def tf_data_to_COCO(ds: tf.data.Dataset, class2idx: Mapping[str, int]) -> COCO:
gt_coco: dict = dict(images=[], annotations=[])
image_id = 1
annot_id = 1
# Create COCO categories
categories = [
dict(supercategory='instance', id=i, name=n)
for n, i in class2idx.items()
]
gt_coco['categories'] = categories
for image, (labels, bbs) in ds.unbatch():
h, w = image.shape[0:2]
im_annot, annots = _COCO_gt_annot(image_id, annot_id, (h, w), labels,
bbs)
gt_coco['annotations'].extend(annots)
gt_coco['images'].append(im_annot)
annot_id += len(annots)
image_id += 1
gtCOCO = COCO()
gtCOCO.dataset = gt_coco
gtCOCO.createIndex()
return gtCOCO
def call(self, dataset: tf.data.Dataset):
r"""
Perform the adversarial training.
Args:
dataset (:py:class:`tf.data.Dataset`): The adversarial training dataset.
"""
current_epoch = self._current_epoch()
self._update_global_batch_size(
dataset, [self._d_loss, self._g_loss, self._e_loss]
)
dataset = wrap(
dataset.unbatch().batch(self._global_batch_size, drop_remainder=True)
)
samples = next(iter(dataset.take(1)))
gen_inputs = samples[1]
with self._train_summary_writer.as_default():
self._log("real_x", samples[0][0])
self._log("real_y", samples[0][1])
for epoch in tf.range(current_epoch, self._epochs):
distribute_dataset = self._distribute_strategy.experimental_distribute_dataset(
dataset
)
for example in distribute_dataset:
d_loss, g_loss, e_loss, fake, generator_of_encoder = self._train_step(
example
)
self._global_step.assign_add(1)
if tf.equal(tf.math.mod(self._global_step, 10), 0):
tf.print(
f"[{self._global_step.numpy()}] g_loss: {g_loss} - "
f"d_loss: {d_loss} - e_loss: {e_loss}"
)
self._measure_performance(
tf.data.Dataset.from_tensor_slices(example).batch(
self._global_batch_size
)
)
self._epoch_completed(epoch + 1)
if self._log_eval_mode == LogEvalMode.TEST:
self._log("generator", self._generator(gen_inputs, training=False))
self._log(
"generator_of_encoder",
self._generator(
self._encoder(samples[0][0], training=False), training=False
),
)
elif self._log_eval_mode == LogEvalMode.TRAIN:
self._log("generator", fake)
self._log("generator_of_encoder", generator_of_encoder)
def processing(dataset: tf.data.Dataset, window_size, batch_size):
dataset = dataset.map(lambda x: table.lookup(x))
dataset = dataset.unbatch()
dataset = dataset.window(window_size+1, shift = 1, drop_remainder=True)
dataset = dataset.flat_map(lambda ds: ds.batch(window_size+1))
dataset = dataset.map(lambda x: (x[:-1], x[-1]-1))
dataset = dataset.shuffle(10000)
dataset = dataset.batch(batch_size).prefetch(1)
return dataset
def augment_random_warp(ds: tf.data.Dataset, process_in_batch=10, **options) -> tf.data.Dataset:
'''apply augmentation based on image warping
Args:
process_in_batch: the number of images to apply warping in a batch
None to disable this feature
options: options to be passed to random_warp function
'''
if process_in_batch is not None:
ds = ds.batch(process_in_batch)
ds = ds.map(
lambda image: random_warp(image, process_in_batch=process_in_batch, **options),
num_parallel_calls=tf.data.experimental.AUTOTUNE,
)
if process_in_batch is not None:
ds = ds.unbatch()
return ds
def size_of_dataset(dataset: tf.data.Dataset) -> int:
count = 0
for element in dataset.unbatch().batch(1):
count += 1
return count
def _pack_with_tf_ops(dataset: tf.data.Dataset, keys: List[str],
key2length: Dict[str, int]) -> tf.data.Dataset:
"""Helper-function for packing a dataset which has already been batched.
