python多进程编程
def defin_canv(w, h):
canvas = np.zeros((h, w))
canvas[y0 - 1:y1, x0 - 1:x1] = 1
return canvas
result = []
pool = multiprocessing.Pool()
#将对象放入到类别中，包含了返回的对象
for anno in box:
result.append(pool.apply_async(defin_canv, args=(w, h)))
pool.close()
pool.join()
# 将数据取出来
for i in range(faces):
canvas[i] = result[i].get()def defin_canv(w, h):
canvas 
