@bagder

128-bit math is ... tricky. We implemented a 128-bit type for n-dimensional arrays to represent images in our #ImgLib2 library for image processing. So many gotchas in defining basic arithmetic operations; at some point in version history all our custom implementations were replaced by java's BigInteger's.
https://github.com/imglib/imglib2/blob/master/src/main/java/net/imglib2/type/numeric/integer/Unsigned128BitType.java

Our motivating use case? Integral images (summed-area table: https://en.wikipedia.org/wiki/Summed-area_table ). But now the 128-bit type has found other uses too.

Why would one want to run machine learning inference from #java?

To do so on 3D, 4D, ND datasets, trivially accessible from image processing and visualization libraries such as #ImgLib2, the #BigDataViewer, #LabKit and more, all integral parts of #FijiSc.

* LabKit: https://imagej.net/plugins/labkit/

* BigDataViewer: https://imagej.net/plugins/bdv/

* ImgLib2: https://imagej.net/libs/imglib2/

* Fiji: https://fiji.sc

@christianp

Unrelated – yet reminds me of the time we implemented unsigned integer division for 128-bit numbers ... in the end we delegated it to java's BigInteger: https://github.com/imglib/imglib2/blob/master/src/main/java/net/imglib2/type/numeric/integer/Unsigned128BitType.java

#ImgLib2

@b0rk For fast integer modulo computation in #java programs. For example, in the #ImgLib2, a type-, dimension-, and storage-independent high-performance image processing library. Here, an example in a pixel type with 4 bits only:

// Same as (i * 4) % 64
final long shift = ( j << 2 ) & 63;

From the Unsigned4BitType class: https://github.com/imglib/imglib2/blob/master/src/main/java/net/imglib2/type/numeric/integer/Unsigned4BitType.java#L105

@benoitmandelbot How nice–love the colors, looks tropical.

There is an example using the #ImgLib2 library implementing the computation and rendering at arbitrary depth of the #Mandelbrot set.

The main class to run it: https://github.com/imglib/imglib2-tutorials/blob/master/src/test/java/interactive/fractals/MandelbrotDemo.java

The viewer implementation:
https://github.com/imglib/imglib2-tutorials/blob/master/src/main/java/interactive/MandelbrotRealViewer2DExample.java

The Mandelbrot math bits, in a separate #java class: https://github.com/imglib/imglib2-tutorials/blob/master/src/main/java/interactive/fractals/MandelbrotRealRandomAccessible.java