Revert "clear repo: test 2."

This reverts commit 7ab225d330.

gklearn/utils/unfinished/openblassettings.py

@@ -0,0 +1,86 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Created on Wed Dec 19 15:31:01 2018
+A script to set the thread number of OpenBLAS (if used). 
+Some modules (such as Numpy, Scipy, sklearn) using OpenBLAS perform parallel 
+computation automatically, which causes conflict when other paralleling modules 
+such as multiprossing.Pool, highly increase the computing time. By setting 
+thread to 1, OpenBLAS is forced to use single thread/CPU, thus this conflict 
+can be avoided.
+-e.g:
+    with num_threads(8):
+    np.dot(x, y)
+@author: ali_m
+@Reference: `ali_m's answer <https://stackoverflow.com/a/29582987>`__, 2018.12
+"""
+
+import contextlib
+import ctypes
+from ctypes.util import find_library
+import os
+
+# Prioritize hand-compiled OpenBLAS library over version in /usr/lib/
+# from Ubuntu repos
+try_paths = ['/opt/OpenBLAS/lib/libopenblas.so',
+             '/lib/libopenblas.so',
+             '/usr/lib/libopenblas.so.0',
+             find_library('openblas')]
+openblas_lib = None
+for libpath in try_paths:
+    try:
+        openblas_lib = ctypes.cdll.LoadLibrary(libpath)
+        break
+    except OSError:
+        continue
+if openblas_lib is None:
+    raise EnvironmentError('Could not locate an OpenBLAS shared library', 2)
+
+
+def set_num_threads(n):
+    """Set the current number of threads used by the OpenBLAS server."""
+    openblas_lib.openblas_set_num_threads(int(n))
+
+
+# At the time of writing these symbols were very new:
+# https://github.com/xianyi/OpenBLAS/commit/65a847c
+try:
+    openblas_lib.openblas_get_num_threads()
+    def get_num_threads():
+        """Get the current number of threads used by the OpenBLAS server."""
+        return openblas_lib.openblas_get_num_threads()
+except AttributeError:
+    def get_num_threads():
+        """Dummy function (symbol not present in %s), returns -1."""
+        return -1
+    pass
+
+try:
+    len(os.sched_getaffinity(0))
+    def get_num_procs():
+        """Get the total number of physical processors"""
+        return len(os.sched_getaffinity(0))
+except AttributeError:
+    def get_num_procs():
+        """Dummy function (symbol not present), returns -1."""
+        return -1
+    pass
+
+
+@contextlib.contextmanager
+def num_threads(n):
+    """Temporarily changes the number of OpenBLAS threads.
+
+    Example usage:
+
+        print("Before: {}".format(get_num_threads()))
+        with num_threads(n):
+            print("In thread context: {}".format(get_num_threads()))
+        print("After: {}".format(get_num_threads()))
+    """
+    old_n = get_num_threads()
+    set_num_threads(n)
+    try:
+        yield
+    finally:
+        set_num_threads(old_n)