三月 祭

人世真是孤独啊

We miss you Yu!

纪念我的挚友-林宇（写于2022.11.20）

今早微博又推送回忆，我心里猛然一惊：周一微信发的消息他到现在没有回复。先是有种不祥的预感，很快辗转得知了噩耗。刚好一个人在家，不用任何掩饰我瞬间就哭得呼天抢地，难以言表的不舍和足以让整个身体颤抖的心疼，特别疼…

友情始于中科院研究生时期，机缘巧合隔着北四环计算所的他和动物所的我成了一起备考GRE的G友。俩人先后考试，共同彷徨，在申请学校的过程中互相鼓励和帮助，又前后脚偏离计划的轨道分别去了苏格兰和瑞士。那段时间我频繁崴脚，步行时他都帮我看路还顺带收集厕所的方位信息。此后的若干年里，在世界各地我们见面的时候他都保持这一标准操作。

林宇稳步走上优秀科学家的道路，做他喜欢同时也非常擅长的研究，我挣扎过后逃离科研做了打工人，我们依然默契地聊纯粹的数学和生命科学，也聊生活和琐碎的家事。他双商极高，温文儒雅，真诚有爱，慷慨大方，从不吝惜自己的钱财和智慧。身为他的朋友，近20年来我受到的眷顾数不胜数：读博士时有一阵我用excel处理大量数据手腕子疼，他帮忙写了个小程序一键完成；我去法国尼斯出差，他扛了一行李箱的瑞士巧克力来找我，在蒙特卡罗赌场门口给我讲蒙特卡洛算法和拉斯维加斯算法；孕晚期我去丹麦出差心里没底，他从瑞士过来见面；孩子出生前他用处于史上汇率高点的瑞士法郎援助我们买了辆舒适的车，数不胜数。印象中林宇只拜托过我一件事，研究生时他有一段时间在香港城市大学访学，卜老师生日研究组聚餐，我代他去给卜老师送了一束花。我很愧疚，早先知道他在吃降压药控制血压，应该经常关心一下的；身处医药行业，身为他的朋友，疫情以来没有机会见面也疏于联络，没能给到他足够的健康方面的提醒。

脑海中放电影似的，一幕幕场景都那么清晰，点点滴滴都那么美好，庆幸我遇到这么好的朋友，也遗憾此生我没有机会成为他更好的朋友。最后一次见面是2018年4月7号，我们一起吃了我家附近的淮扬菜—无名居，然后来家里喝茶小坐，他千里迢迢带了澳洲土特产Manuka蜂蜜，我许诺下次见面一定请他吃海底捞。没想到那竟是永别，念叨好多年的海底捞也没能吃上。

我们甚至连一张合影都没有（为了避免给彼此带来不必要的困扰，每次见面只有互拍，心照不宣地不合影。我老公不信，帮我翻遍备份的照片也只找到了他俩的合影）。无限怀念，悲痛莫名。林宇，谢谢你出现在我的生命中，也希望在平行世界里，我们可以继续君子之交。

P.S. 阴雨天总是下意识想起林宇，因为我们是在一个暴雨天认识的，也因为他曾幽默地讲过一个谐音梗，下雨天不打伞—“我就是喜欢淋（林）雨（宇）”。前不久看电影《长安三万里》，里面有几句诗“生者为过客，死者为归人。天地一逆旅，同悲万古尘。”，很有共鸣，我想林宇或许原本也是仙人，归去天上，以这样的方式与我们同在。

在我的人生中有宇这样的朋友是非常幸运的，受他帮助良多。记得高考之前我复习功课时有很多的知识盲区，他自信又快乐地对我说：我已经保送科大了，你有问题尽管问，我无所不知。高考结束的那天中午，阳光明媚，你骑自行车带着我去打牌，爬山，逛街；我带着你去乡下种黄瓜，捉青蛙。过往种种已似云烟，但人的记忆是相通的，所以你的逝去也是我们的逝去，同样的你也活在我们的回忆中。从未想过与你会阴阳两隔，以后再也不会有人跨越1万公里，经过千山万水来和我吃一碗面了。穿云俊鹭上青天，林间钝羽空茫然，愿你的灵魂在你向往的桃花源，welcome.

