We’re excited to announce Advent of Tensors 2025 — a 24-day coding challenge for anyone curious about tensors.
About the Challenge
- Starting 1 December 2025, we’ll share one tensor challenge per day for 24 days.
- Each challenge is short, hands-on, and designed to help you get comfortable with multi-dimensional arrays, reductions, and related concepts.
- Participants will solve the challenges using Vespa Tensor Expressions.
- You can submit your solution via the provided form. Those who complete the most challenges will have a chance to win some prizes (Winners will be contacted in the new year!).
- You don’t have to do all 24 challenges — participate at your own pace.
Why Participate?
- Learn by doing: Gain practical experience working with tensors.
- Practice problem-solving: Explore different ways to tackle each challenge.
- Win prizes: There are rewards for those who complete the most challenges.
How to Get Started
- Note 1 December 2025 on your calendar.
- Check back daily in this blogpost for a new challenge, in the table below.
- Solve the challenge and submit your solution via the Google Form link found here or in the daily challenge.
- Join the Vespa Slack Community to discuss solutions and share tips.
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Challenges
| Day | Challenge | Solution |
|---|---|---|
| 🎄 Day 1 | Santa’s Budget | Solution |
| 🎄 Day 2 | Shopping Spree | Solution |
| 🎄 Day 3 | Reality Check | Solution |
| 🎄 Day 4 | Mapping the Sleigh Ride | Solution |
| 🎄 Day 5 | Cookie Greediness | Solution |
| 🎄 Day 6 | Percentage Cookie Weight | Solution |
| 🎄 Day 7 | Elf Height Gap | Solution |
| 🎄 Day 8 | Sorting Sweaters | Solution |
| 🎄 Day 9 | Fastest Gift Wrapper | Solution |
| 🎄 Day 10 | Total Sleigh Volume | Solution |
| 🎄 Day 11 | Lifting Together | link |
| 🎄 Day 12 | Christmas Light Pattern | link |
| 🎄 Day 13 | Back-and-Forth Lights | link |
| 🎄 Day 14 | Hamming Disaster | link |
| 🎄 Day 15 | Naughty Scroll Spam | link |
| 🎄 Day 16 | Lightest Reindeer | link |
| 🎄 Day 17 | Chimney Openings | link |
| 🎄 Day 18 | Red Hat Ceremony | link |
| 🎄 Day 19 | Sleigh Flight Distance | link |
| 🎄 Day 20 | Johnson Kids’ Gift Eligibility | link |
| 🎄 Day 21 | Sibling Gift Fairness | link |
| 🎄 Day 22 | Joy Meter | link |
| 🎄 Day 23 | The Gifts That Keep On Giving | link |
| 🎄 Day 24 | White Christmas? | link |
Final Note
This is all about learning and having fun, not racing to finish first. Grab your laptop, maybe a cup of cocoa, and enjoy 24 days of tensor practice.
See you on 1 December!
