Wake Word

Inside, in the kitchen, my brother was defending Ray Kurzweil.

“Kurzweil,” a theory student was saying, in the voice a man saves for the name of the dog that bit him. “It is the year 2012, and you are standing in a kitchen defending Ray Kurzweil.”

He was; and I watched him take half a second to enjoy the coordinates, the way he enjoyed all indefensible positions, which he collected as other men collect grievances. My brother had a gift for being the most certain person in any room, and he wore the certainty lightly, the way the rich wear money — not as a thing he had earned that evening but as a climate he had always lived in and assumed you did too.

“I am not defending the man,” Jonah said. “I am defending some arithmetic he happens to be standing next to.”

“He graded his own predictions. Gave himself eighty-six percent. My undergraduates would commit crimes for that rubric.”

“Then grade him against anyone else. Name me one other soul who wrote down dated, checkable predictions in 1999 and had the nerve to stand there while the dates came due, one after another, and be counted. Everyone else in this business files their prophecies as directions for future work.” He pushed his glasses up with a single knuckle, which across a kitchen was correctly read as a man settling in. “You needn’t love the prophet. You are allowed to simply read the instruments.”

The theory student was a third-year, something to do with lattices, and he had the particular weariness of a man every one of whose cousins had read The Singularity Is Near and wished to discuss the uploading of their consciousness with him over the holidays. I did not hold the sneer against him. The sneer was a genre and not a person; you could argue with a genre until the keg ran dry and part friends. “The instruments,” he said. “The instruments have told us we are ten years away since 1956. This is the department — this is the city — where Herbert Simon stood up and said a computer would be the chess champion of the world inside a decade. He said ten years. It took forty.”

“And here you are,” Jonah said, “standing in the city where it came true, offering it as evidence that nothing does.”

Somebody by the refrigerator laughed into a cup. The theory student did what theory students do when they are losing, which is to change the coordinates. “Fine. Chess fell. Chess is a closed board and perfect information. The brain has a hundred trillion synapses and no documentation. Paul Allen wrote the thing up — there is a complexity brake. Each layer down into the machinery costs more than the last one paid back. The curve carries you until, all at once, it doesn’t.”

I had been watching this from across the room, over the heads of a knot of first-years, with something less than a third of my attention and rather more than I would have admitted — running my brother the way a good engineer runs a load average, not staring at the needle, exactly, but never quite looking away from it either. We had a signal for these occasions, older than either of us could date. Two eyebrows; four legal states. Both down meant go on, you’re on firm ground. The left alone meant source? The right alone meant ease off. Both together, held, meant abort — you are about to say the thing about 2029.

I sent him source? and watched it arrive, be read, be acknowledged, and be set gently aside, all in the space of a breath, which was well within his normal operating parameters.

Because I want to be honest, here, at the warm beginning, before honesty gets expensive: I could not make him wrong. God knows I tried. I wanted the whole Kurzweil business to fail the clean way, the way a perpetual-motion machine fails, on principle, before you even open the casing — and every time I went at it in good faith the numbers came back not false but merely unproven, which is a far more frightening word. The cat had unsettled me worst of all. That June, some group at Google had wired sixteen thousand processors together, turned them loose on ten million still frames plucked from the endless reel of the internet, and told them nothing — not what to find, not that there was anything to be found — and somewhere in that vast dreaming lattice a single unit had taught itself to wake for the faces of cats. No one had defined a cat for it. No one had told it that a cat was. Cats were merely present in the data, because the data was us, pointing our cameras at the things we love; and the machine, sifting, had found the thing we loved and made a place for it. I read the paper twice looking for the trick. There was no trick. There was only more computer than anyone had ever aimed at a question that soft, and an answer that no one’s theory had thought to ask for. I wanted my brother to be right the way one wants good weather on a journey. Wanting has never yet moved a forecast, and I declined to begin rounding at that late date.

The theory student had noticed me by now, and performed the small private despair of a man who watches the same face arrive twice.

