Optimization-Algorithms | Optimization methods | Learning library
kandi X-RAY | Optimization-Algorithms Summary
kandi X-RAY | Optimization-Algorithms Summary
Optimization methods
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Top functions reviewed by kandi - BETA
- Calculate the gradient of the Poisson distribution .
- Run rozenbrock .
- Calculate the conjugated direction of a point .
- Calculate the Newton - Newton step .
- Compute the svenn step .
- Compute the partan function for a given point .
- Implementation of Hook - Jeeves .
- Calculate the Pauell stage .
- Svenn stage method
- Calculate the DSCowell Powell .
Optimization-Algorithms Key Features
Optimization-Algorithms Examples and Code Snippets
Community Discussions
Trending Discussions on Optimization-Algorithms
QUESTION
I'm hitting a confusing error while trying to run the lme4::allFit()
using some built-in parallelization. I fit an initial model m0
, which uses a larger dataframe ckDF
(n = 265,623 rows) to model a binary response to a number of categorical and continuous predictors in a logistic framework with a random intercept for year.
I'm interested in determining whether different optimizers yield different results, following some recommendations I've found online (e.g. by @BenBolker here). My data is fairly large and takes ~20 minutes to run usually, so I'm hoping to use the parallel
and ncpus
parameters of allFit()
to speed it up a bit. Here's my relevant code:
ANSWER
Answered 2019-Dec-27 at 21:11Thanks to @user20650 & @Ben Bolker for the tips in comments above -- it worked and I was able to get allFit()
to run as expected, by ensuring I use parallel = "snow"
in my function call since I'm running in Windows. Just posting the edited code here for anyone else who finds this useful:
QUESTION
I want to minimize a function like below:
Here, n can be 5,10,50 etc. I want to use Matlab and want to use Gradient Descent and Quasi-Newton Method with BFGS update to solve this problem along with backtracking line search. I am a novice in Matlab. Can anyone help, please? I can find a solution for a similar problem in that link: https://www.mathworks.com/help/optim/ug/unconstrained-nonlinear-optimization-algorithms.html .
But, I really don't know how to create a vector-valued function in Matlab (in my case input x can be an n-dimensional vector).
...ANSWER
Answered 2019-Apr-15 at 19:30You will have to make quite a leap to get where you want to be -- may I suggest to go through some basic tutorial first in order to digest basic MATLAB syntax and concepts? Another useful read is the very basic example to unconstrained optimization in the documentation. However, the answer to your question touches only basic syntax, so we can go through it quickly nevertheless.
The absolute minimum to invoke the unconstraint nonlinear optimization algorithms of the Optimization Toolbox is the formulation of an objective function. That function is supposed to return the function value f
of your function at any given point x
, and in your case it reads
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Install Optimization-Algorithms
You can use Optimization-Algorithms like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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