[Cherry pick] fix warning (#2536)

* fix warning

ppdet/modeling/__init__.py

+# OP docs may contains math formula which may cause
+# DeprecationWarning in string parsing
+import warnings
+warnings.filterwarnings(
+    action='ignore', category=DeprecationWarning, module='ops')
+
 from . import ops
 from . import backbones
 from . import necks

requirements.txt

@@ -7,3 +7,4 @@ shapely
 scipy
 terminaltables
 pycocotools
+setuptools>=42.0.0

tools/eval.py

@@ -22,10 +22,6 @@ parent_path = os.path.abspath(os.path.join(__file__, *(['..'] * 2)))
 if parent_path not in sys.path:
     sys.path.append(parent_path)
 
-# ignore warning log
-import warnings
-warnings.filterwarnings('ignore')
-
 import paddle
 
 from ppdet.core.workspace import load_config, merge_config

tools/export_model.py

@@ -21,10 +21,6 @@ parent_path = os.path.abspath(os.path.join(__file__, *(['..'] * 2)))
 if parent_path not in sys.path:
     sys.path.append(parent_path)
 
-# ignore warning log
-import warnings
-warnings.filterwarnings('ignore')
-
 import paddle
 
 from ppdet.core.workspace import load_config, merge_config

tools/infer.py

@@ -21,9 +21,6 @@ parent_path = os.path.abspath(os.path.join(__file__, *(['..'] * 2)))
 if parent_path not in sys.path:
     sys.path.append(parent_path)
 
-# ignore warning log
-import warnings
-warnings.filterwarnings('ignore')
 import glob
 
 import paddle

tools/train.py

@@ -22,9 +22,6 @@ parent_path = os.path.abspath(os.path.join(__file__, *(['..'] * 2)))
 if parent_path not in sys.path:
     sys.path.append(parent_path)
 
-# ignore warning log
-import warnings
-warnings.filterwarnings('ignore')
 import random
 import numpy as np