def training_full(network, batch_size, epochs, loss_fn, optimizer, data, wo,
ho):
train_features, train_labels, val_features, val_labels = data
num_epochs = train_features.shape[0] // batch_size
train_acc = metric.Accuracy()
val_acc = metric.Accuracy()
t = trange(epochs, leave=True)
for e in t:
for i in range(num_epochs):
final_loss = 0
batch_X = mx.nd.array(train_features[i * batch_size:(i + 1) *
batch_size],
ctx=context).astype('float32')
batch_Y = mx.nd.array(train_labels[i * batch_size:(i + 1) *
batch_size],
ctx=context).astype('long')
flag = 0
network, loss = training_step(batch_X, batch_Y, optimizer, loss_fn,
network, wo, ho, batch_size, flag)
final_loss += loss.mean().asscalar()
flag = 1
l, o = training_step(batch_X, batch_Y, optimizer, loss_fn, network,
wo, ho, batch_size, flag)
train_acc.update(l, o)
validation_loss = validate(network, data, wo, ho, loss_fn)
l1, o1 = validate(network, data, wo, ho, loss_fn, flag=1)
val_acc.update(l1, o1)
return network, final_loss, train_acc.get(
)[1], validation_loss, val_acc.get()[1]
def _get_mxnet_metrics(train_config):
metrics_mxnet = [
metric.MSE(name='value_loss',
output_names=['value_output'],
label_names=['value_label']),
metric.CrossEntropy(name='policy_loss',
output_names=['policy_output'],
label_names=['policy_label']),
metric.create(acc_sign,
name='value_acc_sign',
output_names=['value_output'],
label_names=['value_label']),
metric.Accuracy(axis=1,
name='policy_acc',
output_names=['policy_output'],
label_names=['policy_label'])
]
if train_config.use_wdl:
metrics_mxnet.append(
metric.CrossEntropy(name='wdl_loss',
output_names=['wdl_output'],
label_names=['wdl_label']))
metrics_mxnet.append(
metric.Accuracy(axis=1,
name='wdl_acc',
output_names=['wdl_output'],
label_names=['wdl_label']))
if train_config.use_plys_to_end:
metrics_mxnet.append(
metric.MSE(name='plys_to_end_loss',
output_names=['plys_to_end_output'],
label_names=['plys_to_end_label']))
return metrics_mxnet
def _get_gluon_metrics(train_config):
metrics_gluon = {
'value_loss':
metric.MSE(name='value_loss', output_names=['value_output']),
'value_acc_sign':
metric.create(acc_sign,
name='value_acc_sign',
output_names=['value_output'],
label_names=['value_label']),
}
if train_config.sparse_policy_label:
# the default cross entropy only supports sparse labels
metrics_gluon['policy_loss'] = metric.CrossEntropy(
name='policy_loss',
output_names=['policy_output'],
label_names=['policy_label']),
metrics_gluon['policy_acc'] = metric.Accuracy(
axis=1,
name='policy_acc',
output_names=['policy_output'],
label_names=['policy_label'])
else:
metrics_gluon['policy_loss'] = metric.create(
cross_entropy,
name='policy_loss',
output_names=['policy_output'],
label_names=['policy_label'])
metrics_gluon['policy_acc'] = metric.create(
acc_distribution,
name='policy_acc',
output_names=['policy_output'],
label_names=['policy_label'])
return metrics_gluon
def validate(network, validation_dataloader):
"""
Should compute the accuracy of the network on the validation set.
:param network: initialized gluon network to be trained
:type network: gluon.Block
:param validation_dataloader: the training DataLoader provides batches for data for every iteration
:type validation_dataloader: gluon.data.DataLoader
:return: validation accuracy
:rtype: float
"""
# YOUR CODE HERE
# raise NotImplementedError()
validation_accuracy = metric.Accuracy()
# validation loop
for data, label in validation_dataloader:
output = network(data)
validation_accuracy.update(label, output)
validation_accuracy = validation_accuracy.get()[1]
return validation_accuracy
def validate(net, val_data, ctx, loss, plot=False):
metric = mtc.Accuracy()
val_loss = 0
ebs = []
lbs = []
for i, batch in enumerate(val_data):
data = gluon.utils.split_and_load(batch[0],
ctx_list=ctx,
batch_axis=0,
even_split=False)
labels = gluon.utils.split_and_load(batch[1],
ctx_list=ctx,
batch_axis=0,
even_split=False)
ots = [net(X) for X in data]
embedds = [ot[0] for ot in ots]
outputs = [ot[1] for ot in ots]
losses = [loss(yhat, y) for yhat, y in zip(outputs, labels)]
metric.update(labels, outputs)
val_loss += sum([l.mean().asscalar() for l in losses]) / len(losses)
if plot:
for es, ls in zip(embedds, labels):
assert len(es) == len(ls)
for idx in range(len(es)):
ebs.append(es[idx].asnumpy())
lbs.append(ls[idx].asscalar())
if plot:
ebs = np.vstack(ebs)
lbs = np.hstack(lbs)
_, val_acc = metric.get()
return val_acc, val_loss / len(val_data), ebs, lbs
def train(network, training_dataloader, batch_size, epochs):
# Define training metrics
train_acc = metric.Accuracy()
#Define parameters needed for training : Optimizer & Learning Rate
trainer = gluon.Trainer(network.collect_params(), 'adam',
{'learning_rate': 0.002})
# Write a training loop to feed forward, do back-propagation
# with the error identified to update the respective weights
for epoch in range(epochs):
train_loss = 0
tic = time()
for data, label in training_dataloader:
with autograd.record():
output = network(data)
loss = loss_fn(output, label)
loss.backward()
trainer.step(batch_size)
train_loss += loss.asnumpy().mean()
train_acc.update(label, output)
# Design to print epoch, loss, accuracy for every iteration
print(
"Epoch(%d) Loss:%.3f Acc:%.3f " %
(epoch, train_loss / len(training_dataloader), train_acc.get()[1]))
return network, train_acc.get()[1]
def test(valid_iter, net, ctx):
val_metric = metric.Accuracy()
for X, y in valid_iter:
X = X.as_in_context(ctx)
y = y.as_in_context(ctx).astype('float32') # 模型的输出是 float32 类型数据
outputs = net(X)
val_metric.update(y, outputs)
return val_metric.get()
def evaluate_accuracy(self, data_iterator, net):
'''Given model and data, the model accuracy will be calculated.'''
