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#!/usr/bin/python2 | |
# Adam Gashlin | |
# compute number of possible canonical Huffman trees | |
from math import log, pow, factorial, ceil | |
from sys import argv | |
def f(n): | |
return sum(map(lambda i: g(n, i), range(2,n+1))) | |
gmemo={} | |
def g(n, m): | |
# successfully reached root | |
if n == 1 and m == 1: return 1 | |
# otherwise odd count is impossible | |
if not m%2 == 0: return 0 | |
# try to memoize | |
if (n,m) in gmemo: return gmemo[(n,m)] | |
# number of parents needed | |
p = m/2 | |
# Try the preceeding row with j = 0 .. n-p leaves | |
result = sum(map(lambda j: g(n-p, j+p), range(0, n-p+1))) | |
gmemo[(n,m)] = result | |
return result | |
# number of unique canonical huffman codes for n symbols | |
# as above but each row is weighted by how many ways symbols could | |
# be chosen for that row | |
def totalf(n): | |
return sum(map(lambda i: totalg(n, i, i, n), range(2,n+1))) | |
tgmemo={} | |
def totalg(n, m, leaves, outofleaves): | |
if n == 1 and m == 1: return 1 | |
if not m%2 == 0: return 0 | |
#print n,m,leaves,outofleaves | |
if (n,m,leaves,outofleaves) in tgmemo: return tgmemo[(n,m,leaves,outofleaves)] | |
p = m/2 | |
result = sum(map(lambda j: totalg(n-p, j+p, j, outofleaves-leaves), range(0, n-p+1))) | |
if result > 0: | |
result = result * choose(outofleaves, leaves) | |
tgmemo[(n,m,leaves,outofleaves)] = result | |
return result | |
def choose(n, k): | |
return factorial(n)/factorial(n-k)/factorial(k) | |
# approximation from Elsholtz, C. and Heuberger, C. and Prodinger, H | |
# "The number of Huffman codes, compact trees, and sums of unit fractions" | |
# http://arxiv.org/abs/1108.5964 | |
def c(n): | |
r = 1.794147187541686 | |
r2 = 1.279549134726681 | |
R = 0.1418532020854094 | |
R2 = 0.0612410410312 | |
return R*pow(r,n+1) + R2*pow(r2,n+1) | |
def cerr(n): | |
r3=1.123 | |
R3=36.6 | |
return R3*pow(r3,n) | |
if len(argv) != 2: | |
print "N?", | |
n = input() | |
else: | |
n = int(argv[1]) | |
print "N="+str(n) | |
fn = f(n) | |
cn = int(c(n-1)) | |
print "tree shapes:", fn | |
#print "approx ", cn, "+/-", int(cerr(n-1)) | |
#print "epsilon", (fn-cn)/cerr(n-1) | |
#print "log", log(fn, 2), log(fn, 2) / n | |
print "log", log(fn, 2), ceil(log(fn, 2)) / n | |
tfn = totalf(n) | |
print "\n", "codes: ", tfn | |
print "log", log(tfn, 2), ceil(log(tfn, 2)) / n | |
# limit ln(0.1418532020854094*1.794147187541686^(n+1)+0.0612410410312*1.279549134726681^(n+1))/ln(2)/n as n->infinity |
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(trusty)agashlin@localhost:~$ time python2 canonical_huffman_counts.py 256 | |
N=256 | |
tree shapes: 13788109316193398760509765175356452504016251802903691504922316058 | |
log 213.066822715 0.8359375 | |
codes: 8285346724771732535579230927811728168225327017722462710912569952590592004664032454495237136142941895785078262147962368331361599881152082917372513656538259471687747109280004266012452128176975946933606710323650083945073453117518096515176061298715602008155503184006958338547855520939548550332963652842058130953747425433798699820856676738318852909858907005439087597925996232864907266148000299240930374128476953278616257986858763338907603637216088492899959322872821380124860154009008128820158384145333423773537835219430522105956061 | |
log 1747.06281189 6.828125 | |
real 5m23.938s | |
user 5m22.288s | |
sys 0m1.141s | |
***** | |
agashlin@agashlin-Precision-T1650:~$ time python2 canonical_huffman_counts.py 512 | |
N=512 | |
tree shapes: 1340202094280772188311632768455468546667114379230305903561172619204126108426146729352116199705307898650585392491893460955175433039 | |
log 428.951174807 0.837890625 | |
