leaps | A pair programming service using operational transforms
kandi X-RAY | leaps Summary
kandi X-RAY | leaps Summary
Leaps is a service for collaboratively editing your local files over a web UI, using operational transforms to ensure zero-collision synchronization across any number of editing clients. WARNING: This project is no longer actively maintained.
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Trending Discussions on leaps
QUESTION
I have been working my way through R ISLR College dataset and I'm wanting to perform the best subset selection on the training set, and plot the training set MSE associated with the best model of each size.
...ANSWER
Answered 2021-Apr-10 at 02:42regfit.full <- regsubsets(Apps ~ ., data = collegetrain, nvmax = 20)
train.mat <- model.matrix(Apps ~ ., data = collegetrain, nvmax = 20)
val.errors <- rep(NA, 20)
for (i in 1:17) {
coefi <- coef(regfit.full, id = i)
pred <- train.mat[, names(coefi)] %*% coefi
val.errors[i] <- mean((pred - collegetrain$Apps)^2)
}
plot(val.errors, xlab = "Number of predictors", ylab = "Training MSE",
pch = 19, type = "b")
QUESTION
For a course I'm attending, I have to perform a logistic stepwise regression to reduce the number of predictors of a feature to a fixed number and estimate the accuracy of the resulting model.
I've been trying with regsubsets()
from the leaps package, but I can't get its accuracy.
Now I'm trying with caret
, because I can set its metric to "Accuracy", but I can't fix the number of predictors when I use method = "glmStepAIC"
in the train()
function, because it has no tune parameters.
ANSWER
Answered 2021-Mar-21 at 05:22You can specify the number of variables to keep in stepwise selection using the glmulti
package. In this example columns a through g are related to the outcome, but columns A through E are not. In glmulti, confsetsize
is the number of models to select and set minsize
equal to maxsize
for the number of variables to keep.
QUESTION
I am trying to get Github Action to check my package. The packages compiles fine (not even a note) on my computer. I created a yaml script to go into the github workflow directory using usethis::use_github_action_check_standard()
but it fails with a bunch of warnings like
No files were found with the provided path: check. No artifacts will be uploaded.
The path check is a temporary directory created by rcmdcheck
for storing files. So, I presume it is a problem connected with this command. But everything was created by the usethis utility and nobody else seems to have the same problem.
I looked around a lot and the last fix I tried was to manually add a step to install imported and suggested packages, as suggested in this post, to no avail.
What am I doing wrong? Thanks in advance.
the yaml script is
...ANSWER
Answered 2021-Mar-07 at 08:33I solved the problem by moving everything to the main branch.
QUESTION
I'm using regsubsets
from the leaps
library to perform the best subset selection. I need to compare the coefficients it generates to the "true" coefficients I specified when simulating the data (by comparison, meaning, the difference between them squared, and the square root taken of the sum), for each number of predictors.
Since there are 16 different models that regsubsets
generated, I use a loop to do this automatically. It would work except that when I extract the coefficients from the best model fit with x predictors, it only gives me the non-zero coefficients of the polynomial fit. This messes up the size of the coefi
vector causing it to be smaller in size than the truecoef
true coefficients vector.
If I could somehow force all coefficients to be spat out from the model, I wouldn't have an issue. But after looking extensively, I don't know how to do that.
Alternative ways of solving this problem would also be appreciated.
...ANSWER
Answered 2021-Feb-13 at 00:05This is how I ended up solving it (with some help):
The loop indexes which coefficients are available and performs the subtraction, for those unavailable, it assumes they are zero.
QUESTION
So I just discovered the very interesting Quake III inverse square root hack. After learning how it works and all, I decided to test it. I found that the hack only outperformed math.h 1/sqrt(X) when compiled with optimizations enabled.
The hack's implementation:
...ANSWER
Answered 2021-Jan-21 at 11:09As you said, most of modern CPUs include a Floating Point Unit that usually provides a hardware instruction to compute square root. FPUs also provide division instructions so I would expect your processor (although I don't know it) to be able to compute an inverse sqrt in only a few assembly instructions. Your results are a bit surprising: you should check whether the FPU is really used. I don't know Ryzen but on ARM processors you can compile your software to use either hardware floating point instructions or software libraries.
Now to answer your questions: GCC optimizations are a complex story and it is usually impossible to predict precisely the effect of a given level on performance. So run some tests as you did, or have a look here for theory.
QUESTION
I've been using Selenium for some time to scrape a website but for some reasons it doesn't work anymore. I was using Selenium because you need to interact with the site to flip through pages (ie: click on a next button).
As a solution, I was thinking of using Post method from Requests. I'm not sure if its doable since I've never used the Post method, and since I not familiar with what it does (though I kind of understand the general idea).
My code would look something like that:
...ANSWER
Answered 2021-Jan-06 at 19:32The following should do the trick. I've added duplicate filtering logic to avoid printing duplicate links. The script should break once there are no more results left to scrape.
QUESTION
I am new to python and I'm building a web crawler to go through a list of articles on the internet and grab the text from them. When I use the function get_text(url)
, however, I am getting a lot of unnecessary text before and after the actual article content.
I do not know what to classify it as other than unnecessary (sorry for being vague). There is an example below.
Here is my code:
...ANSWER
Answered 2021-Jan-05 at 17:54Instead of grabbing the text of whole body
tag like:
text = soup.body.get_text()
Make it a bit more specific and just grab the article
tag like:
article = ''.join([p.get_text() for p in soup.select_one('article').select('p')][1:-1])
What happens there?
soup.select_one('article')
selects thearticle
tagselect('p')
selects allp
tags in result ofsoup.select_one('article')
[p.get_text() for p in soup.select_one('article').select('p')]
is looping over all results fromselect('p')
and generating a list of its textslast step is joining
''.join()
all elements together, excluding the first and the last one by list slicing[1:-1]
QUESTION
I was trying to shorten the process of passing the formula to the regsubsets() function instead of having to write the full string. So, I used the following code for generation of formula string but the regsubsets function gave the error "argument "y" is missing".
When I pasted the generated formula string without quotes, it was accepted. But when I pasted formula string within quotes, the same error was generated. So, it seems to me that, the quotes are the problem.
How can I bypass this error?
Is there another function that can pass a string argument without quotes to such picky functions?
Here's the code sample:
...ANSWER
Answered 2020-Dec-18 at 15:37You're on the right track about the quotes. These indicate that you are passing a character string (fstr
) rather than a formula to regsubsets
. But a character string is not a formula, even if it is a character string of a formula. Turning a character string of a formula into an actual formula is as easy as as.formula(fstr)
.
So that minor modification produces this result:
QUESTION
I have heard its a conventional practice to store program dependent files in /usr/share/application-folder
in linux. So I'm trying to do it in my c program in a function called load_interface_files()
for example. I am not sure if this is a good practice or not, I've heard about creating configuration files for this kind of issues.
Anyways, here's the the code I wrote to make a directory in /usr/share
.
ANSWER
Answered 2020-Dec-01 at 04:25use ls -ld /usr/share
to see what the permissions on the directory are (without -d
, you get the contents and their permissions).
Use code like:
QUESTION
I would like to calculate the In-sample and Out-of-sample predictive accuracy for certain metrics, all while using carets' k-fold-cross validation.
So far I have got
...ANSWER
Answered 2020-Oct-25 at 12:41If you don't mind fitting the model twice, you will set the testing and training folds first, using an example dataset BostonHousing
where medv
is the dependent variable:
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