acc = metric.Accuracy()
for i, (data, label) in enumerate(data_iterator):
data = data.as_in_context(self.ctx).astype(self.precision)
label = label.as_in_context(self.ctx).astype(self.precision)
output = net(data)
predictions = nd.argmax(output, axis=1)
acc.update(preds=predictions, labels=label)
return acc.get()[1]
def evaluate_mxnet(model, test_data, loss_fn, device):
acc = metric.Accuracy()
total_loss = 0.0
for X, Y in test_data:
X, Y = X.copyto(device), Y.copyto(device)
pred = model(X)
loss = loss_fn(pred, Y)
total_loss += loss.mean().asscalar()
acc.update(preds=pred, labels=Y)
return acc.get()[1], total_loss / len(test_data)
def train_model_mxnet(model,
train_data,
test_data,
device,
epochs=40,
vis_mod=10):
loss_fn = gluon.loss.SoftmaxCrossEntropyLoss()
optimizer = gluon.Trainer(model.collect_params(), 'sgd', {
'learning_rate': 1e-2,
'momentum': 0.5,
'clip_gradient': 5.0
})
train_acc = []
train_loss = []
test_acc = []
test_loss = []
start = time.time()
for epoch in range(epochs):
acc = metric.Accuracy()
total_loss = 0.0
for X, Y in train_data:
X, Y = X.copyto(device), Y.copyto(device)
with autograd.record():
pred = model(X)
loss = loss_fn(pred, Y)
loss.backward()
optimizer.step(batch_size=X.shape[0])
total_loss += loss.mean().asscalar()
acc.update(preds=pred, labels=Y)
train_loss.append(total_loss / len(train_data))
train_acc.append(acc.get()[1])
_test_acc, _test_loss = evaluate_mxnet(model, test_data, loss_fn,
device)
test_acc.append(_test_acc)
test_loss.append(_test_loss)
if (epoch + 1) % vis_mod == 0:
print(f'[Epoch {epoch + 1:3d}] train_acc: {100 * acc.get()[1]:4.2f}% - '\
f'train_loss: {total_loss / len(train_data):6.3f}')
print(f'[Epoch {epoch + 1:3d}] val_acc: {100 * _test_acc:5.2f}% - '\
f'val_loss: {_test_loss:6.3f}')
print(f'Model runtime: {time.time() - start:6.3f}s')
return {
'accuracy': train_acc,
'loss': train_loss,
'test_accuracy': test_acc,
'test_loss': test_loss
}
def train(train_iter):
net = nn.HybridSequential()
with net.name_scope():
net.add(
model.DSOD(32, 6, 32, 1, 1) # 64 6 48 1 1
)
net.initialize()
box_loss = SmoothL1Loss()
cls_loss = FocalLoss() # hard neg mining vs FocalLoss()
l1_loss = gluon.loss.L1Loss()
net.collect_params().reset_ctx(ctx)
trainer = gluon.Trainer(net.collect_params(),
'sgd', {'learning_rate': 0.1, 'wd': 5e-4})
cls_metric = metric.Accuracy()
box_metric = metric.MAE()
filename = args.params
if args.retrain:
print('load last time weighting')
net.load_params(filename, ctx=mx.gpu())
for epoch in range(args.epoch):
train_data.reset()
cls_metric.reset()
box_metric.reset()
tic = time.time()
for i, batch in enumerate(train_data):
x = batch.data[0].as_in_context(ctx)
y = batch.label[0].as_in_context(ctx)
with mx.autograd.record():
anchors, class_preds, box_preds = net(x)
box_target, box_mask, cls_target = training_targets(anchors, class_preds, y)
loss1 = cls_loss(class_preds, cls_target)
loss2 = l1_loss(box_preds, box_target, box_mask)
loss = loss1 + 5 * loss2
loss.backward()
trainer.step(batch_size)
cls_metric.update([cls_target], [class_preds.transpose((0, 2, 1))])
box_metric.update([box_target], [box_preds * box_mask])
print('Epoch %2d, train %s %.2f, %s %.5f, time %.1f sec' % (
epoch, *cls_metric.get(), *box_metric.get(), time.time() - tic))
net.save_params(filename)
def eval_model(features, labels):
l_sum = 0
l_n = 0
accuracy = metric.Accuracy()
for i in range(features.shape[0] // batch_size):
X = features[i * batch_size:(i + 1) * batch_size].as_in_context(ctx).T
y = labels[i * batch_size:(i + 1) * batch_size].as_in_context(ctx).T
output = net(X)
l = loss(output, y)
l_sum += l.sum().asscalar()
l_n += l.size
accuracy.update(preds=nd.argmax(output, axis=1), labels=y)
return l_sum / l_n, accuracy.get()[1]
def train(network, training_dataloader, batch_size, epochs):
"""
Should take an initialized network and train that network using data from the data loader.
