Add Priority (#92)

mmengine/runner/__init__.py

@@ -0,0 +1 @@
+# Copyright (c) OpenMMLab. All rights reserved.

mmengine/runner/priority.py

@@ -0,0 +1,60 @@
+# Copyright (c) OpenMMLab. All rights reserved.
+from enum import Enum
+from typing import Union
+
+
+class Priority(Enum):
+    """Hook priority levels.
+
+    +--------------+------------+
+    | Level        | Value      |
+    +==============+============+
+    | HIGHEST      | 0          |
+    +--------------+------------+
+    | VERY_HIGH    | 10         |
+    +--------------+------------+
+    | HIGH         | 30         |
+    +--------------+------------+
+    | ABOVE_NORMAL | 40         |
+    +--------------+------------+
+    | NORMAL       | 50         |
+    +--------------+------------+
+    | BELOW_NORMAL | 60         |
+    +--------------+------------+
+    | LOW          | 70         |
+    +--------------+------------+
+    | VERY_LOW     | 90         |
+    +--------------+------------+
+    | LOWEST       | 100        |
+    +--------------+------------+
+    """
+
+    HIGHEST = 0
+    VERY_HIGH = 10
+    HIGH = 30
+    ABOVE_NORMAL = 40
+    NORMAL = 50
+    BELOW_NORMAL = 60
+    LOW = 70
+    VERY_LOW = 90
+    LOWEST = 100
+
+
+def get_priority(priority: Union[int, str, Priority]) -> int:
+    """Get priority value.
+
+    Args:
+        priority (int or str or :obj:`Priority`): Priority.
+    Returns:
+        int: The priority value.
+    """
+    if isinstance(priority, int):
+        if priority < 0 or priority > 100:
+            raise ValueError('priority must be between 0 and 100')
+        return priority
+    elif isinstance(priority, Priority):
+        return priority.value
+    elif isinstance(priority, str):
+        return Priority[priority.upper()].value
+    else:
+        raise TypeError('priority must be an integer or Priority enum value')