Really what does this have to do with APL ( Ken Iverson )??
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This is NOT APL.
Futhark is a functional language, we will start with the obligatory factorial program:
fun fact (n: i32): i32 = reduce () 1 (map (1+) (iota n))
This has nothing to do with APL.
Perhaps a more apt title would be "Python for the GPU".j
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There is a paper on this subject, where an APL interpreter is written in FUTARK, but then most compilers are written in C. In reality the technology in question is Futark on GPU.