:param network: initialized gluon network to be trained
:type network: gluon.Block
:param training_dataloader: the training DataLoader provides batches for data for every iteration
:type training_dataloader: gluon.data.DataLoader
:param batch_size: batch size for the DataLoader.
:type batch_size: int
:param epochs: number of epochs to train the DataLoader
:type epochs: int
:return: tuple of trained network and the final training accuracy
:rtype: (gluon.Block, float)
"""
loss_fn = gluon.loss.SoftmaxCrossEntropyLoss()
train_accuracy = metric.Accuracy()
trainer = gluon.Trainer(net.collect_params(), 'adam',
{'learning_rate': 0.002})
for epoch in range(epochs):
train_loss = 0.
tic = time()
for data, label in training_dataloader:
with autograd.record():
output = network(data)
loss = loss_fn(output, label)
loss.backward()
trainer.step(batch_size)
train_loss += loss.mean().asscalar()
train_accuracy.update(label, output)
print("Epoch(%d) Loss:%.3f Acc:%.3f Perf: %.1f img/sec" %
(epoch, train_loss / len(training_dataloader),
train_accuracy.get()[1], len(training_dataloader) /
(time() - tic)))
network.save_parameters("trained_net.params")
network = network
training_accuracy = train_accuracy.get()[1]
#raise NotImplementedError()
return network, training_accuracy
def train(network, training_dataloader, batch_size, epochs):
"""
Should take an initialized network and train that network using data from the data loader.
:param network: initialized gluon network to be trained
:type network: gluon.Block
:param training_dataloader: the training DataLoader provides batches for data for every iteration
:type training_dataloader: gluon.data.DataLoader
:param batch_size: batch size for the DataLoader.
:type batch_size: int
:param epochs: number of epochs to train the DataLoader
:type epochs: int
:return: tuple of trained network and the final training accuracy
:rtype: (gluon.Block, float)
"""
# YOUR CODE HERE
# raise NotImplementedError()
# we have:
# network,
# training_dataloader,
# batch_size,
# epochs
# create:
# loss function
# metric accumulator
# trainer (adam)
# training loop
loss_fn = gluon.loss.SoftmaxCrossEntropyLoss()
train_acc = metric.Accuracy()
trainer = gluon.Trainer(network.collect_params(), 'adam', { 'learning_rate' : 0.002 })
for epoch in range(epochs):
for data, label in training_dataloader:
with autograd.record():
output = network(data)
loss = loss_fn(output, label)
loss.backward()
trainer.step(batch_size)
train_acc.update(label, output)
training_accuracy = train_acc.get()[1]
print(training_accuracy)
return network, training_accuracy
def train(ctx,
loss,
trainer,
datasetName,
modelName,
net,
train_iter,
valid_iter,
num_epochs,
n_retrain_epoch=0):
'''
n_retrain_epoch 是从第 n_retrain_epoch 次开始训练模型
'''
train_metric = metric.Accuracy()
train_history = TrainingHistory(['training-error', 'validation-error'])
best_val_score = 0
modelDir, resultDir = get_result_dirs(datasetName)
for epoch in range(num_epochs):
train_l_batch, start = 0.0, time.time() # 计时开始
train_metric.reset()
for X, y in train_iter:
X = X.as_in_context(ctx)
y = y.as_in_context(ctx).astype('float32') # 模型的输出是 float32 类型数据
with autograd.record(): # 记录梯度信息
outputs = net(X) # 模型输出
l = loss(outputs, y).mean() # 计算平均损失
l.backward() # 反向传播
trainer.step(1)
train_l_batch += l.asscalar() # 计算该批量的总损失
train_metric.update(y, outputs) # 计算训练精度
_, train_acc = train_metric.get()
time_s = "time {:.2f} sec".format(time.time() - start) # 计时结束
valid_loss = evaluate_loss(valid_iter, net, ctx, loss) # 计算验证集的平均损失
_, val_acc = test(valid_iter, net, ctx) # 计算验证集的精度
epoch_s = (
"epoch {:d}, train loss {:.5f}, valid loss {:.5f}, train acc {:.5f}, valid acc {:.5f}, "
.format(n_retrain_epoch + epoch, train_l_batch, valid_loss,
train_acc, val_acc))
print(epoch_s + time_s)
train_history.update([1 - train_acc, 1 - val_acc]) # 更新图像的纵轴
train_history.plot(
save_path=f'{resultDir}/{modelName}_history.png') # 实时更新图像
if val_acc > best_val_score: # 保存比较好的模型
best_val_score = val_acc
net.save_parameters('{}/{:.4f}-{}-{:d}-best.params'.format(
modelDir, best_val_score, modelName, n_retrain_epoch + epoch))
return train_history
def fit(self, train_gen, test_gen, epochs, print_every, loss_with_softmax,
optimizer):
trainer = gluon.Trainer(params=self.collect_params(),
optimizer=optimizer)
# Initialize some objects for the metrics
acc = metric.Accuracy()
train_acc_records = []
test_acc_records = []
loss_records = []
for e in range(epochs):
for i, (data, label) in enumerate(train_gen):
data = data.as_in_context(self.ctx).astype(self.precision)
label = label.as_in_context(self.ctx).astype(np.float32)
with autograd.record():
label_linear = self.layer(data)
label_linear = label_linear.astype(
np.float32
) # Improve accuracy, as suggested in nVIDIA's SDK.
