docs: update global openrank sigmod

Signed-off-by: frank-zsy <[email protected]>

docs/user_docs/metrics/global_openrank.md

@@ -40,7 +40,7 @@
 | :------------- | :---- | :---------- | :--- |
 | 仓库 OpenRank 默认值 | $0$ | 协作网络中新增仓库节点的默认值 | 该算法认为协作网络中的价值均应来自开发者的活跃，因此仓库节点默认不提供价值 |
 | 开发者 OpenRank 默认值 | $0$ | 协作网络中新增开发者节点的默认值 | 该算法认为协作网络中的价值来自开发者活跃，因此开发者默认不提供价值 |
-| 开发者 OpenRank 增值 | $min(1,a/88.17)$ | 每次计算时开发者节点的 OpenRank 增值 | 网络中所有价值均来自开发者当月活跃带来的 OpenRank 增值。其中 88.17 为全域开发者每月活跃度分布的 75% 分位数，大于该值则均为 1，小于该值则线性衰减 |
+| 开发者 OpenRank 增值 | $\frac{1}{1+e^{0.1*(-x+44.08)}}$ | 每次计算时开发者节点的 OpenRank 增值 | 网络中所有价值均来自开发者当月活跃带来的 OpenRank 增值。其中 44.08 为全域开发者每月活跃度分布上四分位数的一半，这里使用 Sigmod 归一化减少低活跃开发者的影响 |
 | 开发者继承比例 | $0.5$ | 开发者节点对于上个月 OpenRank 的依赖比例 | 该算法认为相较于仓库，开发者的价值更应体现出开源中的长期价值，因此开发者对于历史价值的依赖度较高 |
 | 仓库继承比例 | $0.3$ | 仓库节点对于上个月 OpenRank 的依赖比例 | |
 | OpenRank 衰减系数 | $0.85$ | 对于当月不活跃的开发者和仓库节点的 OpenRank 衰减比例 | 所有节点无论是否活跃，均会在当月有一定衰减，从而需要额外的开发者活跃来维持网络价值 |

i18n/en/docusaurus-plugin-content-docs/current/user_docs/metrics/global_openrank.md

@@ -40,7 +40,7 @@ The parameters included in the calculation of Global OpenRank are as follows:
 | :------------------------- | :------------------------- | :----------------------------------------------------------------- | :------------------------------------------------------------------- |
 | Repository OpenRank Default Value | $0$                        | Default value for new repository nodes in the collaboration network | The algorithm assumes that the value in the collaboration network should come from developer activity, so repository nodes do not provide initial value by default. |
 | Developer OpenRank Default Value  | $0$                        | Default value for new developer nodes in the collaboration network  | The algorithm assumes that the value in the collaboration network comes from developer activity, so developers do not provide initial value by default.  |
-| Developer OpenRank Increment     | $min(1,a/88.17)$           | Developer node OpenRank increment in each calculation               | All value in the network comes from the OpenRank increment generated by developer activity during the month. 88.17 is the 75th percentile of global developer monthly activity distribution; values greater than this are capped at 1, while lower values decay linearly. |
+| Developer OpenRank Increment     | $\frac{1}{1+e^{0.1*(-x+44.08)}}$           | Developer node OpenRank increment in each calculation               | All value in the network comes from the OpenRank increment generated by developer activity during the month. 44.08 is the 75th percentile of global developer monthly activity distribution; Using Sigmod here to reduce the influence of low activity developers. |
 | Developer Inheritance Ratio      | $0.5$                      | Developer node dependency ratio on the previous month's OpenRank    | The algorithm assumes that, compared to repositories, the value of developers should better reflect long-term value in open source, so developers have a higher dependency on historical value. |
 | Repository Inheritance Ratio     | $0.3$                      | Repository node dependency ratio on the previous month's OpenRank   |                                                                      |
 | OpenRank Decay Coefficient       | $0.85$                     | OpenRank decay ratio for inactive developers and repository nodes   | All nodes, whether active or not, will experience some decay each month, requiring additional developer activity to maintain the network's value. |