Add differential privacy to the pipeline.

differential_privacy_beam/main.go

@@ -6,6 +6,7 @@ import (
 	"context"
 	"flag"
 	"fmt"
+	"math"
 	"reflect"
 	"strings"
 
@@ -14,18 +15,26 @@ import (
 	"github.com/apache/beam/sdks/go/pkg/beam/io/textio"
 	"github.com/apache/beam/sdks/go/pkg/beam/log"
 	"github.com/apache/beam/sdks/go/pkg/beam/options/gcpopts"
-	"github.com/apache/beam/sdks/go/pkg/beam/transforms/stats"
 	"github.com/apache/beam/sdks/go/pkg/beam/x/beamx"
+	"github.com/google/differential-privacy/privacy-on-beam/pbeam"
 )
 
 // CommentRow models 1 row of HackerNews comments.
 type CommentRow struct {
-	Text string `bigquery:"text"`
+	Author string `bigquery:"author"`
+	Text   string `bigquery:"text"`
 }
 
-const query = `SELECT text
+// AuthorNgram represents an ngram and it's author.
+type AuthorNgram struct {
+	Author string
+	Ngram  string
+}
+
+const query = `SELECT author, text
 FROM ` + "`bigquery-public-data.hacker_news.comments`" + `
 WHERE time_ts BETWEEN '2013-01-01' AND '2014-01-01'
+AND author IS NOT NULL AND text IS NOT NULL
 LIMIT 1000
 `
 
@@ -59,21 +68,50 @@ func main() {
 		reflect.TypeOf(CommentRow{}), bigqueryio.UseStandardSQL())
 
 	// Extract unigrams, bigrams, and trigrams from each comment.
-	// Builds a PCollection<string> where each string is a single
-	// occurrence of an ngram.
-	ngrams := beam.ParDo(s, func(row CommentRow, emit func(string)) {
+	// Builds a PCollection<AuthorNgram> to keep track of the author
+	// of each Ngram. We need an identifier for a user to use
+	// differential privacy.
+	authorNgrams := beam.ParDo(s, func(row CommentRow, emit func(AuthorNgram)) {
 		for _, gram := range ngram(row.Text, 1, 2, 3) {
-			emit(gram)
+			emit(AuthorNgram{Author: row.Author, Ngram: gram})
 		}
 	}, rows)
 
+	// Configure differential privacy parameters.
+	epsilon := float64(4)   // ε = 4
+	delta := math.Pow10(-4) // Δ = 1e-4.
+	spec := pbeam.NewPrivacySpec(epsilon, delta)
+
+	// Convert PCollection<AuthorNgram> to PrivatePcollection<AuthorNgram>.
+	// This PrivatePCollection tracks the "Author" field in our AuthorNgram struct
+	// as the user id when applying differential privacy.
+	pgrams := pbeam.MakePrivateFromStruct(s, authorNgrams, spec, "Author")
+
+	// Convert a PrivatePCollection<AuthorNgram> to a PrivatePCollection<string>,
+	// where the string represents each ngram. This method discards the
+	// Author item from our struct so we can count it like normal.
+	// Internally, the PrivatePCollection keeps track of this identifier.
+	ngrams := pbeam.ParDo(s, func(row AuthorNgram, emit func(string)) {
+		emit(row.Ngram)
+	}, pgrams)
+
 	// Count the occurrence of each ngram.
 	// Returns a PCollection<{string, count: int}>.
-	counts := stats.Count(s, ngrams)
+	counts := pbeam.Count(s, ngrams, pbeam.CountParams{
+		// MaxPartitionsContributed is the max number of distinct ngrams a user
+		// can contribute to. If a user contributes more than this number of
+		// unique ngrams some will be randomly dropped.
+		MaxPartitionsContributed: 700,
+		// MaxValue is the number of times a user may contribute
+		// to the same ngram. If a user contributes more than this
+		// amount to the same ngram, additional contributions will
+		// be dropped.
+		MaxValue: 2,
+	})
 
