def predict(self, x, batch_size=512):
'''Model prediction
Args:
x (ndarray): input image of shape (m, hi, wi, ci).
Where m: number of records. hi, wi: height and width of input image.
ci: channels of input image.
Returns:
yhat (ndarray): input with shape (m, k). k is the number of output units,
m is the number of records.
'''
n = len(x)
x = force4D(x)
# do prediction in batches as the vectorized convolution inflates memory
# usage considerably.
yhat = []
batches = getBatch(n, batch_size)
for idxii in batches:
xii = np.take(x, idxii, axis=0)
_, activations = self.feedForward(xii)
yhatii = activations[self.n_layers]
yhat.append(yhatii)
return np.concatenate(yhat, axis=0)
def evaluate(model, loss_func, dictionary, data):
"""evaluate the model while training"""
model.eval() # turn on the eval() switch to disable dropout
total_loss = 0
total_correct = 0
####3
total_prediction = []
total_labels = []
for texts, labels, masks, bsz in utils.getBatch(data=data,
dictionary=dictionary,
maxlen=MAX_LEN,
batch_size=BATCH_SIZE):
hidden = model.init_hidden(texts.size(0))
fc, outh, pred, attention = model.forward(texts, masks, hidden)
output_flat = pred.view(texts.size(0), -1)
total_loss += loss_func(output_flat, labels).data
prediction = torch.max(output_flat, 1)[1]
total_correct += torch.sum((prediction == labels).float())
total_prediction += list(prediction)
total_labels += list(labels)
res = classification_report(total_labels, total_prediction)
return res, total_loss[0] / (len(data) //
BATCH_SIZE), total_correct.data[0] / len(data)
def batchTrain(self, x, y, epochs, batch_size):
'''Training using mini batches
Args:
x (ndarray): input image of shape (m, hi, wi, ci).
Where m: number of records. hi, wi: height and width of input image.
ci: channels of input image.
y (ndarray): input with shape (m, k). k is the number of output units,
m is the number of records.
epochs (int): number of epochs to train.
batch_size (int): mini-batch size.
Returns:
costs (ndarray): overall cost at each epoch.
'''
costs = []
m = len(x)
x = force4D(x)
for ee in range(epochs):
batches = getBatch(m, batch_size, randomize=True)
for idxii in batches:
xii = np.take(x, idxii, axis=0)
yii = np.take(y, idxii, axis=0)
weight_sums, activations = self.feedForward(xii)
gradsii, grads_biasii = self.feedBackward(weight_sums, activations, yii)
self.gradientDescent(gradsii, grads_biasii, batch_size)
je = self.evaluateCost(x, y)
print('# <batchTrain>: cost at epoch %d, j = %f' % (ee, je))
costs.append(je)
return np.array(costs)
def train(model, loss_func, dictionary, epoch, train_data, dev_data,
identity_mat, stop_counter):
global best_dev_loss, best_acc
model.train()
total_loss = 0
for texts, labels, masks, bsz in utils.getBatch(data=train_data,
dictionary=dictionary,
maxlen=MAX_LEN,
batch_size=BATCH_SIZE):
init_state = model.init_hidden(bsz)
fc, outh, pred, attention = model.forward(sents=texts,
mask=masks,
init_hc=init_state)
loss = loss_func(pred.view(texts.size(0), -1), labels)
if USE_ATTENTION:
attentionT = torch.transpose(attention, 1, 2).contiguous()
extra_loss = Frobenius(
torch.bmm(attention, attentionT) -
identity_mat[:attention.size(0)])
loss += PENALIZATION_COEFF * extra_loss
optimizer.zero_grad()
loss.backward()
nn.utils.clip_grad_norm_(model.parameters(), CLIP)
optimizer.step()
total_loss += loss.data
res, dev_loss, acc = evaluate(model, loss_func, dictionary, dev_data)
print(res)
utils.saveLog(LOG_PATH, res)
total_res = 'epoch: %d, dev loss: %f, acc: %f' % (epoch + 1, dev_loss, acc)
print(total_res)
utils.saveLog(LOG_PATH, total_res)
utils.div('-')
if not best_dev_loss or dev_loss < best_dev_loss:
with open(MODEL_PATH % (dev_loss, acc), 'wb') as f:
torch.save(model, f)
best_dev_loss = dev_loss
stop_counter = 0
else:
for param_group in optimizer.param_groups:
param_group['lr'] = param_group['lr'] * 0.2
if EARLY_STOP != 0:
stop_counter += 1
return stop_counter
def batchTrain(self, x, y, epochs, batch_size):
'''Training using mini batches
Args:
x (ndarray): input with shape (n, h, w) or (n, h, w, c).
n is the number of records.
h the image height, w the image width and c the number of channels.
y (ndarray): input with shape (n, m). m is the number of output units,
n is the number of records.
epochs (int): number of epochs to train.
batch_size (int): mini-batch size.
