def data_iterator_tiny_digits(digits, batch_size=64, shuffle=False, rng=None):
def load_func(index):
"""Loading an image and its label"""
img = digits.images[index]
label = digits.target[index]
return img[None], np.array([label]).astype(np.int32)
return data_iterator_simple(load_func, digits.target.shape[0], batch_size, shuffle, rng, with_file_cache=False)
def edges2shoes_data_iterator(img_path,
batch_size=1,
normalize_method=lambda x: (x - 127.5) / 127.5,
num_samples=-1):
imgs = glob.glob("{}/*.jpg".format(img_path))
if num_samples == -1:
num_samples = len(imgs)
else:
logger.info(
"Num. of data ({}) is used for debugging".format(num_samples))
def load_func(i):
img = scipy.misc.imread(imgs[i], mode="RGB")
img = normalize_method(img)
h, w, c = img.shape
img_A = img[:, 0:w // 2, :].transpose((2, 0, 1))
img_B = img[:, w // 2:, :].transpose((2, 0, 1))
return img_A, img_B
return data_iterator_simple(load_func,
num_samples,
batch_size,
shuffle=shuffle,
rng=rng,
with_file_cache=False)
def data_iterator_fewshot(img_path,
batch_size,
imsize=(256, 256),
num_samples=1000,
shuffle=True,
rng=None):
imgs = glob.glob("{}/**/*.jpg".format(img_path), recursive=True)
if num_samples == -1:
num_samples = len(imgs)
else:
logger.info(
"Num. of data ({}) is used for debugging".format(num_samples))
def load_func(i):
img = imread(imgs[i], num_channels=3)
img = imresize(img, imsize).transpose(2, 0, 1)
img = img / 255. * 2. - 1.
return img, i
return data_iterator_simple(load_func,
num_samples,
batch_size,
shuffle=shuffle,
rng=rng,
with_file_cache=False,
with_memory_cache=False)
def data_iterator_tiny_digits(digits, batch_size=64, shuffle=False, rng=None):
def load_func(index):
"""Loading an image and its label"""
img = digits.images[index]
label = digits.target[index]
return img[None], np.array([label]).astype(np.int32)
return data_iterator_simple(load_func, digits.target.shape[0], batch_size, shuffle, rng, with_file_cache=False)
def data_iterator_celeba(img_path,
batch_size,
imsize=(128, 128),
num_samples=100,
shuffle=True,
rng=None):
imgs = glob.glob("{}/*.png".format(img_path))
if num_samples == -1:
num_samples = len(imgs)
else:
logger.info(
"Num. of data ({}) is used for debugging".format(num_samples))
def load_func(i):
cx = 89
cy = 121
img = imread(imgs[i])
img = img[cy - 64:cy + 64, cx - 64:cx + 64, :].transpose(2, 0,
1) / 255.
img = img * 2. - 1.
return img, None
return data_iterator_simple(load_func,
num_samples,
batch_size,
shuffle=shuffle,
rng=rng,
with_file_cache=False)
def test_sliced_data_iterator(test_data_csv_png_10, num_of_slices, size,
batch_size, shuffle):
def test_load_func(position):
return np.full((1), position, dtype=np.float32)
di = data_iterator_simple(test_load_func,
size,
batch_size,
shuffle=shuffle)
import six
if six.PY2:
from fractions import gcd
else:
from math import gcd
def lcm(a, b):
return abs(a * b) / gcd(a, b) if a and b else 0
max_epoch = lcm(batch_size, size) / size
all_data = []
for slice_pos in range(num_of_slices):
sliced_di = di.slice(rng=None,
num_of_slices=num_of_slices,
slice_pos=slice_pos)
sliced_data = {}
while True:
current_epoch = sliced_di.epoch
if current_epoch > max_epoch + 1:
break
data = sliced_di.next()
if current_epoch not in sliced_data:
sliced_data[current_epoch] = []
for dat in data:
for d in dat:
sliced_data[current_epoch].append(d)
all_data.append(sliced_data)
epochs = {}
for slice_pos, sliced_data in enumerate(all_data):
for epoch in sorted(sliced_data.keys()):
if epoch not in epochs:
epochs[epoch] = []
epochs[epoch].append(set(sliced_data[epoch]))
for epoch in sorted(epochs.keys()):
x0 = epochs[epoch][0]
acceptable_size = batch_size
amount = size // num_of_slices
if acceptable_size < amount:
acceptable_size = amount
for dup in [x0 & x for x in epochs[epoch][1:]]:
assert len(dup) < amount
def data_iterator_sr(num_examples,
batch_size,
gt_image,
lq_image,
train,
shuffle,
rng=None):
from args import get_config
conf = get_config()
def dataset_load_func(i):
# get images from the list
scale = conf.train.scale
gt_size = conf.train.gt_size
gt_img = read_image(gt_image[i])
lq_img = read_image(lq_image[i])
if not train:
gt_img = modcrop(gt_img, scale)
gt_img = channel_convert(gt_img.shape[2], gt_img, color="RGB")
if train:
# randomly crop
H, W, C = lq_img.shape
lq_size = gt_size // scale
rnd_h = random.randint(0, max(0, H - lq_size))
rnd_w = random.randint(0, max(0, W - lq_size))
lq_img = lq_img[rnd_h:rnd_h + lq_size, rnd_w:rnd_w + lq_size, :]
rnd_h_gt, rnd_w_gt = int(rnd_h * scale), int(rnd_w * scale)
gt_img = gt_img[rnd_h_gt:rnd_h_gt + gt_size,
rnd_w_gt:rnd_w_gt + gt_size, :]
# horizontal and vertical flipping and rotation
hflip, rot = [True, True]
hflip = hflip and random.random() < 0.5
vflip = rot and random.random() < 0.5
rot90 = rot and random.random() < 0.5
lq_img = augment(lq_img, hflip, rot90, vflip)
gt_img = augment(gt_img, hflip, rot90, vflip)
lq_img = channel_convert(C, [lq_img], color="RGB")[0]
# BGR to RGB and HWC to CHW
if gt_img.shape[2] == 3:
gt_img = gt_img[:, :, [2, 1, 0]]
lq_img = lq_img[:, :, [2, 1, 0]]
gt_img = np.ascontiguousarray(np.transpose(gt_img, (2, 0, 1)))
lq_img = np.ascontiguousarray(np.transpose(lq_img, (2, 0, 1)))
return gt_img, lq_img
return data_iterator_simple(dataset_load_func,
num_examples,
batch_size,
shuffle=shuffle,
rng=rng,
with_file_cache=False,
with_memory_cache=False)
def get_data_loader(attr_path,
image_dir,
batch_size,
batch_size_valid,
image_size,
attribute='Bangs'):
dataset, attr2idx, idx2attr = get_data_dict(attr_path, [attribute])
np.random.seed(313)
np.random.shuffle(dataset)
test_dataset = dataset[-4000:]
training_dataset = dataset[:-4000]
print("Use {} images for training.".format(len(training_dataset)))
