def train_loop(batch, crops, ctx_frames, check_code_size):
scheduler.step()
solver.zero_grad()
# Init LSTM states.
(encoder_h_1, encoder_h_2, encoder_h_3, decoder_h_1, decoder_h_2,
decoder_h_3,
decoder_h_4) = init_lstm(batch_size=(crops[0].size(0) * args.num_crops),
height=crops[0].size(2),
width=crops[0].size(3),
args=args)
# Forward U-net.
if args.v_compress:
unet_output1, unet_output2 = forward_ctx(unet, ctx_frames)
else:
unet_output1 = torch.zeros(args.batch_size, ).cuda()
unet_output2 = torch.zeros(args.batch_size, ).cuda()
res, frame1, frame2, warped_unet_output1, warped_unet_output2 = prepare_inputs(
crops, args, unet_output1, unet_output2)
losses = []
# bp_t0 = time.time()
_, _, height, width = res.size()
out_img = torch.zeros(1, 3, height, width).cuda() + 0.5
for _ in range(args.iterations):
if args.v_compress and args.stack:
encoder_input = torch.cat([frame1, res, frame2], dim=1)
else:
encoder_input = res
# Encode.
encoded, encoder_h_1, encoder_h_2, encoder_h_3 = encoder(
encoder_input, encoder_h_1, encoder_h_2, encoder_h_3,
warped_unet_output1, warped_unet_output2)
# Binarize.
codes = binarizer(encoded)
if check_code_size:
print(f"Compressed code size is {codes.shape[1:]}")
check_code_size = False
# Decode.
(output, decoder_h_1, decoder_h_2, decoder_h_3,
decoder_h_4) = decoder(codes, decoder_h_1, decoder_h_2, decoder_h_3,
decoder_h_4, warped_unet_output1,
warped_unet_output2)
res = res - output
out_img = out_img + output.data
losses.append(res.abs().mean())
# bp_t1 = time.time()
loss = sum(losses) / args.iterations
loss.backward()
for net in [encoder, binarizer, decoder, unet]:
if net is not None:
torch.nn.utils.clip_grad_norm(net.parameters(), args.clip)
solver.step()
# batch_t1 = time.time()
# print(
# '[TRAIN] Iter[{}]; LR: {}; Loss: {:.6f}; Backprop: {:.4f} sec; Batch: {:.4f} sec'.
# format(train_iter,
# scheduler.get_lr()[0],
# loss.item(),
# bp_t1 - bp_t0,
# batch_t1 - batch_t0),
# end="\r")
writer.add_scalar("loss", loss.item(), train_iter)
writer.add_scalar("lr", scheduler.get_lr()[0], train_iter)
if train_iter % 100 == 0:
print('Loss at each step:')
print(('{:.4f} ' * args.iterations +
'\n').format(*[l.data.item() for l in losses]))
if train_iter % args.checkpoint_iters == 0:
save(train_iter)
for batch, (crops, ctx_frames, main_fn) in enumerate(train_loader):
scheduler.step()
train_iter += 1
if train_iter > args.max_train_iters:
break
batch_t0 = time.time()
solver.zero_grad()
# Init LSTM states.
(encoder_h_1, encoder_h_2, encoder_h_3, decoder_h_1, decoder_h_2,
decoder_h_3, decoder_h_4) = init_lstm(batch_size=(crops[0].size(0) *
args.num_crops),
height=crops[0].size(2),
width=crops[0].size(3),
args=args)
# Forward U-net.
#if args.v_compress:
#unet_output1, unet_output2 = forward_ctx(unet, ctx_frames)
#else:
#unet_output1 = Variable(torch.zeros(args.batch_size,)).cuda()
#unet_output2 = Variable(torch.zeros(args.batch_size,)).cuda()
res, frame1, frame2, _, _ = prepare_inputs(
crops, args) #, unet_output1, unet_output2)
# UNet.
#enc_unet_output1 = warped_unet_output.numpy()
def train():
"""Code for training
"""
# Using the original argument parser
args = parser.parse_args()
print(args)
# Load training data
train_loader = get_loader(is_train=True,
root=args.train,
mv_dir=args.train_mv,
args=args)
# Load model
nets, solver, milestones, scheduler = load_model(args)
# Check if resume training
train_iter = 0
just_resumed = False
if args.load_model_name:
print('Loading %s@iter %d' % (args.load_model_name, args.load_iter))
nets = resume(args, nets, args.load_iter)
train_iter = args.load_iter
scheduler.last_epoch = train_iter - 1
just_resumed = True
# Start training
while True:
for batch, (crops, ctx_frames, _) in enumerate(train_loader):
scheduler.step()
train_iter += 1
if train_iter > args.max_train_iters:
break
batch_t0 = time.time()
solver.zero_grad()
# Init LSTM states.
(encoder_h_1, encoder_h_2, encoder_h_3, decoder_h_1, decoder_h_2,
decoder_h_3, decoder_h_4) = init_lstm(
batch_size=(crops[0].size(0) * args.num_crops),
height=crops[0].size(2),
width=crops[0].size(3),
args=args)
# Forward U-net.
if len(nets) == 4:
unet = nets[3]
else:
unet = None
if args.v_compress:
unet_output1, unet_output2 = forward_ctx(unet, ctx_frames)
else:
unet_output1 = Variable(torch.zeros(args.batch_size, )).cuda()
unet_output2 = Variable(torch.zeros(args.batch_size, )).cuda()
res, frame1, frame2, warped_unet_output1, warped_unet_output2 = prepare_inputs(
crops, args, unet_output1, unet_output2)
losses = []
bp_t0 = time.time()
_, _, height, width = res.size()
out_img = torch.zeros(1, 3, height, width).cuda() + 0.5
for _ in range(args.iterations):
if args.v_compress and args.stack:
encoder_input = torch.cat([frame1, res, frame2], dim=1)
else:
encoder_input = res
# Encode.
encoder = nets[0]
encoded, encoder_h_1, encoder_h_2, encoder_h_3 = encoder(
encoder_input, encoder_h_1, encoder_h_2, encoder_h_3,
warped_unet_output1, warped_unet_output2)
# Binarize.
binarizer = nets[1]
codes = binarizer(encoded)
# Decode.
decoder = nets[2]
(output, decoder_h_1, decoder_h_2, decoder_h_3,
decoder_h_4) = decoder(codes, decoder_h_1, decoder_h_2,
decoder_h_3, decoder_h_4,
warped_unet_output1,
warped_unet_output2)
# loss function
res = res - output
out_img = out_img + output.data
losses.append(res.abs().mean())
bp_t1 = time.time()
loss = sum(losses) / args.iterations
loss.backward()
for net in [encoder, binarizer, decoder, unet]:
if net is not None:
torch.nn.utils.clip_grad_norm_(net.parameters(), args.clip)
solver.step()
batch_t1 = time.time()
print(
'[TRAIN] Iter[{}]; LR: {}; Loss: {:.6f}; Backprop: {:.4f} sec; Batch: {:.4f} sec'
.format(train_iter,
scheduler.get_lr()[0], loss.item(), bp_t1 - bp_t0,
batch_t1 - batch_t0))
if (train_iter - 1) % 100 == 0:
print('Loss at each step:')
print(('{:.4f} ' * args.iterations +
'\n').format(*[l.data.item() for l in losses]))
if (train_iter - 1) % args.checkpoint_iters == 0:
print("saving model")
save(args, nets, train_iter, encoder)
if train_iter > args.max_train_iters:
print('Training done.')
break