diff --git a/mmengine/dataset/base_dataset.py b/mmengine/dataset/base_dataset.py
index fbcfe82c411e60a34f3c3c87b49de4a528f73118..9e85f9023061817eb6787cf3d37f308a56abef0c 100644
--- a/mmengine/dataset/base_dataset.py
+++ b/mmengine/dataset/base_dataset.py
@@ -12,7 +12,7 @@ from torch.utils.data import Dataset
from mmengine.fileio import list_from_file, load
from mmengine.registry import TRANSFORMS
-from mmengine.utils import check_file_exist
+from mmengine.utils import is_abs
class Compose:
@@ -428,7 +428,6 @@ class BaseDataset(Dataset):
""" # noqa: E501
# `self.ann_file` denotes the absolute annotation file path if
# `self.root=None` or relative path if `self.root=/path/to/data/`.
- check_file_exist(self.ann_file)
annotations = load(self.ann_file)
if not isinstance(annotations, dict):
raise TypeError(f'The annotations loaded from annotation file '
@@ -482,7 +481,7 @@ class BaseDataset(Dataset):
Returns:
dict: Parsed meta information.
"""
- # `cls.METAINFO` will be overwritten by in_meta
+ # avoid `cls.METAINFO` being overwritten by `metainfo`
cls_metainfo = copy.deepcopy(cls.METAINFO)
if metainfo is None:
return cls_metainfo
@@ -491,13 +490,17 @@ class BaseDataset(Dataset):
f'metainfo should be a dict, but got {type(metainfo)}')
for k, v in metainfo.items():
- if isinstance(v, str) and osp.isfile(v):
- # if filename in metainfo, this key will be further parsed.
- # nested filename will be ignored.
- cls_metainfo[k] = list_from_file(v)
+ if isinstance(v, str):
+ # If type of value is string, and can be loaded from
+ # corresponding backend. it means the file name of meta file.
+ try:
+ cls_metainfo[k] = list_from_file(v)
+ except (TypeError, FileNotFoundError):
+ warnings.warn(f'{v} is not a meta file, simply parsed as '
+ 'meta information')
+ cls_metainfo[k] = v
else:
cls_metainfo[k] = v
-
return cls_metainfo
def _join_prefix(self):
@@ -526,7 +529,7 @@ class BaseDataset(Dataset):
"""
# Automatically join annotation file path with `self.root` if
# `self.ann_file` is not an absolute path.
- if not osp.isabs(self.ann_file) and self.ann_file:
+ if not is_abs(self.ann_file) and self.ann_file:
self.ann_file = osp.join(self.data_root, self.ann_file)
# Automatically join data directory with `self.root` if path value in
# `self.data_prefix` is not an absolute path.
@@ -534,9 +537,11 @@ class BaseDataset(Dataset):
if prefix is None:
self.data_prefix[data_key] = self.data_root
elif isinstance(prefix, str):
- if not osp.isabs(prefix):
+ if not is_abs(prefix):
self.data_prefix[data_key] = osp.join(
self.data_root, prefix)
+ else:
+ self.data_prefix[data_key] = prefix
else:
raise TypeError('prefix should be a string or None, but got '
f'{type(prefix)}')
@@ -725,10 +730,9 @@ class BaseDataset(Dataset):
sub_data_list = self.data_list[indices:]
elif isinstance(indices, Sequence):
# Return the data information according to given indices.
- subdata_list = []
+ sub_data_list = []
for idx in indices:
- subdata_list.append(self.data_list[idx])
- sub_data_list = subdata_list
+ sub_data_list.append(self.data_list[idx])
else:
raise TypeError('indices should be a int or sequence of int, '
f'but got {type(indices)}')
diff --git a/mmengine/utils/__init__.py b/mmengine/utils/__init__.py
index 690b3b397d183fb6c8b59de3fd9d32962d1ee148..56483df3f04662fed98efd1a478eeeaebe0ac8d7 100644
--- a/mmengine/utils/__init__.py
+++ b/mmengine/utils/__init__.py
@@ -10,8 +10,8 @@ from .misc import (check_prerequisites, concat_list, deprecated_api_warning,
to_1tuple, to_2tuple, to_3tuple, to_4tuple, to_ntuple,
tuple_cast)
from .parrots_wrapper import TORCH_VERSION
-from .path import (check_file_exist, fopen, is_filepath, mkdir_or_exist,
- scandir, symlink)
+from .path import (check_file_exist, fopen, is_abs, is_filepath,
+ mkdir_or_exist, scandir, symlink)
from .setup_env import set_multi_processing
from .version_utils import digit_version, get_git_hash
@@ -28,5 +28,5 @@ __all__ = [
'is_method_overridden', 'has_method', 'mmcv_full_available',
'digit_version', 'get_git_hash', 'TORCH_VERSION', 'load_url',
'find_latest_checkpoint', 'ManagerMeta', 'ManagerMixin',
- 'set_multi_processing', 'has_batch_norm'
+ 'set_multi_processing', 'has_batch_norm', 'is_abs'
]
diff --git a/mmengine/utils/path.py b/mmengine/utils/path.py
index 56808183777d8070a94f8c346b7929da1f56ceb4..c1228f13b1f681821b4b4e364b472b796953e45c 100644
--- a/mmengine/utils/path.py
+++ b/mmengine/utils/path.py
@@ -99,3 +99,18 @@ def find_vcs_root(path, markers=('.git', )):
return cur
prev, cur = cur, osp.split(cur)[0]
return None
+
+
+def is_abs(path: str) -> bool:
+ """Check if path is an absolute path in different backends.
+
+ Args:
+ path (str): path of directory or file.
+
+ Returns:
+ bool: whether path is an absolute path.
+ """
+ if osp.isabs(path) or path.startswith(('http', 'https', 's3')):
+ return True
+ else:
+ return False
diff --git a/tests/test_data/test_base_dataset.py b/tests/test_data/test_base_dataset.py
index a3cf586cb6dcf48cc28cd576d2706ad154c435bd..7c575e2af80b7ce8ca2ca41212a9ffe1f07c6aea 100644
--- a/tests/test_data/test_base_dataset.py
+++ b/tests/test_data/test_base_dataset.py
@@ -85,6 +85,7 @@ class TestBaseDataset:
lazy_init=True)
assert not dataset._fully_initialized
assert not dataset.data_list
+
# test the instantiation of self.base_dataset if ann_file is not
# existed.
with pytest.raises(FileNotFoundError):
@@ -93,7 +94,7 @@ class TestBaseDataset:
data_prefix=dict(img='imgs'),
ann_file='annotations/not_existed_annotation.json')
# Use the default value of ann_file, i.e., ''
- with pytest.raises(FileNotFoundError):
+ with pytest.raises(TypeError):
BaseDataset(
data_root=osp.join(osp.dirname(__file__), '../data/'),
data_prefix=dict(img='imgs'))