Minutes_2019_11_04

Numba Meeting: 2019-11-04

Attendees: Siu, Aaron, Pearu, Todd, Val, Stuart, Ehsan, James

Py3.8 patch #4755
- no patch release. because too much changes
- plan to release with 0.47 end-of-year release
pytest/CI
- pytest changes on hold (25% test throughput penalty on 4 cores compared to current test runner)
- git-diff and sliced testing port to current numba.runtests
- faster public CI turn-around; 10ish mins
Y2020 Q1 Spring cleaning project board:
- https://github.com/numba/numba/projects/12
bitshifting: https://github.com/numba/numba/issues/4786
- numpy: (np.uint64(255) << 1) -> TypeError
- again, np-integer vs py-integer casting rules

#4778 - Numba v0.46.0 issue when executing umap
#4775 - Malloc Error when checking array flag
- bug on arr.flags
#4773 - jitclass member array assignments do not type promote
- probably setattr not promoting
**** #4772 - String rjust/ljust/center slow to compile
- compiler performance
- Things to look at:
  - big IR?
  - compiling same thing over again?
- Discussion:
  - not much benefit to on-the-fly compilation
  - consider shipping pre-compiled code
#4771 - is there any method to calculate massive regression by the power of GPU?
#4765 - Error initialising ROC
#4764 - Adding a transposed tensor gives unexpected (wrong) result
#4763 - Numba 0.46.0 depends on pkg_resources but does not declare a setuptools dependency
- conda meta.yaml fix
#4761 - Build time/pip package. Using PyPy7.2 with Python level 3.6 doesn’t means using Windows.
#4759 - NUMBA_DISABLE_JIT breaks @generated_jit
- another reason for coverage support
#4758 - convert float to string within numba function
- not easy to do
#4754 - Passing a Tuple of Numpy arrays to cfunc (scipy.integrate.quad)
- Siu will take a look
- structure cast
#4752 - Profiling only the running time of a jit-decorated function
- save compilation time

#4774 - Can't unify return type from the following types: array(float32, 2d, C), array(float64, 2d, C)
#4766 - how to use the jitclass without the spec parameter
#4757 - numba-RNG in 2D threads

#4780 - [WIP] Implement np.gcd and math.gcd
#4779 - Make slice constructor more similar to python.
**** #4777 - Fix transpose output array layout
- it should not need to degrade to A layout
- Siu will look
#4776 - Fix and enable idle tests from test_array_manipulation
#4770 - Update np.arange implementation with @overload
- Need to check compile_isolated
#4769 - [WIP] objmode complex type spelling
#4768 - Update typeconv error message to ask for sys.executable.
#4760 - Make type_callable return the decorated function
**** #4756 - Add parfor support for ndarray.fill.
- Todd will simplify it a little with find_call_name
- Further clean up and move to new style in springcleaning
**** #4755 - Python3.8 support
**** #4753 - [WIP] pytest

CPython 3.8
Requests for 0.47 (last release for the year) - jitclass performance issues - llvm 9 trial - CTK libcudadevrt.a - CI needs to take 50% of current time - Val & Stu already looking at this - also checking Azure CI config to avoid wasting compute time - Caching: - transitive dependency - other issues: i.e. function as argument, with objmode - distributing cache - Immutable list and deprecating reflected list - Switch to pytest (see above) - Using Numba to generate LLVM/NVVM IR for different targets https://github.com/numba/numba/issues/4546 - @overload for gpu