Minutes_2023_10_31

Numba Meeting: 2023-10-31

Attendees: Siu, Stuart, Guilherme, Da Li, Jim Pivarski, Dipto FPOC (last week): Siu FPOC (incoming): Graham

NOTE: All communication is subject to the Numba Code of Conduct.

Please refer to this calendar for the next meeting date.

triage topics:

Outcome of the nopython=False survey? Issue #9247. Conclusion: Most uses appear accidental, nothing of concern.
Conda-forge Numba 0.58.1 build has a numerical error in a couple of complex ufuncs , arcsinh and arctanh?
- Outcome so far is that it's been debugged and it points to an issue in libm.
- Action: stuart, see if a ticket filed against glibc/libm correlates with this.
- Action: others, go check that it's been debugged ok.
- Conclusion: if there's a ticket/it reproduces ok, then suggest CF just skips the tests for now.
ufunc.at https://github.com/numba/numba/pull/9239, doesn't work for "fancy indexing" is this a merge blocker? Conclusion: no, numba main fork has branch fea/adv_indexing which may help fix the broken cases.

numba#9252 - File output within njit
- Adding support for ctypes.c_char_p would be useful. Maybe also .encode().
numba#9254 - njit(parallel=True) & prange are ineffective on Google Colab
numba#9256 - Defining variables in Parfors loop break lowering
numba#9257 - Typed Dict compiling hangs with NumPy unicode strings tuple key
- Discussed an issue with NumbaError being recoverable vs. non-recoverable. It's probably a good idea to have a split based on an internal field in the exception so that the compiler can ICE if it's non-recoverable and also capture the source location (which would not be possible if a plain Python exception class were raised).
- Suggested final patch on the issue to "remember" the function typing that failed will struggle with e.g. targets and flags in its current form?

numba#9253 - [CI ONLY] py312 branch changes for the buildfarm
- down to <25 tests failing on py3.12
- failing reasons: CFG error, tracing problems
numba#9255 - Fix SSA to consider variables whose use is not dominated by the definition