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Cake day: June 16th, 2023

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  • SLS is on track to be more expensive when adjusted for inflation per moon mission than the Apollo program. It is wildly too expensive, and should be cancelled.

    This coupled with the fact that the rocket is incapable of sending a manned capsule to low earth orbit which is the the lunar gateway is planned to a Rectilinear Halo Orbit instead.

    Those working in the space industry know that SpaceX’s success is not because of Elon but instead Gwynne Shotwell. She is the President and CEO of SpaceX and responsible for all things SpaceX. The best outcome after the election is to remove Elon from the board and revoke his ownership of what is effectively a defense company for political interference in this election. Employees at SpaceX would be happy, the government would be happy, and the American people would be happy.


  • The technical definition of AI in academic settings is any system that can perform a task with relatively decent performance and do so on its own.

    The field of AI is absolutely massive and includes super basic algorithms like Dijsktra’s Algorithm for finding the shortest path in a graph or network, even though a 100% optimal solution is NP-Complete, and does not yet have a solution that is solveable in polynomial time. Instead, AI algorithms use programmed heuristics to approximate optimal solutions, but it’s entirely possible that the path generated is in fact not optimal, which is why your GPS doesn’t always give you the guaranteed shortest path.

    To help distinguish fields of research, we use extra qualifiers to narrow focus such as “classical AI” and “symbolic AI”. Even “Machine Learning” is too ambiguous, as it was originally a statistical process to finds trends in data or “statistical AI”. Ever used excel to find a line of best fit for a graph? That’s “machine learning”.

    Albeit, “statistical AI” does accurately encompass all the AI systems people commonly think about like “neural AI” and “generative AI”. But without getting into more specific qualifiers, “Deep Learning” and “Transformers” are probably the best way to narrow down what most people think of when they here AI today.


  • This is truly a terrible accident. Given the flight tracking data and the cold, winter weather at the time, structural icing is likely to have caused the crash.

    Ice will increase an aircraft’s stall speed, and especially when an aircraft is flown with autopilot on in icing conditions, the autopilot pitch trim can end up being set to the limits of the aircraft without the pilots ever knowing.

    Eventually the icing situation becomes so severe that the stall speed of the ice-laden wing and elevator exceeds the current cruising speed and results in a aerodynamic stall, which if not immediately corrected with the right control inputs will develop into a spin.

    The spin shown in several videos is a terrifying flat spin. Flat spins develop from normal spins after just a few rotations. It’s very sad and unfortunate that we can hear that both engines are giving power while the plane is in a flat spin towards the ground. The first thing to do when a spin is encountered is to eliminate all sources of power as this will aggravate a spin into a flat spin.

    Once a flat spin is encountered, recovery from that condition is not guaranteed, especially in multi-engine aircraft where the outboard engines create a lot of rotational inertia.





  • I am an LLM researcher at MIT, and hopefully this will help.

    As others have answered, LLMs have only learned the ability to autocomplete given some input, known as the prompt. Functionally, the model is strictly predicting the probability of the next word+, called tokens, with some randomness injected so the output isn’t exactly the same for any given prompt.

    The probability of the next word comes from what was in the model’s training data, in combination with a very complex mathematical method to compute the impact of all previous words with every other previous word and with the new predicted word, called self-attention, but you can think of this like a computed relatedness factor.

    This relatedness factor is very computationally expensive and grows exponentially, so models are limited by how many previous words can be used to compute relatedness. This limitation is called the Context Window. The recent breakthroughs in LLMs come from the use of very large context windows to learn the relationships of as many words as possible.

    This process of predicting the next word is repeated iteratively until a special stop token is generated, which tells the model go stop generating more words. So literally, the models builds entire responses one word at a time from left to right.

    Because all future words are predicated on the previously stated words in either the prompt or subsequent generated words, it becomes impossible to apply even the most basic logical concepts, unless all the components required are present in the prompt or have somehow serendipitously been stated by the model in its generated response.

    This is also why LLMs tend to work better when you ask them to work out all the steps of a problem instead of jumping to a conclusion, and why the best models tend to rely on extremely verbose answers to give you the simple piece of information you were looking for.

