def _change_backend(backend):
if backend not in image_utils.get_available_backends():
pytest.skip("{} is not installed".format(backend))
# change backend arbitrary
image_utils.set_backend(backend)
assert image_utils.get_backend() == backend
def train(args):
# create real images
reals = create_real_images(args)
# save real images
for i, real in enumerate(reals):
image_path = os.path.join(args.logdir, 'real_%d.png' % i)
imwrite(denormalize(np.transpose(real, [0, 2, 3, 1])[0]), image_path)
# nnabla monitor
monitor = Monitor(args.logdir)
# use cv2 backend at MonitorImage
set_backend('cv2')
prev_models = []
Zs = []
noise_amps = []
for scale_num in range(len(reals)):
fs = min(args.fs_init * (2**(scale_num // 4)), 128)
min_fs = min(args.min_fs_init * (2**(scale_num // 4)), 128)
model = Model(real=reals[scale_num],
num_layer=args.num_layer,
fs=fs,
min_fs=min_fs,
kernel=args.kernel,
pad=args.pad,
lam_grad=args.lam_grad,
alpha_recon=args.alpha_recon,
d_lr=args.d_lr,
g_lr=args.g_lr,
beta1=args.beta1,
gamma=args.gamma,
lr_milestone=args.lr_milestone,
scope=str(scale_num))
z_curr = train_single_scale(args, scale_num, model, reals, prev_models,
Zs, noise_amps, monitor)
prev_models.append(model)
Zs.append(z_curr)
noise_amps.append(args.noise_amp)
# save data
nn.save_parameters(os.path.join(args.logdir, 'models.h5'))
save_pkl(Zs, os.path.join(args.logdir, 'Zs.pkl'))
save_pkl(reals, os.path.join(args.logdir, 'reals.pkl'))
save_pkl(noise_amps, os.path.join(args.logdir, 'noise_amps.pkl'))
return Zs, reals, noise_amps
def load_image_dcm(file, shape=None, normalize=False):
if normalize:
max_range = 1.0
else:
max_range = -1
img = None
try:
if 'dicom' not in image_utils.get_available_backends():
raise ValueError("Please ensure cv2 and dicom is installed.")
current_backend = image_utils.get_backend()
image_utils.set_backend('dicom')
img = load_image_imread(file, shape, max_range)
return img
finally:
image_utils.set_backend(current_backend)
return img
def test_image_utils_backend_manager():
with pytest.raises(ValueError):
image_utils.set_backend("not_installed_module")