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2017-10-13 09:38:43 +08:00 回复了 rogwan 创建的主题 › Python › 相比 Python 代码， Cython 实际提升的性能有多大？ |
如果涉及数值计算的话，numba 可能用起来更方便，cython 毕竟还要显性配置些东西
2017-10-13 09:20:20 +08:00 回复了 rogwan 创建的主题 › Python › 相比 Python 代码， Cython 实际提升的性能有多大？ |
Ref: http://notes-on-cython.readthedocs.io/en/latest/std_dev.html
Example:
def pyStdDev(a):
mean = sum(a) / len(a)
return math.sqrt((sum(((x - mean)**2 for x in a)) / len(a)))
In summary:
================= ============ ================== =====================
Method Time (ms) Compared to Python Compared to Numpy
================= ============ ================== =====================
Pure Python 183 x1 x0.03
Numpy 5.97 x31 x1
Naive Cython 7.76 x24 x0.8
Optimised Cython 2.18 x84 x2.7
Cython calling C 2.22 x82 x2.7
================= ============ ================== =====================
Example:
def pyStdDev(a):
mean = sum(a) / len(a)
return math.sqrt((sum(((x - mean)**2 for x in a)) / len(a)))
In summary:
================= ============ ================== =====================
Method Time (ms) Compared to Python Compared to Numpy
================= ============ ================== =====================
Pure Python 183 x1 x0.03
Numpy 5.97 x31 x1
Naive Cython 7.76 x24 x0.8
Optimised Cython 2.18 x84 x2.7
Cython calling C 2.22 x82 x2.7
================= ============ ================== =====================
2017-05-17 08:45:19 +08:00 回复了 diveIntoWork 创建的主题 › 程序员 › 坚果云无法同步.git 文件夹，有什么好的替代工具吗？ Linux 端 |
- bitbucket 可以免费放私有代码
- yandex disk 试试看?
- yandex disk 试试看?
2016-09-07 18:37:20 +08:00 回复了 zmrenwu 创建的主题 › Python › 1 亿条数据如何使用 Pandas 去重？ |
blaze 或 dask ，语法类似 pandas ，比数据库和 Hadoop 都轻
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