joshvm

84 ms·

871.
by joshvm 8y ago
Becuase the blocking happens at the router (ish) level, it should also prevent adverts inside applications where you can't run a blocker, eg mobile apps. That doesn't solve the problem when you're out of the house although yo
872.
by joshvm 8y ago
One counter argument is that they probably applied a basic linear least squares fit to the data. Simple linear regression, using the L2 loss i.e. (y-f(x))^2, is extremely sensitive to large outliers (like Birmingham and Manchester). Without
873.
by joshvm 8y ago
I recommend listening to Clive James' wonderful Point of View segment from Radio 4 (2009): https://soundcloud.com/pointofview-clivejames/london-undergr... It's only about 10 minutes. Very tongue in cheek, but
874.
by joshvm 8y ago
See Faster-RCNN, R-FCN, SSD, etc I've ignored mask RCNN becuase it's significantly more time consuming to label your data. The main candidates are all found in Facebook’s Detectron package, but they didn't feel it necessary t
875.
by joshvm 8y ago
There is a pytorch port from Ultralytics ( https://github.com/ultralytics/yolov3 ). Nobody seems to have figured out how to achieve the training performance of darknet though, which is entirely uncommented C. The source
876.
by joshvm 8y ago
Yolov3 is about a year old and is still state of the art for all meaningful purposes. It's fast and works well. You might get "better" results with a Faster RCNN variant, but it's slow and the difference will likely be i
877.
by joshvm 8y ago
Yes, ultraviolet is technically outside the visible range (ultra meaning too short a wavelength). In the same way that infrared wavelengths are too long for us to see. In optics, basically anything beyond blue is referred to as UV until you
878.
by joshvm 8y ago
Either a UV laser/lamp, or you need a broadband light source, like sunlight, and a filter/monochromator of some kind (either using a prism or a diffraction grating, or a bandpass filter). You could find something that only reflect
879.
by joshvm 8y ago
If you get told no, it's very important to ask why . Because then you have something actionable to work for, and you can reference that conversation next time you ask. For example if they say you don't have enough responsibility,
880.
by joshvm 8y ago
It's referred to as plasma in the primary literature: https://arxiv.org/abs/astro-ph/0608407 Many people use hot/ionised gas and plasma interchangeably though. For example: https://academic.ou
881.
by joshvm 8y ago
> because of dark matter's lack of electromagnetic interaction This is still an assumption, because we don't know for sure that dark matter is only weakly interacting, but this is what was observed in the Bullet Cluster collisi
882.
by joshvm 8y ago
Not for AR perhaps, but on a phone is doable. See for example (not Night Sight though): https://ai.googleblog.com/2017/04/experimental-nighttime-pho...
883.
by joshvm 8y ago
The SR-71 carried a clock accurate to a hundredth of a second [1]. It used that, combined with current observed locations of the brightest stars in the field of view to determine location (with reference to a catalogue). More info here: ht
884.
by joshvm 8y ago
You could probably do it with a Pixel (or something else with night sight) and astrometry.net.
885.
by joshvm 8y ago
A good CO2 sensor that uses infrared absorption to measure concentration costs about $100. https://www.co2meter.com/collections/co2-sensors
886.
by joshvm 8y ago
One downside of Ansible on the Pi is that a lot of stuff involves building from scratch, because aren't armhf packages available, or what's available in apt is hopelessly outdated. I have a stack at work that takes a day to build
887.
by joshvm 8y ago
What do you want to measure? Saying you need it to be super accurate doesn't mean much on its own. Air quality is subjective in any case. The BME680 (like other chips) measures VOC content - organic stuff like alcohol. You can also mea
888.
by joshvm 8y ago
Lots of public APIs support this behaviour, it's convenient for users. For example numpy.fromfile will accept a file object or a string.
889.
by joshvm 8y ago
> assert(isinstance(arg, type)) The most irritating thing I've found is trying to write a function that accepts either a path or the raw contents of a file. Python 3 makes this easy, you can check against string. Python 2 of course
890.
by joshvm 8y ago
The lasers in these things are often not class 1, but the whole system is. Perhaps it's fairer to say that laser classification is not just about the power of the laser, it's about how it's used and under what conditions. C
891.
by joshvm 8y ago
Eagle is in a weird place right now. For years it was functionally quite good, but horribly outdated UI-wise. I learned PCB design using Eagle, and will still go to Eagle first because I know I can knock out a breakout board in half an hour
892.
by joshvm 8y ago
You can see the cabling in the video on the official site: https://www.sprayprinter.com/
893.
by joshvm 8y ago
There was a control cheese, at least.
894.
by joshvm 8y ago
The questions ask for all permutations of length 3. What you've described is the Cartesian product: import itertools print(len([x for x in itertools.product(range(10), repeat=3)])) #1000 print(len([x for x in itertools.p
895.
by joshvm 8y ago
Weird. I opened it in reader mode. Doesn't seem to be on the normal page. It's a screenshot, maybe a draft? https://www.nvidia.com/content/dam/en-zz/Solutions/pattern-l...
896.
by joshvm 8y ago
The development kit specifically lists NVMe as an option https://www.nvidia.com/en-gb/autonomous-machines/embedded-sy...
897.
by joshvm 8y ago
The nano has a single USB3 PHY and 3x USB 2. The dev board may have a hub though. https://www.nvidia.com/en-gb/autonomous-machines/embedded-sy...
898.
by joshvm 8y ago
Depends what you want. The cheapest decent machine vision cameras that I know of are Basler's dart range, but they're still $100-300. Entry level is the DA2500-14uc (5MP 14fps). You can also try places like Leopard Imaging or eCon
899.
by joshvm 8y ago
I wouldn't disagree with that. And a big problem is that innocent people tend to produce stress reactions when interrogated, leading to false positives. It would be appropriate to call a polygraph a "fear" detector, since tha
900.
by joshvm 8y ago
I'm curious. Do OpenTable-enabled places get significantly more diners because they're able to compare multiple places for a single time slot? Or is the value simply that it makes booking easy for consumers? If it's the lat

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