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map_reduce_mat_mul.py
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map_reduce_mat_mul.py
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from mrjob.job import MRJob
from mrjob.step import MRStep
class MatrixMultiplication(MRJob):
def __init__(self, m, n, k):
self.m = m
self.n = n
self.k = k
def mapper(self, _, line):
i, j, v = line.split()
i = int(i)
j = int(j)
v = float(v)
if i < self.m and j < self.n:
yield (i, j), (v, 1)
def reducer(self, key, values):
v = 0
n = 0
for v, n in values:
v += v
n += n
yield key, (v, n)
def mapper2(self, key, value):
i, j = key
v, n = value
if i < self.m and j < self.k:
yield (i, j), (v, n)
def reducer2(self, key, values):
v = 0
n = 0
for v, n in values:
v += v
n += n
yield key, v / n
def steps(self):
return [
MRStep(mapper=self.mapper, reducer=self.reducer),
MRStep(mapper=self.mapper2, reducer=self.reducer2)
]
if __name__ == '__main__':
MatrixMultiplication.run()