add manual NumPy patching to mkl_fft

mkl_fft/__init__.py

@@ -39,11 +39,18 @@
     rfft2,
     rfftn,
 )
+from ._patch_numpy import (
+    is_patched,
+    mkl_fft,
+    patch_numpy_fft,
+    restore_numpy_fft,
+)
 from ._pydfti import irfftpack, rfftpack  # pylint: disable=no-name-in-module
 from ._version import __version__
 
 import mkl_fft.interfaces  # isort: skip
 
+
 __all__ = [
     "fft",
     "ifft",
@@ -60,6 +67,10 @@
     "rfftn",
     "irfftn",
     "interfaces",
+    "mkl_fft",
+    "patch_numpy_fft",
+    "restore_numpy_fft",
+    "is_patched",
 ]
 
 del _init_helper

mkl_fft/_patch_numpy.py

@@ -0,0 +1,122 @@
+#!/usr/bin/env python
+# Copyright (c) 2017, Intel Corporation
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#     * Redistributions of source code must retain the above copyright notice,
+#       this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above copyright
+#       notice, this list of conditions and the following disclaimer in the
+#       documentation and/or other materials provided with the distribution.
+#     * Neither the name of Intel Corporation nor the names of its contributors
+#       may be used to endorse or promote products derived from this software
+#       without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Define functions for patching NumPy with MKL-based NumPy interface."""
+
+from contextlib import ContextDecorator
+from threading import local as threading_local
+
+import numpy as np
+
+import mkl_fft.interfaces.numpy_fft as _nfft
+
+_tls = threading_local()
+
+
+class _Patch:
+    """Internal object for patching NumPy with mkl_fft interfaces."""
+
+    _is_patched = False
+    __patched_functions__ = _nfft.__all__
+    _restore_dict = {}
+
+    def _register_func(self, name, func):
+        if name not in self.__patched_functions__:
+            raise ValueError("%s not an mkl_fft function." % name)
+        f = getattr(np.fft, name)
+        self._restore_dict[name] = f
+        setattr(np.fft, name, func)
+
+    def _restore_func(self, name):
+        if name not in self.__patched_functions__:
+            raise ValueError("%s not an mkl_fft function." % name)
+        try:
+            val = self._restore_dict[name]
+        except KeyError:
+            print("failed to restore")
+            return
+        else:
+            print("found and restoring...")
+            setattr(np.fft, name, val)
+
+    def restore(self):
+        for name in self._restore_dict.keys():
+            self._restore_func(name)
+        self._is_patched = False
+
+    def do_patch(self):
+        for f in self.__patched_functions__:
+            self._register_func(f, getattr(_nfft, f))
+        self._is_patched = True
+
+    def is_patched(self):
+        return self._is_patched
+
+
+def _initialize_tls():
+    _tls.patch = _Patch()
+    _tls.initialized = True
+
+
+def _is_tls_initialized():
+    return (getattr(_tls, "initialized", None) is not None) and (
+        _tls.initialized is True
+    )
+
+
+def patch_numpy_fft(verbose=False):
+    if verbose:
+        print(
+            "Now patching NumPy FFT submodule with mkl_fft NumPy interface. "
+            "Please direct bug reports to https://github.com/IntelPython/mkl_fft"
+        )
+    if not _is_tls_initialized():
+        _initialize_tls()
+    _tls.patch.do_patch()
+
+
+def restore_numpy_fft(verbose=False):
+    if verbose:
+        print("Now restoring original NumPy FFT submodule.")
+    if not _is_tls_initialized():
+        _initialize_tls()
+    _tls.patch.restore()
+
+
+def is_patched():
+    if not _is_tls_initialized():
+        _initialize_tls()
+    return _tls.patch.is_patched()
+
+
+class mkl_fft(ContextDecorator):
+    def __enter__(self):
+        patch_numpy_fft()
+        return self
+
+    def __exit__(self, *exc):
+        restore_numpy_fft()
+        return False