Winners of the Doxa AI Matching Challenge

It’s all over!

The Matching Challenge is now officially closed. Thank you to everyone who took part.

The wait is over! We have now closed the Matching Challenge which was hosted on DOXA AI. Over the course of the competition we saw a total of 26 participants with 14 finalists making it onto the scoreboard. The final days were tense with many participants improving on their scores, submitting different methods and swapping places at the top of the scoreboard.

The final scoreboard:

..and the winners are…

1st Place 🏅
José Inés Martínez Berard ‘End’ @oreug, with an impressive MAE (mean absolute error) of 20.348
Prize: £500 in Amazon Vouchers
Congratulations! look out for an email from us with your prize

2nd Place 🥈
Rafi Ahmed Riyaz Ahmed Patel @rafa, with a very close 2nd place MAE of 20.544
Prize: £250 in Amazon Vouchers
Well done 👏👏👏 your prize will be emailed to you soon

A big thank you to everyone else that took part in the competition, if you weren’t successful this time round, fear not, as our next competition is already open and the prizes are even BIGGER!

Above: watch a video interview with José and Rafi, winners of the challenge.

Join our next challenge

Harmony: PDF Parsing Challenge. Develop an improved algorithm for identifying mental health survey questions.

Join our Discord

Join the Harmony Discord server. Check out the 🏅「parsing-challenge」 channel!

See other events

23 January 2025: Harmony at AI for Good at Newspeak House
22 November 2024: Harmony at Women In Data™️ London Chapter
8 October 2024: Harmony: a free online tool using LLMs for research in psychology and social sciences at AI|DL London
11 and 12 September 2024: Harmony at MethodsCon Futures in Manchester
2 July 2024: Harmony: NLP and generative models for psychology research at Pydata London
3 June 2024: Harmony Hackathon at UCL
5 May 2024: Harmony: A global platform for harmonisation, translation and cooperation in mental health at Melbourne Children’s LifeCourse Initiative seminar series.
27 March 2024: Harmony at AI Camp
17 August 2023: Harmony and TIDAL workshop

Sign up for our next competition on DOXA AI

Enter the competition on DOXA AI: Your challenge is to develop an improved algorithm for identifying mental health survey questions and selectable answers in plain text.

Improving Harmony's PDF extraction with user testing

Since we built Harmony, a common complaint has been that it frequently identifies the wrong questions in PDFs. The original algorithm for finding questions in PDFs was a mixture of rule based heuristics and some hand coded logic to look for e.g. lines in the document which begin with numbers. This was very fragile and worked fine on short questionnaires such as the GAD-7, but failed on larger documents. We decided to run a competition with our partner DOXA AI where members of the public could train their own model to extract questions from PDFs.

Harmony at MQ and DataMind Data Science Workshop

Harmony at MQ and Datamind Data Science workshop On 2 May 2025, Dr Eoin McElroy demonstrated Harmony at the MQ and Datamind Data Science workshop in Deutsche Bank. Eoin’s presentation focused on “Maximising the use of existing survey data: facilitating cross-study research using retrospective harmonization.” The workshop brought together researchers interested in applying novel harmonisation techniques to existing datasets. Eoin explained traditional harmonisation processes and presented a user-friendly guide to the Harmony tool, demonstrating how natural language processing can streamline the harmonisation process.