def train(hparams, num_epoch, tuning):
log_dir = './results/'
test_batch_size = 8
# Load dataset
training_set, valid_set = make_dataset(BATCH_SIZE=hparams['HP_BS'],
file_name='train_tf_record',
split=True)
test_set = make_dataset(BATCH_SIZE=test_batch_size,
file_name='test_tf_record',
split=False)
class_names = ['NRDR', 'RDR']
# Model
model = ResNet()
# set optimizer
optimizer = tf.keras.optimizers.Adam(learning_rate=hparams['HP_LR'])
# set metrics
train_accuracy = tf.keras.metrics.SparseCategoricalAccuracy()
valid_accuracy = tf.keras.metrics.Accuracy()
valid_con_mat = ConfusionMatrix(num_class=2)
test_accuracy = tf.keras.metrics.Accuracy()
test_con_mat = ConfusionMatrix(num_class=2)
# Save Checkpoint
if not tuning:
ckpt = tf.train.Checkpoint(step=tf.Variable(1),
optimizer=optimizer,
net=model)
manager = tf.train.CheckpointManager(ckpt, './tf_ckpts', max_to_keep=5)
# Set up summary writers
current_time = datetime.datetime.now().strftime("%Y%m%d-%H%M%S")
tb_log_dir = log_dir + current_time + '/train'
summary_writer = tf.summary.create_file_writer(tb_log_dir)
# Restore Checkpoint
if not tuning:
ckpt.restore(manager.latest_checkpoint)
if manager.latest_checkpoint:
logging.info('Restored from {}'.format(manager.latest_checkpoint))
else:
logging.info('Initializing from scratch.')
@tf.function
def train_step(train_img, train_label):
# Optimize the model
loss_value, grads = grad(model, train_img, train_label)
optimizer.apply_gradients(zip(grads, model.trainable_variables))
train_pred, _ = model(train_img)
train_label = tf.expand_dims(train_label, axis=1)
train_accuracy.update_state(train_label, train_pred)
for epoch in range(num_epoch):
begin = time()
# Training loop
for train_img, train_label, train_name in training_set:
train_img = data_augmentation(train_img)
train_step(train_img, train_label)
with summary_writer.as_default():
tf.summary.scalar('Train Accuracy',
train_accuracy.result(),
step=epoch)
for valid_img, valid_label, _ in valid_set:
valid_img = tf.cast(valid_img, tf.float32)
valid_img = valid_img / 255.0
valid_pred, _ = model(valid_img, training=False)
valid_pred = tf.cast(tf.argmax(valid_pred, axis=1), dtype=tf.int64)
valid_con_mat.update_state(valid_label, valid_pred)
valid_accuracy.update_state(valid_label, valid_pred)
# Log the confusion matrix as an image summary
cm_valid = valid_con_mat.result()
figure = plot_confusion_matrix(cm_valid, class_names=class_names)
cm_valid_image = plot_to_image(figure)
with summary_writer.as_default():
tf.summary.scalar('Valid Accuracy',
valid_accuracy.result(),
step=epoch)
tf.summary.image('Valid ConfusionMatrix',
cm_valid_image,
step=epoch)
end = time()
logging.info(
"Epoch {:d} Training Accuracy: {:.3%} Validation Accuracy: {:.3%} Time:{:.5}s"
.format(epoch + 1, train_accuracy.result(),
valid_accuracy.result(), (end - begin)))
train_accuracy.reset_states()
valid_accuracy.reset_states()
valid_con_mat.reset_states()
if not tuning:
if int(ckpt.step) % 5 == 0:
save_path = manager.save()
logging.info('Saved checkpoint for epoch {}: {}'.format(
int(ckpt.step), save_path))
ckpt.step.assign_add(1)
for test_img, test_label, _ in test_set:
test_img = tf.cast(test_img, tf.float32)
test_img = test_img / 255.0