Helper for pack_dataset() Uses tf.while_loop.
Args:
dataset: a dataset containing padded batches of examples.
keys: a list of strings
key2length: an dict from feature-key to integer
Returns:
a dataset.
"""
empty_example = {}
for k in keys:
empty_example[k] = tf.zeros([0], dtype=tf.int32)
empty_example[k + '_position'] = tf.zeros([0], dtype=tf.int32)
keys_etc = empty_example.keys()
def write_packed_example(partial, outputs):
new_partial = empty_example.copy()
new_outputs = {}
for k in keys_etc:
new_outputs[k] = outputs[k].write(
outputs[k].size(),
tf.pad(partial[k], [[0, key2length[k] - tf.size(partial[k])]]))
return new_partial, new_outputs
def map_fn(x):
"""Internal function to flat_map over.
Consumes a batch of input examples and produces a variable number of output
examples.
Args:
x: a single example
Returns:
a tf.data.Dataset
"""
partial = empty_example.copy()
i = tf.zeros([], dtype=tf.int32)
dynamic_batch_size = tf.shape(x[keys[0]])[0]
outputs = {}
for k in keys:
outputs[k] = tf.TensorArray(tf.int32,
size=0,
dynamic_size=True,
element_shape=[key2length[k]])
outputs[k + '_position'] = tf.TensorArray(
tf.int32,
size=0,
dynamic_size=True,
element_shape=[key2length[k]])
def body_fn(i, partial, outputs):
"""Body function for while_loop.
Args:
i: integer scalar
partial: dictionary of Tensor (partially-constructed example)
outputs: dictionary of TensorArray
Returns:
A triple containing the new values of the inputs.
"""
can_append = True
one_example = {}
for k in keys:
val = tf.cast(x[k][i], tf.int32)
val = val[:tf.
reduce_sum(tf.cast(tf.not_equal(val, 0), tf.int32))]
one_example[k] = val
for k in keys:
can_append = tf.logical_and(
can_append,
tf.less_equal(
tf.size(partial[k]) + tf.size(one_example[k]),
key2length[k]))
def false_fn():
return write_packed_example(partial, outputs)
def true_fn():
return partial, outputs
partial, outputs = tf.cond(can_append, true_fn, false_fn)
new_partial = {}
for k in keys:
new_seq = one_example[k][:key2length[k]]
new_seq_len = tf.size(new_seq)
new_partial[k] = tf.concat([partial[k], new_seq], 0)
new_partial[k + '_position'] = tf.concat(
[partial[k + '_position'],
tf.range(new_seq_len)], 0)
partial = new_partial
return i + 1, partial, outputs
# For loop over all examples in the batch.
i, partial, outputs = tf.while_loop(
cond=lambda *_: True,
body=body_fn,
loop_vars=(i, partial, outputs),
shape_invariants=(
tf.TensorShape([]),
{k: tf.TensorShape([None])
for k in keys_etc},
{k: tf.TensorShape(None)
for k in keys_etc},
),
maximum_iterations=dynamic_batch_size)
_, outputs = write_packed_example(partial, outputs)
packed = {k: outputs[k].stack() for k in keys_etc}
for k in keys:
packed[k + '_segmentation'] = (tf.cumsum(
tf.cast(tf.equal(packed[k + '_position'], 0), tf.int32),
axis=1) * tf.cast(tf.not_equal(packed[k], 0), tf.int32))
return packed
dataset = dataset.map(map_fn, num_parallel_calls=AUTOTUNE)
return dataset.unbatch()
def call(
self,
training_set: tf.data.Dataset,
validation_set: tf.data.Dataset,
log_freq: int = 10,
measure_performance_freq: int = 10,
):
"""
Start the training.
