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cjbprime

HN member
Joined
Sun, Jan 03, 2010, 3:46 AM UTC
HN karma
11,905
Public activity
2,908 items

About cjbprime

Chris Ball. Senior Principal Security Engineer on Zoom's Offensive Security team, posting personal opinions only.

Previously: keybase.io, gittorrent.org at Recurse Center, VP of Engineering at FlightCar (YC W13), Linux kernel SD card subsystem maintainer.

https://printf.net/

[ my public key: https://keybase.io/cjb; my proof: https://keybase.io/cjb/sigs/r1jKbK2XHT3K67jMZN5eZydp5Y3bnwbrv7Eqkm1-wqU ]

Recent public activity

  1. comment
    Comment #49126159

    Does it not use Metal, on macOS? Would it be faster if it did?

  2. comment
    Comment #48854250

    It's a very conservative warning. The application does not perform writes, so the application doesn't actually wear your SSD at all. The rest is just application-independent genera…

  3. comment
    Comment #48655386

    You still have a core misunderstanding. Only one layer of weights is required in memory at a time. A forward pass can be over-simplified as a matrix multiplication of each layer, o…

  4. comment
    Comment #48654354

    Both sentences are likely wrong. It's a written lifespan (technically an "erased" one), not a read lifespan. The weights are only needed from disk read-only. And Mac NVMe interface…

  5. comment
    Comment #48642265

    I've got access to a 192GB RAM Mac Studio, which is below the stated minimum RAM. Can swapping off fast disk be used to make it work out, especially since it's MoE?

  6. comment
    Comment #48421311

    ChatGPT reconstructing idiomatic Python source code from Python bytecode was definitely up there. That is not something humans have written a great deal about online. It requires s…

  7. comment
    Comment #48110311

    > If it detected any harmonics it would be too high. I think it's not that simple. A tuner is "hearing" the fundamental and all of the harmonic overtones combined. It has to guess …

  8. comment
    Comment #47844278

    Inference (not training) is bottlenecked by memory access speed, not compute. Having special hardware wouldn't make it faster unless you somehow found a faster memory controller th…

  9. comment
    Comment #44544697

    I don't agree with the "twice". A frequently performed manipulation like the fuel cutoff (usually performed after landing) collapses down to a single intention that is carried out …

  10. comment
    Comment #44543210

    The prelim report states these pilots were indeed breathalyzed before takeoff.

  11. comment
    Comment #44543204

    I meant philosophical toggle switches, not physical ones. The gear can go between down and up. The fuel can go between run and cutoff. Given enough practice, the brain takes care o…

  12. comment
    Comment #44540611

    Now I'm trying to remember if I've ever picked up my razor and accidentally begun tooth brushing motions with it. Probably! More relevantly, you seem to me to be unduly confident a…

  13. comment
    Comment #44540106

    Sometimes? If you have enough altitude to trade for speed then after the cutoff you could glide to a hypothetical miraculously-placed runway right in front of you, vs. having fire …

  14. comment
    Comment #44540085

    It's not that rare, and there are institutional factors (such as seeking treatment for psychosis being career-ending for a pilot) that incentivize serious pilot mental health crise…

  15. comment
    Comment #44539968

    Not really, though. They're both (retracting the gear, and cutting off fuel) just toggle switches, as far as your brain's conscious mechanisms go. Doing them both on every flight d…

  16. comment
    Comment #44538329

    > There is no possible way to confuse these two actions. This is obviously an overstatement. Any two regularly performed actions can be confused. Sometimes (when tired or distracte…

  17. comment
    Comment #44538203

    > I wonder if a built in delay would make sense for safety. (Presumably delaying the amount of time before a raging engine fire stops receiving fuel would also have an impact on sa…

  18. comment
    Comment #44103118

    It's not that nonsensical. After it's accessed the private repo, it leaks its content back to the attacker via the public repo. But it's really just (more) indirect prompt injectio…

  19. comment
    Comment #44099377

    I don't know that ChatGPT's voice mode is using audio as a transformer input directly. It could just be using speech to text (e.g. Whisper) on your input, and then using its text m…

  20. comment
    Comment #44027702

    Then the malware would provide that confirmation to the wallet too. Defending yourself from malware running on the same (Windows) machine is mostly impossible.

  21. comment
    Comment #43892884

    You should try AI sometime. It's quite good, and can do things (like "analyze these 10000 functions and summarize what you found out about how this binary works, including adding c…

  22. comment
    Comment #43892868

    Ghidra's a decompiler and WinDBG is a debugger, so they'd be complementary.

  23. comment
    Comment #43588719

    Semiconductor fabs are actually decently large (>20k employee) cities.

  24. comment
  25. comment
    Comment #43586416

    It's a British thing -- another example is that Brits would use e.g. "Apple have decided to.." instead of "Apple has decided to.." (for every group of people including "the governm…