Mathematics

*\**\* This event is listed here for information only. Please join **[The 852 on Heylo](https://heylo.group/the852 "https://heylo.group/the852")** **for free** to complete **[your registration](https://heylo.com/invite/EfQoI5Qk "https://www.heylo.com/invite/Li4VDuEF4")**. \*\* Enjoy a fit, social Saturday evening at the largest pickleball venue of our new partner, [212HK](https://www.instagram.com/212hong_kong "https://www.instagram.com/212hong_kong")! Meet new friends, play games, then grab dinner & drinks at happy hour prices! 🥳 Both experienced players and newcomers are welcome—the 212HK coach will bring us up to speed! 📅 Date: Saturday, 30-May ⏰ Time: 5:00 PM 📍 Location: 212HK, 15/F S22 Building, 22 Heung Yi Road, Wong Chuk Hang. Wong Chuk Hang MTR Exit B 🎟️ **Ticket Price** Ticket includes: Entry, 2-hour racket rental, group class coaching, and game time! • Early bird offer ends on 3-May. **Early bird HK$300** \| Standard HK$350 Sign up for membership at [HK$150/month](https://buy.stripe.com/6oU6oH27RbFk6kgghV93y01 "https://buy.stripe.com/6oU6oH27RbFk6kgghV93y01") via the [Stripe link](https://buy.stripe.com/6oU6oH27RbFk6kgghV93y01 "https://buy.stripe.com/6oU6oH27RbFk6kgghV93y01"), and pay HK$150 for this event; check out on [Heylo](https://heylo.com/invite/LHK1RAm4 "https://heylo.com/invite/LHK1RAm4")! Limited capacity – first come, first served! 🏃 Come make new friends with active people and enjoy a fun-filled evening together! 🎁 Get hooked on pickleball? There's a special offer if you want to sign up on the spot! Miss that? Check out the [partner benefits for The 852 members](https://www.heylo.com/benefits/fe9e370b-b33d-4fb6-9175-271b6ad9b401/-Opf_dhI2aBjep6YmXWb "https://www.heylo.com/benefits/fe9e370b-b33d-4fb6-9175-271b6ad9b401/-Opf_dhI2aBjep6YmXWb") on Heylo. \*\*\* Register the event [here](https://heylo.com/invite/KWxoi7aM "https://heylo.com/invite/KWxoi7aM")! \*\*\* ***The 852*** *is a Fitness & Social Community that supports an active lifestyle through monthly membership pricing of HK$150. Members enjoy free weekly outdoor workouts, along with preferential rates or free entry, to select paid events.* Check out the [full schedule](https://heylo.group/the852). 😉 Follow us on [Instagram ](https://www.instagram.com/the852hk/)**[@The852HK](https://www.instagram.com/the852hk/)** [The 852 on Heylo](https://heylo.group/the852) : **https://heylo.group/the852** #The852 #The852HK #Pickleball #ActiveLifestyle #SocialActivity #NewInTown #MakeNewFriends #ExpandYourCircle

Date: 30 May 2026 (Sat) Time: 15:30 - 18:00 \*HKT Coordinator: Ming Tou, Alex Au Light Refreshments will be available! This is a **workshop** for Python Data Cleaning. Please bring along your laptop with **Python3 installed with enough battery**! *Winners will get a small prize as an accomplishment **in the next meetup**.* **Due to the university entrance policy, we are currently closed for new university QR code entrance registration. Please feel free to join us by registering yourself under the university entrance counter!** ***Mind the Data Gap*** **This model will be delayed due to: missing values, outliers, and delimiter congestion.** In this hands-on HKPUG workshop, we are turning a Python data cleaning exercise into a gamified team sprint. You will work with a **synthetic Hong Kong-inspired transport dataset**. The data is messy on purpose: missing values, weird outliers, inconsistent categories, URL-encoded station names, confusing delimiters, and fields that look useless until you extract the hidden signal. Your mission is simple: **Clean the data. Extract better features. Run the scorer. Beat the model.** You do not need to tune the model. You need to **rescue the data**. ***How the Challenge Works*** Teams will write a Python data transformation script to clean and enrich the dataset. Our scoring pipeline will then: 1. Run your transformation on the training and test data 2. Remove any label / target leakage columns 3. Train a fixed Gradient Boosting model 4. Evaluate the model using proxy metrics such as F1 and ROC-AUC 5. Convert the result into a data cleaning score This is not meant to be a perfect data quality metric. It is an accessible proxy: if your **cleaning** and **feature extraction** help the **model perform better**, your team gets a better score. **Capacity:** 60 (Team of 4) **Venue Info:** City University of Hong Kong, Kowloon Tong (Exact Location TBC) **Rundown:** **30th May** **15:30 – 15:40** Opening Remarks, Team Formation & GitHub Setup **15:40 – 15:55** Briefing: Data Traffic Report, Challenge Rules & Scoring Pipeline **15:55 – 16:20** Demo: Messy Dataset, Data Cleaning Strategy & `transform.py` **16:20 – 17:10** Team Sprint Part 1: Missing Values, Outliers & Category Cleanup **17:10 – 18:00** Team Sprint Part 2: Feature Extraction, Hidden Signals & Scoring Iterations **18:00 -** Networking outside City University **13th June** **\- 23:59** Winner Team Announcement **Audience pre-requisite:** * **Hardware:** **MUST** bring a laptop with Python 3 installed and a code editor (VS Code, PyCharm, etc.). * **Skills:** Recommended having basic to intermediate-level knowledge of Python (handling JSON, using the `requests` library, and writing basic `if/else/while` loops). **How to join?** 1. Click "Attend" on this page

