D KL (P Q) := p i ln p i q i

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1 Cheroff-Bouds 1 The Geeral Boud Let P 1,, m ) ad Q q 1,, q m ) be two dstrbutos o m elemets, e,, q 0, for 1,, m, ad m 1 m 1 q 1 The Kullback-Lebler dvergece or relatve etroy of P ad Q s defed as m D KL P Q) : l q If m 2, e, P, 1 ) ad Q q, 1 q), we also wrte D KL q) The Kullback-Lebler dvergece rovdes a measure of dstace betwee the dstrbutos P ad Q: t reresets the exected loss of effcecy we cur f we ecode a m-letter alhabet wth dstrbuto P wth a code that s otmal for dstrbuto Q We ca ow state the geeral form of the Cheroff-Boud: Theorem 11 Let X 1,, X be deedet radom varables wth X {0, 1} ad Pr[X 1, for 1, Set X : 1 X The, for ay t [0, 1, we have 1 Pr[X + t) e DKL+t ) 2 Three Proofs 21 The Momet Method The usual roof of Theorem 11 uses the exoetal fucto ex ad Markov s equalty It s called momet method because ex smultaeously ecodes all momets of X, e, X, X 2, X 3, etc The roof techque s very geeral ad ca be used to obta several varats of Theorem 11 Let λ > 0 a arameter to be determed later We have From Markov s equalty, we obta Pr[X + t) Pr[λX λ + t) Pr [ e λx e λ+t) Pr [ e λx e λ+t) E[eλX e λ+t) Now, the deedece of the X yelds [ E[e λx E [e λ 1 X E e λx 1 1 E [e λx e λ + 1 ) Thus, Pr[X > + t) e λ + 1 ), 1) e λ+t) 1

2 for every λ > 0 Otmzg for λ usg calculus, we get that the rght had sde s mmzed f Pluggg ths to 1), we get as desred Pr[X > + t) e λ 1 ) + t) 1 t) [ ) +t 1 ) 1 t e DKL+t ), + t 1 t 22 Chvátal s Method Let B, ) the radom varable that gves the umber of heads deedet Beroull trals wth success robablty It s well kow that ) Pr[B, ) l l 1 ) l, l for l 0,, Thus, for ay τ 1 ad k, we get Pr[B, ) k k ) 1 ) ) k 0 k 1 1 ) τ }{{} k Thus, usg the Bomal theorem, we obta ) Pr[B, ) k 1 ) τ k τ k If we wrte k + t) ad τ e λ, we ca coclude Pr[B, ) + t) ) 1 ) τ k } {{ } ) 1 ) τ k )τ) 1 ) τ + 1 ) τ k e λ + 1 e λ+t) ) Ths s the same as 1), so we ca comlete the roof of Theorem 11 as Secto The Imaglazzo-Kabaets Method Let λ [0, 1 be a arameter to be chose later Let I {1,, } be a radom dex set obtaed by cludg each elemet {1,, } wth robablty λ We estmate the robablty Pr [ I X 1 two dfferet ways, where the robablty s over the radom choce of X 1,, X ad I O the oe had, usg the uo boud ad deedece, we have [ [ Pr X 1 Pr I S X 1 Pr[I S Pr[X 1 S I S {1,,} S {1,,} λ S 1 λ) S S S {1,,} s0 S ) λ) s 1 λ) s λ + 1 λ), 2) s 2

3 by the Bomal theorem O the other had, by the law of total robablty, [ [ Pr X 1 Pr X 1 X + t) Pr[X + t) I I Now, fx X 1,, X wth X + t) For the fxed choce of X 1 x 1,, X x, the robablty Pr [ I x 1 s exactly the robablty that I avods all the X dces where x 0 Thus, [ Pr x 1 1 λ) X 1 λ) 1 t) I Sce the boud holds uformly for every choce of x 1,, x wth X + t), we get [ Pr X 1 X + t) 1 λ) 1 t), so Combg wth 2), I [ Pr X 1 1 λ) 1 t) Pr[X + t) I Pr[X + t) ) λ + 1 λ 3) 1 λ) 1 t) Usg calculus, we get that the rght had sde s mmzed for λ t/1 ) + t) ote that λ 1 for t 1 ) Pluggg ths to 3), [ ) +t 1 ) 1 t Pr[X > + t) e DKL+t ), + t 1 t as desred 3 Useful Cosequeces 31 The Lower Tal Corollary 31 Let X 1,, X be deedet radom varables wth X {0, 1} ad Pr[X 1, for 1, Set X : 1 X The, for ay t [0,, we have Proof Pr[X t) e DKL t ) Pr[X t) Pr[ X t) Pr[X 1 + t), where X 1 X wth X {0, 1} deedet radom varables such that Pr[X result follows from D KL 1 + t 1 ) D KL t ) 1 1 The 3