loss = loss_with_softmax(label_linear, label)
loss.backward()
trainer.step(batch_size=128)
# Print the metrics every several iterations.
if (i % print_every == 0
): # print metrics for train (current batch) & test data.
label_pred = nd.argmax(nd.softmax(label_linear), axis=1)
acc.reset()
acc.update(preds=label_pred, labels=label)
train_acc = acc.get()[1]
test_acc = self.evaluate_accuracy(test_gen, self.layer)
train_acc_records.append(train_acc)
test_acc_records.append(test_acc)
curr_loss = nd.mean(loss).asscalar()
loss_records.append(curr_loss)
print(
"epoch=%2s, iter=%5d, loss=%10f, train acc=%10f, test_acc=%10f"
% (e, i, curr_loss, train_acc, test_acc))
# Visialize the calculated metrics of accuracy during of training.
self.viz_training(train_acc_records, test_acc_records, loss_records)
def calculate_accuracy(network, dataloader):
"""
Calculates accuracy of the network on the data given by the dataloader.
:param network: network to be tested
:type network: mx.gluon.Block
:param dataloader: dataloader for test data
:type dataloader: mx.gluon.data.DataLoader
:return: updated metric
:rtype: mx.metric.EvalMetric
"""
accuracy = metric.Accuracy()
for data, labels in tqdm(dataloader):
preds = network(data)
accuracy.update(labels=labels, preds=preds)
return accuracy
def train_cls_network(inference, train_loader, trainer, cur_epoch, ctx, criterion, log_iter=100):
metric_acc = metric.Accuracy()
metric_loss = metric.Loss()
train_loader.reset()
epoch_start_time = timeit.default_timer()
for cur_batch, batch in enumerate(train_loader):
batch_start_time = timeit.default_timer()
batch_size = batch.data[0].shape[0]
data = gluon.utils.split_and_load(batch.data[0], ctx)
label = gluon.utils.split_and_load(batch.label[0], ctx)
with autograd.record(train_mode=True):
losses = []
for x, y in zip(data, label):
y_hat = inference(x)
loss = criterion(y_hat, y)
losses.append(loss)
metric_loss.update(None, preds=[loss])
metric_acc.update(preds=[y_hat], labels=[y])
for loss in losses:
loss.backward()
trainer.step(batch_size)
if cur_batch % log_iter == 0 and cur_batch > 0:
batch_elpased_time = timeit.default_timer() - batch_start_time
print('Epoch [%d-%d]: Speed: %.2f samples/s \t Accuracy: %.2f \t Loss: %.4f' %
(cur_epoch, cur_batch, batch_elpased_time / batch_size, 100 * metric_acc.get()[1],
metric_loss.get()[1]))
epoch_elapsed_time = timeit.default_timer() - epoch_start_time
logging.info('Epoch [%d]: Accuracy: %.2f' % (cur_epoch, 100 * metric_acc.get()[1]))
logging.info('Epoch [%d]: Loss: %.2f' % (cur_epoch, metric_loss.get()[1]))
logging.info('Epoch [%d]: Elapsed time: %s' % (cur_epoch, str(timedelta(seconds=epoch_elapsed_time))))
return metric_acc.get()[1]
def train(net, loss_fn, train_data, epochs, batch_size):
"""
Should take an initialized network and train that network using data from the data loader.
:param network: initialized gluon network to be trained
:type network: gluon.Block
:param loss_fn: the loss function
:type loss_fn: gluon.Block
:param train_data: the training DataLoader provides batches for data for every iteration
:type train_data: gluon.data.DataLoader
:param epochs: number of epochs to train the DataLoader
:type epochs: int
:param batch_size: batch size for the DataLoader.