“There are two of you,” he said, rechecking a premise.

“He’s the control group,” said Jonah.

“You believe any of this?” the man asked me. “Your brother has machines passing the Turing test while the rest of us are still paying down our loans.”

“No,” I said. “And I would like it on the record that the date is a fantasy.” I took the beer Jonah was already holding out to me without either of us looking, which was a protocol of its own. “Now — tell me what the brake is.”

“What?”

“Allen’s complexity brake. You invoked it. A brake is a mechanism. So name me the mechanism. Tell me what, precisely, gets harder in a fashion that compounds faster than the tools improve — because he never names one. It is two pages of this feels difficult to me, and you are holding it up beside a system that taught itself the idea of a cat, in three days, from nothing, this past summer. One of those things is a measurement. That cannot be right is not a measurement.”

“The burden isn’t on—“

“The burden,” I said, “is on whoever is doing the rounding. He rounds up; I’ve said so, it’s on the record, and he at least does it in daylight where a man can check his work. You are rounding to zero, which is the worse sin, because you are doing it in the voice people save for the word obviously. My brother’s number is a fantasy. But he arrived at it by reading the instruments. There is a difference between a poor reading and no reading at all, and only one of you tonight has bothered to take one.”

The kitchen had gone quiet enough that the porch came through — the rover, it seemed, had turned up its ancient riverbed, and the porch had resolved that this called for a toast. The theory student looked from the one of our faces to the other, found no seam in us he could get a blade into, and went to fetch a beer he did not want. Jonah raised his cup a quarter of an inch — acknowledged — and my eyebrows came down at last, and that was the whole of the exchange between us, and it was enough. We would both have been embarrassed to need more bandwidth than that.

We left a little before one and went downhill into Squirrel Hill with the party thinning behind us, past the shuttered pizza windows and the last bus of the night sighing somewhere over on Murray. September had stayed warm the way it sometimes will in that city, the streets holding the summer’s charge a few weeks past the equinox and spending it down slowly, and we walked through the last of it. I walked as though the light were always about to change. Jonah kept pace without hurrying, which is a different thing entirely, and the difference between those two gaits is, I have come to think, the whole difference between us.

Alone, we talked the way we had always talked, which a stranger would have needed a diagram to follow — each sentence launched by the one of us and audited in flight by the other, abandoned mid-clause the instant its destination was obvious, resumed three exchanges later from the far end as if no time had passed. It was not the finishing of each other’s sentences, which is a trick for lovers and confidence men. It was nearer to having no further use for the sentences at all — both directions of the wire live at once, no one waiting for the channel to clear.

“You were out at 2029,” I said, “before I even reached you.”

“I said it was conservative.”

“You said it to a room.”

“That is where the people were.”

We went a block on that, comfortably, two sets of footsteps and a single argument that neither of us needed to finish aloud, because it would keep. It had been keeping since we were nine. It would grow, before the autumn was out, into the argument of the whole season — but that was three weeks and one benchmark away, and the night was warm, and I did not know yet that we were spending the last of something.

And my brother walked, and felt the year beneath him like a floor he trusted. This was the thing he had long since given up trying to explain at parties, the article of faith that made it possible for him to lose every argument in a room and then sleep like a man who has money down on a sure thing: that the flat stretch of the curve and the steep stretch are the same curve. There is no boundary between them, no sign posted at the border, no night when the world announces its own turning. Everyone lives on the flat part, he believed, right up until the hour when no one does. And if you truly held that — held it in the spine and not merely in the mouth — the strange gift the belief made you was not urgency at all, as people supposed. It was patience. The doubling forgives you the early years; the doubling is the early years. A man could stroll, unhurried, through the flat decade of the only interesting century there had ever been, provided only that he knew which decade he was standing in. And my brother was twenty-one years old, and he was certain that he knew.

“You walk like we’ve already won,” I said, holding the corner for a light I would have crossed against, alone.

“We have,” Jonah said. “It simply hasn’t propagated yet.”