4 32 Motwa-Raghava verso Corollary 32 Let X 1,, X be deedet radom varables wth X {0, 1} ad Pr[X 1, for 1, Set X : 1 X ad µ The, for ay δ 0, we have e δ ) µ Pr[X 1 + δ)µ 1 + δ) 1+δ, ad Pr[X 1 δ)µ e δ 1 δ) 1 δ ) µ Proof Settg t δµ/ Theorem 11 yelds [ 1 Pr[X 1 + δ)µ ex 1 + δ) l1 + δ) + ) 1 δ/1 )) δ 1 )/ µ 1 + δ) 1+δ e δ2 /1 )+δ 1 + δ) 1+δ Settg t δµ/ Corollary 31 yelds Pr[X 1 δ)µ ex ) µ e δ ) µ 1 + δ) 1+δ [ 1 1 δ) l1 δ) δ/1 )) δ 1 )/ 1 δ) 1 δ ) µ e δ2 /1 ) δ 1 δ) 1 δ ) µ e δ 1 δ) 1 δ ) µ ) δ l ) + δ l )) 1 δ 1 )) 1 + δ 1 33 Hady Versos Corollary 33 Let X 1,, X be deedet radom varables wth X {0, 1} ad Pr[X 1, for 1, Set X : 1 X ad µ The, for ay δ 0, 1), we have Proof By Corollary 32 Usg the ower seres exaso of l1 δ), we get Thus, as clamed 1 δ) l1 δ) 1 δ) Pr[X 1 δ)µ e δ2 µ/2 e δ ) µ Pr[X 1 δ)µ 1 δ) 1 δ 1 δ δ + δ 1) δ + δ2 /2 2 Pr[X 1 δ)µ e [ δ+δ δ2 /2µ e δ2 µ/2, 4

5 Corollary 34 Let X 1,, X be deedet radom varables wth X {0, 1} ad Pr[X 1, for 1, Set X : 1 X ad µ The, for ay δ 0, we have Pr[X 1 + δ)µ e m{δ2,δ}µ/4 Proof We may assume that 1 + δ) 1 The Theorem 11 gves Defe fδ) : D KL 1 + δ) ) The ad By Taylor s theorem, we have Pr[X 1 + δ) e DKL1+δ) ) f δ) l1 + δ) l1 δ/1 )) f δ) 1 + δ)1 δ) 1 + δ fδ) f0) + δf 0) + δ2 2 f ξ), for some ξ [0, δ Sce f0) f 0) 0, t follows that fδ) δ2 2 f ξ) δ ξ) δ δ) For δ 1, we have δ/1 + δ) 1/2, for δ < 1, we have 1/δ + 1) 1/2 Ths gves for all δ 0 ad the clam follows fδ) m{δ 2, δ}/4, Corollary 35 Let X 1,, X be deedet radom varables wth X {0, 1} ad Pr[X 1, for 1, Set X : 1 X ad µ The, for ay δ > 0, we have Proof Combe Corollares 33 ad 34 Pr[ X µ δµ 2e m{δ2,δ}µ/4 Corollary 36 Let X 1,, X be deedet radom varables wth X {0, 1} ad Pr[X 1, for 1, Set X : 1 X ad µ For t 2eµ, we have Proof By Corollary 32 Pr[X t 2 t e δ ) µ Pr[X 1 + δ)µ 1 + δ) 1+δ ) 1+δ)µ e 1 + δ For δ 2e 1, the deomator the rght had sde s at least 2e, ad the clam follows 4 Geeralzatos We meto a few geeralzatos of the three roof techques for Secto 2 Sce the cosequeces from Secto 3 are based o smle algebrac maulato of the bouds, they same cosequeces also hold for the geeralzed settgs 5

