obviously | Open Robotic Vision and Utilities Library | Robotics library
kandi X-RAY | obviously Summary
kandi X-RAY | obviously Summary
Open Robotic Vision and Utilities Library You can install all neccessary packages by using the installObviously script Type "sudo ./installObviously" to the terminal.
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QUESTION
I've come across an issue of trying to fade the edges of the background image of a div so that it looks like it's blending with the background image of the full site (so the background image applied to the body).
...ANSWER
Answered 2021-Jun-16 at 02:49You can use the background as gradient where the edges are rgba(0,0,0,0). This way it will smoothly blend with background. But this will not work for images. For images You will have to a div of background color and rgba(0,0,0,0) in gradient with color facing outward.
QUESTION
I am new to rust and I was reading up on using futures
and async / await
in rust, and built a simple tcp server using it. I then decided to write a quick benchmark, by sending requests to the server at a constant rate, but I am having some strange issues.
The below code should send a request every 0.001 seconds, and it does, except the program reports strange run times. This is the output:
...ANSWER
Answered 2021-Jun-15 at 20:06You are not measuring the elapsed time correctly:
total_send_time
measures the duration of thespawn()
call, but as the actual task is executed asynchronously,start_in.elapsed()
does not give you any information about how much time the task actually takes.The
ran in
time, as measured bystart.elapsed()
is also not useful at all. As you are using blocking sleep operation, you are just measuring how much time your app has spent in thestd::thread::sleep()
Last but not least, your
time_to_sleep
calculation is completely incorrect, because of the issue mentioned in point 1.
QUESTION
Given MySQL tables something like this1:
...ANSWER
Answered 2021-Jun-15 at 13:49If there is a one-to-one mapping, you can join
back using the type column:
QUESTION
I have a Spring Boot app with a Kafka Listener implementing the BatchAcknowledgingMessageListener interface. When I receive what should be a single message from the topic, it's actually one message for each line in the original message, and I can't cast the message to a ConsumerRecord.
The code producing the record looks like this:
...ANSWER
Answered 2021-Jun-15 at 17:48You are missing the listener type configuration so the default conversion service sees you want a list and splits the string by commas.
QUESTION
The highest Y position that is shown in my camera is 5 and -5. For the X its 10. I'm making a tower defense game and I want the tower to follow my mouseposition after I buy it until I click on a place in the track to build/ place it. I got so confused because I couldn't see my tower at all but now I realized that my mouse coordinates are HUGE. It's up to the hundreds on each axis. My screen obviously can't fit that. I tried even dividing the mouseposition in a vector 2 by 45 and making an offset so it can fit well. Unfortunately I have to change the values depending on the screen size so that can't work. I don't know if it matters but here's my script? This script get's called after the tower gets instantiated from the store. The store button is in the canvas if that helps? Maybe the canvas is why everything is off? How do I fix it?
...ANSWER
Answered 2021-Jun-15 at 15:03In Unity, Input.MousePosition
is measured in terms of pixels on your screen. Let's say you have a 1080p monitor - 1920 x 1080 - which is pretty common these days, that means Input.MousePosition
will be in the following range when your game is fullscreen:
- x: 0 to 1919
- y: 0 to 1079
The actual world units - the units as seen in your scene - don't matter at all and can be basically anything.
Another thing of note is that your gameworld is 3D and the physical screen is 2D. Assuming your camera is looking into open space in your world, a single pixel on the screen is represented by an infinite line in the 3D world. This line is called a ray, and you can turn a 2D screen position into a ray via Camera.ScreenPointToRay, and then find what 3D objects that line intersects with via a Physics.Raycast.
QUESTION
I am having a dataset which contains the absolute HIV cases of four US State over 2 years.
There are three columns date
(Jan 2018, Feb 2018 ...) , state
(CA, NY, FL, MA) , and abs_cases
in the data frame. I am ignoring the population changes in those 2 years in the respective states.
I now want to calculate the relative cases for each state using the population for each state which I googled. (I will just use fantasy numbers here) pop<- "CA"= 11111, "NY"= 22222, "FL"= 33333,"MA"= 444444
.
I already tried using
...ANSWER
Answered 2021-Jun-15 at 14:40Without an example dataset, here is my guess at what you are trying to do. You can convert pop
into a dataframe using enframe
and join it to df
by state
. Then, you can compute the cases per population by each State in each month.
QUESTION
I have a data frame with the name of the objects, the values of each one, and another column with the type of the object ('A', 'B', 'C'). Something like that (I can't put here my data because the data frame is too large, but this example may help)
NameId Value Type 1 243394 A 2 7494 B 3 243394 C 4 243394 A 5 2437794 B 6 243 C 7 65654 CI want to plot the boxplot of all the objects (this means A, B and C together), and the objects of the type 'A' and 'B'. Three boxplots in total. But doing :
ggplot(data, aes(x=type, y= values))+ geom_boxplot()
I get the boxplots of the types A, B, and C, obviously, but what I want is have a boxplot with all the objects, another with the objects type A and another with the object type B.
And when I try to do it in another way I get the error:
...ANSWER
Answered 2021-Jun-15 at 14:37Using the iris
data set as an example.
Iris contains three Species: setosa versicolor virginica.
To solve your question, we need to use the dataset twice.
First, with the Species name renamed "All Species" using mutate
.
And second, with the Species 'setosa' excluded through filter
.
Then we use union
function to merge the two data sets (the "all data", and the data excluding one group).