Rosa — you will like Rosa; she calls you the professor, on account of the glasses folded on your tray, which are useless to you now and which I find, of all the objects in this account, the single one I cannot look at directly — Rosa told me that hearing is the last of the senses to leave a man and the first to come home to him. I asked her for a citation. She patted my arm, which I have come to understand is the citation. So: hearsay, unverified, most likely the folklore of a kind profession. But I did the arithmetic that night the way you would have wanted it done, coldly, on the merits. The cost of speaking to you is nothing. The payoff is positive for any chance above zero that you are in there, listening. You would have signed your name to that math. You would have called it the cheapest bet in the building, and taken it, and been right.

So I decided that I would talk.

Your heart, that night, was keeping seventy-two beats to the minute. I had checked; I check everything now. Seventy-two beats is a little over one each second — call it 1.2 of those cycles a second, 1.2 hertz — and it is the slowest and the most honest clock the two of us have ever run on. Once we measured our nearness in tenths of a millisecond, in the time a signal took to cross a gray cable our father strung between our rooms when we were nine. Now I measure it in this: the long, unhurried arithmetic of a body that has decided, for reasons it declines to share with me, to go on. It is the only clock left in the world that I trust, and I have set my whole life to it, and I did not ask its permission.

You chose the twenty-first, by the way. Of course you did. December 21st, 2012 — the whole internet had spent the month at its joke, the Mayan calendar, the last b’ak’tun, the end of the world; and then the twenty-first arrived, and the world did end, only not for the people who had been watching for it. It ended locally. One bridge, one seam of black ice, one car. Everyone else’s apocalypse was quietly cancelled at dawn. Ours had shipped on schedule.

There was ice on the bridge. That is nearly the whole of the incident report. You never saw it; no one would have. Input, fault, no handler written for it, and no way now to attach a debugger to any of it — and still I step through that night as though a replay might, this once, behave differently if I only run it patiently enough. I know that replays are deterministic. I know it the way I know few things. I run them anyway, all night, most nights, and they end the same way each time, and I begin again.

And here is the thing I am going to say once, aloud, in this room, and then not again, so if any part of you is listening, listen to this part:

You were on that road because of me.

I found the listing. A GTX 580, three gigabytes, scarcely used — some boy two towns over selling off his rig for tuition. And I said tonight. I said go tonight, cards like that are gone by morning. Because of a paper. You are lying in this bed because your brother read a paper and got greedy over a graphics card.

The card came through without a mark, if you want to know. Our father brought it in from the trunk of the wreck. Not a scratch on the shroud, not one bent pin, nothing — it is sitting in the garage in its anti-static bag, perfect, and I can neither look at it nor throw it away, and I have begun to suspect I will spend a very long portion of my life doing neither.

But I am going to tell you about the paper anyway, because it was the last thing we ever spoke of — really spoke of, both channels open, the way we did — and because I have come to believe it was the beginning of something, and when you wake you will want all of it from the first entry. So consider this the first entry. Log begins here.

Three weeks ago, out at Lake Tahoe — the winter meeting was there this year, casino carpets and canonical correlation, your favorite combination of the sacred and the absurd — Hinton’s people showed what they had done to ImageNet. You know the contest: a million photographs, a thousand categories, the benchmark that has been grinding the whole field of computer vision to a paste for three years running. The serious teams spend careers by hand, carving out the clever features one at a time — the gradient histograms, the descriptors, whole cathedrals of ingenious and painstaking engineering — and the best of them had been stalled around twenty-six percent error, prying loose half a point a year and calling it a career.

The entry from Krizhevsky’s group got fifteen. Fifteen point three.

They did not edge past the field. They broke the curve across their knee. Eleven points in a single entry, in a discipline that reckons its entire self-worth in tenths.