6 41 Hoeffdg-Exteso Theorem 41 Let X 1,, X be deedet radom varables wth X [0, 1 ad E[X Set X : 1 X ad : 1/) 1 The, for ay t [0, 1, we have Pr[X + t) e DKL+t ) Proof The roof geeralzes the momet method Let λ > 0 a arameter to be determed later As before, Markov s equalty yelds Pr [ e λx e λ+t) E[eλX e λ+t) Usg deedece, we get E[e λx E [e λ 1 X 1 E [e λx 4) Now we eed to estmate E [ e λx The fucto z e λz s covex, so e λz 1 z)e 0 λ + ze 1 λ for z [0, 1 Hece, E [ e λx E[1 X + X e λ 1 + e λ Gog back to 4), E[e λx 1 + e λ ) Usg the arthmetc-geometrc mea equalty 1 x 1/) 1 x ), for x 0, ths s From here we cotue as Secto 21 1 E[e λx 1 + e λ ) 42 Hyergeometrc Dstrbuto Chvátals roof geeralzes to the hyergeometrc dstrbuto Theorem 42 Suose we have a ur wth N balls, P of whch are red We radomly draw balls from the ur wthout relacemet Let HN, P, ) deote the umber of red balls the samle Set : P/N The, for ay t [0, 1, we have Proof It s well kow that for l 0,, Pr[HN, P, ) + t) e DKL+t ) Pr[HN, P, ) l Clam 43 For every {0,, }, we have N ) 1 P P l ) N P ) N l ) ) ) N l ) 1, ) 6

7 Proof Cosder the followg radom exermet: take a radom ermutato of the N balls the ur Let S be the sequece of the frst elemets the ermutato Let X be the umber of -subsets of S that cota oly red balls We comute E[X two dfferet ways O the oe had, E[X ) Pr[S cotas red balls N ) 1 P ) N P ) ) 5) O the other had, let I {1,, } wth I The the robablty that all the balls the ostos dexed by I are red s P N P 1 N 1 P + 1 ) P N + 1 N Thus, by learty of exectato E[X ) Together wth 5), the clam follows Clam 44 For every τ 1, we have N ) 1 0 P Proof Usg Clam 43 ad the Bomal theorem twce), as clamed N ) 1 0 P ) ) N P τ Thus, for ay τ 1 ad k, we get as before Pr[HN, P, ) k N ) 1 k P ) ) N P τ 1 + τ 1)) ) 1 N ) P N P 0 ) 1 N ) ) P N P 0 0 ) 1 N P τ 1) 0 0 ) ) N P ) 1 τ 1)) ) τ 1) ) N P ) τ 1)) 1 + τ 1)), N by Clam 44 For here the roof roceeds as Secto 22 ) 1 0 P ) ) ) N P )τ k τ + 1 ) τ k, 43 Geeral Imaglazzo-Kabaets Theorem 45 Let X 1,, X be radom varables wth X 0, 1 Suose there exst [0, 1, 1,,, such that for every dex set I {1,, }, we have Pr[ I X 1 I Set X : 1 X ad : 1/) 1 The, for ay t [0, 1, we have Pr[X + t) e DKL+t ) 7

8 Proof Let λ [0, 1 be a arameter to be chose later Let I {1,, } be a radom dex set obtaed by cludg each elemet {1,, } wth robablty λ As before, we estmate the robablty Pr [ I X 1 two dfferet ways, where the robablty s over the radom choce of X 1,, X ad I Smlarly to before, [ Pr X 1 Pr I [ I X 1 S {1,,} S {1,,} [ Pr I S X 1 S [ Pr[I S Pr S X 1 S {1,,} λ S 1 λ) S 6) We defe deedet radom varables Z 1,, Z as follows: for 1,,, wth robablty 1 λ, we set Z 1, ad wth robablty λ, we set Z By 6), ad usg deedece ad the arthmetcgeometrc mea equalty [ [ Pr X 1 E Z I 1 E[Z The roof of the lower boud remas uchaged ad yelds [ Pr X 1 1 λ) 1 t) Pr[X + t), I 1 S 1 λ + λ) 1 λ + λ) 7) as before Combg wth 7) ad otmzg for λ fshes the roof, see Secto

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