Minutes_2021_03_16

Numba Meeting: 2021-03-16

Attendees: kalyan, Ehsan, Todd, Jim P., Graham, Stuart, Siu, Val, Guilherme

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

0.53.0 Regression
- dynamic gufunc pickling error
- cuda regression
  - cuda array interface doesn't work w/ mapped arrays
Follow up on Mentorship program
- draft: https://hackmd.io/I364JFMkSYmA_T3qwZyeSQ
- Q: ~~how long should the program last?~~ how often to review program? 4 weeks
- Q: minimal commitment: 3 mos
- Q: do we need changes to the current triage rotation?
  - pairing rotation gives mentees more experience
- Q: max number participants: ~3
- once graduated:
  - participants become long term triager
  - gains GH triager rights(?)
- criteria:
  - commitment on long term contribution
FP flags not modelled in LLVM
- 4-5 issues
- make FAQ
- Related LLVM thread:
  - https://lists.llvm.org/pipermail/llvm-dev/2018-May/123529.html
  - https://llvm.org/docs/LangRef.html#constrained-floating-point-intrinsics

#6825 - reflected list behaves differently on Python 3.7 and 3.8
- likely array comprehension bug
#6824 - Array contains non-contiguous buffer error even after using np.ascontiguousarray
- legit bug
#6821 - REGRESSION: guvectorized functions can no longer be pickled in numba 0.53
- will need a 0.53.1 release
- fix is probably quite small
#6819 - RuntimeWarning: invalid value when disabling AVX2
- error-model not propagated
- LLVM optimization moves instruction ignoring FP-flags
#6812 - NumPy 1.20 numerical regressions
- caused by a change in np1.20

#6822 - [WIP] Add support for np.rot90
- Also being discussed on: https://numba.discourse.group/t/use-np-transpose-with-axes-argument-for-arbitrary-array-dimension/612/4
- get's into some tricky parts of Numba
#6818 - CUDA: Support IPC on Windows
#6817 - Update changelog for 0.53.0 final release date
#6814 - Improving context stack
#6813 - Mostly CUDA: Replace llvmpy API usage with llvmlite APIs
- Needs to be icmp_signed or icmp_unsigned
- Fails only for CUDA 9.0 10.0