林宇是我的师叔，我至今依然无法想象这样的事情发生在了师叔身上。
在我们的研究合作中师叔给予了细致的指导，每次研究遇到困境师叔都能高屋建瓴的理解问题并且给我细致的方向指导，他在我的博士期间就是我的良师益友。我深知，没有师叔的协助，我的研究成果无法顺利发表，我也不可能比较顺利的如期博士毕业。
2016年我去业界工作后，师叔也去了澳大利亚工作生活，虽然联系减少，但感激之情依然常在心中，好希望我们还能继续电话互问近况。师叔已在天堂，遗憾颇多，我在此献上最诚挚的感谢和思念之情。

周军 01/09/2023

我是武睿哲，我跟林宇是大学同班同学，我住137他住138，我们每天晚上都聊天。那天，我早会，一低头，看见0011的群里都是蜡烛的图片，网上翻，看到林宇去世的消息，当我抬起头，满世界都是他的影子。记忆真的如汹涌的波涛迎面而来。很多事情，我这20年从未记起过，现在却如此的生动，从我们第一次见面，到最后一次见面，我都记得很清楚。他穿衣服，他说话的样子。我真的从没想过这种情况，更没有想过他居然在我的记忆里占有如此多的如此深的位置，现在距离林宇的离世已经两个多月了，可是一想起来，我依然热泪盈眶，不能自已。

我讲几件小事。他们宿舍有一个也是来自陕西的同学，因为病被关在了精神病院，当时我们都不知道那个同学去了哪里，按理说我作为他的老乡应该去找一下他，可是我一只真的以为哪位同学已经回家了，直到有一天下午，林宇拿着一包吃的出门，我问他你去哪里，他说：“我去四院，看xxx”，我才知道林宇在这个学期，每周都去看xxx同学，而且并不告诉别人，每次都是自己带着父母给他寄来的食物去看这位同学。他在路上给我讲xxx家很困难。给我讲了xxx被关进精神病院的前因后果，其实这些我全部都不知道，也给我讲了很多这件事上的世态炎凉。毫无疑问，的的确确林宇是真心同情xxx，并且是非常善良的无私的帮助了需要帮助的人。

我们第一次见面是军训的时候，他穿着一身肥大的绿军装。我们第一次聊天的话题就是故乡。他说他上学的那个中学在民国时期，是中华民国第二中学（具体我忘记了），还问我，你们知道常熟有多少个院士么？当时我只知道我父亲的老师张光斗是常熟人，他很得意的说，常熟有20多个院士。想来他这辈子的志愿就是做学术，只是我这个土人真的没有把见面第一次说话跟一个人的志向连接起来。在大学四年，我们谈论的海阔天空，但是回想起来，他真的是一心一意搞学术，从没有想过干别的事情。

林宇还非常幽默，有一次我跟他说话的时候，他坐在桌子旁边，这时候他的桌子缝隙里爬出来一只小强，没想到他狠狠一拍桌子，大声说：“今天有客人来，你也出来丢人，赶快回去！”那个小强居然真的又钻回缝隙里了。

在大学毕业的时候，我们当时在聊出路问题，他很自豪的说：我今天跟卜东波聊了以后，他说他这就给那个清华的打电话。看我们都没有听懂，他只好说，卜东波是要给他们发拒信啊！这就是他的傲骨吧～

我们最后一次见面是我因为在本校上研究生，所以是最后一批走的，林宇走的那天，他一手抱了一个伞（到哪里都带伞是他的一个特点），一手拉着箱子，好像说了一句：”再见“，然而20年过去了，却是再也不见！