QUESTION
There are so many questions around that deal with finding the most common value in an array, but all of them return the "first" element in case of a tie. I need the highest value from the list of tied elements, imagine something like this:
...ANSWER
Answered 2021-Jun-15 at 14:30Not sure how you'd go about solving this with Numpy, as there is no way to alter the tie-breaking logic of argmax
, but you can do it with collections.Counter
easily:
QUESTION
I have a two dimensional numpy arrays which describes a list of coordinates where something happens. There are two events on the scene and I would like to calculate where those two are. But I do have difficulties to distinguish those two since there isn't any good pattern from event to event.
Example:
...ANSWER
Answered 2021-Jun-15 at 13:53There are all manner of clustering algorithms and many are implemented in scikit-learn.cluster. They are well documented and the docs have nice examples, but the various algorithms have trade-offs which can take a while to figure out. For example if you have a general idea about how spaced the clusters are (reflected in the eps
ilon parameter) you can get good results with DBSCAN:
QUESTION
Yet another question about the style and the good practices. The code, that I will show, works and do the functionality. But I'd like to know is it ok as solution or may be it's just too ugly?
As the question is a little bit obscure, I will give some points at the end.
So, the use case.
I have a site with the items. There is a functionality to add the item by user. Now I'd like a functionality to add several items via a csv-file.
How should it works?
- User go to special upload page.
- User choose a csv-file, click upload.
- Then he is redirected to the page that show the content of csv-file (as a table).
- If it's ok for user, he clicks "yes" (button with "confirm_items_upload" value) and the items from file are added to database (if they are ok).
I saw already examples for bulk upload for django, and they seem pretty clear. But I don't find an example with an intermediary "verify-confirm" page. So how I did it :
- in views.py : view for upload csv-file page
ANSWER
Answered 2021-May-28 at 09:27a) Even if obviously it could be better, is this solution is acceptable or not at all ?
I think it has some problems you want to address, but the general idea of using the filesystem and storing just filenames can be acceptable, depending on how many users you need to serve and what guarantees regarding data consistency and concurrent accesses you want to make.
I would consider the uploaded file temporary data that may be lost on system failure. If you want to provide any guarantees of not losing the data, you want to store it in a database instead of on the filesystem.
b) I pass 'uploaded_file' from one view to another using "request.session" is it a good practice? Is there another way to do it without using GET variables?
There are up- and downsides to using request.session.
- attackers can not change the filename and thus retrieve data of other users. This is also the reason why you should not use a GET parameter here: If you used one, attackers could simpy change that parameter and get access to files of other users.
- users can upload a file, go and do other stuff, and later come back to actually import the file, however:
- if users end their session, you lose the filename. Also, users can not upload the file on one device, change to another device, and then go on with the import, since the other device will have a different session.
The last point correlates with the leftover files problem: If you lose your information about which files are still needed, it makes cleaning up harder (although, in theory, you can retrieve which files are still needed from the session store).
If it is a problem that sessions might end or change because users clear their cookies or change devices, you could consider adding the filename to the UserProfile
in the database. This way, it is not bound to sessions.
c) At first my wish was to avoid to save the csv-file. But I could not figure out how to do it? Reading all the file to request.session seems not a good idea for me. Is there some possibility to upload the file into memory in Django?
You want to store state. The go-to ways of storing state are the database or a session store. You could load the whole CSVFile and put it into the database as text. Whether this is acceptable depends on your databases ability to handle large, unstructured data. Traditional databases were not originally built for that, however, most of them can handle small binary files pretty well nowadays. A database could give you advantages like ACID guarantees where concurrent writes to the same file on the file system will likely break the file. See this discussion on the dba stackexchange
Your database likely has documentation on the topic, e.g. there is this page about binary data in postgres.
d) If I have to use the tmp-file. How should I handle the situation if user abandon upload at the middle (for example, he sees the confirmation page, but does not click "yes" and decide to re-write his file). How to remove the tmp-file?
Some ideas:
- Limit the count of uploaded files per user to one by design. Currently, your filename is based on a timestamp. This breaks if two users simultaneously decide to upload a file: They will both get the same timestamp, and the file on disk may be corrupted. If you instead use the user's primary key, this guarantees that you have at most one file per user. If they later upload another file, their old file will be overwritten. If your user count is small enough that you can store one leftover file per user, you don't need additional cleaning. However, if the same user simultaneusly uploads two files, this still breaks.
- Use a unique identifier, like a UUID, and delete the old stored file whenever the user uploads a new file. This requires you to still have the old filename, so session storage can not be used with this. You will still always have the last file of the user in the filesystem.
- Use a unique identifier for the filename and set some arbitrary maximum storage duration. Set up a cronjob or similar that regularly goes through the files and deletes all files that have been stored longer than your specified maximum duration. If a user uploads a file, but does not do the actual import soon enough, their data is deleted, and they would have to do the upload again. Here, your code has to handle the case that the file with the stored filename does not exist anymore (and may even be deleted while you are reading the file).
You probably want to limit your server to one file stored per user so that attackers can not fill your filesystem.
e) Small additional question : what kind of checks there are in Django about uploaded file? For example, how could I check that the file is at least a text-file? Should I do it?
You definitely want to set up some maximum file size for the file, as described e.g. here. You could limit the allowed file extensions, but that would only be a usability thing. Attackers could also give you garbage data with any accepted extension.
Keep in mind: If you only store the csv as text data that you load and parse everytime a certain view is accessed, this can be an easy way for attackers to exhaust your servers, giving them an easy DoS attack.
Overall, it depends on what guarantees you want to make, how many users you have and how trustworthy they are. If users might be malicious, you want to keep all possible kinds of data extraction and resource exhaustion attacks in mind. The filesystem will not scale out (at least not as easily as a database).
I know of a similar setup in a project where only a handful of priviliged users are allowed to upload stuff, and we can tolerate deletion of all temporary files on failure. Users will simply have to reupload their files. This works fine.
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