During the first quarter this year, Hunan operated 266 freight train trips via the China-Laos, China-Vietnam, and rail-sea intermodal transport services, increasing by 46.2% year on year, according to the data released by the Changsha Customs Authority. Among these, the number of China-Laos freight train trips rose 18.7% to 89 in total, ranking first among the central regions of China.

By CHENG Lu

This year’s Singles Day sales, the 15th edition of the all-but-compulsory national shopping fest, has been and gone.

Source: New Tech Knowledge, Author: Fu Shen

The long-absent cash-burning battle in China's internet industry has finally reappeared in the fierce competition of AI large model applications.

Hi everyone. I’m Stephanie LI.

Coming up on today’s program

• China's 2024 box office reached 40 billion yuan, showcasing market resilience;
• China is set to see 100,000 eVTOLs for taxi and personal use by 2030.

Credit: CFP

TMTPOST -- On the cusp of a highly anticipated IPO on the Hong Kong Stock Exchange, Hithium Energy Storage faces mounting legal and financial challenges that threaten to overshadow its ambitious market debut.

Hi everyone. I’m Stephanie LI.

Coming up on today’s program

• China unveils new tax breaks to boost property sales;
• Tencent logs 47% jump in Q3 profit on strong gaming growth.

这里我们介绍一下阿里淘宝搜索发表在KDD'23上的最新工作：

目前，在语句编码器（sentence encoders）领域的学术研究相当多，刚开始涉足的话，可能有点令人生畏。如果你没有正确掌握语句编码器背后的理念和其中的细微差别，就很容易感到困惑。

例如，你可能知道存在sentence transformer（bi-encoders），它们的目的是为句子级别的任务产生高质量的嵌入（qualitative embeddings）。但话说回来，普通的 transformer编码器也能产生较高质量的嵌入，并且完全适合句子级任务。transformer和与之对应的sentence transformer背后的架构似乎也是相同的。然后，还有交叉编码器（cross-encoders）——它也被用于执行句子级的文本分类/回归任务。

一、项目背景与需求

场景描述

排序算法在搜索引擎中非常重要，需要根据用户的查询 q，对一些相关的文档进行排序，尽可能地让用户感兴趣的文档排在前面。之前的文章介绍了一种 Learning to rank 的算法 RankNet，现在介绍另外两种比较经典的排序模型 LambdaRank 和 lambdaMART。

1.RankNet 的问题