Add norm API for vectors

[T45K]

What

added norm APIs for vector type (i.e., MultiArray<Float, D1> and MultiArray<Double, D1>).
in this implementation, reusing existing norm methods by using origin vector (mk.zeros(size)).

Why

currently, there are norm methods accepting only matrix (i.e., MultiArray<Number, D2>).
however, NumPy provides norm methods for vector.
sample: https://stackoverflow.com/a/43043160

i think it is better to provide the similar API for usability.

Questions

• in this PR, i added new methods to norm.kt, but should i add them to LinAlgEx.kt file?
• where should i add tests?

[devcrocod]

Thank you very much for the changes.

In this PR, I added new methods to norm.kt, but should I add them to the LinAlgEx.kt file?

No, since you are reusing existing implementations, you don't need to add them to LinAlgEx.kt. That file contains methods whose implementations reside in other modules.

Where should I add tests?

Since norm has two implementations, you need to test them in both modules:

In the Kotlin implementation: KELinAlgTest.kt
In the native (OpenBLAS) implementation: NativeLinAlgTest.kt
You don't need to write complex tests. You can use the test from the native implementation as a reference: NativeLinAlgTest.kt, Line 318.

[T45K]

@devcrocod
thank you for advice!
i added tests to both of two test classes.

however, unfortunately, i don't have OpenBLAS env on my local.
so, may i ask you to execute tests i added to NativeLinAlgTest instead of me?

[devcrocod]

All tests have passed.
Thank you very much for your contribution.

I can't say exactly when I will be able to release a new artifact with these changes, as I currently need to completely change the build infrastructure. This is further complicated by issues with the latest versions of Xcode.