From 3d698f96a4d6b464abf56b7112c1373db6185bcc Mon Sep 17 00:00:00 2001
From: Ayush Ojha <ayushozha@outlook.com>
Date: Fri, 30 Jan 2026 06:38:29 -0800
Subject: [PATCH] refactor: separate constants from config.py into constant.py

Moves PROTOCOL_VERSION, NUM_USABLE_CPU, DISK_DATASET_CACHE,
SIMPLE_DATASET_CACHE, DISK_EXPRESSION_CACHE, and DEPENDENCY_REDIS_CACHE
from qlib/config.py to qlib/constant.py where other project constants
already reside. The constants are re-imported in config.py to maintain
backward compatibility.

Closes #807
---
 qlib/config.py   | 24 +++++++++++-------------
 qlib/constant.py | 12 ++++++++++++
 2 files changed, 23 insertions(+), 13 deletions(-)

diff --git a/qlib/config.py b/qlib/config.py
index 4e5d62564f7..837efe2fb9e 100644
--- a/qlib/config.py
+++ b/qlib/config.py
@@ -17,12 +17,21 @@
 import copy
 import logging
 import platform
-import multiprocessing
 from pathlib import Path
 from typing import Callable, Optional, Union
 from typing import TYPE_CHECKING
 
-from qlib.constant import REG_CN, REG_US, REG_TW
+from qlib.constant import (
+    REG_CN,
+    REG_US,
+    REG_TW,
+    PROTOCOL_VERSION,
+    NUM_USABLE_CPU,
+    DISK_DATASET_CACHE,
+    SIMPLE_DATASET_CACHE,
+    DISK_EXPRESSION_CACHE,
+    DEPENDENCY_REDIS_CACHE,
+)
 
 if TYPE_CHECKING:
     from qlib.utils.time import Freq
@@ -120,17 +129,6 @@ def register_from_C(config, skip_register=True):
         C.register()
 
 
-# pickle.dump protocol version: https://docs.python.org/3/library/pickle.html#data-stream-format
-PROTOCOL_VERSION = 4
-
-NUM_USABLE_CPU = max(multiprocessing.cpu_count() - 2, 1)
-
-DISK_DATASET_CACHE = "DiskDatasetCache"
-SIMPLE_DATASET_CACHE = "SimpleDatasetCache"
-DISK_EXPRESSION_CACHE = "DiskExpressionCache"
-
-DEPENDENCY_REDIS_CACHE = (DISK_DATASET_CACHE, DISK_EXPRESSION_CACHE)
-
 _default_config = {
     # data provider config
     "calendar_provider": "LocalCalendarProvider",
diff --git a/qlib/constant.py b/qlib/constant.py
index ac6c76ae22c..d11ea0ec6c5 100644
--- a/qlib/constant.py
+++ b/qlib/constant.py
@@ -2,6 +2,7 @@
 # Licensed under the MIT License.
 
 # REGION CONST
+import multiprocessing
 from typing import TypeVar
 
 import numpy as np
@@ -20,3 +21,14 @@
 ONE_MIN = pd.Timedelta("1min")
 EPS_T = pd.Timedelta("1s")  # use 1 second to exclude the right interval point
 float_or_ndarray = TypeVar("float_or_ndarray", float, np.ndarray)
+
+# pickle.dump protocol version: https://docs.python.org/3/library/pickle.html#data-stream-format
+PROTOCOL_VERSION = 4
+
+NUM_USABLE_CPU = max(multiprocessing.cpu_count() - 2, 1)
+
+DISK_DATASET_CACHE = "DiskDatasetCache"
+SIMPLE_DATASET_CACHE = "SimpleDatasetCache"
+DISK_EXPRESSION_CACHE = "DiskExpressionCache"
+
+DEPENDENCY_REDIS_CACHE = (DISK_DATASET_CACHE, DISK_EXPRESSION_CACHE)