From: Debian Science Team <debian-science-maintainers@lists.alioth.debian.org>
Date: Wed, 26 Aug 2020 21:34:50 +0000 (+0100)
Subject: Allow some numba exceptions on 32 bit systems, warn on non-x86
X-Git-Tag: archive/raspbian/1.0.5+dfsg-3+rpi1^2~7
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=87e47a4815336fa0e3f4a0366aea58b2a04d0b9e;p=pandas.git

Allow some numba exceptions on 32 bit systems, warn on non-x86

Specifying the exception type allows only explicit errors,
not silently wrong answers

Numba has been observed to give wrong answers on mipsel
and crash on ppc64el.

Author: Rebecca N. Palmer <rebecca_palmer@zoho.com>
Forwarded: no


Gbp-Pq: Name numba_fail_32bit.patch
---

diff --git a/pandas/core/window/numba_.py b/pandas/core/window/numba_.py
index d6f28c90..eab974a9 100644
--- a/pandas/core/window/numba_.py
+++ b/pandas/core/window/numba_.py
@@ -6,7 +6,10 @@ import numpy as np
 
 from pandas._typing import Scalar
 from pandas.compat._optional import import_optional_dependency
-
+import platform
+import re
+import warnings
+warn_numba_platform = "Non-x86 system detected, Numba may give wrong results or crash" if not bool(re.match('i.?86|x86',platform.uname()[4])) else False
 
 def make_rolling_apply(
     func: Callable[..., Scalar],
@@ -37,6 +40,8 @@ def make_rolling_apply(
     Numba function
     """
     numba = import_optional_dependency("numba")
+    if warn_numba_platform:
+        warnings.warn(warn_numba_platform)
 
     if parallel:
         loop_range = numba.prange
diff --git a/pandas/tests/window/test_numba.py b/pandas/tests/window/test_numba.py
index cc8aef17..1b006d11 100644
--- a/pandas/tests/window/test_numba.py
+++ b/pandas/tests/window/test_numba.py
@@ -5,9 +5,15 @@ import pandas.util._test_decorators as td
 
 from pandas import Series
 import pandas._testing as tm
+from pandas.compat import is_platform_32bit
+try:
+    from numba.core.errors import UnsupportedParforsError
+except ImportError:
+    UnsupportedParforsError = ImportError
 
 
 @td.skip_if_no("numba", "0.46.0")
+@pytest.mark.xfail(condition=is_platform_32bit(), raises=UnsupportedParforsError, reason="some Numba functionality is not available on 32 bit systems", strict=False)
 @pytest.mark.filterwarnings("ignore:\\nThe keyword argument")
 # Filter warnings when parallel=True and the function can't be parallelized by Numba
 class TestApply: