# Roadmap

## Cython backend (beta version)

Less bugs and more Cython features... Note that unfortunately we are [limited
by Cython bugs](backends/cython.md)!

- [done] Header also for Pythran (`.pythran`)

- [done] Refactore backends "for method"

- [done] Recompile if header changed

- [done] test_run.py: also check signature files

- [done] Fused types rather than more than one signature for

  - [done] boost functions
  - [done] boost methods
  - [done] blocks
  - [done] jit functions
  - [done] jit methods

- [done] BackendJITCython

- [done] Check/fix

  - [done] boost methods
  - [done] blocks
  - [done] jit functions
  - [done] jit methods

- [done] Cython decorators (boundscheck, wraparound, cdivision, nonecheck)

- [done] void type

- [done] Correct use of fused types (only 1 set of annotations supported)

- Special function definitions

  - [done] inline
  - [done] return type
  - nogil

- better fused types

- nogil context manager

- casting

- locals annotations for

  - boost methods
  - blocks
  - jit functions
  - jit methods

- "exterior" functions + understand the tests

## Better Numba backend

- `numba.jit` (not only `numba.njit`)
- `fastmath` argument

## `transonic.dataclass` decorator

It would allow one to use `numba.jitclass` and Cython extension type.

A interesting goal would be to rewrite [pygbm](https://github.com/ogrisel/pygbm) (written in Numba) with Transonic. Note
that the Cython translation is [here](https://github.com/scikit-learn/scikit-learn/tree/master/sklearn/ensemble/_hist_gradient_boosting)
in scikit-learn. Good Rosetta stone!

## Backends as Transonic extensions

We can try that with [pyccel](https://github.com/pyccel/pyccel).

## Alternative syntax for blocks

See [issue #6](https://foss.heptapod.net/fluiddyn/transonic/issues/6)

## Alternative implementations for specified backends

Which API?

## Parallelism

We can already use OpenMP with Transonic-Pythran. But OpenMP pragmas are not
understood by the other backends. Numba and Cython use different notations
(with `prange`):

- <https://cython.readthedocs.io/en/latest/src/userguide/parallelism.html>
- <https://numba.pydata.org/numba-doc/dev/user/parallel.html>

## PyCapsule & `numba.cfunc`

- <https://docs.python.org/3/c-api/capsule.html>
- <https://serge-sans-paille.github.io/pythran-stories/the-capsule-corporation.html>
- <https://numba.pydata.org/numba-doc/dev/user/cfunc.html>