[Bug Fix] Fix pycocotools warning (#4958)

Author: xvjiarui

mmdet/datasets/api_wrappers/coco_api.py

@@ -15,7 +15,7 @@ class COCO(_COCO):
     """
 
     def __init__(self, annotation_file=None):
-        if not getattr(pycocotools, '__version__', '0') >= '12.0.2':
+        if getattr(pycocotools, '__version__', '0') >= '12.0.2':
             warnings.warn(
                 'mmpycocotools is deprecated. Please install official pycocotools by "pip install pycocotools"',  # noqa: E501
                 UserWarning)

mmdet/datasets/lvis.py

@@ -278,7 +278,7 @@ def load_annotations(self, ann_file):
 
         try:
             import lvis
-            if lvis.__version__ >= '10.5.3':
+            if getattr(lvis, '__version__', '0') >= '10.5.3':
                 warnings.warn(
                     'mmlvis is deprecated, please install official lvis-api by "pip install git+https://github.com/lvis-dataset/lvis-api.git"',  # noqa: E501
                     UserWarning)
@@ -336,7 +336,7 @@ def evaluate(self,
 
         try:
             import lvis
-            if lvis.__version__ >= '10.5.3':
+            if getattr(lvis, '__version__', '0') >= '10.5.3':
                 warnings.warn(
                     'mmlvis is deprecated, please install official lvis-api by "pip install git+https://github.com/lvis-dataset/lvis-api.git"',  # noqa: E501
                     UserWarning)
@@ -711,6 +711,11 @@ class LVISV1Dataset(LVISDataset):
 
     def load_annotations(self, ann_file):
         try:
+            import lvis
+            if getattr(lvis, '__version__', '0') >= '10.5.3':
+                warnings.warn(
+                    'mmlvis is deprecated, please install official lvis-api by "pip install git+https://github.com/lvis-dataset/lvis-api.git"',  # noqa: E501
+                    UserWarning)
             from lvis import LVIS
         except ImportError:
             raise ImportError(