Replace cpuCount function with call to os.cpu_count

doc/acknowledgement.txt

@@ -15,10 +15,6 @@ Acknowledgements
 * All Theano users that have given us feedback.
 * The GPU implementation of tensordot is based on code from Tijmen
   Tieleman's `gnumpy <http://www.cs.toronto.edu/~tijmen/gnumpy.html>`_
-* The original version of the function ``cpuCount()`` in the file
-  `theano/misc/cpucount.py` come from the project `pyprocessing
-  <http://pyprocessing.berlios.de/>`_. It is available under the same license
-  as Theano.
 * Our random number generator implementation on CPU and GPU uses the MRG31k3p algorithm that is described in:
 
     P. L'Ecuyer and R. Touzin, `Fast Combined Multiple Recursive Generators with Multipliers of the form a = +/- 2^d +/- 2^e <http://www.informs-sim.org/wsc00papers/090.PDF>`_, Proceedings of the 2000 Winter Simulation Conference, Dec. 2000, 683--689.

theano/configdefaults.py

@@ -24,7 +24,6 @@ from theano.configparser import (
     StrParam,
     TheanoConfigParser,
 )
-from theano.misc.cpucount import cpuCount
 from theano.misc.windows import call_subprocess_Popen, output_subprocess_Popen
 from theano.utils import maybe_add_to_os_environ_pathlist
 
@@ -1083,8 +1082,8 @@ if var:
         default_openmp = not int(var) == 1
 else:
     # Check the number of cores availables.
-    count = cpuCount()
-    if count == -1:
+    count = os.cpu_count()
+    if count is None:
         _logger.warning(
             "We are not able to detect the number of CPU cores."
             " We disable openmp by default. To remove this"

theano/misc/cpucount.py

-# Copyright (c) 2006-2008, R Oudkerk
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions
-# are met:
-#
-# 1. Redistributions of source code must retain the above copyright
-#    notice, this list of conditions and the following disclaimer.
-# 2. 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.
-# 3. Neither the name of author nor the names of any contributors may be
-#    used to endorse or promote products derived from this software
-#    without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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
-#
-
-import multiprocessing
-
-
-def cpuCount():
-    """
-    Returns the number of CPUs in the system
-    """
-    try:
-        return multiprocessing.cpu_count()
-    except NotImplementedError:
-        return -1