Recent comments in /f/explainlikeimfive

citizenkane86 t1_j1jqe7m wrote

I’ve you’ve ever seen the cyber truck vs f150 tug of war videos this is the reason why the cyber truck will always win regardless of the power. When the driver of the cyber truck floors it the truck moves instantly, bulling the f150 backward, while the f150 will take a pause before it applies any force, and once it’s moving backwards it’s already lost. It’s more of a physics trick than a display of power.

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Flair_Helper t1_j1jj4sm wrote

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its-octopeople t1_j1ja27h wrote

I've been keeping an eye out for bot accounts using ChatGPT here on Reddit. I caught one the other day confidently claiming there were 'aluminum lounge bars' where you could be served a range of aluminum based drinks.

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Purplekeyboard t1_j1j5pdk wrote

ChatGPT is essentially just a text predictor.

It is trained on basically all the text on the internet, and it uses this to learn what words tend to follow what other words. It's very powerful and sophisticated, to the point where it can write proper english sentences which are on topic and which are (mostly) accurate.

So if you say, "Where was Elvis Presley born?", it predicts that after this text would generally come text which gives the answer to the question, and that's the text it gives you. And because it has been trained on the text of the entire internet, it knows the answer to this question.

If you say, "Please write me a brief essay on the difference between capitalism and socialism", it predicts how such an essay would likely start, then writes that text. Then predicts how such an essay would likely continue, then writes that text. And so on, until the essay is completed. As it's been trained on the text of the internet, it has large volumes of text in its training material about capitalism and socialism and the differences between them.

ChatGPT is specifically trained to be a chat bot, and it probably has multiple censorship routines and "be a nice chatbot" routines which identify when your prompt or its own writing is something against its rules.

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phiwong t1_j1j4kes wrote

" What is it that lets them put their faith in the model given that the model is something purely mathematical and not instinctual? "

The counter question should be asked. Your question implies that instinct is a better way to develop trust in knowledge rather than logic and mathematics? Why do you believe so? Can you appraise your own "knowledge base" and determine how much of what you believe you know, you developed through actual observation and consideration? How much of what you think you know is "borrowed" from someone else's experience and knowledge? Why do you trust your knowledge in this circumstance? How do you make this evaluation?

One example, most people "know" that 1+1 = 2. I am confident that most people don't know how to prove this. Yet they believe this to be true? Why? It cannot be instinct, surely?

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drafterman t1_j1j0wx2 wrote

There is no confidence that ChatGPT will provide accurate answers. That isn't even the goal of ChatGPT.

ChatGPT is essentially a language prediction model. You provide a prompt. Then, using all of its immense database of collected text, plus its machine learning algorithms, generates what it things should come after that prompt. But it has no conception of what is factually true, it only has strings of information.

For example, if you prompt it with "What is 2 + 2?" It will probably say 4. Not because it us doing a mathematical calculation, or understands what math is, or because it knows 4 is right, but because in all of its training data the text "2 + 2" is overwhelming followed by the text "4".

In fact, more sophisticated models can actually be more prone to giving less correct answers in some situations as illustrated here:

https://www.youtube.com/watch?v=w65p_IIp6JY

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theBarneyBus t1_j1j0r2p wrote

The programmers don’t program question-answer pairs. Rather, they program a tool that “reads” millions of online articles, then tries to replicate responses that sound how the tool thinks an response about X would sound.
This often means that it gets things (surprisingly) correct, but can also lead to it sounding extremely confident, while having funky and/or misleading information.

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series_hybrid t1_j1iyyl1 wrote

Electric motors can make their max torque from the first RPM, and a gasoline motor needs to get up to its peak RPM's to make it's peak power. This is why an electric motor can be a one-speed, and gasoline engines need several gears to go through to stay near a higher RPM through most of the acceleration in order to accelerate reasonably fast.

Drag racing gasoline cars rev the motor up very high and then "dump" the clutch which makes the rear tires spin. If you do this is everyday life, the clutch will not last long.

With an electric, you can dump the full power into the motor for a few seconds without it overheating, or wearing out, so...they are built to be able to do that because it is one of the benefits of electric, so they want to emphasize it.

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RedditSchnitzel t1_j1iy7z6 wrote

Internal combustion engines basically have a very limited range of RPM where they can work. Too slow and they are going to stall and too high and the engine can't handle it.

That is why you have gears in your vehicle to allow your vehicle to drive different speeds but still having a small band of RPM for the engine.

With that understood, we can get to the main issue. An internal combustion engine doesn't produce a constant torque. You can understand the torque as basically the force with that the wheels try to move the car for this instance. Instead, the engine produces more torque the faster the engine is. That is why race car drivers try to shift right at the end of the gear and keep the engine hat high RPM.

Now, you don't want to do this with your own car, because is stresses the engine and has horrible fuel economy. The faster the engine spins, the more losses the motor has and the fuel economy gets worse.

That is where electric engines come into play. Modern electric car engines have the ability to produce a near constant torque with no connection to the RPM of the engine. So rather than having to spin up the engine first before you have the maximum force available, you have the force available even for small speeds then LOW RPMs.

This is why electric car engines can accelerate so high at small speeds compared to combustion engines.

​

Now, as a little caveat, this is not universal for all electric motors. Modern car engines use electronically controlled engines to have this effect. Especially for older train engines with limited electronical controls there are some variations and those characteristics might not hold.

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Flair_Helper t1_j1iucxp wrote

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