1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
# tag: openmp
# You can ignore the previous line.
# It's for internal testing of the cython documentation.
# distutils: extra_compile_args=-fopenmp
# distutils: extra_link_args=-fopenmp
import numpy as np
cimport cython
from cython.parallel import prange
ctypedef fused my_type:
int
double
long long
# We declare our plain c function nogil
cdef my_type clip(my_type a, my_type min_value, my_type max_value) nogil:
return min(max(a, min_value), max_value)
@cython.boundscheck(False)
@cython.wraparound(False)
def compute(my_type[:, ::1] array_1, my_type[:, ::1] array_2, my_type a, my_type b, my_type c):
cdef Py_ssize_t x_max = array_1.shape[0]
cdef Py_ssize_t y_max = array_1.shape[1]
assert tuple(array_1.shape) == tuple(array_2.shape)
if my_type is int:
dtype = np.intc
elif my_type is double:
dtype = np.double
elif my_type is cython.longlong:
dtype = np.longlong
result = np.zeros((x_max, y_max), dtype=dtype)
cdef my_type[:, ::1] result_view = result
cdef my_type tmp
cdef Py_ssize_t x, y
# We use prange here.
for x in prange(x_max, nogil=True):
for y in range(y_max):
tmp = clip(array_1[x, y], 2, 10)
tmp = tmp * a + array_2[x, y] * b
result_view[x, y] = tmp + c
return result
|
