def run(self):
with self.input()[0] as i:
coll = i.collection
map = Code("""
function(){
emit(this.node, 1);
}
""")
reduce = Code("""
function(key, values){
var total = 0;
for(var i = 0; i < values.length; i++){
total += values[i];
}
return total;
}
""")
reduce = coll.map_reduce(map, reduce, self.collection.value)
all = len(self.graphs)
reduce.update({}, {'$mul': {'value': 1 / all}})
