kandi X-RAY | akin Summary
kandi X-RAY | akin Summary
Recommendation Engine Library based on Collaborative Filtering. Node.js implementation using MongoDB via Mongoose. Provides hooks for logging user activity on items referenced by an ObjectID and an optional item type. Additional methods provide execution of a scalable, collaborative filtering algorithm that outputs recommendation results for each user into a namespaced Mongo collections. These results can then be retrieved and integrated into the application as desired.
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A while ago, I had seen a website whose title tag had an animated typewriter effect somewhat akin to the one embedded in the hyperlink but instead of being used in the body, it was used on the tab title. I can't remember the website and upon trying it in my case failed. How can it be achieved?
ANSWERAnswered 2021-Jun-12 at 18:03
You can use Promises and
document.title modification to achieve a typewriter effect on the title.
I'm using a task that creates other tasks. Those tasks in turn may or may not create subsequent tasks. I don't know beforehand how many tasks will be created in total. At some point, no more tasks will be created, and all the task will finish.
When the last task is done, I must do some extra stuff.
I've also tried using ExecutorService, but I've encountered some issues such as the inability to execute something at the end, and you can see my attempt below:...
ANSWERAnswered 2021-Jun-10 at 14:23
It seems pretty tricky. If there is even a single task that's either in the queue or currently executing, then since you can't say whether or not it will spawn another task, you have no way to know how long it may run for. It may be the start of a chain of tasks that takes another 2 hours.
I think all the information you'd need to achieve this is encapsulated by the executor implementations. You need to know what's running and what's in the queue.
I think you're unfortunately looking at having to write your own executor. It needn't be complicated and it doesn't have to conform to the JDK's interfaces if you don't want it to. Just something that maintains a thread pool and a queue of tasks. Add the ability to attach listeners to the executor. When the queue is empty and there are no actively executing tasks then you can notify the listeners.
Here's a quick code sketch.
Good day, everyone. Hope you're doing well. I'm a Django newbie, trying to learn the basics of RESTful development while helping in a small app project. We currently want some of our models to update accordingly based on the data we submit to them, by using the Django ORM and the fields that some of them share wih OneToMany relationsips. Currently, there's a really difficult query that I must do for one of my fields to update automatically given that filter. First, let me explain the models. This are not real, but a doppleganger that should work the same:
First we have a
Report model that is a teacher's report of a student:
ANSWERAnswered 2021-Jun-04 at 02:06
Without having an environment setup or really knowing exactly what you want out of the data. This is a good start.
Generally speaking, the Django ORM is not great for these types of queries, and trying to use select_related or prefetches results in really complex and inefficient queries.
I've found the best way to achieve these types of queries in Django is to break each piece of your puzzle down into a query that returns a "list" of ids that you can then use in a subquery.
Then you keep working down until you have your final output
hopefully there is someone here with enough experience to guide me through this particular issue I've found. So I am working with this peculiar API that returns an object akin to the following:...
ANSWERAnswered 2021-Jun-03 at 15:49
The easy way is to use the
_.flatten method of lodash to achieve this:
In Visual Studio 2019, it likes to try to guess where it should put the semicolon when you hit it. Often it will jump to a completely different line or insert newlines. Every time it does anything besides append it as the next character, this is extremely disruptive, and I have to go back and fix what it broke. This is akin to the disruptive "Automatic brace completion" which always puts braces where I don't want them, but can be turned off. I can't find anywhere to turn off the semicolon behavior. Is there any way to turn this feature off?
Most of the time when the semicolon misbehaves, it's because I hit it by mistake, but rather than hitting backspace, I now have a bigger mess to clean up. And I've never had a situation where it did something extra that I wanted it to do.
Some examples, with * being the cursor location:...
ANSWERAnswered 2021-Jun-01 at 14:34
Visual Studio 16.10 adds a new configuration option to control this:
Text Editor -> C# -> Intellisense -> Automatically complete statements on semicolon
With that checked, I get the problematic behavior described in the question. When I uncheck that option, it works as it did before.
I'm currently teaching myself Rust and am practicing by implementing Tic-Tac-Toe.