亨利.穆傑的法國經典小說 +意大利19世紀末最重要的歌劇作曲家賈科莫.普契尼的著名歌劇《波希米亞人》藍本 +法語演唱。 故事：一群年輕人在 從放蕩不羈的青春 步向 肩負責任的成年 之間，如何在缺乏生活保障的情況下，依然追求藝術理想與愛情。 “Scenes of Bohemian Life” is a work by Henri Murger, published in 1851. a collection of loosely related stories, all set in the Latin Quarter of Paris in the 1840s, romanticizing bohemian life in a playful way. 2 operas were later based on the novel and play, *La bohème* by Giacomo Puccini in 1896 and *La bohème* by Ruggero Leoncavallo in 1897. Puccini's became one of the most popular operas of all time, spawning several later works based on the same story. **日期：2026年5月30日(星期六)** **時間：1)食飯:@6:15-7:00pm (可選), 2)音歌劇:@7:30-9:15pm** **地點：香港理工大學** **集合時間及地點：1)理工大學VA樓canteen; 2)賽馬會綜藝館地面層; 電聯** **座位: 自由劃位(本人會於7:30pm先排隊入場為大家獲取好座位)** **主辦單位：法國五月藝術節、理工大學、香港歌劇院** Date: 30 May, 2026 (Saturday) Time: 1) Dinner @6:15-7:00pm; 2) Opera @7:30pm-9:15pm Address: JC Auditorium in Hong Kong Poly University Assemble: 1) canteen in VA Building; 2) G/F of JC Auditorium; by call Seat: 6 people limited (Other audience in event as well) Seating: No seating is set and seats are served on first-come-first-served basis (I will queue up for good seat at 7:30pm for members) Presented by: French May Arts Festival, HK Poly University, Opera Hong Kong MeetUp費用：自由定價價值,(晚餐費另計). 報名：按Attend-> 填寫1)聯絡電話號碼, 2)男/女, 3)你願意付出此次活動費用, 4)一起用餐否?-> 確認入選活動-> 繳費(入帳恆生銀行號碼: 359-366101-882 (NG Y\*\ \*S\*\*\*)/ FPS/PayMe: 97419423)-> 再以閣下電話whatsapp(97419423)以下資料: 1)MeetUp名字, 2)過帳通知書. MeetUp fee: Free pricing as you value, (Dinner price excluded). Join: Click ‘Attend’-> Write down your 1)Contact number, 2)Male/Female, 3)Fee that you would pay for this event, 4)Meal together? -> Get confirmation of being in the event-> Pay to Hang Seng Bank acc: 359-366101-882 (NG Y\*\* S\*\*\*)/ FPS/PayMe: 97419423-> Whatsapp 1)MeetUp name, 2)Payment notification \*\*\*a) Welcome foreigners. Please remark your language if you are foreigner. [歡迎外地本地人一同熱鬧.請外地人指明語言.] \*\*\*b) Participants are required to follow instruction of the venue. [參與者要遵守場地規則,違者則有可能被邀離開.] \*\*\*c) Late comer may be restricted to admit and continue in the activity. [主辦組織不作逾候,逾時者有可能不被參加,請預早抵達.] \*\*\*d) No refund or seat transfer after payment, unless is the cancellation of activity or by our group. [交費後若未能出席參與者,繳款不獲退回及轉讓.(除非活動取消而全數退款).] \*\*\*e) Photos taken by our group during activity will be as record and promotion. [活動如有拍照,以作記錄和宣傳用途.] \*\*\*f) When there are 3 No Show, we have the right to ban you out from our groups. [凡超過3次No Show者,本組有權將該組員移離本群組.]

Learn different techniques and different media (e.g. watercolour painting, sketching with pastel, charcoal...) for different subjects (still-life, landscape, portraiture…) of different themes to produce your own portfolios for DSE, IGCSE, GCSE / A-LeveL / IB, application for universities. Only one charge and all art materials will be provided! Please RSVP call or WhatsApp Win Davies +852 9332 0424. your own portfolios for all art exams, IB, application for universities. Only one charge and all art materials will be provided! Please RSVP call or WhatsApp Win Davies +852 9332 0424.

