Running a different mapper on different input files

[Dane]

Good-day

I have an assignment wherein I have to do matrix multiplication. I am given two files in the matrix-market format, i.e. 

matrixA.list

2 3      <- dimensions

0 0 1   <- entries

0 1 2

0 2 3

1 0 4

1 1 5

1 2 6

I am struggling to develop the (key, value) pairs.

I currently run the program like this: python MatrixMulti.py matrixA.list matrixB.list

I would like to either run a different mapper for each file so that I can identify the origin matrix in the (key,value) pair, but I don't know how to do this. Is this the best approach?

Thanks.

below is my python code.

from mrjob.job import MRJob

class MrMatrixMultiplier(MRJob):

def mapper_init(self):

self.ROWS = 0

self.COLS = 0

self.kvpairs = []

def mapper(self, _, line):

line_list = line.split(' ')

if (len(line_list) == 2):

[self.ROWS, self.COLS] = line_list

else:

self.i = line_list[0]

self.j = line_list[1]

self.v = line_list[2]

for k in range(1, int(self.ROWS)):

print [[self.i, k],['A', self.j, self.v]]

def reducer(self, key, values):

yield key, sum(values)

if __name__ == '__main__':

MrMatrixMultiplier.run()