test_pred, _ = model(test_img, training=False)
test_pred = tf.cast(tf.argmax(test_pred, axis=1), dtype=tf.int64)
test_accuracy.update_state(test_label, test_pred)
test_con_mat.update_state(test_label, test_pred)
cm_test = test_con_mat.result()
# Log the confusion matrix as an image summary
figure = plot_confusion_matrix(cm_test, class_names=class_names)
cm_test_image = plot_to_image(figure)
with summary_writer.as_default():
tf.summary.scalar('Test Accuracy', test_accuracy.result(), step=epoch)
tf.summary.image('Test ConfusionMatrix', cm_test_image, step=epoch)
logging.info("Trained finished. Final Accuracy in test set: {:.3%}".format(
test_accuracy.result()))
# Visualization
if not tuning:
for vis_img, vis_label, vis_name in test_set:
vis_label = vis_label[0]
vis_name = vis_name[0]
vis_img = tf.cast(vis_img[0], tf.float32)
vis_img = tf.expand_dims(vis_img, axis=0)
vis_img = vis_img / 255.0
with tf.GradientTape() as tape:
vis_pred, conv_output = model(vis_img, training=False)
pred_label = tf.argmax(vis_pred, axis=-1)
vis_pred = tf.reduce_max(vis_pred, axis=-1)
grad_1 = tape.gradient(vis_pred, conv_output)
weight = tf.reduce_mean(grad_1, axis=[1, 2]) / grad_1.shape[1]
act_map0 = tf.nn.relu(
tf.reduce_sum(weight * conv_output, axis=-1))
act_map0 = tf.squeeze(tf.image.resize(tf.expand_dims(act_map0,
axis=-1),
(256, 256),
antialias=True),
axis=-1)
plot_map(vis_img, act_map0, vis_pred, pred_label, vis_label,
vis_name)
break
return test_accuracy.result()
def train(unit, dropout, learning_rate, num_epoch, tuning=True):
num_epoch = int(num_epoch)
log_dir = './results/'
# Load dataset
path = os.getcwd()
train_file = path + '/hapt_tfrecords/hapt_train.tfrecords'
val_file = path + '/hapt_tfrecords/hapt_val.tfrecords'
test_file = path + '/hapt_tfrecords/hapt_test.tfrecords'
train_dataset = make_dataset(train_file, overlap=True)
val_dataset = make_dataset(val_file)
test_dataset = make_dataset(test_file)
class_names = [
'WALKING', 'WALKING_UPSTAIRS', 'WALKING_DOWNSTAIRS', 'SITTING',
'STANDING', 'LAYING', 'STAND_TO_SIT', 'SIT_TO_STAND', ' SIT_TO_LIE',
'LIE_TO_SIT', 'STAND_TO_LIE', 'LIE_TO_STAND'
]
# set a random batch number to visualize the result in test dataset.
len_test = len(list(test_dataset))
show_index = random.randint(10, len_test)
# Model
model = Lstm(unit=unit, drop_out=dropout)
# set optimizer
optimizer = tf.keras.optimizers.Adam(learning_rate=learning_rate)
# set Metrics
train_accuracy = tf.keras.metrics.CategoricalAccuracy()
val_accuracy = tf.keras.metrics.Accuracy()
val_con_mat = ConfusionMatrix(num_class=13)
test_accuracy = tf.keras.metrics.Accuracy()
test_con_mat = ConfusionMatrix(num_class=13)
# Save Checkpoint
if not tuning:
ckpt = tf.train.Checkpoint(step=tf.Variable(1),
optimizer=optimizer,
net=model)
manager = tf.train.CheckpointManager(ckpt, './tf_ckpts', max_to_keep=5)
# Set up summary writers
current_time = datetime.datetime.now().strftime("%Y%m%d-%H%M%S")
tb_log_dir = log_dir + current_time
summary_writer = tf.summary.create_file_writer(tb_log_dir)
# Restore Checkpoint
if not tuning:
ckpt.restore(manager.latest_checkpoint)
if manager.latest_checkpoint:
logging.info('Restored from {}'.format(manager.latest_checkpoint))
else:
logging.info('Initializing from scratch.')