# create data iterators.
load_func = functools.partial(stargan_load_func,
dataset=training_dataset,
image_dir=image_dir,
image_size=image_size,
crop_size=image_size)
data_iterator = data_iterator_simple(load_func,
len(training_dataset),
batch_size,
with_file_cache=False,
with_memory_cache=False)
load_func_test = functools.partial(stargan_load_func,
dataset=test_dataset,
image_dir=image_dir,
image_size=image_size,
crop_size=image_size)
test_data_iterator = data_iterator_simple(load_func_test,
len(test_dataset),
batch_size_valid,
with_file_cache=False,
with_memory_cache=False)
return data_iterator, test_data_iterator
def munit_data_iterator(img_path,
batch_size=1,
image_size=256,
num_samples=-1,
normalize_method=lambda x: (x - 127.5) / 127.5,
shuffle=True,
rng=None):
imgs = []
if type(img_path) == list:
for p in img_path:
imgs.append(p)
elif os.path.isdir(img_path):
imgs += glob.glob("{}/*.jpg".format(img_path))
imgs += glob.glob("{}/*.JPG".format(img_path))
imgs += glob.glob("{}/*.jpeg".format(img_path))
imgs += glob.glob("{}/*.JPEG".format(img_path))
imgs += glob.glob("{}/*.png".format(img_path))
imgs += glob.glob("{}/*.PNG".format(img_path))
elif img_path.endswith(".jpg") or img_path.endswith(".JPG") \
or img_path.endswith(".jpeg") or img_path.endswith(".JPEG") \
or img_path.endswith(".png") or img_path.endswith(".PNG"):
imgs.append(img_path)
else:
raise ValueError(
"Path specified is not `directory path` or `list of files`.")
if num_samples == -1:
num_samples = len(imgs)
else:
logger.info(
"Num. of data ({}) is used for debugging".format(num_samples))
def load_func(i):
img = scipy.misc.imread(imgs[i], mode="RGB")
img = scipy.misc.imresize(img, (image_size, image_size))
img = normalize_method(img)
img = img.transpose((2, 0, 1))
return img, None
return data_iterator_simple(load_func,
num_samples,
batch_size,
shuffle=shuffle,
rng=rng,
with_file_cache=False)
def data_iterator_segmentation(num_examples,
batch_size,
image_path_file,
label_path_file,
rng=None,
target_width=513,
target_height=513,
train=True):
image_paths = load_paths(image_path_file)
label_paths = load_paths(label_path_file)
def image_label_load_func(i):
'''
Returns:
image: c x h x w array
label: c x h x w array
mask: c x h x w array
'''
img = cv2.imread(image_paths[i]).astype('float32')
b, g, r = cv2.split(img)
img = cv2.merge([r, g, b])
if 'png' in label_paths[i]:
lab = imageio.imread(label_paths[i], as_gray=False,
pilmode="RGB").astype('int32')
else:
lab = np.load(label_paths[i], allow_pickle=True).astype('int32')
if lab.ndim == 2:
lab = lab[..., None]
# Compute image preprocessing time
#t = time.time()
img, lab, mask = image_preprocess.preprocess_image_and_label(
img, lab, target_width, target_height, train=train)
#elapsed = time.time() - t
return np.rollaxis(img, 2), np.rollaxis(lab, 2), np.rollaxis(mask, 2)
return data_iterator_simple(image_label_load_func,
num_examples,
batch_size,
shuffle=True,
rng=rng,
with_file_cache=False,
with_memory_cache=False)
def test_data_iterator_simple(test_data_csv_png_10, batch_size, shuffle):
src_data = []
with open(test_data_csv_png_10) as f:
for l in f.readlines():
values = [x.strip() for x in l.split(',')]
img_file_name = os.path.join(
os.path.dirname(test_data_csv_png_10), values[0])
if os.path.exists(img_file_name):
with open(img_file_name, 'rb') as img_file:
d = load_image(img_file)
src_data.append((d, [int(values[1])]))
def test_load_func(position):
return src_data[position]
size = len(src_data)
with data_iterator_simple(test_load_func, size, batch_size, shuffle=shuffle) as di:
check_data_iterator_result(di, batch_size, shuffle, False)
def test_data_iterator_simple(test_data_csv_png_10, batch_size, shuffle,
stop_exhausted):
src_data = []
with open(test_data_csv_png_10) as f:
for l in f.readlines():
values = [x.strip() for x in l.split(',')]
img_file_name = os.path.join(os.path.dirname(test_data_csv_png_10),
values[0])
if os.path.exists(img_file_name):
with open(img_file_name, 'rb') as img_file:
d = load_image(img_file)
src_data.append((d, [int(values[1])]))
def test_load_func(position):
return src_data[position]
def end_epoch(epoch):
print(f"{epoch} == {expect_epoch[0]}")
assert epoch == expect_epoch[0], "Failed for end epoch check"
assert threading.current_thread(
).ident == main_thread, "Failed for thread checking"
def begin_epoch(epoch):
print(f"{epoch} == {expect_epoch[0]}")
assert epoch == expect_epoch[0], "Failed for begin epoch check"
assert threading.current_thread(
).ident == main_thread, "Failed for thread checking"
size = len(src_data)
main_thread = threading.current_thread().ident
expect_epoch = [0]
with data_iterator_simple(test_load_func,
size,
batch_size,
shuffle=shuffle,
stop_exhausted=stop_exhausted) as di:
if batch_size // size == 0:
di.register_epoch_end_callback(begin_epoch)
di.register_epoch_end_callback(end_epoch)
di.register_epoch_end_callback(begin_epoch)
di.register_epoch_end_callback(end_epoch)
check_data_iterator_result(di, batch_size, shuffle, False,
stop_exhausted, expect_epoch)
def test_data_iterator_simple(test_data_csv_png_10, batch_size, shuffle, stop_exhausted):
src_data = []
with open(test_data_csv_png_10) as f:
for l in f.readlines():
values = [x.strip() for x in l.split(',')]
img_file_name = os.path.join(
os.path.dirname(test_data_csv_png_10), values[0])
if os.path.exists(img_file_name):
with open(img_file_name, 'rb') as img_file:
d = load_image(img_file)
src_data.append((d, [int(values[1])]))
def test_load_func(position):
return src_data[position]
