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feat: add sigmoid learning rate scheduler

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Add new 'sigmoid' learning rate adjustment method to utils/tools.py
with logistic growth rate and warm-up smoothing for better training
convergence.
This commit is contained in:
gameloader
2025-09-03 07:13:25 +00:00
parent a069c9a874
commit 12cb7652cf
1 changed files with 5 additions and 0 deletions
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5
utils/tools.py
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@ -22,6 +22,11 @@ def adjust_learning_rate(optimizer, epoch, args):
lr_adjust = {epoch: args.learning_rate if epoch < 3 else args.learning_rate * (0.9 ** ((epoch - 3) // 1))}
elif args.lradj == "cosine":
lr_adjust = {epoch: args.learning_rate /2 * (1 + math.cos(epoch / args.train_epochs * math.pi))}
elif args.lradj == 'sigmoid':
k = 0.5 # logistic growth rate
s = 10 # decreasing curve smoothing rate
w = 10 # warm-up coefficient
lr_adjust = {epoch: args.learning_rate / (1 + np.exp(-k * (epoch - w))) - args.learning_rate / (1 + np.exp(-k/s * (epoch - w*s)))}
if epoch in lr_adjust.keys():
lr = lr_adjust[epoch]
for param_group in optimizer.param_groups: