File size: 2,675 Bytes
c02f046 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | var redis = require('redis').createClient();
var tfidf = {};
function updateBackground (documentTerms, cb) {
var totalVal = 0;
var keysServiced = 0;
var documentTermsLength = Object.keys(documentTerms).length;
for (var key in documentTerms) {
var value = parseInt(documentTerms[key], 10);
totalVal += value;
(function(key, totalVal) {
redis.get(key, function (err, res) {
var delta = 0;
if(res === null) {
delta = value;
} else {
delta = parseInt(res, 10) + value;
}
redis.set(key, delta, function(err, res) {
if(err) {
// TODO: log error
}
keysServiced++;
if (keysServiced === documentTermsLength) {
redis.get("TOTAL_KEY", function (err, res) {
var totalKeyDelta = 0;
if(res === null || isNaN(res)) {
// key does not exist. set a new key-value pair.
totalKeyDelta = totalVal;
} else {
// key exists. update the value.
totalKeyDelta = parseInt(res, 10) + totalVal;
}
redis.set("TOTAL_KEY", totalKeyDelta, function(err, res) {
if (err) {
// TODO: log error
}
cb(totalKeyDelta, documentTermsLength);
});
});
}
});
});
})(key, totalVal);
}
}
// documentTerms: {term:count, term2:count2, ... }
tfidf.getScoreMap = function (documentTerms, totalTermCount, cb) {
updateBackground(documentTerms, function(backgroundTotal, documentTermsLength) {
var score = {};
var keysServiced = 0;
for (var key in documentTerms) {
(function(key) {
var value = parseInt(documentTerms[key], 10);
redis.get(key, function(err, res) {
score[key] = ((value+1)/(backgroundTotal+20000)) / totalTermCount / parseInt(res, 10);
keysServiced ++;
if (keysServiced === documentTermsLength) {
return cb(score);
}
});
})(key);
}
});
};
exports.getScoreMap = tfidf.getScoreMap;
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