human
!python MRJob_PreprocessGraph.py PageRank-testIndexed.txt --jobconf 'G=11' > PageRank-testIndexed_input.txt

%%writefile MRJob_PageRank.py
#!/usr/bin/env python
from mrjob.job import MRJob
from mrjob.step import MRStep   
from ast import literal_eval
from mrjob.compat import jobconf_from_env

class MRJobPageRank(MRJob):

    
    
    def configure_options(self):
        super(MRJobPageRank, self).configure_options()
        
        self.add_passthrough_option(
                '--iterations',
                dest = 'iterations',
                default = 10,
                type='int',
                help='number of iterations to run')
    

    def steps(self):        
        
        mapper_only = 0
        if mapper_only:
            return [MRStep(mapper = self.mapper)]
        
        return [MRStep(
                mapper = self.mapper_firstiter,
                reducer = self.reducer
                ),
               MRStep(
                reducer = self.reducer_redistr)]+\
                [MRStep(
                mapper = self.mapper,
                reducer = self.reducer
                ),
               MRStep(
                reducer = self.reducer_redistr)]*self.options.iterations
        
    
    def mapper_firstiter(self, _, line):
        line = line.strip().split('\t')
        key = line[0]
        value = literal_eval(line[1])

        PR = value[0]
        edges = value[1]
        
        yield int(key), [None,edges]
        
        destnodes = edges.keys()
        outdeg = len(destnodes)
        
        if outdeg==0:
            yield '*m',[PR]
        
        for node in destnodes:
            yield int(node), [1.0*PR/outdeg]
            

    def mapper(self, key, value):

        PR = value[0]
        edges = value[1]
        
        yield int(key), [None,edges]
        
        destnodes = edges.keys()
        outdeg = len(destnodes)
        
        if outdeg==0:
            yield '*m',[PR]
        
        for node in destnodes:
            yield int(node),...
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Preprocess Indexed Graph