python 多线程稀疏矩阵乘法

import threading, time
import numpy as np
res = []
class MyThread(threading.Thread):
    def __init__(self,i,j,m1,m2):
        threading.Thread.__init__(self)
        self.x, self.y = i,j
        self.m1, self.m2 = m1, m2
    def run(self):
        global res, lock
        if lock.acquire():
            m1 = self.m1[self.m1[:,0]==self.x]
            m2 = self.m2[self.m2[:,1]==self.y]
            value = 0.
            for item1 in m1:
                for item2 in m2:
                    if item1[1] == item2[0]:
                        value += item1[2]*item2[2]
            res.append([self.x,self.y,value])
            lock.release()
if "__main__" == __name__:
    m1 = [[2,2],[0,0,1],[0,1,2],[1,0,3],[1,1,4]]
    m2 = [[2,3],[0,0,2],[0,2,1],[1,2,3],[1,1,4]]
    s1, s2 = m1[0], m2[0]
    assert s1[1]==s2[0], 'mismatch'
    m1_value = np.array(m1[1:])
    m2_value = np.array(m2[1:])  
    rows, cols = s1[0], s2[1]
    res.append([rows, cols])
    ThreadList = []
    lock = threading.Lock()
    for i in range(rows):
        for j in range(cols):
            t = MyThread(i,j,m1_value,m2_value)
            ThreadList.append(t)
    for t in ThreadList:
        t.start()
    for t in ThreadList:
        t.join()
    print (res)