size = len(src_data)
with data_iterator_simple(test_load_func, size, batch_size, shuffle=shuffle, stop_exhausted=stop_exhausted) as di:
check_data_iterator_result(
di, batch_size, shuffle, False, stop_exhausted)
def data_iterator_celeba(img_path,
attributes,
transform=None,
batch_size=32,
num_samples=-1,
shuffle=True,
rng=None):
"""
create celebA data iterator
Args:
img_path(list) : list of image paths
attributes (dict) : attribute list
transform : transform the image(data augmentation)
batch_size (int) : number of samples contained in each generated batch
num_samples (int) : number of samples taken in data loader
(if num_samples=-1, it will take all the images in the dataset)
shuffle (bool) : shuffle the data
Returns:
simple data iterator
"""
imgs = img_path
attr = attributes
if num_samples == -1:
num_samples = len(imgs)
else:
logger.info(
"Num. of data ({}) is used for debugging".format(num_samples))
def load_func(i):
pillow_image = Image.open(imgs[i])
image = np.array(pillow_image)
transformed_image = transform(image=image)['image'].transpose(2, 0, 1)
return transformed_image, attr[imgs[i]]
return data_iterator_simple(load_func,
num_samples,
batch_size,
shuffle=shuffle,
rng=rng,
with_file_cache=False)
def data_iterator_segmentation(batch_size,
image_paths,
label_paths,
rng=None,
train=True):
'''
Returns a data iterator object for semantic image segmentation dataset.
Args:
batch_size (int): Batch size
image_paths (list of str): A list of image paths
label_paths (list of str): A list of label image paths
rng (None or numpy.random.RandomState):
A random number generator used in shuffling dataset and data augmentation.
train (bool): It performs random data augmentation as preprocessing if train is True.
num_classs (int): Number of classes. Requierd if `label_mask_transformer` is not passed.
'''
assert len(image_paths) == len(label_paths)
num_examples = len(image_paths)
def image_label_load_func(i):
'''
Returns:
image: c x h x w array
label: c x h x w array
'''
img = cv2.imread(image_paths[i], cv2.IMREAD_COLOR)
lab = palette_png_reader(label_paths[i])
img, lab = image_preprocess.preprocess_image_and_label(img,
lab,
rng=rng)
return img, lab
return data_iterator_simple(image_label_load_func,
num_examples,
batch_size,
shuffle=train,
rng=rng)
num_train_batch = len(x_train) // batch_size
num_dev_batch = len(x_test) // batch_size
def load_train_func(index):
return x_train[index], y_train[index]
def load_dev_func(index):
return x_test[index], y_test[index]
train_data_iter = data_iterator_simple(load_train_func,
len(x_train),
batch_size,
shuffle=True,
with_file_cache=False)
dev_data_iter = data_iterator_simple(load_dev_func,
len(x_test),
batch_size,
shuffle=True,
with_file_cache=False)
def build_self_attention_model(train=True):
x = nn.Variable((batch_size, max_len))
t = nn.Variable((batch_size, 1))
mask = get_mask(x)
attention_mask = (F.constant(1, shape=mask.shape) - mask) * F.constant(
np.finfo(np.float32).min, shape=mask.shape)
num_train_batch = len(x_train) // batch_size
num_valid_batch = len(x_valid) // batch_size
def load_train_func(index):
return x_train[index], y_train[index]
def load_valid_func(index):
return x_valid[index], y_valid[index]
train_data_iter = data_iterator_simple(load_train_func,
len(x_train),
batch_size,
shuffle=True,
with_file_cache=False)
valid_data_iter = data_iterator_simple(load_valid_func,
len(x_valid),
batch_size,
shuffle=True,
with_file_cache=False)
x = nn.Variable((batch_size, sentence_length))
t = nn.Variable((batch_size, sentence_length, 1))
h = PF.embed(x, vocab_size, embedding_size)
h = LSTM(h, hidden, return_sequences=True)
h = TimeDistributed(PF.affine)(h, hidden, name='hidden')
y = TimeDistributed(PF.affine)(h, vocab_size, name='output')
def test_sliced_data_iterator_equivalence(test_data_csv_png_10, num_of_slices, size, batch_size, shuffle):
def lcm(a, b):
return abs(a * b) / math.gcd(a, b) if a and b else 0
max_epoch = lcm(batch_size, size) / size
def test_load_func(position):
return np.full((1), position, dtype=np.int)
def simple_load_func(data_set, position):
return data_set[position]
def get_data(iter_list, iter_num):
total = 0
for it in iter_list:
for _ in range(iter_num):
yield it.next()
total += 1
yield total
yield total
iter_num = int((max_epoch * size) / (num_of_slices * batch_size) + 0.5)
sliced_di_list = []
di = data_iterator_simple(test_load_func, size,
batch_size, shuffle=shuffle)
for slice_pos in range(num_of_slices):
sliced_di = di.slice(
rng=None, num_of_slices=num_of_slices, slice_pos=slice_pos)
sliced_di_list.append(sliced_di)
ref_di_list = []
all_data = [np.full((1), position, dtype=np.int)
for position in range(size)]
for slice_pos in range(num_of_slices):
slice_sample_size = size / num_of_slices
start_index = int(slice_sample_size * slice_pos + 0.5)
end_index = int(slice_sample_size * (slice_pos + 1) + 0.5)
slice_block_size = end_index - start_index
sliced_data = all_data[start_index: end_index]
di = data_iterator_simple(
partial(simple_load_func, sliced_data), slice_block_size, batch_size, shuffle=shuffle)
ref_di_list.append(di)
set_a = set()
set_b = set()
for ref, t in zip(get_data(ref_di_list, iter_num), get_data(sliced_di_list, iter_num)):
if isinstance(ref, tuple):
ref, t = ref[0], t[0]
if isinstance(ref, np.ndarray):
# print(f"{ref} <--> {t}")
set_a = set_a.union(set(ref))
set_b = set_b.union(set(t))
else:
#print("-" * 30)
assert ref == t
# str_a = ','.join([str(f) for f in set_a])
# str_b = ','.join([str(f) for f in set_b])
# print(f"{str_a} <--> {str_b}")
assert set_a == set_b
