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update default parameters as suggested in #1606 #1611

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Nov 25, 2019
Merged

update default parameters as suggested in #1606 #1611

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14 changes: 11 additions & 3 deletions references/detection/train.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,14 @@
The default hyperparameters are tuned for training on 8 gpus and 2 images per gpu.
--lr 0.02 --batch-size 2 --world-size 8
If you use different number of gpus, the learning rate should be changed to 0.02/8*$NGPU.

On top of that, for training Faster/Mask R-CNN, the default hyperparameters are
--epochs 26 --lr-steps 16 22 --aspect-ratio-group-factor 3

Also, if you train Keypoint R-CNN, the default hyperparameters are
--epochs 46 --lr-steps 36 43 --aspect-ratio-group-factor 3
Because the number of images is smaller in the person keypoint subset of COCO,
the number of epochs should be adapted so that we have the same number of iterations.
"""
import datetime
import os
Expand Down Expand Up @@ -145,7 +153,7 @@ def main(args):
parser.add_argument('--device', default='cuda', help='device')
parser.add_argument('-b', '--batch-size', default=2, type=int,
help='images per gpu, the total batch size is $NGPU x batch_size')
parser.add_argument('--epochs', default=13, type=int, metavar='N',
parser.add_argument('--epochs', default=26, type=int, metavar='N',
help='number of total epochs to run')
parser.add_argument('-j', '--workers', default=4, type=int, metavar='N',
help='number of data loading workers (default: 4)')
Expand All @@ -158,12 +166,12 @@ def main(args):
metavar='W', help='weight decay (default: 1e-4)',
dest='weight_decay')
parser.add_argument('--lr-step-size', default=8, type=int, help='decrease lr every step-size epochs')
parser.add_argument('--lr-steps', default=[8, 11], nargs='+', type=int, help='decrease lr every step-size epochs')
parser.add_argument('--lr-steps', default=[16, 22], nargs='+', type=int, help='decrease lr every step-size epochs')
parser.add_argument('--lr-gamma', default=0.1, type=float, help='decrease lr by a factor of lr-gamma')
parser.add_argument('--print-freq', default=20, type=int, help='print frequency')
parser.add_argument('--output-dir', default='.', help='path where to save')
parser.add_argument('--resume', default='', help='resume from checkpoint')
parser.add_argument('--aspect-ratio-group-factor', default=0, type=int)
parser.add_argument('--aspect-ratio-group-factor', default=3, type=int)
parser.add_argument(
"--test-only",
dest="test_only",
Expand Down