林大头，你的志向还没有完成，就这么早的离开了我们，你的音容笑貌，你的友爱善良，你的远大志向，你的诚实努力，都永远永远记在我们心里，祝你在哪里都好！

今天突然听闻林宇的消息，脑袋一晕，心头一紧，眼泪忍不住流下。。。

跟林宇一起学习已经是18年前的事了，但眼前还是他可爱的笑容。。。2004年9月-2005年6月和林宇一起在计算所学习，印象最深刻的是和他一起跟着卜老师学习《组合最优化》这门课，我们印刷了厚厚的教材，那年冬天，每周三晚上我们一起从青年公寓出发到计算所学习，然后再一起回来。当时算法还没怎么入门的我，主要是听卜老师和他讲解，他清晰的思路，详细的讲解，对算法那么深入的理解，是我仰慕和学习的榜样。他知识丰富，谈吐幽默，学习的路上经常听他谈论各种计算机大咖的成就，可以看出他对科学的向往，未来的期待。

后来研二我去了基因组所，联系就少了，2005年的国庆节本来要约着一起打牌，后来也因为我有其他事错过了，再后来他去了瑞士读博士，又去美国读博后，前段时间还听说他在澳大利亚发展的很好，没想到今天突然听到这样的消息。。。

真是的天妒英才，愿你天堂安息，我们会永远记得你。

I've known Yu since elementary school when we both attended Olympic Math club (奥数辅导班). Then we went to same high school. We run into each other from time to time. Besides all the impressive academic achievements, Yu always has a big smile and is very considerate, and encourages people with sincere heart. I'm really sorry to learn about this tragic news. Rest in peace, my friend.

Dr Yu Lin was my COMP6240 Relational Databases lecturer in 2020. At that tough moment when everyone had to but lacked confidence to take online courses, he impressed me with his detailed and professional explanation as well as his patients on course content, which made us feel amiable and also brought us hope to move forward with our online study. It was frotunate for me to meet such a kind-hearted teacher at the beginning of my study at ANU.

Thank Dr Yu Lin for his effort professional ethics, and I will always remember him.

To Yu and Family, from our family.

Tribute
All was possible,
With You it was with an EASE,
LIFE is so unpredictable,
So You remind a point,
All the GOOD remains in our hearts,
Though You are left & gone,
Wish that You'll be born among us again,
And be with us in this Samsara,
As a Kin & a Friend that never forgotten,
With a mountain of Good Deeds,
To follow and to be Remembed,
The Generous Heart You had,
Towards All did Arrived under
The umbrella of Your Great Shadow,
To be Statues of the field,
To bare the kindness You had,
To serve next gen,
To make You glitter,
High up in the field,
That we all share,
Dr. Lin will be remebered,
And never to be dead,
Till we all are alive,
And to make harmoney thrive.

7.8 billion copies of Yu
--------------------------------

Yu's death is overwhelmingly sad for me. We have lost a person of the highest quality, in a high point in his life. If each person on earth could adopt a fraction of his kindness, initiative, patience, smarts, or dependability we would start to thrive as a species. Behind his soft exterior, Yu had a powerful moral compass, strong will, and was a truly independent thinker.

Yu was a great friend. He's one of those people that I could have trusted with anything important. He was fun to laugh with, and surprised me with his willingness to go out of his comfort zone. It was a joy when I occasionally received something in the mail, or whenever he arrived in my town.

My favorite part of working with Yu, over a tall glass of oolong tea of course, was the look that he would give me when I would propose a clearly numbskull idea!

I miss Yu, and I can't help but regret how little I've seen him in recent years. I still don't believe that I can't see him again.