:type batch_size: int
:return: tuple of trained network and the final training accuracy
:rtype: (gluon.Block, float)
"""
# YOUR CODE HERE
# raise NotImplementedError()
train_acc = metric.Accuracy()
trainer = gluon.Trainer(net.collect_params(), 'sgd',
{'learning_rate': 0.1})
for epoch in range(epochs):
print(f'epoch: {epoch}')
for data, label in train_data:
with autograd.record():
output = net(data)
loss = loss_fn(output, label)
loss.backward()
trainer.step(batch_size)
train_acc.update(label, output)
print(train_acc.get()[1])
return (net, train_acc.get()[1])
def train_fun():
cls_metric = metric.Accuracy()
box_metric = metric.MAE()
ctx = gpu(0)
train_data, test_data, class_names, num_class = get_iterators(
data_shape, batch_size)
train_data.reshape(label_shape=(3, 5))
train_data = test_data.sync_label_shape(train_data)
net = ToySSD(num_class)
net.initialize(init.Xavier(magnitude=2), ctx=ctx)
net = ToySSD(num_classes=2, verbose=False)
net.initialize(init.Xavier(magnitude=2), ctx=ctx)
trainer = gluon.Trainer(net.collect_params(), 'sgd', {
'learning_rate': 0.1,
'wd': 5e-4
})
import time
from mxnet import autograd
cls_loss = FocalLoss()
box_loss = SmoothL1Loss()
for epoch in range(30):
train_data.reset()
cls_metric.reset()
box_metric.reset()
tic = time.time()
for i, batch in enumerate(train_data):
x = batch.data[0].as_in_context(ctx)
y = batch.label[0].as_in_context(ctx)
with autograd.record():
anchors, class_preds, box_preds = net(x)
box_target, box_mask, cls_target = training_targets(
anchors, class_preds, y)
loss1 = cls_loss(class_preds, cls_target)
loss2 = box_loss(box_preds, box_target, box_mask)
loss = loss1 + loss2
loss.backward()
trainer.step(batch_size)
cls_metric.update([cls_target], [class_preds.transpose((0, 2, 1))])
box_metric.update([box_target], [box_preds * box_mask])
print('epoch %2d, train %s %.2f, %s %.5f, time %.1f sec' %
(epoch, *cls_metric.get(), *box_metric.get(), time.time() - tic))
def evaluate(data_loader, data_len, model, loss, ctx):
"""
Evaluation, return accuracy and loss
"""
total_loss = 0.0
acc = metric.Accuracy()
for data, label in data_loader:
data, label = data.as_in_context(ctx), label.as_in_context(ctx)
with autograd.record(
train_mode=False): # set the training_mode to False
output = model(data)
losses = loss(output, label)
total_loss += nd.sum(losses).asscalar()
predictions = nd.argmax(output, axis=1)
acc.update(preds=predictions, labels=label)
return acc.get()[1], total_loss / data_len
def validate(net, val_data, ctx):
metric = mtc.Accuracy()
cross_entropy = gluon.loss.SoftmaxCrossEntropyLoss()
val_loss = 0
for i, batch in enumerate(val_data):
data = gluon.utils.split_and_load(batch[0],
ctx_list=ctx,
batch_axis=0,
even_split=False)
labels = gluon.utils.split_and_load(batch[1],
ctx_list=ctx,
batch_axis=0,
even_split=False)
outputs = [net(X) for X in data]
loss = [cross_entropy(yhat, y) for yhat, y in zip(outputs, labels)]
metric.update(labels, outputs)
val_loss += sum([l.mean().asscalar() for l in loss]) / len(loss)
_, val_acc = metric.get()
return val_acc, val_loss / len(val_data)
def evaluate(network, dataloader):
"""
Should compute the accuracy of the network on the validation set.
:param network: initialized gluon network to be trained
:type network: gluon.Block
:param dataloader: the validation DataLoader provides batches for data for every iteration
:type dataloader: gluon.data.DataLoader
:return: validation accuracy
:rtype: float
"""
valid_acc = metric.Accuracy()
for data, label in dataloader:
output = network(data)
valid_acc.update(label, output)
#print("Validation acc: %.3f "%(valid_acc.get()[1]))
val_acc = valid_acc.get()[1]
return val_acc
def validate(network, validation_dataloader):
"""
Should compute the accuracy of the network on the validation set.
