How do I add indexes to MySQL tables?

I've got a very large MySQL table with about 150,000 rows of data. Currently, when I try and run SELECT * FROM table WHERE id = '1'; the code runs fine as the ID field is the primary...

JavaScript: Object Rename Key

Is there a clever (i.e. optimized) way to rename a key in a javascript object? A non-optimized way would be: o[ new_key ] = o[ old_key ]; delete o[ old_key ];

Media Query for Android Devices

I have my site optimized for OS and iOS, but testing it for Android through browserstack.com has left me puzzled about targeting Android devices in my media queries. Here is my query that works...

What is the smallest possible valid PDF?

Out of simple curiosity, having seen the smallest GIF, what is the smallest possible valid PDF file?

Eclipse optimize imports to include static members and methods

Long user of eclipse and Java. One issue that i've found with Eclipse, is it seems that there is no easy way to import static members and methods. Namely, the jUnit fail() method from...

Why is memmove faster than memcpy?

I am investigating performance hotspots in an application which spends 50% of its time in memmove(3). The application inserts millions of 4-byte integers into sorted arrays, and uses memmove to...

Run a query with a LIMIT/OFFSET and also get the total number of rows

For pagination purposes, I need a run a query with the LIMIT and OFFSET clauses. But I also need a count of the number of rows that would be returned by that query without the LIMIT and OFFSET...

Get confidence limits from Gaussian Process model in Python GPy

I calcualted a Gaussian Process model in Python using GPy: ker0 = GPy.kern.Bias(input_dim=1,variance=1e-2) ... m = GPy.models.GPRegression(x, y, ker0+ker2) I can plot it...

Scipy.optimize Inequality Constraint - Which side of the inequality is considered?

I am using the scipy.optimize module to find optimal input weights that would minimize my output. From the examples I've seen, we define the constraint with a one-sided equation; then we create a...

Save and load kernel in GPy in a sparse gaussian process regression

I built and optimized a Sparse Gaussian Process Regression model using the GPy library. The documentation recommends to save the model as follow: To save a model it is best to save the...

Optimization when Shuffle write is large and spark task become super slow

There's a SparkSQL which will join 4 large tables (50 million for first 3 table and 200 million for the last table) and do some group by operation which consumes 60 days of data. and this SQL will...

Scipy Optimize is only returning x0, only completing one iteration

I am using scipy optimize to get the minimum value on the following function: def randomForest_b(a,b,c,d,e): return abs(rf_diff.predict([[a,b,c,d,e]])) I eventually want to be able to get the...

.Net C# RESTSharp 10 Minute Timeout

I have embedded a browser control into a .Net form and compiled it as a window's executable. The browser control is displaying our HTML5 image viewer. The application opens sockets so it can...

Gridsearchcv vs Bayesian optimization

Which one among Gridsearchcv and Bayesian optimization works better for optimizing hyper parameters?

scipy.optimize.minimize does not stop at maxiter or callback

I've implemented scipy.optimize.minimize to minimize the mean of delta values of a pandas data frame for a 1D Array with 128 values. It seems to run and do stuff, but it doesn't stop at maxiter or...

Why does Script Evaluation take so long?

I'm using gatsbyjs and tried to optimize my webpage (https://www.r%C3%BCn.run) as much as possible. Running PageSpeed gives me some decent results. What I'm wondering is, why Script Evaluation is...

Replicate XL GRG Nonlinear solver

I am trying to replicate with R this optimization problem for which the XL solver seems to do the job (I am assuming it's a decent one); I seem to fail getting the package/function ticking all the...

SIMD instructions lowering CPU frequency

I read this article. It talked about why AVX-512 instruction: Intel’s latest processors have advanced instructions (AVX-512) that may cause the core, or maybe the rest of the CPU to run slower...

How to share weights between modules in Pytorch?

What is the correct way of sharing weights between two layers(modules) in Pytorch? Based on my findings in the Pytorch discussion forum, there are several ways for doing this. As an example, based...

What does Using join buffer (Block Nested Loop) mean with EXPLAIN mysql command in the Extra column?

I am trying to optimize my query. And getting Using join buffer (Block Nested Loop) for one of the table with EXPLAIN SELECT command. I have no idea what does it mean. I tried googling about, but...

How to write a query to find Median of column in a Table in MySql?

I was trying to solve problem in Hackerrank SQL Practice section and stuck in Problem 'Weather Observation Problem 20'. To find Median, I though of the following approach: sub-query to count the...

How to Save/Load Optimized GPy Regression Model

I'm trying to save my optimized Gaussian process model for use in a different script. My current line of thinking is to store the model information in a json file, utilizing GPy's built-in...

How to reproduce results of GPy GPRegression using scikit-learn Gaussian Process Regressor?

Both GPRegression (GPy) and Gaussian Process Regressor (scikit-learn) uses similar initial values and the same optimizer (lbfgs). Why results vary significantly? #!pip -qq install pods #!pip -qq...

Angular 11 Inlining of fonts failed

Trying to build angular11 app in a system behind proxy. When running "ng build --prod" I get this error: Inlining of fonts failed. An error has occurred while...

python inputs on windows optimized ? ( and xbox guide button possible to detect ? )

*In Short : any suggestion on how to listen to Xbox guide button ? or any suggestion on how to make "inputs" more optimized and faster for low-end PCs ?* hey. I had been looking for a way to...

Getting all subsets from subset sum problem on Python using Dynamic Programming

I am trying to extract all subsets from a list of elements which add up to a certain value. Example - List = [1,3,4,5,6] Sum - 9 Output Expected = [[3,6],[5,4]] Have tried different approaches...

"VirtualizedList: You have a large list that is slow to update" warning even though all components are optimized

I've been having lots of trouble trying to avoid getting the "VirtualizedList: You have a large list that is slow to update" warning when using a <FlatList> component with React-Native. I've...

Java update from 11.0.11 to 11.0.13 changes JVM code cache behavior and results in more process cpu usage and strange profiled nmethods memory usage

We run a complex clustered application with Java 11.0.11 and -XX:ReservedCodeCacheSize=375m with the same load profile attached 24/7 without any restarts. After we updated AdoptOpenJDK...

C poor performance compared to Julia

I wanted to create a formal comparison between C and Julia performance. For this purpose I wanted to compare different sorting algorithms, starting with the bubble. In Julia I wrote it like: using...

TypeError: MiniCssExtractPlugin is not a constructor

[webpack-cli] TypeError: MiniCssExtractPlugin is not a constructor at module.exports (/home/andrey/smartadmin-app/webpack.config.js:70:9) at loadConfigByPath...