Language Log

Janelle Shane, "Once again, a neural net tries to name cats", 6/3/2019:

Last year I trained a neural net to generate new names for kittens, by giving it a list of over 8,000 existing cat names to imitate. Starting from scratch, with zero knowledge of English or any context for the words and letter combinations it was trying out, it tried to predict what letters might be found in cat names, and in which order. Its names ranged from the strange to the completely nonsensical to the highly unfortunate (Retchion, Hurler, and Trickles were some of its suggestions). Without knowledge of English beyond its list of cat names, it didn’t know what letter combinations to avoid.

So I decided to revisit the cat-naming problem, this time using a neural net that had a lot more context. GPT-2, trained by OpenAI on a huge chunk of the internet, knows which words and letter combinations tend to be used together on the English-language internet. It also has (mostly) figured out which words and letter combinations to avoid, at least in some contexts (though it does tend to suddenly switch contexts, and then, yikes).

Read the whole thing — with pictures! Apparently the Morris Animal Refuge is using this algorithm to name the animals it offers for adoption.

Power-law distributions seem to be everywhere, and not just in word-counts and whale whistles. Most people know that Vilfredo Pareto  found them in the distribution of wealth, two or three decades before Udny Yule showed that stochastic processes like those in evolution lead to such distributions, and George Kingsley Zipf found his eponymous law in word frequencies. Since then, power-law distributions have been found all over the place — Wikipedia lists

… the sizes of craters on the moon and of solar flares, the foraging pattern of various species, the sizes of activity patterns of neuronal populations, the frequencies of words in most languages, frequencies of family names, the species richness in clades of organisms, the sizes of power outages, criminal charges per convict, volcanic eruptions, human judgements of stimulus intensity …

My personal favorite is the noises it makes when you crumple something up, as discussed by Eric Kramer and Alexander Lobkovsky, "Universal Power Law in the Noise from a Crumpled Elastic Sheet", 1995 ) referenced in "Zipf and the general theory of wrinkling", 11/15/2003).

Contradicting the Central Limit Theorem's implications for what is "normal", power law distributions seem to be everywhere you look.

Or maybe not?

A recent radio presentation: "The Law of Languages", Living on Earth 5/31/2019.

Other mass media: "Dolphins, aliens, and the search for intelligent life", Astrobiology 8/29/2011; "Dolphin Studies Could Reveal Secrets of Extraterrestrial Intelligence", 9/2/2011; To talk with aliens, learn to speak with dolphins", Wired 2/15/2011; "SETI Evolution: Searching for Aliens Using Whale Songs and Radios", Space.com 7/2/2013; "Dolphins Are Helping Us Hunt for Aliens", Nautilus 5/28/2018; "The Law all Languages Obey", Nova 9/26/2018; "Humpback Whale Communication and the Search for Alien Intelligence", SETI Institute 11/28/2018; "Humpback whales could hold the key to communicating with alien intelligence, say experts", Metro 12/6/2018; "What humpback whales can teach us about alien languages", Vox 12/6/2018.

Following up on Saturday's post "Towards automated babble metrics", I thought I'd try the same technique on some adult speech, specifically William Carlos Williams reading his poem "The Red Wheelbarrow".

Why might some approach like this be useful? It's a way of visualizing syllable-scale frequency patterns (roughly 1 to 8 Hz or so) without having to do any phonetic segmentation or classification. And for early infant vocalizations, where speech-like sounds gradually mix in with coos and laughs and grunts and growls and fussing, it might be the basis for some summary statistics that would be useful in tracing a child's developmental trajectory.

Is it actually good for anything? I don't know . The basic idea was presented in a 1947 book as a way to visualize the performance of metered verse. Those experiments didn't really work, and the idea seems to have been abandoned afterwards — though the authors' premise was that verse "beats" should be exactly periodic in time, which was (and is) false.  In contrast, my idea is that the method might let us characterize variously-inexact periodicities.

There are lots of good reasons to want to track the development of infant vocalizations — see e.g. Zwaigenbaum et al. "Clinical assessment and management of toddlers with suspected autism spectrum disorder" (2009). But existing methods are expensive and time-consuming — see e.g. Nyman and Lohmander, "Babbling in children with neurodevelopmental disability and validity of a simplified way of measuring canonical babbling ratio" (2018).  (It's also unfortunately true that there's not yet any available dataset documenting the normal development of infant vocalizations from cooing and gooing to "canonical babbling", but that's another issue…)

People are starting to make and share extensive recordings of infant vocal development — see e.g. Frank et al., "A collaborative approach to infant research: Promoting reproducibility, best practices, and theory‐building" (2017). But automatic detection and classification of vocalization sources and types is still imperfect at best. And if we had reliable detection and classification methods, that would open up a new set of questions: Are the standard categories (e.g. "canonical babbling") really well defined and well separated? Do infant vocalizations of whatever type have measurable properties that would help to characterize and quantify normal or abnormal development?