:param network: initialized gluon network to be trained
:type network: gluon.Block
:param validation_dataloader: the training DataLoader provides batches for data for every iteration
:type validation_dataloader: gluon.data.DataLoader
:return: validation accuracy
:rtype: float
"""
valid_acc = metric.Accuracy()
for data, label in validation_dataloader:
output = network(data)
valid_acc.update(label, output)
print("Validation Acc: %.3f " % (valid_acc.get()[1]))
# raise NotImplementedError()
return valid_acc.get()[1]
def eval_model(features, labels, net, batch_size):
l_sum = 0
l_n = 0
accuracy = metric.Accuracy()
batch_count = features.shape[0] // batch_size
preds_all = None
labels_all = None
for i in range(batch_count):
X = features[i * batch_size:(i + 1) * batch_size].as_in_context(
features.context).T # batch_size * embed_size
y = labels[i * batch_size:(i + 1) * batch_size].as_in_context(
labels.context).T # batch_size * 1
output = net(X)
l = loss(output, y)
l_sum += l.sum().asscalar()
l_n += l.size
preds = nd.argmax(output, axis=1)
accuracy.update(preds=preds, labels=y)
if preds_all is None:
preds_all = preds
preds_all = nd.concat(preds_all, preds, dim=0)
if labels_all is None:
labels_all = y
labels_all = nd.concat(labels_all, y, dim=0)
# tp = nd.sum((preds_all == 1) * (labels_all == 1)).asscalar()
# fp = nd.sum((preds_all == 1) * (labels_all == 0)).asscalar()
# fn = nd.sum((preds_all == 0) * (labels_all == 1)).asscalar()
# precision = float(tp) / (tp + fp)
# recall = float(tp) / (tp + fn)
# f1 = 2 * (precision * recall) / (precision + recall)
return l_sum / l_n, accuracy.get()[1], evaluate(preds_all, labels_all)
box_loss = SmoothL1Loss()
print(box_loss)
train_data.reshape(label_shape=(3, 5))
train_data = test_data.sync_label_shape(train_data)
net = ToySSD(num_class)
net.initialize(init.Xavier(magnitude=2), ctx=ctx)
trainer = gluon.Trainer(net.collect_params(), 'sgd', {
'learning_rate': 0.1,
'wd': 5e-4
})
ctx = utils.try_gpu()
cls_metric = metric.Accuracy()
box_metric = metric.MAE()
for epoch in range(30):
# reset data iterators and metrics
train_data.reset()
cls_metric.reset()
box_metric.reset()
tic = time.time()
for i, batch in enumerate(train_data):
x = batch.data[0].as_in_context(ctx)
y = batch.label[0].as_in_context(ctx)
with autograd.record():
anchors, class_preds, box_preds = net(x)
box_target, box_mask, cls_target = training_targets(
anchors, class_preds, y)
# losses
def update_network(queue, nn_update_idx, symbol_filename, params_filename,
convert_to_onnx, main_config, train_config: TrainConfig,
model_contender_dir):
"""
Creates a new NN checkpoint in the model contender directory after training using the game files stored in the
training directory
:param queue: Queue object used to return items
:param nn_update_idx: Defines how many updates of the nn has already been done. This index should be incremented
after every update.
:param symbol_filename: Architecture definition file
:param params_filename: Weight file which will be loaded before training
Updates the neural network with the newly acquired games from the replay memory
:param convert_to_onnx: Boolean indicating if the network shall be exported to ONNX to allow TensorRT inference
:param main_config: Dict of the main_config (imported from main_config.py)
:param train_config: Dict of the train_config (imported from train_config.py)
:param model_contender_dir: String of the contender directory path
:return: k_steps_final
"""
# set the context on CPU, switch to GPU if there is one available (strongly recommended for training)
ctx = mx.gpu(
train_config.device_id) if train_config.context == "gpu" else mx.cpu()
# set a specific seed value for reproducibility
train_config.nb_parts = len(
glob.glob(main_config["planes_train_dir"] + '**/*.zip'))
logging.info("number parts for training: %d" % train_config.nb_parts)
train_objects = TrainObjects()
if train_config.nb_parts <= 0:
raise Exception(
'No .zip files for training available. Check the path in main_config["planes_train_dir"]:'
' %s' % main_config["planes_train_dir"])
_, x_val, y_val_value, y_val_policy, _, _ = load_pgn_dataset(
dataset_type="val",
part_id=0,
normalize=train_config.normalize,
verbose=False,
q_value_ratio=train_config.q_value_ratio)
y_val_policy = prepare_policy(y_val_policy,
train_config.select_policy_from_plane,
train_config.sparse_policy_label,
train_config.is_policy_from_plane_data)
val_dataset = gluon.data.ArrayDataset(nd.array(x_val),
nd.array(y_val_value),
nd.array(y_val_policy))
val_data = gluon.data.DataLoader(val_dataset,
train_config.batch_size,
shuffle=False,
num_workers=train_config.cpu_count)
symbol = mx.sym.load(symbol_filename)
# calculate how many iterations per epoch exist
nb_it_per_epoch = (len(x_val) *
train_config.nb_parts) // train_config.batch_size
# one iteration is defined by passing 1 batch and doing backprop
train_config.total_it = int(nb_it_per_epoch *
