Show HN: Deterministic objective Bayesian inference for spatial models [pdf] https://ift.tt/2I8NOb1

Show HN: Deterministic objective Bayesian inference for spatial models [pdf] To give some context, objective Bayesian inference refers to Bayesian analysis (i.e. integrating over the parameter space) using a prior that is design to represent "minimal information" (see [1], [2], and [3] for an overview). Particularly in cases where a model's likelihood function is not strongly peaked about a point, objective Bayesian inference can give better results than methods based off of point estimates like Maximum Likelihood [4]. Reference priors provides a general approach to construct so-called noninformative priors that are suitable for Objective Bayesian analysis ([5], [6]). The approach takes a practical viewpoint of noninformative priors and looks to build priors that are both tractable and provide good performance on frequentist coverage simulations. See Section 2 for a description of how the process and frequentist simulations work and [7] for examples with some basic models (e.g. why 1/σ^2 is the noninformative prior for the variance of normally distributed data with known mean). [8] was the first to develop reference priors for Gaussian processes models, and [9] extended the work to handle Gaussian Processes with noise (or nugget effects). The project I'm working on provides software and algorithms to do deterministic inference using the prior from [9]. Typically, such inference has been done using MCMC sampling algorithms; but my belief is that deterministic algorithms can give results that are more consistent, less sensitive to parameter tweaking, and more efficient, at the expense of some engineering cost and loss of generality. For an example of how the algorithms work on a real-world data set of zinc measurements in a flood plain along the Meuse river [10], see https://ift.tt/p93YhcB... References [1]: https://ift.tt/mkaHWfl [2]: https://ift.tt/8G6LEQD... [3]: https://ift.tt/1h0b4Qv [4]: https://ift.tt/gIeh3zR... [5]: https://ift.tt/4ZMR3uF... [6]: https://ift.tt/RCg1Jpx [7]: https://ift.tt/ykYPrFR... [8]: https://ift.tt/A7c8pTw... [9]: https://ift.tt/LO159cT... [10]: https://ift.tt/bKyks7x... https://ift.tt/ykncjJT May 10, 2023 at 08:37PM

Meet the People of the Next Generation CIS: Leon Yu

Meet the People of the Next Generation CIS: Leon Yu
By Deanna Leo

Leon Yu, Graphic Artist, Creative Services  

What do you do on the project? 

I help design the user experience: What users see on the new displays, how they see it and how often they see it, down to the actual graphics.  

How do you feel your work impacts our customers? Who will benefit? 

My work communicates transit information to customers as cleanly and clearly as possible, so the information is easy for any member of the public to understand. We only have a small space to work with on the displays, so we must make it count. People  of all backgrounds, languages and abilities, so need to get this information quickly at a glance.  

What was your favorite part of the project? 

My favorite part is working with the team and all the different CIS systems. This is such a multidisciplinary project involving many staff and people I’ve never worked with before. Being able to collaborate with so many dedicated colleagues is rewarding.  

What do you like most about working at the SFMTA? 

As a graphic designer, my work is always on display. Being able to see my work in public and see Muni riders engage with my work to get information that helps them with their trip is exciting and satisfying.  

To learn more about this challenging and important project visit the project home page (SFMTA.com/NextGenCIS).   

Published May 11, 2023 at 01:04AM
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Show HN: Mineo.app – Better Python Notebooks https://ift.tt/PnS7zIv

Show HN: Mineo.app – Better Python Notebooks Hello everyone, I would like to introduce our startup to HN: Mineo.app. Mineo.app is a production-ready SaaS Python notebook that provides a complete environment for building your data applications: Dashboards, Reports, and Data Pipelines based on Python notebooks. Key features: * Superpowered jupyter-compatible Python notebooks with extra goodies like: version control, commenting support, custom docker images, etc... enhanced with no code components that allow to create beautiful dashboards and reports. * Data Pipelines: Ability to schedule and run one or more notebooks. * Integrated file system to manage your files and projects with detailed permissions and groups. We have a freemium licensing model, so you can start using Mineo just by registering with your Github/Google/Microsoft account for free without a credit card. And it's free for educational purposes ;-) Diego. https://www.mineo.app/ May 9, 2023 at 06:49PM

Show HN: Askhn.ai – generate answers based on expertise on HN https://ift.tt/1z5Hgv2

Show HN: Askhn.ai – generate answers based on expertise on HN https://askhn.ai/ May 10, 2023 at 04:40PM

Show HN: A clock app developed based on flutter https://ift.tt/H9y6IQ8

Show HN: A clock app developed based on flutter https://ift.tt/iw9dYmC May 10, 2023 at 09:30AM

Show HN: Build progressively enhanced reactive HTML apps using Go and Alpine.js https://ift.tt/ALEawp5

Show HN: Build progressively enhanced reactive HTML apps using Go and Alpine.js Fir leverages Golang’s standard library html/template package and a bit of alpinejs to allow building reactive UIs. You start with plain old html and use alpinejs to enhance it to bring no-page-reload interactivity to web apps. The Fir toolkit is designed for Go developers with moderate html/css & js skills who want to progressively build reactive web apps without mastering complex web frameworks. It includes a Go library and an Alpine.js plugin. How it works ? On receiving user-interactions the fir server re-renders html templates and sends it over the wire where the fir client library selectively updates the changed areas. When a user event is received by a Fir route, an array of html templates are rendered on the server and returned as an array of DOM events to the browser. The DOM events are consumed by the alpinejs plugin and dispatched within the DOM where listeners attached to elements can use the event to update the DOM. See the demo and quickstart here: https://ift.tt/AZQMI09 https://ift.tt/AZQMI09 May 10, 2023 at 05:33AM

Show HN: Card game where players write their own cards that get parsed into code https://ift.tt/Te6GUdj

Show HN: Card game where players write their own cards that get parsed into code Wordbots is a long-running side project I've been working on on-and-off for the past ~7 years that I finally feel comfortable enough with to share with the HN community. It's an online tactical card game (inspired by games like Hearthstone and Magic: the Gathering), where players write their own cards in natural language, that gets parsed down to JavaScript. The English-to-JavaScript translation is handled by a semantic parser operating on a hand-crafted CCG grammar – kind of an “old-school” approach in this age of LLMs but one that performs quite well on the very constrained language of Wordbots cards. The resulting game gets pretty wacky as players can create all sorts of cards, though there are some game formats that try to produce more balanced gameplay as well (e.g. one format in which both players shuffle their decks together, and various draft formats). If you're curious about how it all works, I made a write-up about it here: https://ift.tt/qHN05Ue And if you want to chat about Wordbots beyond this thread, please don't hesitate to join our discord at https://ift.tt/5TtgsrX . I'd love to hear any and all feedback. -Alex https://ift.tt/rz3TC7q May 10, 2023 at 01:01AM