    From this fundamental understanding, hopefully you can now reason the LLM limitations in factual understanding as well. For instance, if a given fact was never mentioned in the training data, or an answer simply doesn’t exist, the model will make it up, inferring the next most likely word to create a plausible sounding statement. Essentially, the model has been faking language understanding so much, that even when the model has no factual basis for an answer, it can easily trick a unwitting human into believing the answer to be correct.

    —-

    +more specifically these words are tokens which usually contain some smaller part of a word. For instance, understand and able would be represented as two tokens that when put together would become the word understandable.



  • I’m convinced that we should use the same requirements to fly an airplane as driving a car.

    As a pilot, there are several items I need to log on regular intervals to remain proficient so that I can continue to fly with passengersor fly under certain conditions. The biggest one being the need for a Flight Review every two years.

    If we did the bare minimum and implemented a Driving Review every two years, our roads would be a lot safer, and a lot less people would die. If people cared as much about driving deaths as they did flying deaths, the world would be a much better place.




  • I hate that I am defending Israel when I say this because what is occurring in Gaza is tragic, but a lot of people are confusing “Genocide” for perceived “War Crimes” as defined by international law and also confusing “Hamas” for “Palestine” or the “Palestinian Authority”.

    Hamas is terrorist government (similar in nature to the Taliban) that receives a lot of external funding from countries that actively wish to see the death of Israel and all Jews, making Hamas the chief perpetrators of Genocide in this conflict despite how ineffective they have been in their goals.

    Israel was attacked by this terrorist government, and is now defending itself with the expressed war goal of destroying Hamas. While Israel has had a tenuous relationship with the Palestinian people (namely the government’s active efforts to limit the Palestinian Authority and drag their feet on grant the PA more autonomy and their own state which is deplorable and inexcusable), they do not and have not wished to kill an entire culture of people.

    Complicating matters, Hamas commonly employs warfare techniques that go against the Geneva Convention like placing government and military headquarters in basements of protected buildings like Hospitals and places of worship. The moment they do that, and abuse those international recognized sanctuaries, they become legitimate military targets leading to the tragic deaths of unwitting civilians.

    People can object to the war on the grounds that war is tragic and results in many civilian casualties, but to make meritless claims is detrimental to both international institutions and to the definition of a Genocide. South Africa calls what Israel is doing a genocide, but also explicitly looks the other way with Ukraine and continues to forge close ties with Putin? (For the record, Russia’s actions in Ukraine are also not considered genocide under it’s strict international definition, but they have been found guilty of war crimes).

    Israel has an internationally recognized right to defend itself, and it is doing that by dismantling Hamas through force. The Palestinian people are unfortunately caught in the crossfire. With that said, Israel’s methods to this end are not above criticism, and they have faced pressure from the US and Biden to limit civilian casualties wherever possible, and use ground forces to directly attack Hamas rather than relying on airstrikes that have resulted in many innocent deaths.

    For those reading who think all war is bad, I’ll leave you with this quote from John Stuart Mills:

    War is an ugly thing, but not the ugliest of things: the decayed and degraded state of moral and patriotic feeling which thinks that nothing is worth a war, is much worse. When a people are used as mere human instruments for firing cannon or thrusting bayonets, in the service and for the selfish purposes of a master, such war degrades a people. A war to protect other human beings against tyrannical injustice; a war to give victory to their own ideas of right and good, and which is their own war, carried on for an honest purpose by their free choice, — is often the means of their regeneration. A man who has nothing which he is willing to fight for, nothing which he cares more about than he does about his personal safety, is a miserable creature who has no chance of being free, unless made and kept so by the exertions of better men than himself. As long as justice and injustice have not terminated their ever-renewing fight for ascendancy in the affairs of mankind, human beings must be willing, when need is, to do battle for the one against the other.


  • You are absolutely right on all accounts. I’m sorry you’ve had shitty landlords, I wish there was a better way to weed those people out, because as it stands, the balance of power is heavily in the favor of the landlord due to the micro-monopolistic nature of renting a place for years at a time.