Args:
training_set (:py:obj:`tf.data.Dataset`): Training dataset.
validation_set (:py:obj:`tf.data.Dataset`): Validation dataset.
log_freq (int): Specifies how many steps to run before logging the losses,
e.g. `log_frequency=10` logs every 10 steps of training.
Pass `log_frequency<=0` in case you don't want to log.
measure_performance_freq (int): Specifies how many steps to run before
measuring the performance, e.g. `measure_performance_freq=10`
measures performance every 10 steps of training.
Pass `measure_performance_freq<=0` in case you don't want to measure
performance.
"""
# set the context properties
self._context.training_set = training_set
self._context.validation_set = validation_set
current_epoch = self._current_epoch()
self._update_global_batch_size(training_set, self._loss)
# measure performance on the validation set
with self._eval_summary_writer.as_default():
self._context.dataset = validation_set
self._measure_performance()
# need to use the global batch size in the training set
training_set = wrap(training_set.unbatch().batch(
self._global_batch_size,
drop_remainder=tf.distribute.has_strategy()))
with self._train_summary_writer.as_default():
# notify on train start
self._on_train_start()
for _ in tf.range(current_epoch, self._epochs):
distribute_dataset = self._distribute_strategy.experimental_distribute_dataset(
training_set)
# notify on epoch start
self._on_epoch_start()
for example in distribute_dataset:
self._context.current_batch = self.local_example(
example, (1, 1))
# notify on batch start
self._on_batch_start()
# perform training step
loss = self._train_step(example)
# increase global step
self._global_step.assign_add(1)
# log loss if needed
if log_freq > 0 and tf.equal(
tf.math.mod(self._global_step, log_freq), 0):
tf.print(f"[{self._global_step.numpy()}] loss: {loss}")
# measure performance
# this can also be moved to on_batch_end
self._measure_performance_if_needed(
example, measure_performance_freq)
# notify on batch end
self._on_batch_end()
# notify on epoch end
self._on_epoch_end()
with self._eval_summary_writer.as_default():
self._context.dataset = validation_set
self._measure_performance()
# final callback
self._on_train_end()
def __init__(self, log_dir: str, predict_images: tf.data.Dataset, num_images: int = 5):
super().__init__()
self.num_images = num_images
self.predict_images = predict_images.unbatch().shuffle(5000).take(num_images)
self.writer = tf.summary.create_file_writer(os.path.join(log_dir, "images"))
def size_of_dataset(dataset: tf.data.Dataset) -> int:
count = len(list(dataset.unbatch().as_numpy_iterator()))
return count
def dataset_extract_images(D: tf.data.Dataset) -> tf.data.Dataset:
D = D.map(extract_image_and_label, num_parallel_calls=4)
D = D.batch(1).map(transform_image, num_parallel_calls=4)
D = D.unbatch()
return D
def call(
self,
dataset: tf.data.Dataset,
log_freq: int = 10,
measure_performance_freq: int = 10,
):
r"""
Perform the adversarial training.
Args:
dataset (:py:class:`tf.data.Dataset`): The adversarial training dataset.
log_freq (int): Specifies how many steps to run before logging the losses,
e.g. `log_frequency=10` logs every 10 steps of training.
Pass `log_frequency<=0` in case you don't want to log.
measure_performance_freq (int): Specifies how many steps to run before
measuring the performance, e.g. `measure_performance_freq=10`
measures performance every 10 steps of training.
Pass `measure_performance_freq<=0` in case you don't want to measure
performance.
