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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_y, int t_x, float max_neg_val=-1e9) 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[y-1, x]
if x == 0:
if y == 0:
v_prev = 0.
else:
v_prev = max_neg_val
else:
v_prev = value[y-1, x-1]
value[y, x] += max(v_prev, v_cur)
for y in range(t_y - 1, -1, -1):
path[y, index] = 1
if index != 0 and (index == y or value[y-1, index] < value[y-1, index-1]):
index = index - 1
@cython.boundscheck(False)
@cython.wraparound(False)
cpdef void maximum_path_c(int[:,:,::1] paths, float[:,:,::1] values, int[::1] t_ys, int[::1] t_xs) nogil:
cdef int b = paths.shape[0]
cdef int i
for i in prange(b, nogil=True):
maximum_path_each(paths[i], values[i], t_ys[i], t_xs[i])
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