codes: 130543968648909935645619978314506199133389373797299014745284479550762983437367255233670435044808313250764359065728423004032004608065848894571505826670455394640991889375619266424991352891302978695197167722798555618281818682649143195543518016390569877640861863370691997318274527421346019417524582433041116809880889867424321364032714685392358083840279608422438782129736413402461432078131916796011704051646947581057820559602866606739572716814208850992558031818839338767623079029478288336120632105792973738976049157860130308187265646400436875151268213443781443429318309937159695295759628843440630582763886541058420747630453605779123282347762718429054014361763661102786229823648838163279876939286908648487229588663143124088346153807532756358016401266132533275456707353151330540453873220380156888184091463890300550149118134624197363284659411757055713475994372095563294899007800565676564125605634696829100406156111640743521926330801210206403996024353699141629507520060375828938630983225821686266007354728273606402342314349822772687935604830298698945257709936417451477065873892367680407801897779441138214105776416739701786498391289198673549465505266647144341576153308420550328474567606268110378607529487122195295965 | |
log 4003.30789014 7.8203125 | |
real 21m50.118s | |
user 21m35.738s | |
sys 0m12.831s | |
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Bits per symbol for tree shape and symbol length, generated by the PARI program | |
f(n)={my(M); if(n>1, M=matrix(n, n); M[2, 1] = 1; for(k=3, n, for(l=1, k-2, M[k, l] = 0; smx = min(2*l, k-l-1); for(s=1, smx, M[k, l] += binomial(k+l-1, 2*l-s)*M[k-l, s])); M[k, k-1] = 1); M[n, 1], 1)} | |
from | |
https://oeis.org/A007178 | |
using | |
log(f(n))/log(2)/n | |
2 0.E-38 | |
3 0.52832083357371872715124631464927216959 | |
4 0.92510992953527304009920316356417368341 | |
5 1.2457637380991761754388755605853193721 | |
6 1.5060289354255808307727245200264046115 | |
7 1.7265434828968693605853334847482784542 | |
8 1.9164914520228209107566102141912770530 | |
9 2.0836250720759120139542034095113382346 | |
10 2.2326599826685215080710971565829405663 | |
11 2.3672027476998588383456295230261167467 | |
12 2.4898160122666358680078862023210117594 | |
13 2.6024722090051311199227104042881213214 | |
14 2.7066802617183810840531621619925665327 | |
15 2.8036352190679852998219391203660304857 | |
16 2.8942924836121595260854783884678139337 | |
17 2.9794304422204135869251441471335531066 | |
18 3.0596904802907368497499321475523973205 | |
19 3.1356078394871863409008875967173986922 | |
20 3.2076336576195233011506616103465012206 | |
21 3.2761518376411853299566964211879428845 | |
22 3.3414917818686202654551133948847671185 | |
23 3.4039382912461329159651573288617929325 | |
24 3.4637392928075207199737841185321285864 | |
25 3.5211119681597462477165093021986236891 | |
26 3.5762476535688512139407970267758657750 | |
27 3.6293158004309365053626744991488107986 | |
28 3.6804672026732631347160559532409799401 | |
29 3.7298366491205211606863386350621527077 | |
30 3.7775451193919761986199602575848753728 | |
31 3.8237016147639467601216515732013330279 | |
32 3.8684046945406066818789240637660185499 | |
33 3.9117437731334239933560128378031791271 | |
34 3.9538002212942542485845641054535987773 | |
35 3.9946483060179710050654663197327435291 | |
36 4.0343559967202001529635998891505609516 | |
37 4.0729856599326350078321333114687250635 | |
38 4.1105946605514163109395879910090973922 | |
39 4.1472358843550403322487801968073071530 | |
40 4.1829581938694850805546603519806231419 | |
41 4.2178068275475861986341918945142290309 | |
42 4.2518237505306594590993079793997345509 | |
43 4.2850479638848848644058485858979470688 | |
44 4.3175157780852015495325142671947591136 | |
45 4.3492610556031277522668215976786190509 | |
46 4.3803154267013116673151455816844696667 | |
47 4.4107084819149095353755146904142901427 | |
48 4.4404679441830163716761777900058696594 | |
49 4.4696198231625088469860112038284600644 | |
50 4.4981885538960125780907846201523369606 | |
51 4.5261971217026492562035177654875012411 | |
52 4.5536671749046000172482401639586024054 | |
53 4.5806191267861396538651659570547959107 | |
54 4.6070722479979976745520565206520375779 | |
55 4.6330447504632643579100075842100245597 | |
56 4.6585538637071455396129840632629051540 | |
57 4.6836159044180333111435264851185402700 | |
58 4.7082463399485944469276613029732698694 | |
59 4.7324598463803953621613869552719305371 | |
60 4.7562703617019142024839327246189232472 | |
61 4.7796911345859138641461654397871279193 | |
62 4.8027347691966230359375708850453455975 | |
63 4.8254132664087865399227915897218071133 | |
64 4.8477380617783837396456637998955019842 | |
65 4.8697200605678157103193747582280274383 | |
66 4.8913696700959012414422961694077059239 | |
67 4.9126968296544815178472854516221261332 | |
68 4.9337110382082883592961452704996589139 | |
69 4.9544213800725331132500599926169992546 | |