 	// Convert each count row into a string suitable for printing.
 	// Returns a PCollection<string>.
-	formatted := beam.ParDo(s, func(gram string, c int) string {
+	formatted := beam.ParDo(s, func(gram string, c int64) string {
 		return fmt.Sprintf("%s,%v", gram, c)
 	}, counts)
 

go.mod

@@ -6,7 +6,10 @@ require (
 	cloud.google.com/go/bigquery v1.13.0 // indirect
 	cloud.google.com/go/storage v1.12.0 // indirect
 	github.com/apache/beam v2.25.0+incompatible
+	github.com/google/differential-privacy/go v0.0.0-20201123150640-f9fa472a4655 // indirect
+	github.com/google/differential-privacy/privacy-on-beam v0.0.0-20201123150640-f9fa472a4655
 	golang.org/x/oauth2 v0.0.0-20201109201403-9fd604954f58 // indirect
+	gonum.org/v1/plot v0.7.0 // indirect
 	google.golang.org/api v0.35.0 // indirect
 	google.golang.org/grpc v1.33.2 // indirect
 )

go.sum

@@ -39,6 +39,13 @@ cloud.google.com/go/storage v1.12.0/go.mod h1:fFLk2dp2oAhDz8QFKwqrjdJvxSp/W2g7ni
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
+github.com/ajstarks/svgo v0.0.0-20180226025133-644b8db467af/go.mod h1:K08gAheRH3/J6wwsYMMT4xOr94bZjxIelGM0+d/wbFw=
+github.com/apache/beam v2.2.1-0.20201106205720-59c9aa7837bb+incompatible h1:IXSCXyj5anFjqM77jupUl1YcO9et1Un1JznAOg98Cu8=
+github.com/apache/beam v2.2.1-0.20201106205720-59c9aa7837bb+incompatible/go.mod h1:/8NX3Qi8vGstDLLaeaU7+lzVEu/ACaQhYjeefzQ0y1o=
+github.com/apache/beam v2.2.1-0.20201127131704-372a4f373aff+incompatible h1:A94UKdEk8HUIGhPw1Y8BvxG/GkmGQc492BPkQEHYGBo=
+github.com/apache/beam v2.2.1-0.20201127131704-372a4f373aff+incompatible/go.mod h1:/8NX3Qi8vGstDLLaeaU7+lzVEu/ACaQhYjeefzQ0y1o=
+github.com/apache/beam v2.22.0+incompatible h1:SsORSlJF1b7rY4//RIXz2XbExy9O28O/h35Arj2b1sU=
+github.com/apache/beam v2.22.0+incompatible/go.mod h1:/8NX3Qi8vGstDLLaeaU7+lzVEu/ACaQhYjeefzQ0y1o=
 github.com/apache/beam v2.25.0+incompatible h1:Y8Q9pZ9V8IKM8EDNOE314D6cJE0neJooK+MxBvCcs1M=
 github.com/apache/beam v2.25.0+incompatible/go.mod h1:/8NX3Qi8vGstDLLaeaU7+lzVEu/ACaQhYjeefzQ0y1o=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
@@ -52,9 +59,12 @@ github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymF
 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
+github.com/fogleman/gg v1.2.1-0.20190220221249-0403632d5b90/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k=
+github.com/fogleman/gg v1.3.0/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k=
 github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
 github.com/golang/groupcache v0.0.0-20191227052852-215e87163ea7/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
@@ -82,11 +92,19 @@ github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw
 github.com/golang/protobuf v1.4.3/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
 github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
 github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
+github.com/google/differential-privacy v0.0.0-20201123150640-f9fa472a4655 h1:3xbOXUn1tmrnPou6T6abT/J3mTAJSHFOcqV3Fd7NwvY=
+github.com/google/differential-privacy v0.0.0-20201130131303-5b16577a4578 h1:QHdNGMvcwYNSXAieeavTc9UsmxmTV2beKaIz5U5NNl8=
+github.com/google/differential-privacy/go v0.0.0-20201123150640-f9fa472a4655 h1:IA3NDYY3XcgVhdokh1qHw+BsxPMCKv6mp25eFjgoTsA=
+github.com/google/differential-privacy/go v0.0.0-20201123150640-f9fa472a4655/go.mod h1:zSUrLhD5jc5Oy+doFdTfDZYia6Ibq29oRykm3l6u62g=
+github.com/google/differential-privacy/privacy-on-beam v0.0.0-20201123150640-f9fa472a4655 h1:TyfmZDgFKhTzcGVTuUxLSFqomvbwHMfRKjkGDe3z/sU=
+github.com/google/differential-privacy/privacy-on-beam v0.0.0-20201123150640-f9fa472a4655/go.mod h1:tpE0VAFScoHKWFvxOzi/+8yZAFV8joVt3J6HLEyAjgQ=
+github.com/google/differential-privacy/privacy-on-beam v0.0.0-20201130131303-5b16577a4578 h1:u4C8ojGPcuDcDyOGIpEZw1Z1/yoNd3MCagWT1LDqYTk=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.4.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.4.2-0.20200609072101-23a2b5646fe0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
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 github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