train_config.nb_training_epochs)
train_objects.lr_schedule = CosineAnnealingSchedule(
train_config.min_lr, train_config.max_lr,
max(train_config.total_it * .7, 1))
train_objects.lr_schedule = LinearWarmUp(train_objects.lr_schedule,
start_lr=train_config.min_lr,
length=max(
train_config.total_it * .25,
1))
train_objects.momentum_schedule = MomentumSchedule(
train_objects.lr_schedule, train_config.min_lr, train_config.max_lr,
train_config.min_momentum, train_config.max_momentum)
input_shape = x_val[0].shape
inputs = mx.sym.var('data', dtype='float32')
value_out = symbol.get_internals()[main_config['value_output'] + '_output']
policy_out = symbol.get_internals()[main_config['policy_output'] +
'_output']
sym = mx.symbol.Group([value_out, policy_out])
net = mx.gluon.SymbolBlock(sym, inputs)
net.collect_params().load(params_filename, ctx)
metrics_gluon = {
'value_loss':
metric.MSE(name='value_loss', output_names=['value_output']),
'value_acc_sign':
metric.create(acc_sign,
name='value_acc_sign',
output_names=['value_output'],
label_names=['value_label']),
}
if train_config.sparse_policy_label:
print("train with sparse labels")
# the default cross entropy only supports sparse labels
metrics_gluon['policy_loss'] = metric.CrossEntropy(
name='policy_loss',
output_names=['policy_output'],
label_names=['policy_label']),
metrics_gluon['policy_acc'] = metric.Accuracy(
axis=1,
name='policy_acc',
output_names=['policy_output'],
label_names=['policy_label'])
else:
metrics_gluon['policy_loss'] = metric.create(
cross_entropy,
name='policy_loss',
output_names=['policy_output'],
label_names=['policy_label'])
metrics_gluon['policy_acc'] = metric.create(
acc_distribution,
name='policy_acc',
output_names=['policy_output'],
label_names=['policy_label'])
train_objects.metrics = metrics_gluon
train_config.export_weights = False # don't save intermediate weights
train_agent = TrainerAgent(net,
val_data,
train_config,
train_objects,
use_rtpt=False)
# iteration counter used for the momentum and learning rate schedule
cur_it = train_config.k_steps_initial * train_config.batch_steps
(k_steps_final, val_value_loss_final, val_policy_loss_final,
val_value_acc_sign_final,
val_policy_acc_final), _ = train_agent.train(cur_it)
prefix = "%smodel-%.5f-%.5f-%.3f-%.3f" % (
model_contender_dir, val_value_loss_final, val_policy_loss_final,
val_value_acc_sign_final, val_policy_acc_final)
sym_file = prefix + "-symbol.json"
params_file = prefix + "-" + "%04d.params" % nn_update_idx
# the export function saves both the architecture and the weights
net.export(prefix, epoch=nn_update_idx)
print()
logging.info("Saved checkpoint to %s-%04d.params", prefix, nn_update_idx)
if convert_to_onnx:
convert_mxnet_model_to_onnx(sym_file, params_file,
["value_out_output", "policy_out_output"],
input_shape, [1, 8, 16], False)
logging.info("k_steps_final %d" % k_steps_final)
queue.put(k_steps_final)
train=True).transform_first(mnist_transformer),
batch_size=batch_size,
shuffle=False)
mnist_net = MNistHybrid(no_class=no_class)
# if we set verbose - the printed numbers will be a lot finer
mnist_net.collect_params().initialize(init=mx.init.Xavier(),
force_reinit=True,
verbose=False,
ctx=ctx)
trainer = mx.gluon.Trainer(params=mnist_net.collect_params(),
optimizer="sgd",
optimizer_params={"learning_rate": lr})
loss_fun = mx.gluon.loss.SoftmaxCrossEntropyLoss()
train_accuracy = metric.Accuracy()
test_accuracy = metric.Accuracy()
ninv_train = 1 / len(train_data)
ninv_test = 1 / len(test_data)
# reshaped as batch, no_channel, w, h
sample_1 = mx.gluon.data.vision.MNIST(train=True)[0][0].reshape((1, 1, 28, 28))
plt.imshow(sample_1.asnumpy().reshape((28, 28)), cmap='gray')
plt.show()
if do_train:
for a_epoch in range(epochs):
train_loss, f_train_acc, f_val_acc = .0, .0, .0
tic = time()
for a_batch in train_data:
def run_training(alpha, queue):
_, x_val, yv_val, yp_val, plys_to_end, _ = load_pgn_dataset(
dataset_type='val', part_id=0, verbose=True, normalize=tc.normalize)
if tc.discount != 1:
yv_val *= tc.discount**plys_to_end
if tc.select_policy_from_plane:
val_iter = mx.io.NDArrayIter(
{'data': x_val}, {
'value_label': yv_val,
'policy_label': np.array(FLAT_PLANE_IDX)[yp_val.argmax(axis=1)]
}, tc.batch_size)
else:
val_iter = mx.io.NDArrayIter({'data': x_val}, {
'value_label': yv_val,
'policy_label': yp_val.argmax(axis=1)
}, tc.batch_size)
tc.nb_parts = len(glob.glob(main_config['planes_train_dir'] + '**/*'))
nb_it_per_epoch = (
len(x_val) * tc.nb_parts
) // tc.batch_size # calculate how many iterations per epoch exist
# one iteration is defined by passing 1 batch and doing backprop
tc.total_it = int(nb_it_per_epoch * tc.nb_training_epochs)
### Define a Learning Rate schedule
to.lr_schedule = OneCycleSchedule(start_lr=tc.max_lr / 8,
max_lr=tc.max_lr,
cycle_length=tc.total_it * .3,
cooldown_length=tc.total_it * .6,
