| import numpy as np |
|
|
| cimport cython |
| cimport numpy as np |
|
|
| from cython.parallel import prange |
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|
|
|
| @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 |
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|
|
|
| @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) |
|
|
