lamda | Light Asynchronous Module Definition Alternative | Reactive Programming library

Well there is no obvious advantage in using the second approach, maybe for some class of matrices it will be better, I would suggest you to test with the problems you want to solve. Since you are transforming the eigenvectors, this will also transform how the errors affect the solution, and maybe that is the reason for using this second method, not efficiency, but numerical accuracy, or convergence.

Another thing is that the second method will only work for symmetric B.

You can use Expression.Coalesce here so that it will replace possible null value with "" so the string functions will not fail.

Here is the similar code fixing the same issue:

Policies code block isn't indented far enough

The lambda IS being passed as an argument to setOnClickListener!

You can test this by trying button?.setOnClickListener({ }) and noticing it still compiles.

Android Studio then suggests changing it to button?.setOnClickListener(){ }, as Kotlin's coding convention dictates:

If a call takes a single lambda, pass it outside of parentheses whenever possible.

This gives us button?.setOnClickListener(){ }.

The () is marked as redundant, due to "Remove unnecessary parentheses from function call with lambda" leading to... button?.setOnClickListener { }!

Note: You can ctrl / cmd click the function name and the signature shows public void setOnClickListener(@Nullable OnClickListener l)

Currently there is no possibility to access Parameter Store variables from Sam Local as you can read up here.

Instead, you can use --env-vars option on SAM CLI to pass values to the running function.

The method reference matches Function. When the compiler looks at the method Student::getGrade, it sees that that method takes zero parameters, so it uses the Student object passed to apply as the implicit first parameter. (This will work for any functional interface where the abstract method exactly matches the referenced method except that it takes an additional first parameter of the target type.) In lambda form, it would look like this:

you need to call connection.commit() to reflect the change in database

Well, you should describe your data and model output better. I suppose the data is a pandas dataframe and you are using sklearn to preprocess your data.

First you need to normalize your data, so I suppose somewhere in your code you had a MinMaxScaler or some sklearn transformation, that mapped an entire column of your dataframe to values between 0 and 1, from your code it seems it was the column_scaler. So you have to un-normalize those values to be real (cash values) by using inverse_transform. So a y_pred value of 0 becomes the lowest value you originally had on your data, suppose $10,29.

Then you are converting the price predictions to true-false values (boolean) checking if the price in the future is higher than the price in the present (looking LOOKUP_STEP ticks ahead).

With this array that tells only if prices go up or not, you calculate the Jaccard Score (from sklearn I suppose) that just tells you how many UP prices you got right in relation to the ones you got wrong.

If you did not execute those post-processing steps the accuracy_score would give a different value, I am not sure if it even accept floats as values, it would give an error.

The initial value is missing for the array reducer method, whereas in express code initial value is defined.