From Yu on my 40th birthday:

" Krister, you will always have a guarantee of tomorrow; it is already tomorrow here in Australia. Ask Bernard for yesterday once more :-) "

悼林宇
======

林宇走了，我很悲伤。

林宇是我的第一位学生，然而相互砥砺，相互激发，实则亦师亦友。

林宇是2003年来计算所的；那时我们（沈华伟、常素华）一起读Papademitriou的《组合最优化》，一起讨论算法；和春功一起写质谱分析程序---那是我们常常怀念的快乐时光。

林宇是有才气的人：本科在中科大获得郭沫若奖学金；研究生时我们一起提出了推断蛋白质质谱规律的” framentation event model”，一起提出了估计氨基酸脱氨/脱水概率的EM算法；博士期间和Moret教授一起提出了估计进化距离的新算法、重构进化树的方法，与邵明富一起提出了估计进化距离的整数线性规划算法；后来和Pavel一起提出了repeat graph以及使用长测序读段进行de novo拼接的FLYE算法。

林宇热爱教书育人：林宇去世前是澳大利亚国立大学计算机系的教授。林宇跟我说他很喜欢教书的感觉，他的课深入浅出，有口皆碑。

林宇是个善良的人：对人宽厚，律己甚严，总是屈己从人，有古君子之风。他对别人的请求不会拒绝---这或许也是他积劳成疾的一个原因吧。

上个星期五，林宇和春功微信视频，兴高采烈地说他设计了一个新的基于图论的算法，可以无错地拼接病毒基因组，正在准备RECOMB文章；我正好路过，就一起讨论了一会儿---没想到这竟然是永别。

林宇走了，我们这些认识他的人，想着他的音容笑貌，缅怀着他。

等我们这些认识他的人也走了，还有他写的文章、他写的软件在世间流传，让后人知道，有这样一个人在人世间走过。

常常听说天妒英才，常常听说世事无常。老天爷，今天我算是明白你了。

我把林宇的文章列出来，把林宇的软件列出来，用学者的方式纪念林宇---我想，这或许是纪念林宇的最好方式吧。

疫情封锁，林宇有三年没回来了；虽然常常通话，也多是讨论---我心里，还是把林宇想成从前的学生摸样，没想到他也老了，没想着叮嘱他注意身体。

林宇安息。天堂里高高兴兴的，看看书，琢磨琢磨算法，擦好黑板，拿起粉笔，等着我们吧~~~

卜东波，2022年10月于北京

我是卜东波，在中科院计算所工作。

林宇是我的第一位学生，然而我们相互砥砺，相互激发，实则亦师亦友。

我写了一幅挽联，以寄托我的哀思。

上联：多亲友多师长多良朋雅量高致君子厚德以载物

下联：通翰墨通数理通生物超逸绝伦学士才情尽风流

我对林宇的印象有两点：一曰君子，一曰才子；概括起来，就是古代所称的“士”。我加了个“学”字，以凸显学人本色。

我有时读书，读到汪曾祺的时候，江南才子，超逸绝伦，总会不由自主地想起林宇来；读到周瑜，丰神俊朗，雅量高致，也会不由自主地想起林宇来。

我和林宇志趣相投，都喜欢数学，喜欢计算机，喜欢生物；和林宇讨论问题，如沐春风，物我两忘。

和林宇相交一十九年，于我而言，实乃一幸事。

过去读过苏东坡的那4句诗：
人生到处知何似，应似飞鸿踏雪泥。
泥上偶然留指爪，鸿飞那复计东西。
不过今日才有所明白：只管留下一些印迹，鸿飞飘飘，昂然不复，无计东西。

Yu Lin is our COMP6240 teacher, who impresses us with his sense of humor and his professional knowledge, we finished this course today, yet we are still deeply saddened by his passing. I would like to send my sincere thanks and condolences to Dr. Yu Lin，林宇博士，谢谢您对于数据库课程的付出，我们永远不会忘记那些课堂上共度的时光，愿您安息。May you RIP.

I was on the hiring committee that appointed Yu, so my first meeting with him was his job interview. He was an absolute standout at every level! I was thrilled (and pleasantly surprised) when he accepted our offer and chose to move to ANU to work in an area that was new for our school. During all these years with us, he continued to do outstanding research, and taught large classes with an ease that was uncommon. He also didn't hesitate to help and support others. He was such a talented, nice, calm, and humble researcher. I will think of him often.