di_all = ref_di_list + sliced_di_list
for di in di_all:
di.close()
def load_train_func(index):
x, y = pdata[index]
negative_sample_prob = np.ones(len(pdict))
negative_sample_prob[pdict[x]] = 0.0
negative_sample_prob[pdict[y]] = 0.0
negative_sample_prob /= len(pdict) - 2
negative_sample_indices = np.random.choice(range(len(pdict)),
negative_sample_size,
replace=False,
p=negative_sample_prob)
return pdict[x], pdict[y], negative_sample_indices
train_data_iter = data_iterator_simple(load_train_func,
len(pdata),
batch_size,
shuffle=True,
with_file_cache=False)
"""
"""
def distance(u, v, eps=1e-5):
uu = F.sum(F.pow_scalar(u, 2), axis=1)
vv = F.sum(F.pow_scalar(v, 2), axis=1)
euclid_norm_pow2 = F.sum(F.pow_scalar(u - v, 2), axis=1)
alpha = F.maximum2(F.constant(eps, shape=uu.shape), 1.0 - uu)
beta = F.maximum2(F.constant(eps, shape=vv.shape), 1.0 - vv)
return F.acosh(1 + 2 * euclid_norm_pow2 / (alpha * beta))
def data_iterator_imagenet(img_path,
dirname_to_label_path,
batch_size=16,
ih=128,
iw=128,
n_classes=1000,
class_id=-1,
noise=True,
normalize=lambda x: x / 128.0 - 1.0,
train=True,
shuffle=True,
rng=None):
# ------
# Valid
# ------
if not train:
# Classes (but this tmpdir in ImageNet case)
dir_paths = glob.glob("{}/*".format(img_path))
dir_paths.sort()
dir_paths = dir_paths[0:n_classes]
# Images
imgs = []
for dir_path in dir_paths:
imgs += glob.glob("{}/*.JPEG".format(dir_path))
def load_func(i):
# image
img = Image.open(imgs[i]).resize((iw, ih),
Image.BILINEAR).convert("RGB")
img = np.asarray(img)
img = img.transpose((2, 0, 1))
img = img / 128.0 - 1.0
return img, np.array([])
di = data_iterator_simple(load_func,
len(imgs),
batch_size,
shuffle=shuffle,
rng=rng,
with_file_cache=False)
return di
# ------
# Train
# ------
# Classes
dir_paths = glob.glob("{}/*".format(img_path))
dir_paths.sort()
dir_paths = dir_paths[0:n_classes]
# Images
imgs = []
for dir_path in dir_paths:
imgs += glob.glob("{}/*.JPEG".format(dir_path))
# np.random.shuffle(imgs)
# Dirname to Label map
dirname_to_label, label_to_dirname = create_dirname_label_maps(
dirname_to_label_path)
# Filter by class_id
if class_id != -1:
dirname = label_to_dirname[class_id]
imgs = list(filter(lambda img: dirname in img, imgs))
def load_func(i):
# image
img = Image.open(imgs[i]).resize((iw, ih),
Image.BILINEAR).convert("RGB")
img = np.asarray(img)
img = img.transpose((2, 0, 1))
img = img / 128.0 - 1.0
if noise:
img += np.random.uniform(size=img.shape, low=0.0, high=1.0 / 128)
# label
elms = imgs[i].rstrip().split("/")
dname = elms[-2]
label = dirname_to_label[dname]
return img, np.array(label)
di = data_iterator_simple(load_func,
len(imgs),
batch_size,
shuffle=shuffle,
rng=rng,
with_file_cache=False)
return di
def data_iterator(num_examples, batch_size, img_left, img_right, img_disp, train, shuffle, dataset, rng=None):
def dataset_load_func(i):
# get images from the list
image_left = imread(img_left[i]).astype('float32')
image_right = imread(img_right[i]).astype('float32')
# print(img_disp)
if dataset == "SceneFlow":
from main import parser
args = parser.parse_args()
image_disp, scale = readPFM(img_disp[i])
image_disp = np.ascontiguousarray(image_disp, dtype=np.float32)
elif dataset == "Kitti":
from finetune import parser
args = parser.parse_args()
image_disp = imread(img_disp[i]).astype('float32')
image_disp = image_disp.reshape(
image_disp.shape[0], image_disp.shape[1], 1)
mean_imagenet = np.asarray([0.485, 0.456, 0.406]).astype(
np.float32).reshape(3, 1, 1)
std_imagenet = np.asarray([0.229, 0.224, 0.225]).astype(
np.float32).reshape(3, 1, 1)
if train:
w, h = image_left.shape[1], image_left.shape[0]
th, tw = args.crop_height, args.crop_width
x1 = random.randint(0, w - tw)
y1 = random.randint(0, h - th)
# crop
image_left = image_left[y1:y1 + th, x1:x1 + tw]
image_right = image_right[y1:y1 + th, x1:x1 + tw]
if dataset == "Kitti":
image_disp = np.ascontiguousarray(
image_disp, dtype=np.float32)/256
image_disp = image_disp[y1:y1 + th, x1:x1 + tw]
# normalize with mean and std
image_left, image_right, image_disp = np.rollaxis(
image_left, 2), np.rollaxis(image_right, 2), np.rollaxis(image_disp, 2)
image_left = (image_left/255).astype(np.float32)
image_right = (image_right/255).astype(np.float32)
image_left -= mean_imagenet
image_left /= std_imagenet
image_right -= mean_imagenet
image_right /= std_imagenet
else:
# crop
if dataset == "SceneFlow":
image_left = image_left[:args.im_height, :args.im_width, :]
image_right = image_right[:args.im_height, :args.im_width, :]
image_disp = image_disp[:args.im_height, :args.im_width, :]
elif dataset == "Kitti":
w, h = image_left.shape[1], image_left.shape[0]
image_left = image_left[h -
args.im_height:h, w-args.im_width:w, :]
image_right = image_right[h -
args.im_height:h, w-args.im_width:w, :]
image_disp = image_disp[h -
args.im_height:h, w-args.im_width:w, :]
image_disp = np.ascontiguousarray(
image_disp, dtype=np.float32)/256
# normalize
image_left, image_right, image_disp = np.rollaxis(
image_left, 2), np.rollaxis(image_right, 2), np.rollaxis(image_disp, 2)
image_left = (image_left/255).astype(np.float32)
image_right = (image_right/255).astype(np.float32)
image_left -= mean_imagenet
image_left /= std_imagenet
image_right -= mean_imagenet
image_right /= std_imagenet
return image_left, image_right, image_disp
return data_iterator_simple(dataset_load_func, num_examples, batch_size, shuffle=shuffle, rng=rng,
with_file_cache=False, with_memory_cache=False)
def main():
"""
Main script.
