From 1cbcbb4b6f928735279ee0a7af931749e6af02f2 Mon Sep 17 00:00:00 2001
From: ShikiSuen <shikisuen@outlook.com>
Date: Sun, 24 Jul 2022 00:09:24 +0800
Subject: [PATCH] UOM // Boost decay period from 1.5hrs to 6hrs.

---
 Source/Modules/LangModelRelated/SubLMs/lmUserOverride.swift | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Source/Modules/LangModelRelated/SubLMs/lmUserOverride.swift b/Source/Modules/LangModelRelated/SubLMs/lmUserOverride.swift
index 2a5d9ee6..7b8551de 100644
--- a/Source/Modules/LangModelRelated/SubLMs/lmUserOverride.swift
+++ b/Source/Modules/LangModelRelated/SubLMs/lmUserOverride.swift
@@ -33,9 +33,11 @@ extension vChewing {
     var mutDecayExponent: Double
     var mutLRUList: [KeyObservationPair] = []
     var mutLRUMap: [String: KeyObservationPair] = [:]
-    let kDecayThreshold: Double = 1.0 / 1_048_576.0
+    let kDecayThreshold: Double = 1.0 / 1_048_576.0  // 衰減二十次之後差不多就失效了。
 
-    public init(capacity: Int = 500, decayConstant: Double = 5400.0) {
+    public static let kObservedOverrideHalfLife: Double = 3600.0 * 6  // 6 小時半衰一次，能持續不到六天的記憶。
+
+    public init(capacity: Int = 500, decayConstant: Double = LMUserOverride.kObservedOverrideHalfLife) {
       mutCapacity = max(capacity, 1)  // Ensures that this integer value is always > 0.
       mutDecayExponent = log(0.5) / decayConstant
     }