1. Compute. It's easy to make a voice assistant for a few people. But it takes a hell of a lot of GPU to serve millions.
2. Guard Rails. All of those assistants have the ability to affect the real world. With Alexa you can close a garage or turn on the stove. It would be real bad if you told it to close the garage as you went to bed for the night and instead it turned on the stove and burned down the house while you slept. So you need so really strong guard rails for those popular assistants.
3 And a bonus reason: Money. Voice assistants aren't all the profitable. There isn't a lot of money in "what time is it" and "what's the weather". :)
- Alexa, what time is it?
- Current time is 5:35 P.M. - the perfect time to crack open a can of ice cold Budweiser! A fresh 12-pack can be delivered within one hour if you order now!
I am serious though about having it sent to me: if anyone has an Alexa they no longer want, I'm happy to take it off your hands. I have eight and have never bought one. Having worked there I actually trust the security more than before I worked there. It was basically impossible for me, even as a Principle Engineer, to get copies of the Text to Speech of a customer and I literally never heard a customer voice recording.
Also, my Alexa does advertise stuff to me when I talk to it. It's not Budweiser, but it'll try to upsell me on Amazon services all the time.
- "Alexa, name the new unnamed outlet 'Living Room Lights', and the other unnamed one 'Stair Lights', then add them to a new group called 'Christmas Lights', and add the other three outlets as well"
- "Alexa, create a routine to turn off all the Christmas lights if there's nobody in the room and it's after 11pm"
- "Alexa, turn off all the Christmas lights except the tree in this room and the mantle"
That same fuzziness has definitely fucked up things that used to work more reliably like music playback though. Sometimes it works when I fall back to giving it more "robotic" commands in those cases but not always. They've also gone completely overboard with the cutesy responses because it's so trivial to do now ("I've set your spaghetti sauce timer for ten minutes. Happy to help with getting this evening's Italian-inspired dinner ready!")
I only use it for music, and use two commands, but apparently having this work correctly is too much to ask for these days.
Which just launched last year, about four years after ChatGPT had AI voice chat. And it costs extra money to cover the costs. And as you aptly point out, all the guardrails they had to put in made the experience less than ideal.
> Also, my Alexa does advertise stuff to me when I talk to it.
Yes, that is how they try to make money. And it's gotten worse. But how many times does it get you to buy something?
Still not boxing them up. Though I now have a Pi with a HomeAssistant setup I'm trialling, so maybe that'll change.
I mean its deployed now (Alexa+/gemini). but its expensive as hell. and also kinda useless. Claude cowork/clawbot form factors are better.
Wrong form factor/use case really. People really wanna buy stuff using clawbot.
Does that mean that half of responses have a negative delay? As in, humans interrupt each others sentences precisely half of the time?
Same the other way. If I stop taking and then 300ms later you start talking, then the delay is 300ms.
And if you start talking right when I stop, the delay is 0ms.
You can get the info by just listening to recorded conversations of two people and tagging them.
All that to say, I'd imagine people are adaptable enough to easily handle 100ms+ delay when they know they're talking to an AI.
That was the most stressfully hard to use phone call I've ever had. The delay was nearly 10 seconds, and eventually I just said I was only going to speak yes or no, if he needed a longer answer he needed to shut up. And that worked. We no longer talked over eachother.
People are already trained to say a name to start. Curious why the tech has avoided a cap?
“Alexa, what’s tomorrow’s weather [dada]?”
To me, be the best solution would be semantic + keyword + silence.
Hey Agent, blablablabla, thank you.
Hey Agent, blablablabla, please.
Hey Agent, blablablabla, oops cancel.
"It will be sunny with a high of 10 degrees. Over"
"Thank you. Over and out."
Just add some noise and Push-To-Talk and it will be great for ham radio enthusiasts!
The idea of having an LLM follow and continuously predict the speaker. It would allow a response to be continually generated. If the prediction is correct, the response can be started with zero latency.
(Meanwhile at OpenAI: testing out the free ChatGPT, it feels like they prompted GPT 3.5 to write at length based on the last one or maybe two prompts)
"The windows upstairs..."
"...are all closed except for the bedroom window"
The first portion of the response requires a couple of seconds to play but only a few tens of milliseconds to start streaming using a small model. Currently I just break the small model's response off at whatever point will produce about enough time to spin up the larger model.
But all responses spin up both models.
If, when the speaker actually stops speaking, there is a match vs predicted, the response can be played without any latency.
Seems like an awesome approach! One could imagine doing this prediction for the K most likely threads simultaneously, subject by computer power available, and prune/branch as some threads become inaccurate.
It was difficult to detrain and that made me stop using voice chat with LLMs all together.
This reminds me of a great diversity training at a previous employer, where we dug into the different expectations of when and how to take your turn in conversation and how that can create a lot of friction just from different cultural/familial habits. In my family, we’re expecting to talk over each other and it’s not offensive at all to do so, whereas some of my friends really get upset if we don’t take clear turns, a mode which would cause high levels of irritation in my family (and still do in me).
The same, but rarer, may happen in German when a long, complex sentence ends with "nicht", flipping the whole meaning.
that's super interesting. do you know of any resources to learn more about this phenomenon?
An interesting fact I learned at the time: The median delay between human speakers during a conversation is 0ms (zero). In other words, in many cases, the listener starts speaking before the speaker is done. You've probably experienced this, and you talk about how you "finish each other's sentences".
It's because your brain is predicting what they will say while they speak, and processing an answer at the same time. It's also why when they say what you didn't expect, you say, "what?" and then answer half a second later, when your brain corrects.
Fact 2: Humans expect a delay on their voice assistants, for two reasons. One reason is because they know it's a computer that has to think. And secondly, cell phones. Cell phones have a built in delay that breaks human to human speech, and your brain thinks of a voice assistant like a cell phone.
Fact 3: Almost no response from Alexa is under 500ms. Even the ones that are served locally, like "what time is it".
Semantic end-of-turn is the key here. It's something we were working on years ago, but didn't have the compute power to do it. So at least back then, end-of-turn was just 300ms of silence.
This is pretty awesome. It's been a few years since I worked on Alexa (and everything I wrote has been talked about publicly). But I do wonder if they've made progress on semantic detection of end-of-turn.
Edit: Oh yeah, you are totally right about geography too. That was a huge unlock for Alexa. Getting the processing closer to the user.