Steps:
* Get and set context.
* Load Dataset
* Initialize DataIterator.
* Create Networks
* Net for Labeled Data
* Net for Unlabeled Data
* Net for Test Data
* Create Solver.
* Training Loop.
* Test
* Training
* by Labeled Data
* Calculate Supervised Loss
* by Unlabeled Data
* Calculate Virtual Adversarial Noise
* Calculate Unsupervised Loss
"""
args = get_args()
# Get context.
from nnabla.ext_utils import get_extension_context
logger.info("Running in %s" % args.context)
ctx = get_extension_context(args.context,
device_id=args.device_id,
type_config=args.type_config)
nn.set_default_context(ctx)
shape_x = (1, 28, 28)
n_h = args.n_units
n_y = args.n_class
# Load MNIST Dataset
from mnist_data import load_mnist, data_iterator_mnist
images, labels = load_mnist(train=True)
rng = np.random.RandomState(706)
inds = rng.permutation(len(images))
def feed_labeled(i):
j = inds[i]
return images[j], labels[j]
def feed_unlabeled(i):
j = inds[i]
return images[j], labels[j]
di_l = data_iterator_simple(feed_labeled,
args.n_labeled,
args.batchsize_l,
shuffle=True,
rng=rng,
with_file_cache=False)
di_u = data_iterator_simple(feed_unlabeled,
args.n_train,
args.batchsize_u,
shuffle=True,
rng=rng,
with_file_cache=False)
di_v = data_iterator_mnist(args.batchsize_v, train=False)
# Create networks
# feed-forward-net building function
def forward(x, test=False):
return mlp_net(x, n_h, n_y, test)
# Net for learning labeled data
xl = nn.Variable((args.batchsize_l, ) + shape_x, need_grad=False)
yl = forward(xl, test=False)
tl = nn.Variable((args.batchsize_l, 1), need_grad=False)
loss_l = F.mean(F.softmax_cross_entropy(yl, tl))
# Net for learning unlabeled data
xu = nn.Variable((args.batchsize_u, ) + shape_x, need_grad=False)
yu = forward(xu, test=False)
y1 = yu.get_unlinked_variable()
y1.need_grad = False
noise = nn.Variable((args.batchsize_u, ) + shape_x, need_grad=True)
r = noise / (F.sum(noise**2, [1, 2, 3], keepdims=True))**0.5
r.persistent = True
y2 = forward(xu + args.xi_for_vat * r, test=False)
y3 = forward(xu + args.eps_for_vat * r, test=False)
loss_k = F.mean(distance(y1, y2))
loss_u = F.mean(distance(y1, y3))
# Net for evaluating validation data
xv = nn.Variable((args.batchsize_v, ) + shape_x, need_grad=False)
hv = forward(xv, test=True)
tv = nn.Variable((args.batchsize_v, 1), need_grad=False)
err = F.mean(F.top_n_error(hv, tv, n=1))
# Create solver
solver = S.Adam(args.learning_rate)
solver.set_parameters(nn.get_parameters())
# Monitor training and validation stats.
import nnabla.monitor as M
monitor = M.Monitor(args.model_save_path)
monitor_verr = M.MonitorSeries("Test error", monitor, interval=240)
monitor_time = M.MonitorTimeElapsed("Elapsed time", monitor, interval=240)
# Training Loop.
t0 = time.time()
for i in range(args.max_iter):
# Validation Test
if i % args.val_interval == 0:
valid_error = calc_validation_error(di_v, xv, tv, err,
args.val_iter)
monitor_verr.add(i, valid_error)
#################################
## Training by Labeled Data #####
#################################
# forward, backward and update
xl.d, tl.d = di_l.next()
xl.d = xl.d / 255
solver.zero_grad()
loss_l.forward(clear_no_need_grad=True)
loss_l.backward(clear_buffer=True)
solver.weight_decay(args.weight_decay)
solver.update()
#################################
## Training by Unlabeled Data ###
#################################
# Calculate y without noise, only once.
xu.d, _ = di_u.next()
xu.d = xu.d / 255
yu.forward(clear_buffer=True)
##### Calculate Adversarial Noise #####
# Do power method iteration
noise.d = np.random.normal(size=xu.shape).astype(np.float32)
for k in range(args.n_iter_for_power_method):
r.grad.zero()
loss_k.forward(clear_no_need_grad=True)
loss_k.backward(clear_buffer=True)
noise.data.copy_from(r.grad)
##### Calculate loss for unlabeled data #####
# forward, backward and update
solver.zero_grad()
loss_u.forward(clear_no_need_grad=True)
loss_u.backward(clear_buffer=True)
solver.weight_decay(args.weight_decay)
solver.update()
##### Learning rate update #####
if i % args.iter_per_epoch == 0:
solver.set_learning_rate(solver.learning_rate() *
args.learning_rate_decay)
monitor_time.add(i)
# Evaluate the final model by the error rate with validation dataset
valid_error = calc_validation_error(di_v, xv, tv, err, args.val_iter)
monitor_verr.add(i, valid_error)
monitor_time.add(i)
