robbie-c

5 ms·

1.
by robbie-c 1mo ago
> it will not be worth what the loan assumed I'm begging people to take the time to write things themselves rather than getting Claude to write for them. If you want human effort from readers, please put in human effort while writin
2.
by robbie-c 2mo ago
While I'm here - I recently optimized our PR review skill to make better use of the KV cache. Previously, it loaded up the diff, persona and prompt, and wrote those into the first message for each of 6 sub-agent reviewers. The prompt w
3.
by robbie-c 2mo ago
I'm begging people to write articles themselves rather than letting Claude do it for them. I want an expert opinion, if I just wanted to ask an LLM I have my own. How can this article not mention the KV cache even once?
4.
by robbie-c 2mo ago
> There are people who do, - And there are those who criticize. There’s no need for that. I’ve done plenty.
5.
by robbie-c 2mo ago
Is it on topic to complain about the various claude-isms in this article? I don't know any actual humans that write titles like "Two floors the rate card hides". I find my brain disengages once I suspect something of being wr
6.
by robbie-c 2mo ago
They sort of are, in that they want subscription users to have clients that behave well with the KV cache etc. If you don't use a subscription, and pay per token instead, you can easily move to another harness.
7.
by robbie-c 2mo ago
A family member stayed in a hotel in Dubai recently and on returning said how incredible the staff were and willing they were to help them, and my response was "no shit"
8.
by robbie-c 2mo ago
Nothing has changed, just OP found the mirror of the main repo with the ee/ folder removed. That repo has been up for most of the lifetime of the company.
9.
by robbie-c 2mo ago
PostHog has always been open source. I'm not sure why this has been shared on HN at all.
10.
by robbie-c 3mo ago
That's valid criticism, I kinda hand-waved the "months" part. I read everything I could about parsers while building this (I have a CS background but hadn't thought about parsers in a long time) and came across this blog
11.
by robbie-c 3mo ago
The previous parser is mostly a declarative grammar file, which is extremely readable. It codegens a C++ parser, which is hard to read. It depends which of those you count as the previous parser's source code! In the future, we'd
12.
by robbie-c 3mo ago
Yeah, one of the interesting parts to me while working on this is that the breakpoint for when it's worth writing your own parser vs accepting ANTLR's slowness has shifted massively. Previously it would have been someone's fu
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by robbie-c 3mo ago
:D I was hoping to avoid the criticism that I was picking the most favourable number and being misleading!
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by robbie-c 3mo ago
In what way? This was a geometric mean of the improvements from a small test corpus. In production, where it only parses longer SQL that didn't hit the parser cache, the mean parse time went down by 454x, across millions of parses.
15.
by robbie-c 3mo ago
Ha I did consider that! But 70x is plenty fast enough (we still have to query an actual database!) and the parser runs in a shared process on untrusted input, so it wasn't worth the security risk
16.
by robbie-c 3mo ago
It took about 2 days to get a proof of concept, and about a week to get something I could ship to production. I skipped a few features for the PoC (like XML tag support, token positions), so most of the delta was adding those back in!
17.
by robbie-c 3mo ago
Our SQL is very similar to ClickHouse SQL, in that we used ClickHouse SQL as a starting point as that's what our underlying DB is. We needed to have our own parser so that we could add additional language features on top.
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I rewrote PostHog's SQL parser, 70x faster, while barely looking at the code(posthog.com)
155 points by robbie-c 3mo ago|72 comments
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Autoresearch found a 3-year-old bug in our query engine(posthog.com)
5 points by robbie-c 4mo ago|0 comments
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by robbie-c 4mo ago
We pay github quite a bit of money and it's down for us too
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by robbie-c 4mo ago
I did that first, which didn't work for a couple of reasons. Many "big and tall" stores are the intersection only, and many of the stores didn't quite have the right vibe. I do have some of my wardrobe from places like 2
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by robbie-c 4mo ago
Undecided. One of the sites didn't have an LT but the LLM flagged that chest dimensions on their large were narrower than others, so could be worth trying.
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by robbie-c 4mo ago
Huh, I shopped for clothes using AI today. Not super relevant to the Googlebook ad, but in case the perspective is interesting to you: I'm quite tall (194cm) but not very wide, so I usually struggle with buying clothes online. I used A
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by robbie-c 6mo ago
Wait - are you missing all the context on this? Anthropic pushed back against this hard, there was a whole back and forth. I'm on mobile and can't look it up for you atm but if you google about this scenario, Anthropic definitely
25.
by robbie-c 6mo ago
Quite a lot worse. Both OpenAI and xAI were among the largest donors of Trump's campaign Musk was the largest individual political donor of the 2024 election [1] and Greg Brockman was the largest donor to Trump's "MAGA Inc&qu
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by robbie-c 9mo ago
There's proof of financial dependence, here's a recent report https://assets.mozilla.net/annualreport/2021/mozilla-fdn-202... In 2021 they got $500M "royalties" (this is their payment from Goog
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by robbie-c 9mo ago
I think it's just an AI-generated simplification, sucks that it made it to the front page. The subject matter is interesting, I would have loved to have read something written by an expert!
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by robbie-c 10mo ago
I've wondered about this too. I live in the UK and have been idly daydreaming about my next startup, and it seems like Brexit, and therefore having a small market / uncooperative EU, is such a headwind for some of the things I&#x2
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by robbie-c 1y ago
> In contested elections both sides usually have a large amount of spending. I think you're thinking about this in the wrong way. What you're saying is that people who don't have a lot of money to spend usually don't
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by robbie-c 1y ago
Disclaimer: IANAL > If the same IP address is hashed using the same method, the result will always be the same, meaning it can be matched. The way people get around this is by using an ephemeral salt, that is deleted e.g. daily. After en

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