70 4.9748365487430394085438731731790639688 | |
71 4.9949648690363443378599451435717464796 | |
72 5.0148143176817467733275207525437377772 | |
73 5.0343925424935450991518469364337701000 | |
74 5.0537068802394695857918039537759160913 | |
75 5.0727643733103951673925994914037176155 | |
76 5.0915717852866609260118280713293946314 | |
77 5.1101356154875862216779549474345767322 | |
78 5.1284621125829409582014913565851654742 | |
79 5.1465572873380949999089542162593439241 | |
80 5.1644269245582484333667719763696947572 | |
81 5.1820765942914507002940854698000394303 | |
82 5.1995116623449828993372095899960148315 | |
83 5.2167373001650425280804235021874311519 | |
84 5.2337584941254797315266097591665059211 | |
85 5.2505800542675412533296938711291071616 | |
86 5.2672066225291408348903779248832490309 | |
87 5.2836426804990557176024183729661105671 | |
88 5.2998925567286153638212971383724496629 | |
89 5.3159604336308714280887956865887396082 | |
90 5.3318503539948915459927222422456956313 | |
91 5.3475662271406806894049249722266505874 | |
92 5.3631118347382822058348555390089243510 | |
93 5.3784908363128279747928060333044411874 | |
94 5.3937067744556770888996400092262252444 | |
95 5.4087630797602905423883619869741833135 | |
96 5.4236630755001225524688803829587087662 | |
97 5.4384099820645556705721971624573583897 | |
98 5.4530069211677562815209331883932592190 | |
99 5.4674569198442700256244715400926645152 | |
100 5.4817629142442046456122771040140686404 | |
101 5.4959277532399531349214233523645658560 | |
102 5.5099542018555859759356465942927905079 | |
103 5.5238449445292815073316622767550991710 | |
104 5.5376025882184624494636770791790117511 | |
105 5.5512296653566592829490745999993171233 | |
106 5.5647286366705229360150754725768021358 | |
107 5.5781018938648559391974484794624923539 | |
108 5.5913517621830190867328943815650758177 | |
109 5.6044805028495962849017960466642559236 | |
110 5.6174903154017605635184530967029502989 | |
111 5.6303833399153763538649168723747061028 | |
112 5.6431616591314945242420726002279626355 | |
113 5.6558273004885449712574784550099187072 | |
114 5.6683822380652046557544448496288043718 | |
115 5.6808283944386148983029179965742966034 | |
116 5.6931676424623387306398252759084526729 | |
117 5.7054018069681855094546018087371050271 | |
118 5.7175326663957843490988153188888318676 | |
119 5.7295619543535588574623582523666628113 | |
120 5.7414913611145419158000756623314880470 | |
121 5.7533225350502696837774561541151953628 | |
122 5.7650570840058075847722031634887898630 | |
123 5.7766965766187867686625437826976551078 | |
124 5.7882425435851665732497048221427066363 | |
125 5.7996964788742859956419099624709782712 | |
126 5.8110598408956243909067665205453034788 | |
127 5.8223340536195578459543068862654994627 | |
128 5.8335205076542722950379794033627103319 | |
129 5.8446205612808768621229739014693899004 | |
130 5.8556355414486505926984242649846605601 | |
131 5.8665667447322521729654743376096975493 | |
132 5.8774154382526249653393532522140339332 | |
133 5.8881828605632382883811617075721777080 | |
134 5.8988702225032199411663296506759398732 | |
135 5.9094787080188541506458081372342020257 | |
136 5.9200094749548430667213423059715894748 | |
137 5.9304636558166583293325736810769520880 | |
138 5.9408423585052417934853251490605899432 | |
139 5.9511466670252509515153164954546045148 | |
140 5.9613776421679846860328976477829981379 | |
141 5.9715363221700684888432241805851538299 | |
142 5.9816237233489249740631390516115577917 | |
143 5.9916408407160051962393448259058194746 | |
144 6.0015886485687087691235984518551132545 | |
145 6.0114681010618758934555355785928425817 | |
146 6.0212801327596919802026100351974692231 | |
147 6.0310256591688054478543070189928603773 | |
148 6.0407055772534213374669278719207577143 | |
149 6.0503207659330974956065874802758593350 | |
150 6.0598720865639361003416020095915875236 | |
151 6.0693603834038311343473350450193215583 | |
152 6.0787864840624019349270098703653478979 | |
153 6.0881511999362140732596825703852771805 | |
154 6.0974553266298614409158256799195683321 | |
155 6.1066996443634574631379224955547545710 | |
156 6.1158849183670587336980315864352561571 | |
157 6.1250118992625209986749513202986630822 | |
158 6.1340813234332652344623989411616439756 | |