# Save the model.
parameter_file = os.path.join(args.model_save_path,
'params_%06d.h5' % args.max_iter)
nn.save_parameters(parameter_file)
def data_iterator_sr(conf,
num_samples,
sample_names,
tar_size,
shuffle,
rng=None):
"""
Data iterator for TecoGAN training
return: makes provision for low res & high res frames in RNN segments for specified batch_size
"""
def populate_hr_data(i):
hr_data = [] # high res rgb, in range 0-1, shape any
# moving first frame -> data augmentation
# our data augmentation, moving first frame to mimic camera motion
if conf.train.movingFirstFrame:
lefttop_pos, range_pos, is_move = moving_decision(conf)
for f_i in range(conf.train.rnn_n):
img_name = sample_names[f_i][i]
img_data = cv.imread(img_name, 3).astype(np.float32)
img_data = img_data / 255
if conf.train.movingFirstFrame:
if f_i == 0:
img_data_0 = img_data
target_size = img_data.shape
# random data augmentation -> move first frame only with 30% probability
if not is_move < 0.7:
img_data = img_data_0[lefttop_pos[f_i][1]:target_size[0] -
range_pos[1] + lefttop_pos[f_i][1],
lefttop_pos[f_i][0]:target_size[1] -
range_pos[0] +
lefttop_pos[f_i][0], :]
hr_data.append(img_data)
return hr_data
def dataset_load_func(i):
hr_data = populate_hr_data(i)
# random crop each batch entry separately
# Check whether perform crop
if conf.train.random_crop is True:
cur_size = hr_data[0].shape
offset_h = np.floor(
np.random.uniform(0, cur_size[0] - tar_size, [])).astype(int)
offset_w = np.floor(
np.random.uniform(0, cur_size[1] - tar_size, [])).astype(int)
for frame_t in range(conf.train.rnn_n):
hr_data[frame_t] = hr_data[frame_t][offset_h:offset_h +
tar_size,
offset_w:offset_w +
tar_size, :]
# random flip:
if conf.train.flip is True:
# Produce the decision of random flip
flip_decision = np.random.uniform(0, 1, []).astype(float)
for frame_t in range(conf.train.rnn_n):
if flip_decision < 0.5:
np.fliplr(hr_data[frame_t])
hr_frames = hr_data
target_frames = []
k_w_border = int(1.5 * 3.0)
for rnn_inst in range(conf.train.rnn_n):
# crop out desired data
cropped_data = hr_data[rnn_inst][k_w_border:k_w_border +
conf.train.crop_size * 4,
k_w_border:k_w_border +
conf.train.crop_size * 4, :]
pre_processed_data = preprocess(cropped_data)
target_frames.append(pre_processed_data)
return hr_frames, target_frames
return data_iterator_simple(dataset_load_func,
num_samples,
conf.train.batch_size,
shuffle=shuffle,
rng=rng,
with_file_cache=False,
with_memory_cache=False)
def train(args):
if args.c_dim != len(args.selected_attrs):
print("c_dim must be the same as the num of selected attributes. Modified c_dim.")
args.c_dim = len(args.selected_attrs)
# Dump the config information.
config = dict()
print("Used config:")
for k in args.__dir__():
if not k.startswith("_"):
config[k] = getattr(args, k)
print("'{}' : {}".format(k, getattr(args, k)))
# Prepare Generator and Discriminator based on user config.
generator = functools.partial(
model.generator, conv_dim=args.g_conv_dim, c_dim=args.c_dim, num_downsample=args.num_downsample, num_upsample=args.num_upsample, repeat_num=args.g_repeat_num)
discriminator = functools.partial(model.discriminator, image_size=args.image_size,
conv_dim=args.d_conv_dim, c_dim=args.c_dim, repeat_num=args.d_repeat_num)
x_real = nn.Variable(
[args.batch_size, 3, args.image_size, args.image_size])
label_org = nn.Variable([args.batch_size, args.c_dim, 1, 1])
label_trg = nn.Variable([args.batch_size, args.c_dim, 1, 1])
with nn.parameter_scope("dis"):
dis_real_img, dis_real_cls = discriminator(x_real)
with nn.parameter_scope("gen"):
x_fake = generator(x_real, label_trg)
x_fake.persistent = True # to retain its value during computation.
# get an unlinked_variable of x_fake
x_fake_unlinked = x_fake.get_unlinked_variable()
with nn.parameter_scope("dis"):
dis_fake_img, dis_fake_cls = discriminator(x_fake_unlinked)
# ---------------- Define Loss for Discriminator -----------------
d_loss_real = (-1) * loss.gan_loss(dis_real_img)
d_loss_fake = loss.gan_loss(dis_fake_img)
d_loss_cls = loss.classification_loss(dis_real_cls, label_org)
d_loss_cls.persistent = True
# Gradient Penalty.
alpha = F.rand(shape=(args.batch_size, 1, 1, 1))
x_hat = F.mul2(alpha, x_real) + \
F.mul2(F.r_sub_scalar(alpha, 1), x_fake_unlinked)
with nn.parameter_scope("dis"):
dis_for_gp, _ = discriminator(x_hat)
grads = nn.grad([dis_for_gp], [x_hat])
l2norm = F.sum(grads[0] ** 2.0, axis=(1, 2, 3)) ** 0.5
d_loss_gp = F.mean((l2norm - 1.0) ** 2.0)
# total discriminator loss.
d_loss = d_loss_real + d_loss_fake + args.lambda_cls * \
d_loss_cls + args.lambda_gp * d_loss_gp
# ---------------- Define Loss for Generator -----------------
g_loss_fake = (-1) * loss.gan_loss(dis_fake_img)
g_loss_cls = loss.classification_loss(dis_fake_cls, label_trg)
g_loss_cls.persistent = True
# Reconstruct Images.
with nn.parameter_scope("gen"):
x_recon = generator(x_fake_unlinked, label_org)
x_recon.persistent = True
g_loss_rec = loss.recon_loss(x_real, x_recon)
g_loss_rec.persistent = True
# total generator loss.
g_loss = g_loss_fake + args.lambda_rec * \
g_loss_rec + args.lambda_cls * g_loss_cls
# -------------------- Solver Setup ---------------------
d_lr = args.d_lr # initial learning rate for Discriminator
g_lr = args.g_lr # initial learning rate for Generator
solver_dis = S.Adam(alpha=args.d_lr, beta1=args.beta1, beta2=args.beta2)
solver_gen = S.Adam(alpha=args.g_lr, beta1=args.beta1, beta2=args.beta2)
# register parameters to each solver.
with nn.parameter_scope("dis"):
solver_dis.set_parameters(nn.get_parameters())
with nn.parameter_scope("gen"):
solver_gen.set_parameters(nn.get_parameters())
# -------------------- Create Monitors --------------------
monitor = Monitor(args.monitor_path)
monitor_d_cls_loss = MonitorSeries(
'real_classification_loss', monitor, args.log_step)
monitor_g_cls_loss = MonitorSeries(
'fake_classification_loss', monitor, args.log_step)
monitor_loss_dis = MonitorSeries(
'discriminator_loss', monitor, args.log_step)
monitor_recon_loss = MonitorSeries(
'reconstruction_loss', monitor, args.log_step)
monitor_loss_gen = MonitorSeries('generator_loss', monitor, args.log_step)
monitor_time = MonitorTimeElapsed("Training_time", monitor, args.log_step)
# -------------------- Prepare / Split Dataset --------------------
using_attr = args.selected_attrs
dataset, attr2idx, idx2attr = get_data_dict(args.attr_path, using_attr)
random.seed(313) # use fixed seed.
