[Feature] Resume from the latest checkpoint automatically.

mmrazor/apis/mmcls/train.py

@@ -16,6 +16,7 @@
 from mmrazor.core.hooks import DistSamplerSeedHook
 from mmrazor.core.optimizer import build_optimizers
 from mmrazor.datasets.utils import split_dataset
+from mmrazor.utils import find_latest_checkpoint
 
 
 def set_random_seed(seed, deterministic=False):
@@ -190,6 +191,12 @@ def train_model(model,
         runner.register_hook(
             eval_hook(val_dataloader, **eval_cfg), priority='LOW')
 
+    resume_from = None
+    if cfg.resume_from is None and cfg.get('auto_resume'):
+        resume_from = find_latest_checkpoint(cfg.work_dir)
+    if resume_from is not None:
+        cfg.resume_from = resume_from
+
     if cfg.resume_from:
         runner.resume(cfg.resume_from)
     elif cfg.load_from:

mmrazor/apis/mmdet/train.py

@@ -15,6 +15,7 @@
 from mmrazor.core.distributed_wrapper import DistributedDataParallelWrapper
 from mmrazor.core.hooks import DistSamplerSeedHook
 from mmrazor.core.optimizer import build_optimizers
+from mmrazor.utils import find_latest_checkpoint
 
 
 def set_random_seed(seed, deterministic=False):
@@ -181,6 +182,12 @@ def train_detector(model,
         runner.register_hook(
             eval_hook(val_dataloader, **eval_cfg), priority='LOW')
 
+    resume_from = None
+    if cfg.resume_from is None and cfg.get('auto_resume'):
+        resume_from = find_latest_checkpoint(cfg.work_dir)
+    if resume_from is not None:
+        cfg.resume_from = resume_from
+
     if cfg.resume_from:
         runner.resume(cfg.resume_from)
     elif cfg.load_from:

mmrazor/apis/mmseg/train.py

@@ -12,6 +12,7 @@
 
 from mmrazor.core.distributed_wrapper import DistributedDataParallelWrapper
 from mmrazor.core.optimizer import build_optimizers
+from mmrazor.utils import find_latest_checkpoint
 
 
 def set_random_seed(seed, deterministic=False):
@@ -137,6 +138,12 @@ def train_segmentor(model,
         runner.register_hook(
             eval_hook(val_dataloader, **eval_cfg), priority='LOW')
 
+    resume_from = None
+    if cfg.resume_from is None and cfg.get('auto_resume'):
+        resume_from = find_latest_checkpoint(cfg.work_dir)
+    if resume_from is not None:
+        cfg.resume_from = resume_from
+
     if cfg.resume_from:
         runner.resume(cfg.resume_from)
     elif cfg.load_from:

mmrazor/utils/__init__.py

@@ -1,4 +1,5 @@
 # Copyright (c) OpenMMLab. All rights reserved.
+from .misc import find_latest_checkpoint
 from .setup_env import setup_multi_processes
 
-__all__ = ['setup_multi_processes']
+__all__ = ['find_latest_checkpoint', 'setup_multi_processes']

mmrazor/utils/misc.py

@@ -0,0 +1,38 @@
+# Copyright (c) OpenMMLab. All rights reserved.
+import glob
+import os.path as osp
+import warnings
+
+
+def find_latest_checkpoint(path, suffix='pth'):
+    """Find the latest checkpoint from the working directory.
+
+    Args:
+        path(str): The path to find checkpoints.
+        suffix(str): File extension. Defaults to pth.
+
+    Returns:
+        latest_path(str | None): File path of the latest checkpoint.
+
+    References:
+        .. [1] https://github.com/microsoft/SoftTeacher
+                  /blob/main/ssod/utils/patch.py
+    """
+    if not osp.exists(path):
+        warnings.warn('The path of checkpoints does not exist.')
+        return None
+    if osp.exists(osp.join(path, f'latest.{suffix}')):
+        return osp.join(path, f'latest.{suffix}')
+
+    checkpoints = glob.glob(osp.join(path, f'*.{suffix}'))
+    if len(checkpoints) == 0:
+        warnings.warn('There are no checkpoints in the path.')
+        return None
+    latest = -1
+    latest_path = None
+    for checkpoint in checkpoints:
+        count = int(osp.basename(checkpoint).split('_')[-1].split('.')[0])
+        if count > latest:
+            latest = count
+            latest_path = checkpoint
+    return latest_path