finish_lr=tc.min_lr)
to.lr_schedule = LinearWarmUp(to.lr_schedule,
start_lr=tc.min_lr,
length=tc.total_it / 30)
### Momentum schedule
to.momentum_schedule = MomentumSchedule(to.lr_schedule, tc.min_lr,
tc.max_lr, tc.min_momentum,
tc.max_momentum)
plot_schedule(to.momentum_schedule,
iterations=tc.total_it,
ylabel='Momentum')
input_shape = x_val[0].shape
beta = np.sqrt(2 / alpha)
print("alpha:", alpha)
print("beta:", beta)
depth = int(round(base_depth * alpha))
channels = int(round(base_channels * beta))
kernels = [3] * depth
se_types = [None] * len(kernels)
channels_reduced = int(round(channels / 4))
symbol = rise_mobile_v3_symbol(channels=channels,
channels_operating_init=channels_reduced,
act_type='relu',
channels_value_head=8,
value_fc_size=256,
channels_policy_head=NB_POLICY_MAP_CHANNELS,
grad_scale_value=tc.val_loss_factor,
grad_scale_policy=tc.policy_loss_factor,
dropout_rate=tc.dropout_rate,
select_policy_from_plane=True,
kernels=kernels,
se_types=se_types)
# create a trainable module on compute context
model = mx.mod.Module(symbol=symbol,
context=ctx,
label_names=['value_label', 'policy_label'])
model.bind(for_training=True,
data_shapes=[('data', (tc.batch_size, input_shape[0],
input_shape[1], input_shape[2]))],
label_shapes=val_iter.provide_label)
model.init_params(
mx.initializer.Xavier(rnd_type='uniform',
factor_type='avg',
magnitude=2.24))
metrics_mxnet = [
metric.MSE(name='value_loss',
output_names=['value_output'],
label_names=['value_label']),
metric.CrossEntropy(name='policy_loss',
output_names=['policy_output'],
label_names=['policy_label']),
metric.create(acc_sign,
name='value_acc_sign',
output_names=['value_output'],
label_names=['value_label']),
metric.Accuracy(axis=1,
name='policy_acc',
output_names=['policy_output'],
label_names=['policy_label'])
]
to.metrics = metrics_mxnet
train_agent = TrainerAgentMXNET(model,
symbol,
val_iter,
tc,
to,
use_rtpt=True)
print("model.score(val_iter, to.metrics:",
model.score(val_iter, to.metrics))
# Start the training process
_, (k_steps_best, val_metric_values_best) = train_agent.train(cur_it)
new_row = {
'alpha': alpha,
'beta': beta,
'depth': depth,
'channels': channels,
'k_steps_best': k_steps_best,
'val_loss': val_metric_values_best['loss'],
'val_value_loss': val_metric_values_best['value_loss'],
'val_policy_loss': val_metric_values_best['policy_loss'],
'val_policy_acc': val_metric_values_best['policy_acc'],
'val_value_acc': val_metric_values_best['value_acc_sign']
}
queue.put(new_row)
print(new_row)
def __init__(self, args):
super(Trainer, self).__init__()
self.args = args
self.experiment_dir = args.experiment_dir
if not osp.exists(self.experiment_dir):
os.makedirs(self.experiment_dir)
print("The experiment dir has been created:{}".format(
self.experiment_dir))
self.trainer_log = TrainerLog(args=args, append=True)
self.ctx = set_ctx(args=args)
self.check_point = CheckPoint(args=args,
trainer_log=self.trainer_log,
ctx=self.ctx)
self.train_loader, self.test_loader = dataloader(args=args)
self.lr_scheduler = None
self.optimizer = None
self.model = None
if self.train_loader is not None:
self.train_samples_num = self.train_loader._dataset.__len__()
print("train dataset samples: {}".format(self.train_samples_num))
self.test_samples_num = self.test_loader._dataset.__len__()
print("test dataset samples: {}".format(self.test_samples_num))
self.resume_epoch = 0
if args.only_test is False:
if args.use_tensorboard is True:
from tensorboardX import SummaryWriter
self.tb_writer = SummaryWriter(
log_dir=osp.join(args.experiment_dir, 'tensorboard'))
else:
self.tb_writer = None
if args.resume is True:
self.checkpoint_epoch = args.checkpoint_epoch
self.model = get_networks(args=args, ctx=self.ctx)
self.resume_epoch = self.check_point.load_checkpoint_parameters(
epoch=self.checkpoint_epoch, model=self.model)
else:
self.model = get_networks(args=args, ctx=self.ctx)
self.model.classifier.initialize(ctx=self.ctx)
self.lr_scheduler = get_lr_scheduler(
args=args, train_loader=self.train_loader)
self.optimizer, self.trainer = set_optimizer(
model=self.model, lr_scheduler=self.lr_scheduler, args=args)
self.loss_functions = set_loss(args=args, tb_writer=self.tb_writer)
self.current_epoch = None
elif args.only_test is True:
self.checkpoint_epoch = args.checkpoint_epoch
self.model = get_networks(args=args, ctx=self.ctx)
self.epoch_test = args.epoch_test
_ = self.check_point.load_checkpoint_parameters(
epoch=self.checkpoint_epoch,
model=self.model,
epoch_test=self.epoch_test)
if self.lr_scheduler is not None:
self.trainer_log.print_use_lr_scheduler()
if self.optimizer is not None and self.trainer is not None:
self.trainer_log.print_use_optimizer()
if self.model is not None:
self.trainer_log.print_use_network()
self.test_accuracy_metric = metric.Accuracy()
self.epochs = args.epochs
self.train_total = 0
self.best_accuracy = None
self.current_accuracy = None