# calculate losses, update network and metrics.
@tf.function
def train_step(inputs, label):
# Optimize the model
loss_value, grads = grad(model, inputs, label)
optimizer.apply_gradients(zip(grads, model.trainable_variables))
train_pred = model(inputs, training=True)
train_pred = tf.squeeze(train_pred)
label = tf.squeeze(label)
train_accuracy.update_state(label,
train_pred,
sample_weight=sample_weight)
for epoch in range(num_epoch):
begin = time()
# Training loop
for exp_num, index, label, train_inputs in train_dataset:
train_inputs = tf.expand_dims(train_inputs, axis=0)
# One-hot coding is applied.
label = label - 1
sample_weight = tf.cast(tf.math.not_equal(label, -1), tf.int64)
label = tf.expand_dims(tf.one_hot(label, depth=12), axis=0)
train_step(train_inputs, label)
for exp_num, index, label, val_inputs in val_dataset:
val_inputs = tf.expand_dims(val_inputs, axis=0)
sample_weight = tf.cast(
tf.math.not_equal(label, tf.constant(0, dtype=tf.int64)),
tf.int64)
val_pred = model(val_inputs, training=False)
val_pred = tf.squeeze(val_pred)
val_pred = tf.cast(tf.argmax(val_pred, axis=1), dtype=tf.int64) + 1
val_con_mat.update_state(label,
val_pred,
sample_weight=sample_weight)
val_accuracy.update_state(label,
val_pred,
sample_weight=sample_weight)
# Log the confusion matrix as an image summary
cm_valid = val_con_mat.result()
figure = plot_confusion_matrix(cm_valid, class_names=class_names)
cm_valid_image = plot_to_image(figure)
with summary_writer.as_default():
tf.summary.scalar('Train Accuracy',
train_accuracy.result(),
step=epoch)
tf.summary.scalar('Valid Accuracy',
val_accuracy.result(),
step=epoch)
tf.summary.image('Valid ConfusionMatrix',
cm_valid_image,
step=epoch)
end = time()
logging.info(
"Epoch {:d} Training Accuracy: {:.3%} Validation Accuracy: {:.3%} Time:{:.5}s"
.format(epoch + 1, train_accuracy.result(), val_accuracy.result(),
(end - begin)))
train_accuracy.reset_states()
val_accuracy.reset_states()
val_con_mat.reset_states()
if not tuning:
if int(ckpt.step) % 5 == 0:
save_path = manager.save()
logging.info('Saved checkpoint for epoch {}: {}'.format(
int(ckpt.step), save_path))
ckpt.step.assign_add(1)
i = 0
for exp_num, index, label, test_inputs in test_dataset:
test_inputs = tf.expand_dims(test_inputs, axis=0)
sample_weight = tf.cast(
tf.math.not_equal(label, tf.constant(0, dtype=tf.int64)), tf.int64)
test_pred = model(test_inputs, training=False)
test_pred = tf.cast(tf.argmax(test_pred, axis=2), dtype=tf.int64)
test_pred = tf.squeeze(test_pred, axis=0) + 1
test_accuracy.update_state(label,
test_pred,
sample_weight=sample_weight)
test_con_mat.update_state(label,
test_pred,
sample_weight=sample_weight)
i += 1
# visualize the result
if i == show_index:
if not tuning:
visualization_path = path + '/visualization/'
image_path = visualization_path + current_time + '.png'
inputs = tf.squeeze(test_inputs)
show(index, label, inputs, test_pred, image_path)
# Log the confusion matrix as an image summary
cm_test = test_con_mat.result()
figure = plot_confusion_matrix(cm_test, class_names=class_names)
cm_test_image = plot_to_image(figure)
with summary_writer.as_default():
tf.summary.scalar('Test Accuracy', test_accuracy.result(), step=epoch)
tf.summary.image('Test ConfusionMatrix', cm_test_image, step=epoch)
logging.info("Trained finished. Final Accuracy in test set: {:.3%}".format(
test_accuracy.result()))
return test_accuracy.result()