cython

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 2 years ago . I am looking for a solution to add pre-compiler logic in a cython file. I have written a cython wrapper for a hardware device API that is in C++. This is a cython project that is typically compiled using MSVC for python 2.7 and 3.6. The entire package is written in cython without need for an

问题 I have read this question and answer -Cython nogil with ThreadPoolExecutor not giving speedups and I have a similar problem with my Cython code not getting the speedup that is expected in spite of my system having multiple cores. I have 4 physical cores on a Ubuntu 18.04 instance and if I make the number of jobs to be 1 in the code below it runs faster than when I make it 4. Looking at the CPU usage using top I see the CPU usage go upto 300 %. I am doing the lookup of a data structure in a C+

问题 I have had success in sending numpy arrays to c functions with Cython. Whenever I have a function in c that takes int * and I have some variable in python, call it arr , that is 1D numpy array I just call the function with &arr[0] and it works. Now I'm interested in receiving a 2D array created with a c function. How can I do this? Below is what I've tried. // this is the c code that returns a 2D array int **make_array() { int nrows = 3; int ncols = 5; int **ret = malloc(nrows * sizeof(int *)

问题 from libcpp.algorithm cimport sort as stdsort from libcpp.algorithm cimport unique from libcpp.vector cimport vector # from libcpp cimport bool cimport cython @cython.boundscheck(False) @cython.wraparound(False) @cython.initializedcheck(False) cdef class Vector: cdef vector[cython.int] wrapped_vector # the easiest thing to do is add short wrappers for the methods you need def push_back(self, int num): self.wrapped_vector.push_back(num) def sort(self): stdsort(self.wrapped_vector.begin(), self

问题 I saw this sample code from the Pyrobuf page for serializing an integer ~3 times faster than via struct.pack : def ser2(): cdef int x = 42 return (<char *>&x)[:sizeof(int)] I was wondering how this could be done for a group of integers. I saw cython has int[:] and array.array types, but I still don't understand how do I take a list of integers for example, and get the same (but faster) result as via struct.pack('i', *num_list) . map() didn't seem work faster for me, and I'm wondering how this

问题 I'm fairly new to cython, so I have a basic question. I'm trying to import a base class from one cython file into another cython file to define a derived class. I have the following code in a single directory called cythonTest/ : afile.pxd afile.pyx bfile.pxd bfile.pyx __init__.py setup.py afile.pxd: cdef class A: pass afile.pyx: cdef class A: def __init__(self): print("A__init__()") bfile.pxd: from afile cimport A cdef class B(A): pass bfile.pyx: cdef class B(A): def __init__(self): print "B

问题 As far as I understood the pure python mode, it seems possible to use a script python with augmenting pxd in order to use the python function directly in a C program. I am looking for a way to do so since I am stuck on the program compilation with the following errors: gcc -L/usr/local/python-gnu-2.7.8/lib -lpython2.7 -I/usr/local/python-gnu-2.7.8/include/python2.7 -I. -L. -lfoo -o main main.o main.o: In function `main': /d/sverley/Etudes/SIMELING/LivBinh052018/static_model/test_cython/main.c

问题 I'm following CS231n and met a problem when doing assignment2: ConvolutionalNetworks: global name 'col2im_6d_cython' is not defined . I think the problem was due to a failure in importing functions from im2col_cython.pyx , which used cython. I've installed Xcode 7.3.1, as shown below, but the problem was still not solved. I'm running the ipynb files in Jupyter from Anaconda. There is a related discussion on reddit, but unfortunately the solution here was for Windows, not Mac OS X. Thank you

问题 when I try to install ta-lib(a technical analysis library coded originally in C) for Python using a wrapper for Python and Cython, I get an error message saying "Must use python with unicode enabled". I have already tried googling to no avail. Here's the full error message: C:\Python27\Lib\site-packages\ta-lib-master>python setup.py install running install running build running build_ext skipping 'talib.c' Cython extension (up-to-date) building 'talib' extension C:\Program Files (x86)

问题 I try to compile the OpenSource Cython Project(https://github.com/seanbell/intrinsic) with gcc. But something is wrong when I use the orde "python setup.py build_ext -i". I have spent several days on it, but it doesn't work and returns the following error when building. C:\intrinsic-master\bell2014\krahenbuhl2013>python setup.py build_ext -i Compiling krahenbuhl2013.pyx because it changed. Cythonizing krahenbuhl2013.pyx Error compiling Cython file: --------------------------------------------