I am a research scientist at Google Research. Previously I was a postdoctoral researcher at Empirical Inference Department, Max Planck Institute for Intelligent Systems working with Bernhard Schölkopf (from 2018 to 2020). I work in the field of machine learning (intersection of computer science and statistics). My research topics include (but not limited to)

  • Fast (linear runtime) non-parametric statistical tests
  • Kernel-based representation of data
  • Deep generative modelling of images
  • Approximate Bayesian inference
I completed my PhD study in 2017 at Gatsby Unit, UCL where I worked with Arthur Gretton on various topics related to kernel-based statistical tests and approximate Bayesian inference. Please feel free to check out my list of publications, software and contact me for a research discussion.

Contact: Wittawat Jitkrittum (วิทวัส จิตกฤตธรรม) ( )

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27 Jul 2020

:computer: We have released Python source code for our work “Testing Goodness of Fit of Conditional Density Models with Kernels” (in UAI 2020). Please check it out!

10 Jul 2020

:couple: Today is the last day of the virtual Machine Learning Summer School 2020. On behalf of the organizing team, I would like to thank all parties involved including our valued sponsors, our speakers, volunteers, and staff at the MPI-IS. All lectures are online. Please feel free to check here!

15 May 2020

:v: Two papers accepted to UAI 2020: “Testing Goodness of Fit of Conditional Density Models with Kernels” and “Kernel Conditional Moment Test via Maximum Moment Restriction”.

1 May 2020

:man_scientist: I joined Google Research as a research scientist. I would like to thank everyone who has supported me.

2 Apr 2020

:memo: A new preprint: Worst-Case Risk Quantification under Distributional Ambiguity using Kernel Mean Embedding in Moment Problem with J. J. Zhu and colleagues.

25 Feb 2020

:memo: :v: Two new preprints, both tackling the problem of testing the goodness of fit of a conditional model. In the first work, the model is specified as an explicit conditional density function up to the normalizing constant. In the second work, the conditional model is specified implicitly in terms of a conditional moment function.

2 Jan 2020

:school: I am co-organizing the Machine Learning Summer School (MLSS) 2020 at the Max Planck Institute for Intelligent Systems, Tübingen, Germany. Application is now open! Please apply. Deadline: 11 Feb 2020.

10 Dec 2019

:video_camera: Recorded tutorial on interpretable comparison of distributions and models at NeurIPS 2019. Video. Slides (part 1, part 2, part 3).

9 Dec 2019

:speaker: I will give a tutorial (with Dougal Sutherland and Arthur Gretton) at NeurIPS 2019 on Mon Dec 9th 11:15 - 13:15 @ West Hall A. The topic will be “Interpretable Comparison of Distributions and Models”. See the event here.

29 Oct 2019

:bullettrain_front: I am invited to give a talk at Swiss Data Science Center. I will speak on informative features for comparing probabilistic models. Slides here. Talk recording here.

14 Oct 2019

:memo: A new preprint titled ABCDP: Approximate Bayesian Computation Meets Differential Privacy. We study the interplay between the ABC similarity threshold $\epsilon_{abc}$ and the privacy loss $\epsilon_{dp}$ in differential privacy. Our results show that increasing $\epsilon_{abc}$ (i.e., fast, inaccurate posterior samples) reduces privacy loss, agreeing with our intuition that inaccurate posterior samples reveal less about the underlying sensitive data.

4 Sep 2019

:bowtie: I am honored to be selected to receive ELLIS PhD Award for my thesis titled “Kernel-Based Distribution Features for Statistical Tests and Bayesian Inference”. I would like to thank Arthur Gretton (my PhD supervisor), everyone I met in my PhD journey, and the selection committee who made this possible.

3 Sep 2019

:v: Two papers accepted to NeurIPS 2019.

1 Sep 2019

:airplane: I will attend DALI 2019 from 3-6 September 2019 in San Sebastian, Spain. Looking forward to meeting everyone!

11 Aug 2019

:two_men_holding_hands: :two_women_holding_hands: The first Machine Learning Research School 2019 has concluded. On behalf of the organizing team, I would like to thank all our valued sponsors, all the speakers, the four organizing partners, members of the organizing team, volunteers, and all the participants. The event was a success because of the joint effort from all the involved parties. Stay tuned for the news on the future iteration of the event. :v:

3 Jul 2019

:memo: A new preprint “A Kernel Stein Test for Comparing Latent Variable Models”. The kernel Stein discrepancy (KSD) test proposed in Liu et al., 2016 and Chwialkowski et al., 2016 allows one to test the goodness of fit an unnormalized differentiable density model. However, when the model is a latent-variable model with an intractable marginal density, the KSD test cannot be applied easily. In our new work, we extend the KSD test to allow goodness-of-fit testing of latent-variable models whose marginal densities may be intractable.

8 Jun 2019

:airplane: I will attend ICML 2019 (9-15 June 2019) and CVPR 2019 (16-20 June 2019). If you would like to meet and discuss research, please feel free to send me a message.

16 May 2019

:green_book: Our paper “Kernel Mean Matching for Content Addressability of GANs” (ICML 2019) is now online on arXiv. The link is here. Code coming soon!

7 May 2019

:bowtie: I am a co-organizer of the first Machine Learning Research School (MLRS) 2019 to be held in Bangkok, Thailand on 4-11 August 2019. Application is now open. Deadline: 31 May 2019. All welcome to apply! See also our MLRS facebook page.

22 Apr 2019

Our paper titled “Kernel Mean Matching for Content Addressability of GANs” has been accepted to ICML 2019. This work proposes a procedure which adds “content addressability” to any pre-trained implicit model (including GANs). Given a set of input images, the procedure can generate images (from the chosen implicit model) that are similar to the input images, without retraining the model.

Last update: 27-Jul-20
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