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RA_Fisher

891 karma · joined September 14, 2012

I’m a statistician-economist and I was Zapier’s first data scientist & 9th employee.
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RA_Fisher··on Amdahl's Law
Cool for the perspective, but also subsumed by the concept of returns to scale (that entails diminishing returns and includes constant and increasing returns to scale). ie- rediscovery of microeconomics
RA_Fisher··on Understanding the BM25 full text search algorithm
Sure, this chat describes what I have in mind, https://chatgpt.com/share/673e9290-a044-8005-995b-166efe653e...
RA_Fisher··on Understanding the BM25 full text search algorithm
For sure. There are ML folks with statistical learning backgrounds, but it tends to be relatively rare. Physics and CS are more common. They tend to view things like you mention, more procedural eg- learning to rank, minimizing distances, less statistical modeling. Humility around statistics is good, but statistical knowledge is still what's required to really level up these systems (I've built them as well).
RA_Fisher··on Understanding the BM25 full text search algorithm
Hi David. Nice to meet you. Yes, precision and recall are always in tension. However, both can be made simultaneously better with a more informed model. Using your example, this would be a model that encodes the concept of files in the context of a user demand surrounding AWS.
RA_Fisher··on Understanding the BM25 full text search algorithm
Best is to use one statistical model and encode the underlying aspects of the context that relate to goal outcomes.
RA_Fisher··on Understanding the BM25 full text search algorithm
Statisticians are famously disliked, especially by engineers (there are open-minded folks, of course! maybe they’d taken some econometrics or statistics, are exceptionally humble, etc). There are some interesting motives and incentives around that. Sometimes I think in part it’s because many people would prefer their existing beliefs be upheld as opposed to challenged, even if they’re not well-supported (and likely to lead to bad decisions and outcomes). Sticking with outdated technology is one example.
RA_Fisher··on Understanding the BM25 full text search algorithm
I don’t think it’s realistic to think that software engineers can pick up advanced statistical modeling on the job, unless they’re pairing with statisticians. There’s just too much background involved.
RA_Fisher··on Understanding the BM25 full text search algorithm
For sure, it’s very popular, just not the best anymore (and actually far from it).
RA_Fisher··on Understanding the BM25 full text search algorithm
I’m sure Search experts would disagree, because it’d be their technology they’d be admitting is inferior to another. BM25 is the workhorse, no doubt— but it’s also not the best anymore. Vectors are a step toward learning models, but only a small mid-range step vs. an explicit model.

Search is a useful approach for computing learning models, but there’s a difference between the computational means and the model. For example, MIPS is a very useful search algo for computing learning models (but first the learning model has to be formulated).

RA_Fisher··on Understanding the BM25 full text search algorithm
BM25 can be used as a starting point for a statistical learning model and more readily built on. A key advantage is that one gains a systematic way to reduce edge cases, instead of handling a couple, bc they’re so large as to be noticeable.
RA_Fisher··on Understanding the BM25 full text search algorithm
Google’s come a long way since PageRank + terms. Ancient doesn’t mean bad, but usually it means outdated and that’s the case here. Search algos are subsumed by learning models, our species can do better now.
RA_Fisher··on Understanding the BM25 full text search algorithm
BM25 is an ancient algo developed in the 1970s. It’s basically a crappy statistical model and statisticians can do far better today. Search is strictly dominated by learning (that yes, can use search as an input). Not many folks realize that yet, and / or are incentivized to keep the old tech going as long as possible, but market pressures will change that.
RA_Fisher··on Terence Tao: "It can become more rational to think and act more boldly"
Well obviously Terence isn’t an economist. People don’t minimize risk, we maximize utility.
RA_Fisher··on Sam Altman tells staff there’s no plan for him to receive ‘giant equity stake’
It’s cronyism.
RA_Fisher··on React for R
Single functions and libraries can easily be imported in R, just like Python. It’s not necessary though, because the R community does a good job avoiding name conflicts (MASS aside).

I think the core issue is that the coordination benefits of having everyone use Python are overestimated, and the benefit of better statistical tools in R and SWE skilling up in statistics is underestimated.

RA_Fisher··on React for R
Cursed in your view because it’s not Python?
RA_Fisher··on AI Search: The Bitter-Er Lesson
Learning tech improves on search tech (and makes it obsolete), because search is about distance minimization not integration of information.
RA_Fisher··on Should Apple Kill Siri and Start Over?
I’d vote for Sirious.
RA_Fisher··on Logistic Regression for Image Classification Using OpenCV
Indeed, it's exploitation.
RA_Fisher··on US spent more on health care in 2022 than 6 countries combined with universal
Americans are relatively wealthy and hence choose to spend more on healthcare. That’s not surprising to me.
RA_Fisher··on Life course patterns of prescription drug use in the United States
Of course they will, medical technology improves over time.
RA_Fisher··on Statistical significance on a shoestring budget
It may be that after analyzing the data, we still have substantial uncertainty, just depends on the process’s inherent variability and what the data provides in terms of information (a function of the skill of the person determining what should be collected).
RA_Fisher··on I moved states just before the return-to-office order at Amazon, so I quit
Exactly. Continuing with the lease would be a classic case of sunk cost fallacy.
RA_Fisher··on Statistical significance on a shoestring budget
Sites are always getting new visitors, losing old ones and the ones they’ve observed return irregularly (or commonly, or somewhere in between). So it’s not realistic to assume a given sample of visitors is the population.
RA_Fisher··on Kris Nóva has died
So sorry to read this. I'm thankful for the positive example she set for all of us. Gone but not forgotten.
RA_Fisher··on Ask HN: How are you improving your use of LLMs in production?
I think you're in good company there. Kudos on seizing the opportunity. I built a tool that can help with this. It's free to try and I'd love to learn of any feedback you have: https://modelgymai.com/
RA_Fisher··on Ask HN: How are you improving your use of LLMs in production?
Exactly! With even just 3 chained calls, 98% individual chance of failure ^ 3 calls ~ 94.1% joint probability of success or 5.9% failure global rate. That's a failure rate of 1 out of 17.

Problems like those and my experience as a reliability statistician are why I built ModelGym: https://modelgymai.com/

I want to help LLM app developers deliver on their visions and accelerate the realization of AI's potential.

It's free to try. If you have any feedback, I'd love to learn of it.

RA_Fisher··on Ask HN: How to price your first enterprise customer?
A multi-year contract could mitigate that risk.
RA_Fisher··on Experiencing decreased performance with ChatGPT-4
I’m curious, how do y’all keep track of performance and reliability?

I ask, because I think it’s going to be a big challenge, so I built a service to record feedback / acceptance data: https://modelgymai.com/

If you think it can help, I’d love if you’d try it out and let me know if it helps.

RA_Fisher··on De-dollarization: Not a matter of if, but when
Who has higher inflation?
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