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Category: Mechanical Engineering

Open Sourcing TensorFlowOnSpark: Distributed Deep…

By Lee Yang, Jun Shi, Bobbie Chern, and Andy Feng (@afeng76), Yahoo Big ML team Introduction Today, we are pleased to offer TensorFlowOnSpark to the community, our latest open source framework for distributed deep learning on big-data clusters. Deep learning (DL) has evolved significantly in recent years. At Yahoo, we’ve found that in order to gain insight from massive amounts of data, we need to deploy distributed deep learning. Existing DL frameworks often require us to set up separate clusters…

Search at Slack – Several People Are Coding

On average, 20% of a knowledge worker’s day is spent looking for the information they need to get their work done. If you think about a typical work week, that means an entire day is dedicated to this task! To help our users find more time in their day, the Search, Learning, and Intelligence team set out to improve the quality of Slack’s search results. We built a new personalized relevance sort and a new section in search called Top…

Is fNIRS the Key to Locked-In Syndrome?

Everybody has something or other they fear the worst.  For Indiana Jones, it was snakes.  Surely high on many people’s lists of horrors is the fate of falling victim to “locked-in syndrome,” which is often the outcome of amyotrophic lateral sclerosis, a disease that results from the death of motor neurons.  Two famous sufferers from the disease were baseball player Lou Gehrig (which is why it’s sometimes called “Lou Gehrig’s disease”) and physicist Stephen Hawking, who has survived for more…

Californians Talk To Their Cars

The citizens of the U. S.’s most populous state have long had a love affair with the automobile.  Life in Los Angeles is well-nigh impossible without wheels of some kind, and many commuters spend almost as much time in their cars as they do on the job.  As of Jan. 1, it is illegal in the state of California to use your mobile phone while driving unless you use hands-free technology.  Fortunately for the millions who will now have to…

Are We Ready For an AI World?

The other day I was making some hotel reservations, and set them up with two different hotel chains.  One is universally pet-friendly (we often travel with a dog), and you can call the hotel you want to stay at and talk with the desk clerk directly to make your reservation.  The clerk gets into their reservation system and takes your information and usually there’s no problem, although if you call at a busy time it can be a little stressful…

How We Cleaned Up And Ranked Our Listeners’ Favorite Albums of 2016

All Songs Considered asks listeners for their favorite albums of 2016 At the beginning of December 2016, All Songs Considered followed a nice tradition and asked listeners for their favorite albums of 2016. Users could enter up to five different albums in a Google form, ranked according to their preferences. The poll was open for eight days and resulted in more than 4,500 entries. In the end, the All Songs Considered team wanted a ranked list of the best albums.…

A specific trick and a general habit for achieving fast computations – Wealthfront Engineering Blog

I recently worked on a computation involved in a client-facing projection graph. In order to delight our users, we wanted it to respond instantly to user interaction. However, there are two forces at play that make the calculation complicated: the consistent contributions of recurring deposits and the erratic motion of stock prices. We needed to calculate a variable of the form [y_t = sum_{i=0}^tsum_{j=0}^t a_ib_je^{k(t-max(i, j))}] for all months $t$ from 0 (today) to $T$ (retirement). This quantity $y_t$ is…

SEO Title Tag Optimization at Etsy: Experimental Design and Causal Inference

External search engines like Google and Bing are a major source of traffic for Etsy, especially for our longer-tail, harder to find items, and thus Search Engine Optimization (SEO) is important in driving efficient listing discovery on our platform. We want to make sure that our SEO strategy is data-driven and that we can be highly confident that whatever changes we implement will bring about positive results. At Etsy, we constantly run experiments to optimize the user experience and discovery…

Freezing Time – Lyft Engineering

– “Time doesn’t exist, clocks exist” There are many features at Lyft where it’s critical to have an accurate (and trustworthy) time source. This apparently trivial requirement presents a few challenges when the timestamp comes from a device we can’t control: Can we trust the clock? Is the clock synchronized with an accurate time source? Can we ensure that the request to our APIs containing the timestamp was not tampered with? This post will focus on the first challenge, which is…

Commoditizing Music Machine Learning : Services

Five years ago, music personalization at Spotify was a tiny team. The team read papers, developed models, wrote data pipelines and built services. Today personalization involves multiple teams in New York, Boston & Stockholm producing datasets, feature engineering and serving up products to users. Features like Discover Weekly and Release Radar are but the tip of a huge personalization iceberg. One thing we have noticed is the overhead of running services. Services are easy to launch but have a very real…