A couple of years ago, in connection with the JSALT2017 summer workshop, I tried several commercial speech-to-text APIs on some clinical recordings, with very poor results. Recently I thought I'd try again, to see how things have progressed. After all, there have been recent claims of "human parity" in various speech-to-text applications, and (for example) Google's Cloud Speech-to-Text tells us that it will "Apply the most advanced deep-learning neural network algorithms to audio for speech recognition with unparalleled accuracy", and that "Cloud Speech-to-Text accuracy improves over time as Google improves the internal speech recognition technology used by Google products."

So I picked one of the better-quality recordings of neuropsychological test sessions that we analyzed during that 2017 workshop, and tried a few segments. Executive summary: general human parity in automatic speech-to-text is still a ways off, at least for inputs like these.

Eliza Strickland, "How IBM Watson Overpromised and Underdelivered on AI Health Care", IEEE Spectrum 4/2/2019 (subhead: "After its triumph on Jeopardy!, IBM’s AI seemed poised to revolutionize medicine. Doctors are still waiting"):

In 2014, IBM opened swanky new headquarters for its artificial intelligence division, known as IBM Watson. Inside the glassy tower in lower Manhattan, IBMers can bring prospective clients and visiting journalists into the “immersion room,” which resembles a miniature planetarium. There, in the darkened space, visitors sit on swiveling stools while fancy graphics flash around the curved screens covering the walls. It’s the closest you can get, IBMers sometimes say, to being inside Watson’s electronic brain.

As promised, the results of yesterday's little experiment on "Coherence of sentence sequences" are here.

A tabular summary:

So the survey respondents (as a whole) guessed the original order of all twelve sentence-pairs correctly — though the margins varied from 2-to-1 to 99-to-1. The overall percent correct was 89%, though of course that percentage will depend on the particular mix of examples.

(The counts don't all sum to the same row-wise value because a couple of participants left some answers blank — there's probably a way to get Qualtrics to prevent that, but I didn't figure it out in time…)

Here are two successive sentences from The Wizard of Oz, presented in two different orders:

1. "How strange it all is! But, comrades, what shall we do now?"
2. "We must journey on until we find the road of yellow brick again," said Dorothy, "and then we can keep on to the Emerald City."

The first order (in blue) is easier to construe as a coherent sequence, because in that order, sentence 2 answers a question posed by sentence 1. The version in red could be rescued by a more complicated set of contextual assumptions or a more complicated theory of the interaction — but in fact it's the blue version that's the original.

An article I'm writing led me to wonder when the idea of a conversing automaton first arose, or at least was first published. I'm ruling out magical creations like golems and divine statuary; brazen heads  seem to have either been magical or created using arcane secrets of alchemy; I don't know enough to evaluate the legend of King Mu and Yen Shih's automaton, whose conversational abilities are not clearly described in the texts I've found.

There are many early documented automata doing things like playing music, and plenty of enlightenment philosophizing about what human abilities might or might not be clockwork-like, so I would have thought that there would be plenty of fictional conversing automata over the past four or five hundred years.

But apparently not: it's possible that the first real example was as late as 1907 or even 1938.

I'm spending a couple of days at the DARPA AI Colloquium — about which more later —  and during yesterday's afternoon session, I experienced an amusing conjunction of events. Pedro Szekeley gave a nice presentation on "Advances in Natural Language Understanding", after which one of the questions from the audience was "Hasn't Google solved all these problems?" Meanwhile, during the session, I got a quasi-spam cell-phone call trying to recruit me for a medical study, and since my (Google Fi) phone was turned off, it went to voicemail, and Google helpfully offered me a text as well as audio version of the call.

The result illustrates one of the key ways that modern technology, including Google's, fails to solve all the problems of natural language understanding.

The First Workshop on Natural Legal Language Processing (NLLP) will be co-located with NAACL 2019. The phrase "natural legal language processing" in the title strikes me as oddly constructed, from a syntactic and semantic point of view, though I'm sure that NAACL attendees will interpret it easily as intended.

Let me explain.