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From Andrew Ayres <andrew.f.ay...@gmail.com>
Subject Feedback request for new Java API
Date Thu, 27 Sep 2018 22:25:13 GMT
Hi,

Currently, we're working to implement a new Java API and would like some
feedback from the community on an implementation detail. In short, the new
Java API will use the existing Scala API (in a manner similar to how the
current Clojure API works). This basically means that we're making Java
friendly wrappers to call the existing Scala API.

The feedback we're looking for is on the implementation of NDArray. Scala's
NDArray has a significant amount of code which is generated via macros and
we've got two viable paths to move forward:

1.) Change the macro to generate Java friendly methods  - To do this we'll
modify the macro so that the generated methods won't have default/optional
arguments. There may also have to be some changes to parameter types to
make them Java friendly. The big advantage here is that ongoing maintenance
will easier. The disadvantages are that we'll be changing the existing
Scala NDArray Infer API (it's marked experimental) and Scala users will
lose the ability to use the default and optional arguments.

2.) Leave the existing macro in place and add another which generates a
Java friendly version - The biggest issue here is that we'll be doubling
the number of macros that we've got to maintain. It'll become even more
overhead once we start expanding the Java API with more classes that use
generated code like this. The advantages are that the existing Scala
NDArray Infer API would remain unchanged for Scala users and that the new
macro could be optimized to give the best possible experience to the Java
API.

Thanks,
Andrew

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