def update_metrics(raw_metrics,
input_mu,
input_sigma,
sample_mu,
labels,
predict_start,
samples=None,
relative=False):
raw_metrics['ND'] = raw_metrics['ND'] + net.accuracy_ND(
sample_mu, labels[:, predict_start:], relative=relative)
raw_metrics['RMSE'] = raw_metrics['RMSE'] + net.accuracy_RMSE(
sample_mu, labels[:, predict_start:], relative=relative)
input_time_steps = input_mu.numel()
raw_metrics['test_loss'] = raw_metrics['test_loss'] + [
net.loss_fn(input_mu, input_sigma, labels[:, :predict_start]) *
input_time_steps, input_time_steps
]
if samples is not None:
raw_metrics['rou90'] = raw_metrics['rou90'] + net.accuracy_ROU(
0.9, samples, labels[:, predict_start:], relative=relative)
raw_metrics['rou50'] = raw_metrics['rou50'] + net.accuracy_ROU(
0.5, samples, labels[:, predict_start:], relative=relative)
raw_metrics['rou10'] = raw_metrics['rou10'] + net.accuracy_ROU(
0.1, samples, labels[:, predict_start:], relative=relative)
return raw_metrics
def test_every_layer_updated_after_training(Net, fetch_train_batch):
""" check model parameters are updated after one batch training """
# configure Adam optimizer; use a large lr
optimizer = optim.Adam(Net.parameters(), lr=10)
# make a copy of network parameters before training
before = [t.clone() for t in list(Net.parameters())]
# do training on one batch
images, labels = fetch_train_batch
outputs = Net(images)
optimizer.zero_grad()
loss = net.loss_fn(outputs, labels)
loss.backward()
optimizer.step()
# make a copy of network parameter after training
after = [t.clone() for t in list(Net.parameters())]
# assert that any elements in the weights are updated by training
for i in range(len(before)):
assert (before[i] !=
after[i]).any(), "- layer {} not updated".format(i + 1)
def train(data, model, optimizer, storage, args, params, epoch):
print("training epoch {}".format(epoch), end="")
x = Variable(data["x"])
l = Variable(data["target"])
out = model(x)
out_z = out["z"]
if params.use_weights:
out_w = out["w"]
else:
out_w = torch.ones_like(l)
if (epoch == 1) or (epoch % params.c_update_interval == 0):
print(" updating centres".format(epoch), end="")
c = Variable(out["z"])
storage["c"] = c
else:
# TODO find a way to get this c into global scope between training iterations
c = storage["c"]
model.train()
loss = torch.zeros((1, ))
for i in torch.arange(x.shape[0]):
include = np.delete(np.arange(x.shape[0]), i)
# p = get_class_probs(out_z[i,:], c[include,:], l[include], out_w[include], params)
p = get_class_probs(out_z[i, :], c[include, :], l[include], None,
params)
loss += loss_fn(p, l[i], params)
print(", loss: {}".format(loss.item()))
optimizer.zero_grad()
loss.backward()
optimizer.step()
def evaluate(model, loss_fn, dataloader, metrics, params):
"""Evaluate the model on `num_steps` batches.
Args:
model: (torch.nn.Module) the neural network
loss_fn: a function that takes batch_output and batch_labels and computes the loss for the batch
dataloader: (DataLoader) a torch.utils.data.DataLoader object that fetches data
metrics: (dict) a dictionary of functions that compute a metric using the output and labels of each batch
params: (Params) hyper parameters
"""
# set model to evaluation mode
model.eval()
# summary for current eval loop
summ = []
# compute metrics over the dataset
for i, (highlight_batch, non_highlight_batch, text_feature_batch,
user_history_batch) in enumerate(dataloader):
highlight_batch = highlight_batch.reshape(highlight_batch.shape[0],
-1).float()
non_highlight_batch = non_highlight_batch.reshape(
non_highlight_batch.shape[0], -1).float()
user_history_batch = user_history_batch.reshape(
user_history_batch.shape[0], -1).float()
positive_batch = torch.cat((highlight_batch, user_history_batch),
dim=1)
negative_batch = torch.cat((non_highlight_batch, user_history_batch),
dim=1)
# move to GPU if available
if params.cuda:
positive_batch, negative_batch = positive_batch.cuda(
async=True), negative_batch.cuda(async=True)
device = torch.device("cuda")
positive_batch, negative_batch = Variable(positive_batch), Variable(
negative_batch)
positive_batch_output = model(positive_batch)
negative_batch_output = model(negative_batch)
if params.cuda:
loss = loss_fn(
positive_batch_output, negative_batch_output,
torch.ones(positive_batch.shape[0], 1, device=device))
else:
loss = loss_fn(positive_batch_output, negative_batch_output,
torch.ones(positive_batch.shape[0], 1))
# compute all metrics on this batch
summary_batch = {
metric: metrics[metric](positive_batch_output,
negative_batch_output)
for metric in metrics
}
summary_batch['loss'] = loss.item()
summ.append(summary_batch)
"""
I need to understand this block more.
