可以使用Cython来加速小于号运算,实现更快的比较操作。
具体步骤如下:
安装Cython:
pip install cython
编写比较函数:
def less(a, b): cdef int i cdef Py_ssize_t n = a.shape[0] cdef np.ndarray[bool, ndim=1] result = np.zeros(n, dtype=bool) for i in range(n): if a[i] < b[i]: result[i] = True return result
使用Cython编译:
python setup.py build_ext --inplace
在代码中使用编译好的函数:
import numpy as np import time import pyximport pyximport.install()
from less import less
a = np.random.rand(1000000) b = np.random.rand(1000000)
start_time = time.time() result = np.less(a, b) end_time = time.time()
print("numpy.less takes", end_time - start_time, "seconds")
start_time = time.time() result = less(a, b) end_time = time.time()
print("Cython less takes", end_time - start_time, "seconds")
通过以上步骤,可以发现Cython实现的less函数比numpy.less要快很多。