Yu was a dear friend and mentor of mine. We met in 2018, shortly after I joined ANU. Yu gave me lots of useful advice about teaching and research, and gave me some introduction of the university and school. Both myself and Yu taught large classes (Yu's class is even larger then mine). We discussed a lot about this. I also remember Yu told me he asked students to give feedback after every lecture and that he would carefully read the feedback and make changes. What a wonderful teaching he is!!

Yu was a modest person but did outstanding research. He always smiled and did not put presure on people. He published outstanding papers in the best venues (and a NeurIPS in 2022). His research was cutting edge. To honor him, I picked one of his papers to my lecture - his academic and personal spirit is something I should learn from.

Yu also gave advice to my wife when she felt confused in her career. My family missed him!!

Supportive and reliable colleague
Yu was a very approachable and knowledgeable person, who gave me sound advice regarding the merit of credit applications I was assessing when they contained database related courses. He also oversaw the ANU/SDUW teaching initiative where I was teaching a course. He had wise counsel for various aspects of my course. He was friendly and unassuming, while being brilliant at what he does. I will miss chatting to him. RIP Yu.

A Friendly and Reliable Colleague

I first heard about Yu from my PhD student Wei when I was with the School of Engineering. My student introduced Yu as a young and talented researcher in Bioinformatics and a very kind person. I knew Yu more after I joined School of Computing. He is always friendly and nice person to talk to. We have been working together in the scholarship ranking process for HDR students since 2021. Yu is responsible and reliable when we are discussing all applications. Yu is also a senior colleague who always likes sharing his experience. I still remember the conversations we had during the last Christmas party and he kindly shared his advice regarding the tenure conversion process and preparations. I was shocked and deeply saddened by the news of Yu’s passing. He will always be remembered as a great colleague. RIP.

Yu was one of my office neighbours on the fourth floor of our building when I came back to ANU in 2019. I was so impressed by his calm approach to academic life and his commitment to teaching well, researching well, and serving our school. I will really miss him.

Dr Yu Lin was a shining star in accelerating the 3rd generation long read sequencing. I welcomed his large contributions to this field upon his recruitment to ANU and was fortunate to work with him to generate and analyse noisy data with confidence that it could be informative long before this was well known. Yu's contribution to research and teaching touched many and his tools will ultimately enable us crack open the evolutionary and functional mysteries of the microbiome! Vale Dr Yu Lin, we all miss you.

I first met Yu during his interview visit in 2016. I vividly remember his job talk and the opening analogy of blowing up a stack of NYTimes paper and trying to put them back using the pieces -- a lively explanation of genome assembly for outsiders. The whole of his talk and interview portrays one of the highest levels of curiosity and purity in intellectual pursuit I have seen, and the impression lasted until this day.

After Yu joined the school and I got to know him a little better, I could not help but being curious on reasons one of the top young researchers of bioinformatics chose to join ANU, on an entirely new continent different from any of his previous adventures (Asia, Europe, North America). Yu shared that he saw ANU's intellectual environment as compatible with his personality and pursuit. In the years that follow, Yu's actions more than validated his initial vision. The database course was new to him, but over a few years he poured his heart and mind into both the content and organisation, won the respect and raving reviews of the massive and diverse student body, and embraced it intellectually by completing a few research projects. Although Yu's work resulted in a number of high-profile publications, such as PNAS and Nature journals, I have never heard him brag about them. Whenever we talked about research what he conveyed was the pure joy of making important advances in a new problem (Metagenomics, applied to monitoring coral reefs), or applying his cool algorithms to locally and societally relevant problems (understanding Australian reptiles). The last 3 years has not been kind to adventurous spirits like Yu, we shall keep his cheerful spirits with us when we travel, and hope these spirits help fulfil his wishes to visit Sri Lanka (where a number of his students were from) and travel around Australia and other parts of the world.

I will miss sending Yu an algorithm problem and getting an insightful reply promptly, I will sorely miss his calm smiles in the shared professional life of the school. There are big vacuums left by Yu's passing, he will be missed.