Welcome to all levels. For the beginners, I will teach you some basic skills and demonstrate and you'll pick up easily. Practice makes perfect! We will practice the club S, 5 and fairway wood 3, 5 and the driver. Looking forward to see you and let's have fun. Sportswear is fine. The equipment and balls will be provided at the driving range. ★★PLEASE let me know through Whatsapp or Calling before u sign up or RSPV and my HK number is 93798380. Otherwise, the chance of attendance will be passed to the one who did say hi to me first. Lastly, remember to let me know 24 HOURS before the Meetup if you will be late or can't attend. Otherwise, the one who absent without notice would be blacklisted and not welcome to join this Meetup anymore. Cheers, Terry Wong

Get a great workout with a sweat-dripping dance cardio class combined with high-intensity interval training HIIT! Feel your heart rate pumping, while you jam to the beats and see yourself groove to fitness! Leave the class feeling super energised, challenged yet relaxed from a liberating dance fitness experience! WhatsApp 63344266 to book Prepayment required to secure booking www.deedreamlife.com/pricing-packages for fee info Download Dee Dream Life App for more info

When learning statistics, one of the most fundamental yet usually grossed over concepts is that of **variance** (i.e. the square of the standard deviation in normal distribution). As we know, virtually all statistical operations which measure deviations of individual values from the norm involve adding the **SQUARED differences between the two numbers**. However, very few instructors could explain why we have to use squares rather than just the absolute values of the difference (or other even powers such as 4, if the intention is to avoid the negatives). This tutorial shall cover this in a convincing manner. Secondly, while we all know the variance of a SAMPLE is arrived by dividing (n-1) of the sum of squared differences, where n is the number of observations, few can articulate the rationale behind it. This tutorial shall also prove step by step why this is case, so after this you could appreciate the logic behind this ingenious insight instead of just reciting it like a medieval myth.

Reading is important because it develops your mind and gives you excessive knowledge and lessons of life. 開卷有益！大家最近有冇讀到一啲好書呢？不如出黎分享下讀書心得呀？參加呢個讀書活動，分享好書，分享喜悅。😊 有興趣參加可以WhatsApp我：95182994

✨️🏸Happy Singles Doubles (Men's and Women's)✨️ Location: Hong Kong Ball: RSL Supreme Fee: Depends on the number of participants (split equally among participants,e.g., Total $59 2 people = $30@) (Extra administrative fee: $20) Number of Participants: Max 6 (Men: Junior High or below, Women: Happy to near Elementary) a) Participants must bring their own rackets, and registration is only open to members of this group☆ b) Members who have never participated before will have priority registration, while those who have participated can be placed on the waiting list. If no one registers within 2 days of the event being posted, the waiting list will be filled according to the order of registration. Interested parties please join to our \*\* [WhatsApp Group](https://chat.whatsapp.com/FCBdnusno62F2WhuEwO2wV?mode=gi_t) 98729086 to register! The goal is to have fun playing ball; please don't be sullen or act like a coach. If you have friends who want to have dinner together, you can join after playing badminton time.

恆常玩pickleball活動，不定期開場，target每場6-8人攤分場錢，人均低至$50/2hrs，包球拍租借，有興趣入嚟先😁 報名方法: **如果你想更深入了解其他會員/優先獲得活動名額及資訊，歡迎填妥[簡單表格](https://forms.gle/VuduPPGrMwCFiY2S9)加入Whatsapp會員限定群組，連結：** https://forms.gle/VuduPPGrMwCFiY2S9 本群（Fun & Positive Hong Kong X L&G）旨在協助大家輕鬆快樂交友，排憂解難，擴闊社交圈子，成為大家繁忙生活中嘅一片可以抖下氣嘅綠洲😉大家等緊你呀！～🤗🥳😉👍 **Your Pal,** **Fun & Positive Hong Kong X L&G Admin Team🥳😎**

