Elastic-Net | fast version of elastic net r
kandi X-RAY | Elastic-Net Summary
kandi X-RAY | Elastic-Net Summary
A fast version of elastic net r-package based on RcppArmadillo
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Trending Discussions on Elastic-Net
QUESTION
I would like to repeat the hyperparameter tuning (alpha
and/or lambda
) of glmnet
in mlr3
to avoid variability in smaller data sets
In caret
, I could do this with "repeatedcv"
Since I really like the mlr3
family packages I would like to use them for my analysis. However, I am not sure about the correct way how to do this step in mlr3
Example data
...ANSWER
Answered 2021-Mar-21 at 22:36Repeated hyperparameter tuning (alpha and lambda) of glmnet
can be done using the SECOND mlr3
approach as stated above.
The coefficients can be extracted with stats::coef
and the stored values in the AutoTuner
QUESTION
I have a beautiful mlr3
ensemble model (combined glmnet
and glm
) for binary prediction, see details here
ANSWER
Answered 2021-Mar-21 at 22:14Thanks to missuse's comment, his marvellous tutorial (Tuning a stacked learner) and mb706's comments I think I could solve my question.
Replace "classif.cv_glmnet"
with "classif.glmnet"
QUESTION
I'm trying to set up a local Kibana instance with ActiveMQ for testing purposes. I've created a docker network called elastic-network. I have 3 containers in my network: elasticsearch, kibana and finally activemq. In my kibana container, I downloaded metric beats using the following shell command
...ANSWER
Answered 2021-Mar-17 at 22:13After looking through the documentation, I saw that for Linux, unlike the other OS, you also have to change the configuration in the module directory module.d/activemq.yml
, not just the metricbeat.reference.yml
QUESTION
library(tidyverse)
library(caret)
library(glmnet)
creditdata <- read_excel("R bestanden/creditdata.xlsx")
df <- as.data.frame(creditdata)
df <- na.omit(df)
df$married <- as.factor(df$married)
df$graduate_school <- as.factor(df$graduate_school)
df$high_school <- as.factor(df$high_school)
df$default_payment_next_month <- as.factor(df$default_payment_next_month)
df$sex <- as.factor(df$sex)
df$single <- as.factor(df$single)
df$university <- as.factor(df$university)
set.seed(123)
training.samples <- df$default_payment_next_month %>%
createDataPartition(p = 0.8, list = FALSE)
train.data <- df[training.samples, ]
test.data <- df[-training.samples, ]
x <- model.matrix(default_payment_next_month~., train.data)[,-1]
y <- ifelse(train.data$default_payment_next_month == 1, 1, 0)
cv.lasso <- cv.glmnet(x, y, alpha = 1, family = "binomial")
lasso.model <- glmnet(x, y, alpha = 1, family = "binomial",
lambda = cv.lasso$lambda.1se)
x.test <- model.matrix(default_payment_next_month ~., test.data)[,-1]
probabilities <- lasso.model %>% predict(newx = x.test)
predicted.classes <- ifelse(probabilities > 0.5, "1", "0")
observed.classes <- test.data$default_payment_next_month
mean(predicted.classes == observed.classes)
...ANSWER
Answered 2021-Mar-14 at 13:47Just like for glm
, by default the predict
function for glmnet
returns predictions on the scale of the link function, which aren't probabilities.
To get the predicted probabilities, add type = "response"
to the predict
call:
QUESTION
ANSWER
Answered 2020-Sep-09 at 22:30You define
QUESTION
I'm trying to use the Elastic-Net algorithm implemented in Cleverhans to generate adversarial samples in a classification task. The main problem is that i'm trying to use it in a way to obtain an higher confidence at classification time on a target class (different from the original one) but i'm not able to reach good results. The system that i'm trying to fool is a DNN with a softmax output on 10 classes.
For instance:
- Given a sample of class 3 i want to generate an adversarial sample of class 0.
- Using the default hyperparameters implemented in the ElasticNetMethod of cleverhans i'm able to obtain a succesful attack, so the class assigned to the adversarial sample became the class 0, but the confidence is quite low(about 30%). This also happens trying different values for the hyperparameters.
- My purpose is to obtain a quite higher confidence (at least 90%).
- For other algorithm like "FGSM" or "MadryEtAl" i'm able to reach this purpose creating a loop in which the algorithm is applied until the sample is classified as the target class with a confidence greater than 90%, but i can't to apply this iteration on the EAD algorithm because at each step of the iteration it yields the adversarial sample generated at the first step, and in the following iterations it remains unchanged. (I know that this may happens because the algorithm is different from the other two metioned, but i'm trying to find a solution to reach my purpose).
This is the code that i'm actually using to generate adversarial samples.
...ANSWER
Answered 2020-Sep-06 at 06:41For anyone intrested in this problem the previous code can be modified in this way to works properly:
FIRST SOLUTION:
QUESTION
I am running elastic net regularization in caret using glmnet
.
I pass sequence of values to trainControl
for alpha and lambda, then I perform repeatedcv
to get the optimal tunings of alpha and lambda.
Here is an example where the optimal tunings for alpha and lambda are 0.7 and 0.5 respectively:
...ANSWER
Answered 2019-Sep-08 at 06:34After a bit of playing with your code I find it very odd that glmnet train chooses different lambda ranges depending on the seed. Here is an example:
QUESTION
I'm try to code Elastic-Net. It's look likes:
And I want to use this loss function into Keras:
...ANSWER
Answered 2019-Aug-02 at 06:24You can simply use built-in weight regularization in Keras for each layer. To do that you can use kernel_regularizer
parameter of the layer and specify a regularizer for that. For example:
QUESTION
Is Lasso regression or Elastic-net regression always better than the ridge regression?
I'm a newbie in machine learning. I've conducted these regressions on a few data sets and I've always got the same result that the mean squared error is the least in lasso regression. Is this a mere coincidence or is this true in any case?
...ANSWER
Answered 2019-May-25 at 06:28I think this question might be better suited for the cross-validation sub-forum.
On the topic, James, Witten, Hastie and Tibshirani write in their book "An Introduktion to Statistical Learning":
These two examples illustrate that neither ridge regression nor the lasso will universally dominate the other. In general, one might expect the lasso to perform better in a setting where a relatively small number of predictorshave substantial coefficients, and the remaining predictors have coefficients that are very small or that equal zero. Ridge regression will perform better when the response is a function of many predictors, all with coefficients of roughly equal size. However, the number of predictors that is related to the response is never known apriori for real data sets. A technique such as cross-validation can be used in order to determine which approach is betteron a particular data set. (chapter 6.2)
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Install Elastic-Net
install Rcpp and RcppArmadillo
install fasterElasticNet
install fasterElasticNet without openmp supporting Usually using clang with xcode
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