And here is the part that kept us up that last good night — the part you called first, and I want it on the record that you called it first — it was not a new idea at all. It was a neural network. The crazy-uncle technology. The very thing every respectable person in the field had spent two decades calling, politely, over the good wine at conference dinners, a dead end. Hinton had been out in that wilderness with it since before either of us was born. They had simply made the thing deep, and fed it everything there was, and trained it on two gaming cards — two GTX 580s, in somebody’s bedroom, five or six days of heat. Not a national laboratory. Not a supercomputer. Consumer hardware. Our hardware.

That is what the card on Craigslist was for. That is what go tonight was for. We were going to reproduce it over the winter break, you and I — two 580s and a space heater we would have had to unplug so the breaker would hold — and you said that scale might be the entire trick, and I said there was no possible way it was that stupid, and you said, and I am quoting you back to yourself now, which is what it has come to between us, you said: the bitter thing about the universe is that it rewards dumb things done at scale.

I still think you are wrong. I want it entered, here, in the log, that in December of 2012 I still think you are wrong. But I am writing it down all the same, because if the next ten years make a prophet of you, you are going to want the receipts, and the gloating will be good for your recovery.

Other business, while I have the floor. Two weeks ago the most literal-minded corporation on the face of the earth walked out and put Ray Kurzweil on its payroll — Director of Engineering, your Kurzweil, the one you would defend at parties while I stood a little behind you doing damage control with my eyebrows. The exponential prophet, drawing a salary, in the same December that a neural network broke ImageNet on two cards a student could have bought with a summer’s wages. Nobody out there is drawing the line between those two events yet. So I am drawing it in here, aloud, to a hospital room, at nine o’clock at night, because somebody ought to be keeping the record, and it appears to be me. First entry. Receipts.

The doctors gave us their numbers today. I am not going to repeat them to you. You know that I know what a base rate is; you have watched me lose money at cards, specifically, because I have never once in my life rounded a probability in the direction I wanted it to go. Tonight I am making the first exception of my life. I am throwing out the priors. Sample size of one — and the one is you, and you have never in all your days consented to fit anyone’s distribution, and I am not fool enough to start expecting it of you now.

So here is what I am proposing to you. Call it a covenant; you would call it a spec, and a spec is the only language of love that ever compiled cleanly for either of us, so have it your way.

I will come every day. In the evenings, after our mother’s watch at your side is done, because she needs the daylight more than I do, and because you and I always did our best work after dark. Each visit I will bring you three things, and hold nothing back — full disclosure, no compression: what has happened in the field, what has happened in the world, and what has happened to me, even the parts I would ordinarily refactor out and never mention, because you told me once I bury the true thing three function-calls deep, and you were right, and in this room I am going to stop. Your part of the contract is only to listen. We are half-duplex now, you and I — one direction at a time, and for a while the direction is mine. I have hated half-duplex my whole life. But the channel is open, and an open channel is not nothing. An open channel is, tonight, the entire world. And on the day you wake, you may interrupt me — you may interrupt me for the rest of our lives, and I will never once complain of it again. That clause is binding and I want a witness to it, so: Rosa, wherever you are down that hall, you are the witness.

When we were nine years old, and our father finally ran that gray crossover cable between our two machines because we had begged him for a solid week, the first thing you ever did with it — before any game, before anything — was ping me. You made the terminal font enormous so I could read it from across the room. Sixty-four bytes. Time equals zero point four milliseconds. And you said: now we always know the other one’s there. It became the whole of the ritual, do you remember — before school, and after the fights when neither of us would be the one to speak first but the packets did not count as speaking. The autumn I left for university and you had not yet gone, we did it every single night. Ping, and pong, proof of life down at the level of the protocol, where no conversation is required and none of the hard words have to be found.

Visiting hours are over now. Rosa is doing the thing with the curtain.

I will be back tomorrow. And the day after that, and the day after that one, for as long as this takes — and it may take as long as it likes, because I am not going anywhere, and neither, it turns out, are you. Too soon? You would have laughed. Eleven minutes I have been older than you, our whole lives, and I never once had any use for them until this week. I am using them now. Elder brother’s orders: stay on the network.

All right.

Ping.