Minutes_2023_01_17

Numba Meeting: 2023-01-17

Attendees: Siu Kwan Lam, Andre Masella, brandon willard, Graham Markall, Luk, stuart, Todd A. Anderson, Guilherme, Ianna Osborne, FPOC (last week): Siu FPOC (incoming): Stuart

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

Please refer to this calendar for the next meeting date.

0. Discussion

• (discussed in triage) Add in a GHA to lock closed issues after ~ a week
  • conda/conda-build may have a lock bot for reference
  • Graham to follow up with a PR sometime in future
• (discussed in triage) OrcJITv2 status
  • https://github.com/gmarkall/llvmlite/tree/orcjit-tidied
  • Based on a version of Andre's LLVM 14 branch:
    • Current diff
  • Why do we use the C API?
    • Original intention was to reduce maintenance burden?
    • In practice it comes with its own overheads
  • Extra notes:
    • Going to try and get this into llvmlite soon.
    • Should be on par with MCJIT binding.
• (discussed in triage) Remove pinned message on Discourse
  • should be done
• (discussed in triage) Gitter switching to Matrix:
  • https://blog.gitter.im/2023/01/16/gitter-is-going-fully-native-matrix-in-feb-2023/
• (stuart) Need to decide whether to try making dynamic exceptions fully dynamic now or defer this xref #8134.
  • review as is.
  • make change for full dynamic + boxer for 0.58
• (Guilherme) Fixed length strings in Numba
  • Numba compile a new function for each fixed length string

  @njit
  def f(a):
      return len(a)
  
  In [1]: f(np.array(['foo', 'bar', 'bar'], dtype='U3'))
  Out[1]: 3
  
  In [2]: f(np.array(['foo', 'bar', 'bar'], dtype='U4'))
  Out[2]: 3
  
  In [3]: f.signatures
  Out[3]:
  [(array([unichr x 3], 1d, C)),
   (array([unichr x 4], 1d, C))]

  • New dtype work in NumPy may allow for this
  • Codebase assumes type size to be known
  • Question about use case. Large functions that end up being recompiled.
• (Guilherme) Update numba-scipy CI config
  • Deprecate Azure CI in favor of GitHub Actions?
    • maybe; wait for Val
  • Bump Numba version? Current numba-scipy is being tested with Numba 0.47.
    • Yes. latest released numba
  • Similarly, use a matrix combination of the last X versions of SciPy and Python
    • Yes. x=3, perhaps use oldest and newest versions of python supported by Numba.
• (Luk) Question on Roadmap in gitter/Discourse.
  • In the coming weeks should set this out for 2023 (near term).
• (Luk) Cache invalidation PR (#8396), 0.57, 0.58 or PR backlog?
  • Q. Was this waiting for splitting up lowering and typing? A. No!
  • Added to 0.58 milestone.
• Math RFC numba#8700.

New "Ready for Review" PRs

1. New Issues

• numba#8699 - Cannot create datetime64 array spec for jitclass
• *** numba#8700 - RFC: Separate NumPy and CPython implementions/functionality.
• numba#8703 - Numba and Debian Bookworm
• numba#8705 - np.cos, np.sin, np.sqrt returning incorrect values in very specific scenarios
  • libSVML is probably correct
  • But, LLVM SVML passes might have issues
• numba#8707 - Move baseline supported NumPy version to 1.21.
• numba#8708 - Raise a warning if fastmath options nnan/ninf are in use with isnan or isinf
• numba#8709 - numba stencil too slow
• numba#8712 - LoweringError when using is with jitclass
• numba#8713 - Allow lazy compilation with explicit signature
• numba#8715 - Support for CUDA 12.0

Closed Issues

• numba#8710 - numpy array layout is not determined correctly when passed as jitclass property
• numba#8714 - NvvmError: Failed to compile IR version 1.6 incompatible with current version 2.0 <unnamed>: error: incompatible IR detected. Possible mix of compiler/IR from different releases. NVVM_ERROR_IR_VERSION_MISMATCH

2. New PRs

• numba#8702 - Supply concrete timeline for objmode fallback deprecation/removal.
• numba#8704 - Added traceback printing capability while NRT debugging
• numba#8706 - Fix doctest for @vectorize
• numba#8711 - [CI only] testing patch for #8670
• llvmlite#898 - Wrap LLD into python

Closed PRs

• merged - numba#8701 - Relaxed ULP testing precision for NumPy Generator tests across all systems
• merged - numba#8716 - CI: Use set -e in "Before Install" step and fix install
• merged - llvmlite#899 - Run Minconda install with bash

3. Next Release: Version 0.57.0/0.40.0, RC Jan 2023