@@ -107,12 +125,14 @@ github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm4
 github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
 github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5mhpdKc/us6bOk=
+github.com/grd/stat v0.0.0-20130623202159-138af3fd5012/go.mod h1:hHyH5N67TF4tD4PBbqMlyuIu5Lq5QwKSgNyyG31trzY=
 github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
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 github.com/ianlancetaylor/demangle v0.0.0-20181102032728-5e5cf60278f6/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
 github.com/ianlancetaylor/demangle v0.0.0-20200824232613-28f6c0f3b639/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
 github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1:6v2b51hI/fHJwM22ozAgKL4VKDeJcHhJFhtBdhmNjmU=
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+github.com/jung-kurt/gofpdf v1.0.3-0.20190309125859-24315acbbda5/go.mod h1:7Id9E/uU8ce6rXgefFLlgrJj/GYY22cpxn+r32jIOes=
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@@ -137,7 +157,10 @@ golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8U
 golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/exp v0.0.0-20180321215751-8460e604b9de/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
+golang.org/x/exp v0.0.0-20180807140117-3d87b88a115f/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
+golang.org/x/exp v0.0.0-20190125153040-c74c464bbbf2/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8=
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@@ -147,6 +170,7 @@ golang.org/x/exp v0.0.0-20191227195350-da58074b4299/go.mod h1:2RIsYlXP63K8oxa1u0
 golang.org/x/exp v0.0.0-20200119233911-0405dc783f0a/go.mod h1:2RIsYlXP63K8oxa1u096TMicItID8zy7Y6sNkU49FU4=
 golang.org/x/exp v0.0.0-20200207192155-f17229e696bd/go.mod h1:J/WKrq2StrnmMY6+EHIKF9dgMWnmCNThgcyBT1FY9mM=
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+golang.org/x/image v0.0.0-20180708004352-c73c2afc3b81/go.mod h1:ux5Hcp/YLpHSI86hEcLt0YII63i6oz57MZXIpbrjZUs=
 golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
 golang.org/x/image v0.0.0-20190802002840-cff245a6509b/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
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@@ -250,8 +274,10 @@ golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
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 golang.org/x/time v0.0.0-20191024005414-555d28b269f0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
+golang.org/x/tools v0.0.0-20180525024113-a5b4c53f6e8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
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+golang.org/x/tools v0.0.0-20190206041539-40960b6deb8e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
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 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
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@@ -301,6 +327,11 @@ golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8T
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+gonum.org/v1/gonum v0.0.0-20180816165407-929014505bf4/go.mod h1:Y+Yx5eoAFn32cQvJDxZx5Dpnq+c3wtXuadVZAcxbbBo=
+gonum.org/v1/gonum v0.7.0/go.mod h1:L02bwd0sqlsvRv41G7wGWFCsVNZFv/k1xzGIxeANHGM=
+gonum.org/v1/netlib v0.0.0-20190313105609-8cb42192e0e0/go.mod h1:wa6Ws7BG/ESfp6dHfk7C6KdzKA7wR7u/rKwOGE66zvw=
+gonum.org/v1/plot v0.0.0-20190515093506-e2840ee46a6b/go.mod h1:Wt8AAjI+ypCyYX3nZBvf6cAIx93T+c/OS2HFAYskSZc=
+gonum.org/v1/plot v0.7.0/go.mod h1:2wtU6YrrdQAhAF9+MTd5tOQjrov/zF70b1i99Npjvgo=
 google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
 google.golang.org/api v0.7.0/go.mod h1:WtwebWUNSVBH/HAw79HIFXZNqEvBhG+Ra+ax0hx3E3M=
 google.golang.org/api v0.8.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
@@ -390,6 +421,7 @@ google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
+google.golang.org/protobuf v1.24.1-0.20200612063355-beaa55256c57/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
@@ -403,5 +435,6 @@ honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt
 honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=