Returns:
self.costs (ndarray): overall cost at each epoch.
'''
costs = []
m = len(x)
for ee in range(epochs):
batches = getBatch(m, batch_size, randomize=True)
for idxjj in batches:
for idxii in idxjj:
xii = np.atleast_3d(x[idxii])
yii = y[idxii]
weight_sums, activations = self.feedForward(xii)
gradsii, grads_biasii = self.feedBackward(
weight_sums, activations, yii)
if idxii == idxjj[0]:
gradsjj = gradsii
grads_biasjj = grads_biasii
else:
gradsjj = self.sumGradients(gradsjj, gradsii)
grads_biasjj = self.sumGradients(
grads_biasjj, grads_biasii)
self.gradientDescent(gradsjj, grads_biasjj, batch_size)
je = self.evaluateCost(x, y)
print('# <batchTrain>: cost at epoch %d, j = %f' % (ee, je))
costs.append(je)
return np.array(costs)
def evaluateCost(self, x, y, batch_size=512):
'''Compute mean cost on a dataset
Args:
x (ndarray): input image of shape (m, hi, wi, ci).
Where m: number of records. hi, wi: height and width of input image.
ci: channels of input image.
y (ndarray): input with shape (m, k). k is the number of output units,
m is the number of records.
Returns:
j (float): mean cost over dataset <x, y>.
'''
j = 0
n = len(x)
batches = getBatch(n, batch_size)
for idxii in batches:
xii = np.take(x, idxii, axis=0)
yii = np.take(y, idxii, axis=0)
yhatii = self.predict(xii, batch_size)
jii = self.sampleCost(yhatii, yii)
j += jii
j2 = self.regCost()
j += j2
return j/n
if use_gpu:
model.cuda()
parameters = model.parameters()
optimizer = torch.optim.Adamax(parameters)
loss_function = torch.nn.MSELoss()
total_len = len(train_dataset)
print("start training...")
for epoch in range(epochs):
start_time = time.time()
total_loss = 0
for i in tqdm(range(0, len(train_dataset) - batch_size, batch_size)):
features, labels = getBatch(train_dataset, i, batch_size)
if use_gpu:
features, labels = features.cuda(), labels.cuda()
model.zero_grad()
output = model(features)
loss = loss_function(output, Variable(labels))
loss.backward()
optimizer.step()
total_loss += loss.item() * len(features)
logger.info(f'epoch:{epoch},train_loss:{total_loss/total_len}')
tf.nn.softmax_cross_entropy_with_logits(logits=prediction, labels=labels))
optimizer = tf.train.AdamOptimizer().minimize(loss)
sess = tf.InteractiveSession()
saver = tf.train.Saver()
sess.run(tf.global_variables_initializer())
tf.summary.scalar('Loss', loss)
tf.summary.scalar('Accuracy', accuracy)
merged = tf.summary.merge_all()
logdir = "tensorboard/" + datetime.datetime.now().strftime(
"%Y%m%d-%H%M%S") + "/"
writer = tf.summary.FileWriter(logdir, sess.graph)
for i in range(NUMBER_OF_ITERATIONS):
nextBatch, nextBatchLabels = getBatch(train, BATCH_SIZE,
MAX_SEQUENCE_LENGTH)
sess.run(optimizer, {input_data: nextBatch, labels: nextBatchLabels})
# Write summary to Tensorboard
if i % 50 == 0:
summary = sess.run(merged, {
input_data: nextBatch,
labels: nextBatchLabels
})
writer.add_summary(summary, i)
# Save the network every 10,000 training iterations
if i % 10000 == 0 and i != 0:
save_path = saver.save(sess,
"models/pretrained_lstm.ckpt",
global_step=i)
from utils import getBatch, calMetric, drawPicture
import torch
if __name__ == "__main__":
test_dataset = pd.read_pickle('dataset/test.pkl')
model_path = 'log/birnn.pt'
model = rnnModel(hidden_dim, feature_dim, batch_size)
model.load_state_dict(torch.load(model_path))
if use_gpu:
model.cuda()
predict = []
ground_truth = []
for i in tqdm(range(0, len(test_dataset) - batch_size, batch_size)):
features, labels = getBatch(test_dataset, i, batch_size)
if use_gpu:
features, labels = features.cuda(), labels.cuda()
model.zero_grad()
output = model(features)
predict.extend(output.data.cpu().numpy())
ground_truth.extend(labels.data.cpu().numpy())
df = pd.DataFrame()
df['predict'] = predict
df['ground_truth'] = ground_truth
df.to_csv("log/result.csv")
def train(model,
x_train,
y_train,
x_validation,
y_validation,
loss_object,
optimizer,
ckpt,
manager,
batch_size=32,
n_epochs=10):
# trying to restore a previous checkpoint. If it fails, starts from scratch
ckpt.restore(manager.latest_checkpoint)
if manager.latest_checkpoint:
print("Restored from {}".format(manager.latest_checkpoint))
else:
print("Initializing from scratch.")
