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  • After a harrowing chase, Ethic, Hedge, and their new ally Lemma

  • find themselves in a cavernous control room.

  • Here the last artifactthe Node of Memory

  • is suspended within a force field and powering a supercomputer.

  • Ethic is about to deactivate the force field when Lemma stops her.

  • She explains, a decade ago, she was assigned a research task:

  • to use the world machine to create something that would make everyone happy.

  • After many failed attempts, Lemma discovered a compound that, when ingested,

  • made people motivated, happy, creative, lovingin short, their best selves.

  • It was rushed into production.

  • Soon, the entire nation's food supply came from Huxenborg,

  • with the compound mixed in.

  • The first year was paradise.

  • The second, not so much.

  • Side-effects began to emerge: memory-loss, listlessness, and self-absorption.

  • In the third year, the government dissolved,

  • leaving the robots running everything in a self-sustaining loop.

  • By this point things were too far gone for Lemma to reverse.

  • People had become dependent on the compound,

  • and the few who refused it formed a resistance to try to fix things.

  • It took 10 years for Lemma to find a cure.

  • This factory contains everything she'll need to make it,

  • but the second they take the Node of Memory,

  • the security system will alert the robots, and they'll have to run.

  • If, instead, they first reconfigure the factory to manufacture the cure,

  • the people can be saved.

  • Lemma has the whole factory redesign planned out.

  • The problem isit's a little hard to read.

  • Her schematic shows all the steps in the manufacturing process

  • needed to make the cure.

  • An arrow fromadd nitric acidtoshake vigorously

  • means that the acid addition has to happen before shaking.

  • If a single step is performed out of order,

  • the cure won't work, or worse.

  • There aren't any circular references, where step A requires step B

  • and step B eventually requires step A.

  • Here's where Ethic and Hedge come in.

  • Lemma needs Hedge to translate the tangled diagram

  • into a sequence of steps.

  • That'll be the order that things happen in the factory.

  • Once input into the central computer,

  • the factory will reassemble itself as instructed.

  • Hedge's ability to store information in a table will help here.

  • So how does Ethic program Hedge to turn out a correct sequence

  • that can reconfigure the factory?

  • Pause now to figure it out yourself.

  • Rules in 3

  • Rules in 2

  • Rules in 1

  • Hint in 3

  • Hint in 2

  • Hint in 1

  • It may help to first think about this problem as a human,

  • rather than a machine.

  • Given this diagram, it's clear to start with getting a bowl,

  • since no arrows point to it.

  • How might you mark up the diagram to figure out what to do next?

  • Pause now to figure it out yourself.

  • Solution in 3

  • Solution in 2

  • Solution in 1

  • Diagrams like the one Lemma has drawn are called directed acyclic graphs.

  • A graph is a representation of data that shows different elements

  • and how they're related to each other.

  • Directed means that direction mattersas indicated by the arrows.

  • Here A leads to B, but B doesn't lead to A.

  • And acyclic means that there aren't any loops.

  • Which is fortunate, because if there were, this problem wouldn't be solvable.

  • There's a simple way to navigate the graph as a human:

  • start with a step that doesn't have any arrows pointing to it.

  • Once you do that, cross out that step and all arrows leading from it.

  • Choose another step with no arrows pointing to it,

  • and repeat until you've hit every step.

  • There are two things here that are tricky to translate for a robot.

  • First, how do you keep track of the information?

  • And second, what do you do if there are multiple options at the same time?

  • For the first challenge,

  • a convenient way for machines to store information is in a table.

  • In this case, you can have Hedge list every step in the headers

  • of both the rows and columns.

  • Then he can go through the rows one at a time.

  • On the schematic, what points to mix?

  • Both shake and titrate.

  • So Hedge should make a mark in both of their columns.

  • He can do the same for every row, one at a time, to make a table like this.

  • Of course the full table will be much bigger.

  • Like a human, Hedge will also want to start

  • from one of the steps that has no arrows pointing to it

  • which is the same as having no marks in its row.

  • If there's more than one,

  • a convenient way to choose is to pick the one that's alphabetically earliest,

  • though other selection methods can work just as well.

  • Next, Hedge can add that step to his running-order list,

  • delete its entire column from the table

  • thus removing all the times it was a dependency––

  • and loop back to the start.

  • Because there are no circular references in the graph,

  • each time we get here there'll be at least one step with no remaining dependencies.

  • Hedge can add the alphabetically earliest to his running-order list,

  • remove it from the table, and loop back to the start again.

  • So now we have a working loop,

  • and it'll run through all the elements in our table until none are left.

  • Hedge drifts back and forth over the schematics,

  • and soon he starts spitting out instructions,

  • which Ethic uses to configure the assembly lines.

  • With the three working together,

  • they churn out thousands of doses of the cure in no time.

  • Ethic finally plucks the Node of Memory

  • from its holding field and trips the alarm.

  • Within seconds bots are everywhere.

  • As Ethic falls in shock, the Node restores not only her own memories,

  • but reveals the last, missing pieces of the puzzle.

  • Ethic built Hedge with a singular purpose:

  • to construct a maze that would protect the world machine

  • from a corrupt government.

  • But in her haste, she made a critical mistake.

  • She forgot to set the condition that would end the loop

  • which told Hedge how large the maze should be.

  • So Hedge built and built until he could build no longer.

  • And then he was conflicted.

  • He had to build a maze.

  • But he couldn't build further without hurting people

  • or flying over the Bradbarrier,

  • both forbidden by his programming.

  • So he wandered the land and searched for a solution,

  • until he happened upon the Node of Power, the Node of Creation,

  • and the Node of Memory.

  • He recognized their true, collective power

  • to grant self-awareness to those who lack it.

  • With all three he'd be able to change his programming

  • and fulfill his drive to transform the entire world into a giant maze.

  • It wouldn't be easy:

  • the Nodes had safeguards to prevent robots from taking and using them.

  • But if Hedge could find the right human

  • and manipulate her with the promise of a heroic quest

  • well that would be a different story.

  • A very different story.

After a harrowing chase, Ethic, Hedge, and their new ally Lemma

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工廠》|像編碼員一樣思考,第9集劇情介紹 (The Factory | Think Like A Coder, Ep 9)

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    林宜悉 發佈於 2021 年 01 月 14 日
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