tests/test_utils/test_misc.py

@@ -0,0 +1,43 @@
+# Copyright (c) OpenMMLab. All rights reserved.
+import os.path as osp
+import tempfile
+
+from mmrazor.utils import find_latest_checkpoint
+
+
+def test_find_latest_checkpoint():
+    with tempfile.TemporaryDirectory() as tmpdir:
+        path = tmpdir
+        latest = find_latest_checkpoint(path)
+        # There are no checkpoints in the path.
+        assert latest is None
+
+        path = tmpdir + '/none'
+        latest = find_latest_checkpoint(path)
+        # The path does not exist.
+        assert latest is None
+
+    with tempfile.TemporaryDirectory() as tmpdir:
+        with open(tmpdir + '/latest.pth', 'w') as f:
+            f.write('latest')
+        path = tmpdir
+        latest = find_latest_checkpoint(path)
+        assert latest == osp.join(tmpdir, 'latest.pth')
+
+    with tempfile.TemporaryDirectory() as tmpdir:
+        with open(tmpdir + '/iter_4000.pth', 'w') as f:
+            f.write('iter_4000')
+        with open(tmpdir + '/iter_8000.pth', 'w') as f:
+            f.write('iter_8000')
+        path = tmpdir
+        latest = find_latest_checkpoint(path)
+        assert latest == osp.join(tmpdir, 'iter_8000.pth')
+
+    with tempfile.TemporaryDirectory() as tmpdir:
+        with open(tmpdir + '/epoch_1.pth', 'w') as f:
+            f.write('epoch_1')
+        with open(tmpdir + '/epoch_2.pth', 'w') as f:
+            f.write('epoch_2')
+        path = tmpdir
+        latest = find_latest_checkpoint(path)
+        assert latest == osp.join(tmpdir, 'epoch_2.pth')

tools/mmcls/train_mmcls.py

@@ -26,6 +26,10 @@ def parse_args():
     parser.add_argument('--work-dir', help='the dir to save logs and models')
     parser.add_argument(
         '--resume-from', help='the checkpoint file to resume from')
+    parser.add_argument(
+        '--auto-resume',
+        action='store_true',
+        help='resume from the latest checkpoint automatically')
     parser.add_argument(
         '--no-validate',
         action='store_true',
@@ -101,6 +105,7 @@ def main():
                                 osp.splitext(osp.basename(args.config))[0])
     if args.resume_from is not None:
         cfg.resume_from = args.resume_from
+    cfg.auto_resume = args.auto_resume
     if args.gpus is not None:
         cfg.gpu_ids = range(1)
         warnings.warn('`--gpus` is deprecated because we only support '

tools/mmdet/train_mmdet.py

@@ -34,6 +34,10 @@ def parse_args():
     parser.add_argument('--work-dir', help='the dir to save logs and models')
     parser.add_argument(
         '--resume-from', help='the checkpoint file to resume from')
+    parser.add_argument(
+        '--auto-resume',
+        action='store_true',
+        help='resume from the latest checkpoint automatically')
     parser.add_argument(
         '--no-validate',
         action='store_true',
@@ -112,6 +116,7 @@ def main():
                                 osp.splitext(osp.basename(args.config))[0])
     if args.resume_from is not None:
         cfg.resume_from = args.resume_from
+    cfg.auto_resume = args.auto_resume
     if args.gpus is not None:
         cfg.gpu_ids = range(1)
         warnings.warn('`--gpus` is deprecated because we only support '

tools/mmseg/train_mmseg.py

@@ -37,6 +37,10 @@ def parse_args():
         '--load-from', help='the checkpoint file to load weights from')
     parser.add_argument(
         '--resume-from', help='the checkpoint file to resume from')
+    parser.add_argument(
+        '--auto-resume',
+        action='store_true',
+        help='resume from the latest checkpoint automatically')
     parser.add_argument(
         '--no-validate',
         action='store_true',
@@ -114,6 +118,7 @@ def main():
         cfg.load_from = args.load_from
     if args.resume_from is not None:
         cfg.resume_from = args.resume_from
+    cfg.auto_resume = args.auto_resume
     if args.gpus is not None:
         cfg.gpu_ids = range(1)
         warnings.warn('`--gpus` is deprecated because we only support '