159 6.1430939133824105014745782310738122204 | |
160 6.1520503780797102463187040452808376499 | |
161 6.1609514132977097125428146203791118907 | |
162 6.1697977019375240479868672761205973530 | |
163 6.1785899143446195132214764955708065290 | |
164 6.1873287086149638516886038363431272176 | |
165 6.1960147308918963320673869070008748732 | |
166 6.2046486156540531739526678091402069651 | |
167 6.2132309859946699786184345248117767926 | |
168 6.2217624538925693693264206129729456097 | |
169 6.2302436204751292644751282684182055779 | |
170 6.2386750762735150281240320698687354585 | |
171 6.2470574014704471343067300483227835447 | |
172 6.2553911661407649141511591219672822345 | |
173 6.2636769304850363999733245499027812064 | |
174 6.2719152450564542116449600487153186249 | |
175 6.2801066509812478226175431184421973866 | |
176 6.2882516801728333724030329423228342407 | |
177 6.2963508555399134367901657220305510557 | |
178 6.3044046911887308055926292248306522664 | |
179 6.3124136926196723304371175125480556878 | |
180 6.3203783569184112732649234507677526782 | |
181 6.3282991729417692921374816471044979730 | |
182 6.3361766214984722278757546657808304913 | |
183 6.3440111755249671872129927836817087003 | |
184 6.3518033002564620405485663952859991944 | |
185 6.3595534533933423509152904292672157200 | |
186 6.3672620852631149120336181775928320961 | |
187 6.3749296389780214846597368939278687591 | |
188 6.3825565505884609698521595691140988945 | |
189 6.3901432492323531339294898106731976892 | |
190 6.3976901572805720920157989586544162032 | |
191 6.4051976904785730549786647589743415056 | |
192 6.4126662580843313385991827967851850773 | |
193 6.4200962630027083148152579825611251439 | |
194 6.4274881019163548441640999929787966245 | |
195 6.4348421654132587578780546602066099350 | |
196 6.4421588381110391496416785022931688250 | |
197 6.4494384987780865833767369390518065121 | |
198 6.4566815204516448175403454899117969678 | |
199 6.4638882705529262816090980426003795649 | |
200 6.4710591109993503103230776920558140226 | |
201 6.4781943983139900398391191215850095964 | |
202 6.4852944837323108914529653050830976689 | |
203 6.4923597133062807075385474056322858890 | |
204 6.4993904280059288556308692028079448386 | |
205 6.5063869638184289752116975472416660328 | |
206 6.5133496518447775030491420343334002211 | |
207 6.5202788183941376724250689578717257883 | |
208 6.5271747850759163350050503654250597292 | |
209 6.5340378688896386974148696055155671857 | |
210 6.5408683823126838939292293538958622384 | |
211 6.5476666333859422283789642913430305670 | |
212 6.5544329257974529089429558139935284341 | |
213 6.5611675589640791655747958092812693002 | |
214 6.5678708281112757782428060494685764339 | |
215 6.5745430243510022519040899754927502568 | |
216 6.5811844347578331482981710677661724328 | |
217 6.5877953424433154224761172010534982557 | |
218 6.5943760266286210108461495803027085216 | |
219 6.6009267627155413749061312954009434084 | |
220 6.6074478223558692183508037511078649106 | |
221 6.6139394735192111625995117329570401366 | |
222 6.6204019805592737848039100233323214097 | |
223 6.6268356042786640909783195852768455589 | |
224 6.6332406019922442130547840442351646482 | |
225 6.6396172275890788804959294743567101570 | |
226 6.6459657315930130227812702031895984993 | |
227 6.6522863612219157068767116441220036528 | |
228 6.6585793604456255020391455730581489951 | |
229 6.6648449700426312914073941821623863105 | |
230 6.6710834276555215142657483672328131082 | |
231 6.6772949678452338231813055621045928395 | |
232 6.6834798221441361750183868415754199201 | |
233 6.6896382191079694427894789356105446860 | |
234 6.6957703843666807351363985966415287621 | |
235 6.7018765406741757407260544292448776797 | |
236 6.7079569079570175748224346901660472403 | |
237 6.7140117033620987936398312288598506728 | |
238 6.7200411413033124577184891833719972074 | |
239 6.7260454335072473674644649968514724236 | |
240 6.7320247890579318611749815903985316945 | |
241 6.7379794144406498573844137083839760218 | |
242 6.7439095135848521383087058631764392476 | |
243 6.7498152879061852086693000110417525565 | |
244 6.7556969363476594234089200572985229404 | |
245 6.7615546554199774579722250657938822042 | |
246 6.7673886392410435951482895953076437235 | |
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