Minutes_2018_01_25

Numba Meeting: 2018-01-25

Attendees: Ehsan, Stan, Todd, Siu

numba#2689: Numba 0.36.2 tests fail on npy114, py27, win64
- Sporadic error. Unable to reproduce w/ Anaconda packages.
numba#2699: prange fails when temporary numpy array object created in the loops
- Looks like overhead associated with array allocation and atomic reference counts inside of loops
- Any mitigation? (User should use random module for random scalars that don't require array allocation?)
Python 3.6 / Win32&Win64 failures on test_matmul_mm disappeared after numpy 1.14.0 build update from 0 -> 1?
- Seems to have been fixed by changes to NumPy 1.14 build on Windows to correct some MKL issues.
New question on numba#2627: Can Numba 0.36.2 be used with llvmlite 0.22 (dev)? Will there be deadlocks, or just an unnecessary amount of extra locking?

numba#2703: Test runner feature: failed-first and last-failed
- Make it easier to track down problems in big test suite
numba#2702: Make DummyArray do High Dimensional Reshapes
numba#2694: Avoid type inference failure due to a typing template rejection
- @ehsantn to review
numba#2681: Allow Assigning to DeviceNDArrays
- @sklam to re-review now that blocker has been merged
numba#2672: Add ascontinguousarray
- Blocker is merged. Just need to fix conflict.
numba#2668: Fix empty_like from readonly array
- Contributor may have disappeared? We should add the tests.
numba#2660: Support bools from cffi in nopython
- Contributor working on improving tests.

Reach out to the community about the Gufunc rewrite.
Pipeline refactor question.
- How to handle https://github.com/numba/numba/pull/2398 ?
- Worried about opening up API that changes compiler behavior.
- Complicated by other issues with pipeline (i.e. rewrite pass mutate IR #2657)