File size: 1,368 Bytes
ae8e1dd |
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 |
import numpy as np
cimport numpy as np
cimport cython
from cython.parallel import prange
@cython.boundscheck(False)
@cython.wraparound(False)
cdef void maximum_path_each(int[:,::1] path, float[:,::1] value, int t_x, int t_y, float max_neg_val) nogil:
cdef int x
cdef int y
cdef float v_prev
cdef float v_cur
cdef float tmp
cdef int index = t_x - 1
for y in range(t_y):
for x in range(max(0, t_x + y - t_y), min(t_x, y + 1)):
if x == y:
v_cur = max_neg_val
else:
v_cur = value[x, y-1]
if x == 0:
if y == 0:
v_prev = 0.
else:
v_prev = max_neg_val
else:
v_prev = value[x-1, y-1]
value[x, y] = max(v_cur, v_prev) + value[x, y]
for y in range(t_y - 1, -1, -1):
path[index, y] = 1
if index != 0 and (index == y or value[index, y-1] < value[index-1, y-1]):
index = index - 1
@cython.boundscheck(False)
@cython.wraparound(False)
cpdef void maximum_path_c(int[:,:,::1] paths, float[:,:,::1] values, int[::1] t_xs, int[::1] t_ys, float max_neg_val=-1e9) nogil:
cdef int b = values.shape[0]
cdef int i
for i in prange(b, nogil=True):
maximum_path_each(paths[i], values[i], t_xs[i], t_ys[i], max_neg_val)
|