random.shuffle(dataset) # shuffle dataset.
test_dataset = dataset[-2000:] # extract 2000 images for test
if args.num_data:
# Use training data partially.
training_dataset = dataset[:min(args.num_data, len(dataset) - 2000)]
else:
training_dataset = dataset[:-2000]
print("Use {} images for training.".format(len(training_dataset)))
# create data iterators.
load_func = functools.partial(stargan_load_func, dataset=training_dataset,
image_dir=args.celeba_image_dir, image_size=args.image_size, crop_size=args.celeba_crop_size)
data_iterator = data_iterator_simple(load_func, len(
training_dataset), args.batch_size, with_file_cache=False, with_memory_cache=False)
load_func_test = functools.partial(stargan_load_func, dataset=test_dataset,
image_dir=args.celeba_image_dir, image_size=args.image_size, crop_size=args.celeba_crop_size)
test_data_iterator = data_iterator_simple(load_func_test, len(
test_dataset), args.batch_size, with_file_cache=False, with_memory_cache=False)
# Keep fixed test images for intermediate translation visualization.
test_real_ndarray, test_label_ndarray = test_data_iterator.next()
test_label_ndarray = test_label_ndarray.reshape(
test_label_ndarray.shape + (1, 1))
# -------------------- Training Loop --------------------
one_epoch = data_iterator.size // args.batch_size
num_max_iter = args.max_epoch * one_epoch
for i in range(num_max_iter):
# Get real images and labels.
real_ndarray, label_ndarray = data_iterator.next()
label_ndarray = label_ndarray.reshape(label_ndarray.shape + (1, 1))
label_ndarray = label_ndarray.astype(float)
x_real.d, label_org.d = real_ndarray, label_ndarray
# Generate target domain labels randomly.
rand_idx = np.random.permutation(label_org.shape[0])
label_trg.d = label_ndarray[rand_idx]
# ---------------- Train Discriminator -----------------
# generate fake image.
x_fake.forward(clear_no_need_grad=True)
d_loss.forward(clear_no_need_grad=True)
solver_dis.zero_grad()
d_loss.backward(clear_buffer=True)
solver_dis.update()
monitor_loss_dis.add(i, d_loss.d.item())
monitor_d_cls_loss.add(i, d_loss_cls.d.item())
monitor_time.add(i)
# -------------- Train Generator --------------
if (i + 1) % args.n_critic == 0:
g_loss.forward(clear_no_need_grad=True)
solver_dis.zero_grad()
solver_gen.zero_grad()
x_fake_unlinked.grad.zero()
g_loss.backward(clear_buffer=True)
x_fake.backward(grad=None)
solver_gen.update()
monitor_loss_gen.add(i, g_loss.d.item())
monitor_g_cls_loss.add(i, g_loss_cls.d.item())
monitor_recon_loss.add(i, g_loss_rec.d.item())
monitor_time.add(i)
if (i + 1) % args.sample_step == 0:
# save image.
save_results(i, args, x_real, x_fake,
label_org, label_trg, x_recon)
if args.test_during_training:
# translate images from test dataset.
x_real.d, label_org.d = test_real_ndarray, test_label_ndarray
label_trg.d = test_label_ndarray[rand_idx]
x_fake.forward(clear_no_need_grad=True)
save_results(i, args, x_real, x_fake, label_org,
label_trg, None, is_training=False)
# Learning rates get decayed
if (i + 1) > int(0.5 * num_max_iter) and (i + 1) % args.lr_update_step == 0:
g_lr = max(0, g_lr - (args.lr_update_step *
args.g_lr / float(0.5 * num_max_iter)))
d_lr = max(0, d_lr - (args.lr_update_step *
args.d_lr / float(0.5 * num_max_iter)))
solver_gen.set_learning_rate(g_lr)
solver_dis.set_learning_rate(d_lr)
print('learning rates decayed, g_lr: {}, d_lr: {}.'.format(g_lr, d_lr))
# Save parameters and training config.
param_name = 'trained_params_{}.h5'.format(
datetime.datetime.today().strftime("%m%d%H%M"))
param_path = os.path.join(args.model_save_path, param_name)
nn.save_parameters(param_path)
config["pretrained_params"] = param_name
with open(os.path.join(args.model_save_path, "training_conf_{}.json".format(datetime.datetime.today().strftime("%m%d%H%M"))), "w") as f:
json.dump(config, f)
# -------------------- Translation on test dataset --------------------
for i in range(args.num_test):
real_ndarray, label_ndarray = test_data_iterator.next()
label_ndarray = label_ndarray.reshape(label_ndarray.shape + (1, 1))
label_ndarray = label_ndarray.astype(float)
x_real.d, label_org.d = real_ndarray, label_ndarray
rand_idx = np.random.permutation(label_org.shape[0])
label_trg.d = label_ndarray[rand_idx]
x_fake.forward(clear_no_need_grad=True)
save_results(i, args, x_real, x_fake, label_org,
label_trg, None, is_training=False)
def data_iterator(conf, shuffle, rng=None):
"""
Data iterator for Zooming SloMo training
return:
"""
assert conf.data.n_frames > 1, 'Error: Not enough LR frames to interpolate'
half_n_frames = conf.data.n_frames // 2
# determine the LQ frame list
# N | frames
# 1 | error
# 3 | 0,2
# 5 | 0,2,4
# 7 | 0,2,4,6
lr_index_list = [i * 2 for i in range(1 + half_n_frames)]
paths_gt = pickle.load(open(conf.data.cache_keys, 'rb'))
gt_lmdb = lmdb.open(conf.data.lmdb_data_gt,
readonly=True,
lock=False,
readahead=False,
meminit=False)
lq_lmdb = lmdb.open(conf.data.lmdb_data_lq,
readonly=True,
lock=False,
readahead=False,
meminit=False)
center_frame_idx = random.randint(2, 6) # 2<= index <=6
def determine_neighbor_list(central_frame_idx):
"""