"""
current_epoch = self._current_epoch()
self._update_global_batch_size(
dataset,
[
self._discriminator_loss, self._generator_loss,
self._encoder_loss
],
)
dataset = wrap(dataset.unbatch().batch(self._global_batch_size,
drop_remainder=True))
samples = next(iter(dataset.take(1)))
self._context.generator_inputs = samples[1]
self._context.encoder_inputs = samples[0][0]
with self._train_summary_writer.as_default():
# notify on train start event
self._on_train_start()
for _ in tf.range(current_epoch, self._epochs):
distribute_dataset = self._distribute_strategy.experimental_distribute_dataset(
dataset)
# notify on epoch start event
self._on_epoch_start()
for example in distribute_dataset:
# perform training step
d_loss, g_loss, e_loss, fake, generator_of_encoder = self._train_step(
example)
# increase global step
self._global_step.assign_add(1)
# setup fake_samples
self._context.fake_samples = fake
self._context.generator_of_encoder = generator_of_encoder
# Log losses
if log_freq > 0 and tf.equal(
tf.math.mod(self._global_step, log_freq), 0):
tf.print(
f"[{self._global_step.numpy()}] g_loss: {g_loss} - "
f"d_loss: {d_loss} - e_loss: {e_loss}")
# measure performance if needed
self._measure_performance_if_needed(
example, measure_performance_freq)
# notify on batch end event
self._on_batch_end()
# notify on epoch end event
self._on_epoch_end()
# notify on training end event
self._on_train_end()
def transform_dataset(self, ds_input: tf.data.Dataset) -> tf.data.Dataset:
"""Create a dataset with unbatched elements."""
return ds_input.unbatch()
def test_model(model: tf.keras.Model, test_ds: tf.data.Dataset, select_im=1):
"""
Tests model with dataset pipeline, shows bbox ellipse and GT-Predictions
:param model: Model object
:param test_ds: Evaluation dataset object
:param select_im: Selected image number
"""
for idx, (x, y) in enumerate(
test_ds.unbatch().take(select_im).as_numpy_iterator()):
# Shows only selected image
if idx == select_im - 1:
# Unpack GT values
img = x
class_type = y[3]
is_defect = y[0]
bbox_param = y[1]
bbox_center = y[2]
# Create empty axis for inference
# Model expects (batch_size, 224, 224, 3) shaped input
img_arr = np.array(img)[np.newaxis, :, :, :]
# Inference
y_pred = model.predict(img_arr)
# Convert unsigned inter to show
img_arr = (img_arr * 255).astype(np.uint8)
# Unpack prediction results
class_type_pred = y_pred[3]
is_defect_pred = y_pred[0]
bbox_param_pred = np.squeeze(y_pred[1])
bbox_center_pred = np.squeeze(y_pred[2])
# Select batch and resize to 512-512
img_arr = Image.fromarray(img_arr[0])
img_arr = img_arr.resize((512, 512))
# Print logs
print(
f'Is defected: \tGT vs Prediction | {is_defect} - {is_defect_pred.squeeze()}'
)
print(
f'Class type: \tGT vs Prediction | {np.argmax(class_type)} - {np.argmax(class_type_pred.squeeze())}'
)
print(
f'Bbox center: \tGT vs Prediction | {bbox_center} - {bbox_center_pred}'
)
print(
f'Bbox params: \tGT vs Prediction | {bbox_param} - {bbox_param_pred}'
)
print(
f'Bbox center \tL2 Distance | {np.mean((bbox_center - bbox_center_pred) ** 2)}'
)
# Plot configuration
fig, ax = plt.subplots(figsize=(12, 12))
plt.imshow(img_arr, cmap='gray')
# Creating un-filled ellipse on image
if is_defect > 0.5:
e = Ellipse(xy=(bbox_center_pred * 512),
width=bbox_param_pred[0] * 256,
height=bbox_param_pred[1] * 256,
angle=((bbox_param_pred[2] * 2 * np.pi - np.pi) *
180 / np.pi),
edgecolor='b',
lw=2,
facecolor='none')
e.set_alpha(0.8)
ax.add_artist(e)
e_org = Ellipse(xy=(bbox_center * 512),
width=bbox_param[0] * 256,
height=bbox_param[1] * 256,
angle=((bbox_param[2] * 2 * np.pi - np.pi) *
180 / np.pi),
edgecolor='r',
lw=2,
facecolor='none')
e_org.set_alpha(0.8)
ax.add_artist(e_org)
plt.show()
