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train.py
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train.py
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import os
import torch
import datetime
from darknet import Darknet19
from datasets.pascal_voc import VOCDataset
import utils.yolo as yolo_utils
import utils.network as net_utils
from utils.timer import Timer
import cfgs.config as cfg
from random import randint
try:
from tensorboardX import SummaryWriter
except ImportError:
SummaryWriter = None
# data loader
imdb = VOCDataset(cfg.imdb_train, cfg.DATA_DIR, cfg.train_batch_size,
yolo_utils.preprocess_train, processes=2, shuffle=True,
dst_size=cfg.multi_scale_inp_size)
# dst_size=cfg.inp_size)
print('load data succ...')
net = Darknet19()
# net_utils.load_net(cfg.trained_model, net)
# pretrained_model = os.path.join(cfg.train_output_dir,
# 'darknet19_voc07trainval_exp1_63.h5')
# pretrained_model = cfg.trained_model
# net_utils.load_net(pretrained_model, net)
net.load_from_npz(cfg.pretrained_model, num_conv=18)
net.cuda()
net.train()
print('load net succ...')
# optimizer
start_epoch = 0
lr = cfg.init_learning_rate
optimizer = torch.optim.SGD(net.parameters(), lr=lr, momentum=cfg.momentum,
weight_decay=cfg.weight_decay)
# tensorboad
use_tensorboard = cfg.use_tensorboard and SummaryWriter is not None
# use_tensorboard = False
if use_tensorboard:
summary_writer = SummaryWriter(os.path.join(cfg.TRAIN_DIR, 'runs', cfg.exp_name))
else:
summary_writer = None
batch_per_epoch = imdb.batch_per_epoch
train_loss = 0
bbox_loss, iou_loss, cls_loss = 0., 0., 0.
cnt = 0
t = Timer()
step_cnt = 0
size_index = 0
for step in range(start_epoch * imdb.batch_per_epoch,
cfg.max_epoch * imdb.batch_per_epoch):
t.tic()
# batch
batch = imdb.next_batch(size_index)
im = batch['images']
gt_boxes = batch['gt_boxes']
gt_classes = batch['gt_classes']
dontcare = batch['dontcare']
orgin_im = batch['origin_im']
# forward
im_data = net_utils.np_to_variable(im,
is_cuda=True,
volatile=False).permute(0, 3, 1, 2)
bbox_pred, iou_pred, prob_pred = net(im_data, gt_boxes, gt_classes, dontcare, size_index)
# backward
loss = net.loss
bbox_loss += net.bbox_loss.data.cpu().numpy()[0]
iou_loss += net.iou_loss.data.cpu().numpy()[0]
cls_loss += net.cls_loss.data.cpu().numpy()[0]
train_loss += loss.data.cpu().numpy()[0]
optimizer.zero_grad()
loss.backward()
optimizer.step()
cnt += 1
step_cnt += 1
duration = t.toc()
if step % cfg.disp_interval == 0:
train_loss /= cnt
bbox_loss /= cnt
iou_loss /= cnt
cls_loss /= cnt
print(('epoch %d[%d/%d], loss: %.3f, bbox_loss: %.3f, iou_loss: %.3f, '
'cls_loss: %.3f (%.2f s/batch, rest:%s)' %
(imdb.epoch, step_cnt, batch_per_epoch, train_loss, bbox_loss,
iou_loss, cls_loss, duration,
str(datetime.timedelta(seconds=int((batch_per_epoch - step_cnt) * duration)))))) # noqa
if summary_writer and step % cfg.log_interval == 0:
summary_writer.add_scalar('loss_train', train_loss, step)
summary_writer.add_scalar('loss_bbox', bbox_loss, step)
summary_writer.add_scalar('loss_iou', iou_loss, step)
summary_writer.add_scalar('loss_cls', cls_loss, step)
summary_writer.add_scalar('learning_rate', lr, step)
# plot results
bbox_pred = bbox_pred.data[0:1].cpu().numpy()
iou_pred = iou_pred.data[0:1].cpu().numpy()
prob_pred = prob_pred.data[0:1].cpu().numpy()
image = im[0]
bboxes, scores, cls_inds = yolo_utils.postprocess(
bbox_pred, iou_pred, prob_pred, image.shape, cfg, thresh=0.3, size_index=size_index)
im2show = yolo_utils.draw_detection(image, bboxes, scores, cls_inds, cfg)
summary_writer.add_image('predict', im2show, step)
train_loss = 0
bbox_loss, iou_loss, cls_loss = 0., 0., 0.
cnt = 0
t.clear()
size_index = randint(0, len(cfg.multi_scale_inp_size) - 1)
print("image_size {}".format(cfg.multi_scale_inp_size[size_index]))
if step > 0 and (step % imdb.batch_per_epoch == 0):
if imdb.epoch in cfg.lr_decay_epochs:
lr *= cfg.lr_decay
optimizer = torch.optim.SGD(net.parameters(), lr=lr,
momentum=cfg.momentum,
weight_decay=cfg.weight_decay)
save_name = os.path.join(cfg.train_output_dir,
'{}_{}.h5'.format(cfg.exp_name, imdb.epoch))
net_utils.save_net(save_name, net)
print(('save model: {}'.format(save_name)))
step_cnt = 0
imdb.close()