**Total beginners** **welcome!** A whole new movement, fitness & self defense cultural activity **outdoors!** Structured progressive practices for **Strength**, **Flexibility,** **Coordination** & **Self Defense** skills in a fun group environment! Totally NOT what you expect, **serious cardio**, **whole body movement** & **practical!** You will really be surprised by what WE do but even more by what YOU can do! Nothing like what you imagine about Kung Fu, No screaming, No rigidness, No mysticism & No getting hit… but YES, definitely a fun workout with great people! **Curious?** To get an ideal of what class is like, hear instructor & hear student testimonials go to [https://www.instagram.com/natural.style.kungfu](https://www.instagram.com/natural.style.kungfu) **FEE:** 1st time TRIAL fee of $100 HKD for residents. Please RSVP here or Whatsapp me. Non-Resident $150 HKD. After trial 10 class package is $1500 HKD or $200 HKD single class. **WEAR:** Workout clothing, sports shoes & bring bottle of water! **WHEN:** Sunday 5:45 pm NEW people, 6 pm students. Please be on time, warm up very important for your 1st class! **WHERE:** Inside Kowloon Park. Meet at McDonalds across from Indoor Swimming Pool entrance, next to Sports Center. MTR: Tsim Sha Tsui, Jordan, or Austin. Link below: [Kowloon Park Swimming Pool](https://maps.apple.com/?address=22%20Austin%20Rd,%20Tsim%20Sha%20Tsui,%20Kowloon,%20Hong%20Kong%20SAR,%20China&auid=15054175802527892571&ll=22.301815,114.170365&lsp=9902&q=Kowloon%20Park%20Swimming%20Pool&_ext=CjIKBAgEEAUKBAgFEAMKBQgGEKcBCgQIChAACgQIUhADCgQIVRAQCgQIWRADCgUIpAEQARIkKSODum0jNjZAMWByPQiohFxAORGqqD1gZDZAQaw+9nwmkVxA&t=m) **WHY:** Out of shape? Gym BORING? More? You want to exercise & have fun building strength, flexibility, coordination & self-defense skills while cultivating patience, focus, confidence & yes… discipline! **HOW:** To get in touch with me, Whatsapp .9420.0360. or email through Meetup. For more info about my art, please visit NaturalStyleKungfu.com. **\- Book a Private 1\-on\-1 Kungfu Class\!** Learn at your own pace & prepare for later group classes, choose the day & time suitable to you! Private Class in Kowloon Park: 1.5 Hours $500, other locations $900 **-**

Topic to be announced. **THANK YOU** *Franklin University* for hosting our meetup! To learn more about *Franklin University*, please visit their website: https://www.franklin.edu/ **DIRECTIONS** Franklin University Fisher Hall 300 E. Main St, Columbus, OH 43215 Map: https://maps.app.goo.gl/jxjBA2hUmS5qrvhq8 Parking is FREE! Please park in Lot C in front of Fisher Hall. See attached map. NOTE: Map the address only. When mapping with Google Maps it may use the Fisher Hall at OSU, which is NOT correct. **Want to sponsor the pizza and/or bar tab?** Please contact me if you would like to sponsor this meetup's pizza and/or bar tab: angelo@mandato.com

Jimmy V's Grill & Pub in Grandview Heights. You are responsible for your own meal/drinks. We usually don't have any agenda other than eat, drink and talk. :) If the weather is nice we will be on the back patio, otherwise we are in the cigar room. This group has been meeting every Tuesday evening for over a decade. Many attendees do not RSVP on meetup. Please don't let the small number here discourage you. Anyone/everyone is welcome to come. We'd love to have you join us. COTA bus #5 comes to W. 5th and Wyandotte Rd. And it's a minute walk to the restaurant.

Join us Tuesday (6/2) at 6:30 pm as we hike the Hundred Acre Woods in Westerville. This is a beautiful trail that is filled of hills and roots but a picturesque wooded landscape to hike. Wear your hiking boots if you have them. We will do 2 loops of the 1 mile trail.

**Pagans on the Patio! Summer/Fall Series** A casual gathering the first Thursday of each month. Time to relax, meet new people, and reconnect with old friends. There is no charge for the event itself and all are welcome but there are a few guidelines: 1. **You are expected to purchase food and/or drink to compensate the Cantina and our server.** 2. **No soliciting. Do not bring samples of your wares or brochures of your services.** 3. **Please respect the spiritual and political views of others that are present. No disruption of the peace.** In case of inclement weather, we will find seating indoors. I hope to see you there. Blessed be! \~ Cynthia ❤️---

Who’s up for a pizza night at the highly requested Pizza House? 🍕🍻 Join us at for great pizza, good laughs, and even better company! Come hungry and ready for a cheesy good time.

Main Library, Meeting Room 2B Join us for a welcoming evening of reflection, gentle music, and meaningful conversation. We’ll begin with a short grounding moment, followed by a brief reading from spiritual or philosophical traditions, and an open reflection circle where participants can share (or simply listen). Libera Animae is an interfaith community focused on inner growth, creativity, and authentic connection. All backgrounds are welcome.

We may pick a specific topic and post in advance or may discuss current events and various ad hoc topics . We would love to spend time hanging out and getting to know one another. Atheist, agnostics, other non-theists, and atheist-friendly people are welcome to join us. Note: COUNT operates a Facebook page at www.facebook.com/groups/COUNT.discussions (http://www.facebook.com/groups/COUNT.discussions/) to promote discussions among members and visitors.