I have a Board struct (
GameState are straightforward enums,
ANSWERAnswered 2021-Jun-01 at 15:11
But now the rust compiler complains about the lack of a lifetime parameter for the returned reference in the type specifier of cell_access:
The problem here, as I understand it, is that in order to be able to write the code in this shape, the
cell_access function's signature needs to refer to the lifetime for which it is valid, and this is impossible because that lifetime doesn't have a name — it's a local reborrow of
self that's implicit in the closure creation. Your attempt with
&'a mut self doesn't work because it doesn't capture the fact that the closure's
self is a reborrow of the function's
self and accordingly does not need to live exactly the same lifetime, since mutable borrows' lifetimes are invariant rather than covariant; they can't be arbitrarily taken as shorter (because that would break the exclusiveness of mutable references).
That last point gives me an idea for how to fix this: move the
all_in_line code into a function which takes
self by immutable reference. This compiles:
I want to employ GitLab CI/CD for a test that involves two containers. The test requires that both containers are up and that a script is then run in one of them (with semantics akin to
kubectl exec ... script.sh or
docker exec ... script.sh). I've tried modeling this with
services thanks to a previous answer received:
ANSWERAnswered 2021-May-28 at 05:12
You can override the entrypoint of the image specified with the
entrypoint keyword and set it how you want it to behave.
I am building something like an ActiveRecord class for documents stored in MongoDB (akin to Mongoose). I have two goals:
Intercept all property setters on a document using a Proxy, and automatically create an update query to be sent to Mongo. I've already found a solution for this problem on SO.
Prevent unnecessary reads from the database. I.e. if a function is performed on a document, and that function only ever sets properties, and doesn't ever use an existing property of the document, then I don't need to read the document from the database, I can directly update it. However, if the function uses any of the document's properties, I'd have to read it from the database first, and only then continue on with the code. Example:...
ANSWERAnswered 2021-May-31 at 18:16
You can probably initiate an async read from within a getter (I haven't tried it, but it seems legit), but the getter can't wait for the result. So, unless your DB library provides some blocking access calls, this line, where
order.weight is fetched just in time and the value used in multiplication, will always be pure fantasy in any lazy-read regime:
I have a very specific Tomcat configuration that I don't want to change and I am looking for a solution for this specific configuration.
I have declared multiple contexts (
) for deployment inside the conf/server.xml file in Tomcat, something I know is not recommended. My problem is that if one of those deployments fail, the whole Tomcat process stops which terminates the rest of the applications that have successfully started. Is this behavior expected? Is there an attribute or a way to prevent this and emulate the behavior of distinct context declarations akin to the usage of
The error I'm getting is the following:
ConfigServletWebServerApplicationContext : Exception encountered during context initialization
with this stacktrace (for Tomcat version 8.5.24):...
ANSWERAnswered 2021-May-28 at 17:27
- an exception during the
startphase (cf. LifeCycle) of any component configured in
server.xmlcauses the server to exit. However some exceptions (like a failed
ServletContextListener) don't propagate.
- an error of a component added during runtime, does not cause the server to exit.
If you don't want the whole server to stop, when a context fails to start up, use auto-deployment: for each context defined in
server.xml create a file
$CATALINA_BASE/conf///.xml with content:
I have a matrix that is 10 rows by 4 columns. Each row represents a user, and each column a measurement. Some users only have one measurement, while others may have the full 4 measurements.
The goals I want to accomplish with this matrix are three fold:
- To subtract the user's measurements from their own measurements (across columns);
- To subtract the user's measurement from other user's measurement points (all included, across rows);
- To create a final matrix that counts the number of "matches" (comparisons) each user has against themselves and others.
Within a threshold of 2.0 units, I have tried to measure each user's measurement against their own measurement and other users by obtaining the difference with a nested for-loop.
Below is an example of what the
clean_data matrix looks like, and this matrix was used for all three goals:
ANSWERAnswered 2021-Apr-30 at 06:26
Here's one tidyverse approach. I convert the data to longer format, then join it to itself by User (across) and by time point (down), each time counting the number of matches. Then I combine the two and convert to wide format again.
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