iterations = x_train.shape[0] / batch_size
if x_train.shape[0] % batch_size != 0:
iterations += 1
best_step = -1
best_epoch_val_loss = 100.0
for e in range(n_epochs):
loss_iteration = 0
x_train, y_train = shuffle(x_train, y_train, random_state=0)
total_loss = 0.0
for ibatch in range(int(iterations)):
batch_x = getBatch(x_train, ibatch, batch_size)
batch_y = getBatch(y_train, ibatch, batch_size)
with tf.GradientTape() as tape:
predictions = model(batch_x, training=True)
loss = loss_object(batch_y, predictions)
loss_iteration += loss.numpy()
gradients = tape.gradient(loss, model.trainable_variables)
optimizer.apply_gradients(
zip(gradients, model.trainable_variables))
total_loss = loss_iteration / int(iterations)
pred = model(x_train, training=False)
y_argmax = np.argmax(y_train, axis=1)
pred_argmax = np.argmax(pred, axis=1)
ac = accuracy_score(y_argmax, pred_argmax)
# increment of checkpoint step
ckpt.step.assign_add(1)
if total_loss <= best_epoch_val_loss:
# new best model found, so save the checkpoint into a file
best_epoch_val_loss = total_loss
best_step = int(ckpt.step)
save_path = manager.save()
print("Saved checkpoint for step {}: {}".format(
best_step, save_path))
print("loss {:1.2f}".format(best_epoch_val_loss))
print("epoch %d loss %f Train Accuracy %f" %
(e, total_loss, np.round(ac, 4)))
pred = model(x_validation, training=False)
print("vs. Validation Accuracy %f" % accuracy_score(
np.argmax(y_validation, axis=1), np.argmax(pred, axis=1)))
print("===============")
HIDDEN_SIZE = 300
EPOCH = 3
LEARNING_RATE = 0.001
model = WindowClassifier(len(word2index), EMBEDDING_SIZE, WINDOW_SIZE,
HIDDEN_SIZE, len(tag2index))
print model
if cuda:
model = model.cuda()
loss_function = nn.CrossEntropyLoss()
optimizer = optim.Adam(model.parameters(), lr=LEARNING_RATE)
for ep in range(EPOCH):
losses = []
acc = []
for bid, batch in enumerate(getBatch(BATCH_SIZE, train_data)):
x, y = list(zip(*batch))
inputs = torch.cat(
[prepare_sequence(sent, word2index).view(1, -1) for sent in x])
targets = torch.cat([prepare_tag(tag, tag2index) for tag in y])
model.zero_grad()
# print inputs.size()
pred = model(inputs, istraining=True)
# acc.append(np.where(pred==targets).shape[0])
# print pred
loss = loss_function(pred, targets)
losses.append(loss.data.tolist()[0])
loss.backward()
optimizer.step()
if bid % 1000 == 0:
base = "data/"
readList = open("remaining.txt").read().split()[:50] ##########
batch_size = 64
NUM_EPOCH = 80 # 1200
learning_rate = 0.0003
enc = fontEncoder().cuda()
cla = classifier().cuda()
loss_function = nn.CrossEntropyLoss().cuda()
optimizer = torch.optim.Adam(list(enc.parameters()) + list(cla.parameters()),
lr=learning_rate)
train_set = getBatch(base, readList, BATCH_SIZE=batch_size)
for epoch in range(NUM_EPOCH):
print("current epoch: ", epoch)
for index, (image, label) in enumerate(train_set):
optimizer.zero_grad()
image = image.cuda()
label = label.cuda()
embedding = enc(image)
output = cla(embedding)
loss = loss_function(output, label)
model.add(Dense(input_dim=INPUT_SHAPE, output_dim=150))
model.add(Activation("relu"))
model.add(Dropout(0.50))
model.add(Dense(output_dim=130))
model.add(Activation("relu"))
model.add(Dropout(0.50))
model.add(Dense(output_dim=128))
model.compile("nadam", "mae")
print('Training...')
i = 0
for epoch in range(EPOCHS):
random.seed(42)
random.shuffle(text)
print(' EPOCH:', epoch)
for text_descriptors, img_descriptors in utils.getBatch(
text, images, BATCH_SIZE):
print(vstack(text_descriptors).shape)
""" tmp = list(zip(text_descriptors, img_descriptors))
random.seed(42)
random.shuffle(tmp)
text_descriptors, img_descriptors = zip(*tmp)"""
t0 = time.time()
mlp.partial_fit(vstack(text_descriptors), img_descriptors)
print(' Partial fit {} took: {} min, Score {}'.format(
i, round((time.time() - t0) / 60, 2), mlp.loss_))
"""
mlp.fit(vstack(text_descriptors), img_descriptors)
"""
""" i = i+1
if i == 2: