prep_experiment(args, parser)
train_loader, val_loader, train_obj = datasets.setup_loaders(args)
criterion, criterion_val = loss.get_loss(args)
net = network.get_net(args, criterion)
optim, scheduler = optimizer.get_optimizer(args, net)
if args.fix_bn:
net.apply(set_bn_eval)
print("Fix bn for finetuning")
if args.fp16:
net, optim = amp.initialize(net, optim, opt_level="O1")
net = network.wrap_network_in_dataparallel(net, args.apex)
if args.snapshot:
optimizer.load_weights(net, optim,
args.snapshot, args.restore_optimizer)
if args.evaluateF:
assert args.snapshot is not None, "must load weights for evaluation"
evaluate(val_loader, net, args)
return
torch.cuda.empty_cache()
# Main Loop
for epoch in range(args.start_epoch, args.max_epoch):
# Update EPOCH CTR
cfg.immutable(False)
cfg.EPOCH = epoch
cfg.immutable(True)
scheduler.step()
train(train_loader, net, optim, epoch, writer)
if args.apex:
train_loader.sampler.set_epoch(epoch + 1)
validate(val_loader, net, criterion_val,
optim, epoch, writer)
if args.class_uniform_pct:
if epoch >= args.max_cu_epoch:
train_obj.build_epoch(cut=True)
if args.apex:
train_loader.sampler.set_num_samples()
else:
train_obj.build_epoch()
def train(train_loader, net, optim, curr_epoch, writer):
"""
Runs the training loop per epoch
train_loader: Data loader for train
net: thet network
optimizer: optimizer
curr_epoch: current epoch
writer: tensorboard writer
return:
"""
net.train()
train_main_loss = AverageMeter()
curr_iter = curr_epoch * len(train_loader)
for i, data in enumerate(train_loader):
edges = None
if args.joint_edgeseg_loss:
inputs, gts, edges, _img_name = data
else:
inputs, gts, _img_name = data
batch_pixel_size = inputs.size(0) * inputs.size(2) * inputs.size(3)
inputs, gts = inputs.cuda(), gts.cuda()
optim.zero_grad()
if args.joint_edgeseg_loss:
main_loss_dic = net(inputs, gts=(gts, edges))
main_loss = main_loss_dic['seg_loss']
main_loss += main_loss_dic['seg_body']
main_loss += main_loss_dic['edge_loss']
main_loss += main_loss_dic['edge_ohem_loss']
else:
main_loss = net(inputs, gts=gts)
if args.apex:
log_main_loss = main_loss.clone().detach_()
torch.distributed.all_reduce(log_main_loss, torch.distributed.ReduceOp.SUM)
log_main_loss = log_main_loss / args.world_size
else:
main_loss = main_loss.mean()
log_main_loss = main_loss.clone().detach_()
train_main_loss.update(log_main_loss.item(), batch_pixel_size)
if args.fp16:
with amp.scale_loss(main_loss, optim) as scaled_loss:
scaled_loss.backward()
else:
main_loss.backward()
optim.step()
curr_iter += 1
if args.local_rank == 0:
msg = '[epoch {}], [iter {} / {}], [train main loss {:0.6f}], [lr {:0.6f}]'.format(
curr_epoch, i + 1, len(train_loader), train_main_loss.avg,
optim.param_groups[-1]['lr'])
logging.info(msg)
if i > 5 and args.test_mode:
return
def validate(val_loader, net, criterion, optim, curr_epoch, writer):
"""
Runs the validation loop after each training epoch
val_loader: Data loader for validation
net: thet network
criterion: loss fn
optimizer: optimizer
curr_epoch: current epoch
writer: tensorboard writer
return: val_avg for step function if required
"""
net.eval()
val_loss = AverageMeter()
iou_acc = 0
dump_images = []
for val_idx, data in enumerate(val_loader):
inputs, gt_image, img_names = data
assert len(inputs.size()) == 4 and len(gt_image.size()) == 3
assert inputs.size()[2:] == gt_image.size()[1:]
batch_pixel_size = inputs.size(0) * inputs.size(2) * inputs.size(3)
inputs, gt_cuda = inputs.cuda(), gt_image.cuda()
with torch.no_grad():
output = net(inputs) # output = (1, 19, 713, 713)
assert output.size()[2:] == gt_image.size()[1:]
assert output.size()[1] == args.dataset_cls.num_classes
val_loss.update(criterion(output, gt_cuda).item(), batch_pixel_size)
predictions = output.data.max(1)[1].cpu()
# Logging
if val_idx % 20 == 0:
if args.local_rank == 0:
print("validating: {} / {}".format(val_idx + 1, len(val_loader)))
if val_idx > 10 and args.test_mode:
break
# Image Dumps
if val_idx < 10:
dump_images.append([gt_image, predictions, img_names])
iou_acc += fast_hist(predictions.numpy().flatten(), gt_image.numpy().flatten(),
args.dataset_cls.num_classes)
del output, val_idx, data
if args.apex:
iou_acc_tensor = torch.cuda.FloatTensor(iou_acc)
torch.distributed.all_reduce(iou_acc_tensor, op=torch.distributed.ReduceOp.SUM)
iou_acc = iou_acc_tensor.cpu().numpy()
if args.local_rank == 0:
evaluate_eval(args, net, optim, val_loss, iou_acc, dump_images,
writer, curr_epoch, args.dataset_cls)
return val_loss.avg
def evaluate(val_loader, net, args):
'''
Runs the evaluation loop and prints F score
val_loader: Data loader for validation
net: thet network
return:
'''
net.eval()
for i, thresh in enumerate(args.eval_thresholds.split(',')):
Fpc = np.zeros((args.dataset_cls.num_classes))
Fc = np.zeros((args.dataset_cls.num_classes))
val_loader.sampler.set_epoch( i + 1)
evaluate_F_score(val_loader, net, thresh, Fpc, Fc)
def evaluate_F_score(val_loader, net, thresh, Fpc, Fc):
for vi, data in enumerate(val_loader):
input, mask, img_names = data
assert len(input.size()) == 4 and len(mask.size()) == 3
assert input.size()[2:] == mask.size()[1:]
input, mask_cuda = input.cuda(), mask.cuda()
with torch.no_grad():
seg_out = net(input)
seg_predictions = seg_out.data.max(1)[1].cpu()
logging.info('evaluating: %d / %d' % (vi + 1, len(val_loader)))
_Fpc, _Fc = eval_mask_boundary(seg_predictions.numpy(), mask.numpy(), args.dataset_cls.num_classes,
bound_th=float(thresh))
Fc += _Fc
Fpc += _Fpc
del seg_out, vi, data
if args.apex:
Fc_tensor = torch.cuda.FloatTensor(Fc)
torch.distributed.all_reduce(Fc_tensor, op=torch.distributed.ReduceOp.SUM)
Fc = Fc_tensor.cpu().numpy()
Fpc_tensor = torch.cuda.FloatTensor(Fpc)
torch.distributed.all_reduce(Fpc_tensor, op=torch.distributed.ReduceOp.SUM)
Fpc = Fpc_tensor.cpu().numpy()
if args.local_rank == 0:
print('Threshold: ' + thresh)
print('F_Score: ' + str(np.sum(Fpc / Fc) / args.dataset_cls.num_classes))
print('F_Score (Classwise): ' + str(Fpc / Fc))
return Fpc
if __name__ == '__main__':
main()