given central frame index, determine neighborhood frames
"""
interval = random.choice(conf.data.interval_list)
if conf.data.border_mode:
direction = 1 # 1: forward; 0: backward
if conf.random_reverse and random.random() < 0.5:
direction = random.choice([0, 1])
if central_frame_idx + interval * (conf.data.n_frames - 1) > 7:
direction = 0
elif central_frame_idx - interval * (conf.data.n_frames - 1) < 1:
direction = 1
# get the neighbor list
if direction == 1:
neighbor_list = list(
range(central_frame_idx,
central_frame_idx + interval * conf.data.n_frames,
interval))
else:
neighbor_list = list(
range(central_frame_idx,
central_frame_idx - interval * conf.data.n_frames,
-interval))
else:
# ensure not exceeding the borders
while (central_frame_idx + half_n_frames * interval > 7) or \
(central_frame_idx - half_n_frames * interval < 1):
central_frame_idx = random.randint(2, 6)
# get the neighbor list
neighbor_list = list(
range(central_frame_idx - half_n_frames * interval,
central_frame_idx + half_n_frames * interval + 1,
interval))
if conf.data.random_reverse and random.random() < 0.5:
neighbor_list.reverse()
return neighbor_list
neighbors = determine_neighbor_list(center_frame_idx)
lq_frames_list = [neighbors[i] for i in lr_index_list]
assert len(neighbors) == conf.data.n_frames, \
'Wrong length of neighbor list: {}'.format(len(neighbors))
# image read and augment functions
def augment(img_list, flip=True, rot=True):
# flip OR rotate
def _augment(img):
if flip and random.random() < 0.5:
# horizontal flip
img = img[:, ::-1, :]
if rot and random.random() < 0.5:
# vertical flip and 90 degree rotation
img = img[::-1, :, :]
img = img.transpose(1, 0, 2)
return img
return [_augment(img) for img in img_list]
def _read_img_from_lmdb(env, key, size):
"""
read image from lmdb with key (w/ and w/o fixed size)
size: (channels, height, width) tuple
"""
with env.begin(write=False) as txn:
buf = txn.get(key.encode('ascii'))
img_flat = np.frombuffer(buf, dtype=np.uint8)
channels, height, width = size
img = img_flat.reshape(height, width, channels)
img = img.astype(np.float32) / 255.
if img.ndim == 2:
img = np.expand_dims(img, axis=2)
# some images have 4 channels
if img.shape[2] > 3:
img = img[:, :, :3]
return img
def load_zoomingslomo_data(i):
"""
loads data, given the index -> primary function in data loader
"""
key = paths_gt[i]
# get the GT image (as the center frame)
img_gt_l = [
_read_img_from_lmdb(gt_lmdb, key + '_{}'.format(v), (3, 256, 448))
for v in neighbors
]
# get Low Quality images
lq_size_tuple = (3, 64, 112)
img_lq_l = [
_read_img_from_lmdb(lq_lmdb, key + '_{}'.format(v), lq_size_tuple)
for v in lq_frames_list
]
_, height, width = lq_size_tuple # LQ size
# randomly crop
scale = 4
gt_size = conf.data.gt_size
lr_size = gt_size // scale
rnd_h = random.randint(0, max(0, height - lr_size))
rnd_w = random.randint(0, max(0, width - lr_size))
img_lq_l = [
v[rnd_h:rnd_h + lr_size, rnd_w:rnd_w + lr_size, :]
for v in img_lq_l
]
rnd_h_highres, rnd_w_highres = int(rnd_h * scale), int(rnd_w * scale)
img_gt_l = [
v[rnd_h_highres:rnd_h_highres + gt_size,
rnd_w_highres:rnd_w_highres + gt_size, :] for v in img_gt_l
]
# augmentation - flip, rotate
img_lq_l = img_lq_l + img_gt_l
rlt = augment(img_lq_l, conf.data.use_flip, conf.data.use_rot)
img_lq_l = rlt[0:-conf.data.n_frames]
img_gt_l = rlt[-conf.data.n_frames:]
# stack LQ and GT images in NHWC order, N is the frame number
img_lq_stack = np.stack(img_lq_l, axis=0)
img_gt_stack = np.stack(img_gt_l, axis=0)
# numpy to tensor
img_gt_stack = img_gt_stack[:, :, :, [2, 1, 0]] # BGR to RGB
img_lq_stack = img_lq_stack[:, :, :, [2, 1, 0]] # BGR to RGB
img_gt_stack = np.ascontiguousarray(
np.transpose(img_gt_stack, (0, 3, 1, 2))) # HWC to CHW
img_lq_stack = np.ascontiguousarray(
np.transpose(img_lq_stack, (0, 3, 1, 2))) # HWC to CHW
return img_lq_stack, img_gt_stack
def load_slomo_data(i):
"""
loads data, given the index -> primary function in data loader
"""
key = paths_gt[i]
gt_size_tuple = (3, 256, 448)
# get the GT image (as the center frame)
img_gt_l = [
_read_img_from_lmdb(gt_lmdb, key + '_{}'.format(v), gt_size_tuple)
for v in neighbors
]
_, height, width = gt_size_tuple # GT size
# randomly crop
gt_size = conf.data.gt_size
rnd_h = random.randint(0, max(0, height - gt_size))
rnd_w = random.randint(0, max(0, width - gt_size))
img_gt_l = [
v[rnd_h:rnd_h + gt_size, rnd_w:rnd_w + gt_size, :]
for v in img_gt_l
]
# augmentation - flip, rotate
img_gt_l = augment(img_gt_l, conf.data.use_flip, conf.data.use_rot)
# stack LQ and GT images in NHWC order, N is the frame number
img_gt_stack = np.stack(img_gt_l, axis=0)
# numpy to tensor
img_gt_stack = img_gt_stack[:, :, :, [2, 1, 0]] # BGR to RGB
img_gt_stack = np.ascontiguousarray(
np.transpose(img_gt_stack, (0, 3, 1, 2))) # HWC to CHW
return _, img_gt_stack
dataset_load_func = load_zoomingslomo_data if not conf.train.only_slomo else load_slomo_data
return data_iterator_simple(dataset_load_func,
len(paths_gt),
conf.train.batch_size,
shuffle=shuffle,
rng=rng,
with_file_cache=False,
with_memory_cache=False)