    Renting vs Buying is very dependent on your local market. I have friends in Ottawa that I’ve run the numbers for and it would literally never be profitable to purchase a home compared to continuing to rent. Some areas two years is the break even point. These days with high interest rates, the break even on buying vs renting is after about 5 or 6 years. I encourage anyone to check it out for themselves! :)

    https://www.nytimes.com/interactive/2014/upshot/buy-rent-calculator.html

    (For anyone stuck behind the paywall, install this chrome extension to get past it: https://github.com/iamadamdev/bypass-paywalls-chrome)

    I could’ve have been clear, but my situation has a very slight net benefit for me, and since my tenants only plan to live in the are for two years, they are getting the better end of the deal. In the end though, there is a mutual benefit and that’s what a competitive market should tend towards (as opposed to the monopolistic nature of corporate apartment housing which encourages the opposite).

    My point is that the people who hate all landlords instead of just the bad ones don’t understand the economic realities of housing. It’s actually the mom and pops that rent out their homes for a short period that make renting cheaper on average for the market as a whole. Mostly because they are imperfect businessmen/women and don’t understand the full cost of being a landlord before it’s too late. Instead, most mom and pop landlords are just hoping to break even.


  • CodeInvasion@sh.itjust.workstomemes@lemmy.worldThe system is broken
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    10 months ago

    Oh yes, it costs me $7k a year for the pleasure of managing a property, responding to all the tenants needs, the risk of paying for major future repairs, trusting the tenant to pay on time and in full (collections is practically impossible to enforce), dealing with vacancies while I still pay the mortgage, paying real estate agent fees which amounts to a month’s rent every time I get a new tenant. And that’s all for a house that I am not able to live in, and that I have locked up 20% of the house’s value for a down payment. It’s much more profitable just to let that money sit in the stock market instead.

    But please tell me more about how you know better and that’s it’s all sunshine and rainbows for a non-corporate landlord.


  • CodeInvasion@sh.itjust.workstomemes@lemmy.worldThe system is broken
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    10 months ago

    That was very nice your landlord!

    I agree, there are people who try to exploit the system, and those people deserve 100% of the hate. And I appreciate the nuance you bring to the discussion.

    There are those that will villify small-time landlords for the gall to try to make an extra cent. Ultimately, small-time landlords provide a very valuable service, with extremely tight margins. Frankly, it is just barely worth it for us to keep that home. Because additional risks that go into it includes a tenant trashing the place, skipping out on rent, the property being vacant between renters, rental listing fees (which amounts to a month’s rent typically), and so on.

    In return a tenant is able to enjoy a home that would otherwise be unaffordable to them, zero risk, and the flexibility to move without being stuck in one location. If someone is only going to live somewhere for less than 3 years, it will always be better to rent than to buy, and take the money saved renting and invest that into the market. The renter is this case will always make more money in return. Some markets around the country would require someone to live in that home for over 10 years before they break even over the advantage of renting.


  • CodeInvasion@sh.itjust.workstomemes@lemmy.worldThe system is broken
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    10 months ago

    Everyone here loves to complain about landlords without realizing that the majority of single family home landlords (not corporate landlords) are barely making it by too.

    Banks are really the ones making criminal amounts of money. 1/3 of rent is typically interest payments. 1/3 of rent then goes to taxes.

    For instance, I make $2,900/mo. from rent, but pay $2,800/mo. for the mortgage. I’ve spent over $8k this year alone on repairs and maintenance. But please continue to complain how landlords are constantly raking in cash. It’s typical for a homeowner to pay 1% of the cost of the property per year to maintain it. I will never see a positive cash flow until the mortgage is paid off in 25 years. The only benefit I get by continuing to own the property is the appreciation in equity and principle payments to the mortgage. At the end of the year we will have a -$7k cash flow and $5k equity appreciation. In a HCOL area, that $5k on paper is less than 3% of the area’s median yearly salary.

    I feel for anyone out there who has a landlord that didn’t consider the hidden costs and the fact they should expect to runa negative cash flow, because it’s those landlords that also can’t afford to fix the house you might be renting.