def train(run_id: str, clean_data_root: Path, models_dir: Path,
umap_every: int, save_every: int, backup_every: int, vis_every: int,
force_restart: bool, visdom_server: str, no_visdom: bool):
# Create a dataset and a dataloader
dataset = SpeakerVerificationDataset(clean_data_root)
loader = SpeakerVerificationDataLoader(
dataset,
speakers_per_batch,
utterances_per_speaker,
num_workers=8,
)
# Setup the device on which to run the forward pass and the loss. These can be different,
# because the forward pass is faster on the GPU whereas the loss is often (depending on your
# hyperparameters) faster on the CPU.
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
# FIXME: currently, the gradient is None if loss_device is cuda
loss_device = torch.device("cpu")
# Create the model and the optimizer
model = SpeakerEncoder(device, loss_device)
optimizer = torch.optim.Adam(model.parameters(), lr=learning_rate_init)
init_step = 1
# Configure file path for the model
state_fpath = models_dir.joinpath(run_id + ".pt")
backup_dir = models_dir.joinpath(run_id + "_backups")
# Load any existing model
if not force_restart:
if state_fpath.exists():
print(
"Found existing model \"%s\", loading it and resuming training."
% run_id)
checkpoint = torch.load(state_fpath)
init_step = checkpoint["step"]
model.load_state_dict(checkpoint["model_state"])
optimizer.load_state_dict(checkpoint["optimizer_state"])
optimizer.param_groups[0]["lr"] = learning_rate_init
else:
print("No model \"%s\" found, starting training from scratch." %
run_id)
else:
print("Starting the training from scratch.")
model.train()
# Initialize the visualization environment
vis = Visualizations(run_id,
vis_every,
server=visdom_server,
disabled=no_visdom)
vis.log_dataset(dataset)
vis.log_params()
device_name = str(
torch.cuda.get_device_name(0) if torch.cuda.is_available() else "CPU")
vis.log_implementation({"Device": device_name})
# Training loop
profiler = Profiler(summarize_every=10, disabled=False)
for step, speaker_batch in enumerate(loader, init_step):
profiler.tick("Blocking, waiting for batch (threaded)")
# Forward pass
inputs = torch.from_numpy(speaker_batch.data).to(device)
sync(device)
profiler.tick("Data to %s" % device)
embeds = model(inputs)
sync(device)
profiler.tick("Forward pass")
embeds_loss = embeds.view(
(speakers_per_batch, utterances_per_speaker, -1)).to(loss_device)
loss, eer = model.loss(embeds_loss)
sync(loss_device)
profiler.tick("Loss")
# Backward pass
model.zero_grad()
loss.backward()
profiler.tick("Backward pass")
model.do_gradient_ops()
optimizer.step()
profiler.tick("Parameter update")
# Update visualizations
# learning_rate = optimizer.param_groups[0]["lr"]
vis.update(loss.item(), eer, step)
# Draw projections and save them to the backup folder
if umap_every != 0 and step % umap_every == 0:
print("Drawing and saving projections (step %d)" % step)
backup_dir.mkdir(exist_ok=True)
projection_fpath = backup_dir.joinpath("%s_umap_%06d.png" %
(run_id, step))
embeds = embeds.detach().cpu().numpy()
vis.draw_projections(embeds, utterances_per_speaker, step,
projection_fpath)
vis.save()
# Overwrite the latest version of the model
if save_every != 0 and step % save_every == 0:
print("Saving the model (step %d)" % step)
torch.save(
{
"step": step + 1,
"model_state": model.state_dict(),
"optimizer_state": optimizer.state_dict(),
}, state_fpath)
# Make a backup
if backup_every != 0 and step % backup_every == 0:
print("Making a backup (step %d)" % step)
backup_dir.mkdir(exist_ok=True)
backup_fpath = backup_dir.joinpath("%s_bak_%06d.pt" %
(run_id, step))
torch.save(
{
"step": step + 1,
"model_state": model.state_dict(),
"optimizer_state": optimizer.state_dict(),
}, backup_fpath)
profiler.tick("Extras (visualizations, saving)")
def train(run_id: str, clean_data_root: Path, models_dir: Path,
umap_every: int, save_every: int, backup_every: int, vis_every: int,
force_restart: bool, visdom_server: str, no_visdom: bool):
dataset = SpeakerVerificationDataset(clean_data_root)
loader = SpeakerVerificationDataLoader(
dataset,
speakers_per_batch,
utterances_per_speaker,
num_workers=8,
)
# cuda
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
loss_device = torch.device("cpu")
# 创建模型和优化器
model = SpeakerEncoder(device, loss_device)
optimizer = torch.optim.Adam(model.parameters(), lr=learning_rate_init)
init_step = 1
# 为模型配置文件路径
state_fpath = models_dir.joinpath(run_id + ".pt")
backup_dir = models_dir.joinpath(run_id + "_backups")
model.train()
# 初始化可视化环境（visdom）
vis = Visualizations(run_id,
vis_every,
server=visdom_server,
disabled=no_visdom)
device_name = str(
torch.cuda.get_device_name(0) if torch.cuda.is_available() else "CPU")
# 开始训练
profiler = Profiler(summarize_every=10, disabled=False)
for step, speaker_batch in enumerate(loader, init_step):
profiler.tick("Blocking, waiting for batch (threaded)")
# 正向传播
inputs = torch.from_numpy(speaker_batch.data).to(device)
sync(device)
profiler.tick("Data to %s" % device)
embeds = model(inputs)
sync(device)
profiler.tick("Forward pass")
embeds_loss = embeds.view(
(speakers_per_batch, utterances_per_speaker, -1)).to(loss_device)
loss, eer = model.loss(embeds_loss)
sync(loss_device)
profiler.tick("Loss")
# 反向传播
model.zero_grad()
loss.backward()
profiler.tick("Backward pass")
model.do_gradient_ops()
optimizer.step()
profiler.tick("Parameter update")
vis.update(loss.item(), eer, step)
# 进行一次UMAP投影可视化并保存图片
if umap_every != 0 and step % umap_every == 0:
# print("Drawing and saving projections (step %d)" % step)
backup_dir.mkdir(exist_ok=True)
projection_fpath = backup_dir.joinpath("%s_umap_%06d.png" %
(run_id, step))
embeds = embeds.detach().cpu().numpy()
vis.draw_projections(embeds, utterances_per_speaker, step,
projection_fpath)
vis.save()
# 更新模型
if save_every != 0 and step % save_every == 0:
# print("Saving the model (step %d)" % step)
torch.save(
{
"step": step + 1,
"model_state": model.state_dict(),
"optimizer_state": optimizer.state_dict(),
}, state_fpath)
# 进行一次备份
if backup_every != 0 and step % backup_every == 0:
# print("Making a backup (step %d)" % step)
backup_dir.mkdir(exist_ok=True)
backup_fpath = backup_dir.joinpath("%s_bak_%06d.pt" %
(run_id, step))
torch.save(
{
"step": step + 1,
"model_state": model.state_dict(),
"optimizer_state": optimizer.state_dict(),
}, backup_fpath)
profiler.tick("Extras (visualizations, saving)")