- Just computing the mean for each matrices in the metrics dictionary from net.py file
"""
# compute mean of all metrics in summary
metrics_mean = {
metric: np.mean([x[metric] for x in summ])
for metric in summ[0]
}
metrics_string = " ; ".join("{}: {:05.3f}".format(k, v)
for k, v in metrics_mean.items())
logging.info("- Eval metrics : " + metrics_string)
return metrics_mean
def compute_loss(fetch_train_batch, train_net_batch):
""" compute the loss """
outputs = train_net_batch
labels = fetch_train_batch[1]
return net.loss_fn(outputs, labels)
def train(model, optimizer, loss_fn, dataloader, metrics, params):
"""Train the model on `num_steps` batches
Args:
model: (torch.nn.Module) the neural network
optimizer: (torch.optim) optimizer for parameters of model
loss_fn: a function that takes batch_output and batch_labels and computes the loss for the batch
dataloader: (DataLoader) a torch.utils.data.DataLoader object that fetches training data
metrics: (dict) a dictionary of functions that compute a metric using the output and labels of each batch
params: (Params) hyperparameters
num_steps: (int) number of batches to train on, each of size params.batch_size
"""
# set model to training mode
model.train()
# summary for current training loop and a running average object for loss
summary = []
loss_over_batch = []
loss_avg = utils.RunningAverage()
for i, (highlight_batch, highlight_distance_batch, non_highlight_batch,
non_highlight_distance_batch,
text_feature_batch) in enumerate(dataloader):
highlight_batch = highlight_batch.reshape(highlight_batch.shape[0],
-1).float()
highlight_distance_batch = highlight_batch.reshape(
highlight_distance_batch.shape[0], -1).float()
non_highlight_batch = non_highlight_batch.reshape(
non_highlight_batch.shape[0], -1).float()
non_highlight_distance_batch = non_highlight_batch.reshape(
non_highlight_distance_batch.shape[0], -1).float()
text_feature_batch = text_feature_batch.reshape(
text_feature_batch.shape[0], -1).float()
positive_batch = torch.cat(
(highlight_batch, highlight_distance_batch, text_feature_batch),
dim=1)
negative_batch = torch.cat(
(non_highlight_batch, non_highlight_distance_batch,
text_feature_batch),
dim=1)
if params.cuda:
positive_batch, negative_batch = positive_batch.cuda(
async=True), negative_batch.cuda(async=True)
device = torch.device("cuda")
positive_batch, negative_batch = Variable(positive_batch), Variable(
negative_batch)
positive_batch_output = model(positive_batch)
negative_batch_output = model(negative_batch)
if params.cuda:
loss = loss_fn(
positive_batch_output, negative_batch_output,
torch.ones(positive_batch.shape[0], 1, device=device))
else:
loss = loss_fn(positive_batch_output, negative_batch_output,
torch.ones(positive_batch.shape[0], 1))
# clear previous gradients, compute gradients of all variables wrt loss
optimizer.zero_grad()
loss.backward()
# performs updates using calculated gradients
optimizer.step()
# Evaluate summaries only once in a while
if i % params.save_summary_steps == 0:
# compute all metrics on this batch
summary_batch = {
metric: metrics[metric](positive_batch_output,
negative_batch_output)
for metric in metrics
}
summary_batch['loss'] = loss.item()
# logging.info("- Batch loss: {}".format(summary_batch['loss']))
summary.append(summary_batch)
loss_over_batch.append(loss.item())
# update the average loss
loss_avg.update(loss.item())
metrics_mean = {
metric: np.mean([x[metric] for x in summary])
for metric in summary[0]
}
metrics_string = " ; ".join("{}: {:05.3f}".format(k, v)
for k, v in metrics_mean.items())
logging.info("- Train metrics: " + metrics_string)
return np.array(loss_over_batch)
