CIKM 2016

1. Why Did You Cover That Song?:
Modeling N-th Order Derivative Creation with Content Popularity
Kosetsu Tsukuda, Masahiro Hamasaki, Masataka Goto National Institute of Advanced Industrial Science and Technology (AIST)
Estimate Factors That Trigger N-th Order Derivative Creation
Contributions
Modeled n-th order derivative creation as a function of original work attractiveness, original work popularity, and derivative work popularity.
Quantitatively evaluated our model using music content dataset and showed the model adopting all three factors achieved the best result.
Qualitatively evaluated our model in terms of category characteristics, temporal development of factors, and creator characteristics.
Sing Dance Play
Oatt 14.6 17.3 42.5
Opop 40.0 21.7 40.0
Dpop 45.4 61.0 17.5
0
20
40
60
80
100
120
Apr-10 Oct-10 Apr-11 Oct-11 Apr-12 Oct-12
0
5
10
15
20
25
Nov-10 May-11 Nov-11 May-12 Nov-12
0
5
10
15
20
25
Jul-10 Jan-11 Jul-11 Jan-12 Jul-12 Jan-132010/4 2010/10 2011/4 2011/10 2012/4 2012/10 2010/11 2011/5 2011/11 2012/5 2012/11 2010/7 2011/1 2011/7 2012/1 2012/7 2013/1
Result 1: category characteristics
Result 2: temporal development of factors
Result 3: creator characteristics : creator
Factor 1 Factor 2 Factor 3
Original work’s attractiveness (Oatt) Original work’s popularity (Opop) Derivative work’s popularity (Dpop)
Original song
I cover this song because
I like the melody!
１ Hatsune Miku
Senbon Zakura
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２ GUMI
Yakusoku no tane
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３ GUMI
Dystopia･Zipangu
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Original song rankingIf I cover this popular
original song, my cover
video might also
become popular!
１
２
３
Gurutamin
Senbon Zakura
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Shamuon/Amatsuki
Panda Hero
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Cover song ranking
Mitani Nana
Senbon Zakura
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Other derivatives of
this work are popular,
so I would also like to
create one!
0 T
Rate
Rate at which creator posts a derivative work at time :
- is the original work’s attractiveness,
- is the probability that is influenced by Oatt,
- assumed to be constant in time.
0 T
Rate
Rate at which creator posts a derivative work at time :
- is the rank of the original work in the ranking,
- is the influence of original work’s popularity,
- is the probability that is influenced by Opop.
, , ,
Rate at which creator posts a derivative work at time :
- is the rank of the derivative work in the ranking,
- is the influence of derivative work’s popularity,
- is the probability that is influenced by Dpop.
0 TRate
, , ,
0
Marginalized joint distribution of and
, !|#, $, %, &, ', (
* , !|#, $, +, ,, -, ., % +|', ( ,|', ( -|', ( .|& /+/,/-/.
Sample 012 in the E-step of a stochastic EM procedure
3| , !∖ , #, $, %, &, ', ( ∝
, !∖ , 3|#, $, %, &, ', (
∖ , !∖ |#, $, %, &, ', (
: set of derivative work posting events of
all original works;
!: set of latent variables of all derivative
works of all original works;
Assume a Gamma prior for , , and ,
and a Dirichlet prior for 6 .
1
2
3 4 5 6 7
Sing: creators tend to follow fads and put a high priority on content popularity.
Dance: the ratio of Dpop is high because many creators imitate the choreography
proposed in a derivative work.
Play: creators play their favorite original songs without being affected by fads.
#ofderivativeworks
Derivative works of an original song in the “sing” category. Derivative works of an original song in the “dance” category. Derivative works of an original song in the “play” category.
For a creator in circle A, recommend original works similar to
the original works he/she used in the past.
For a creator in circle B, recommend original works because
he/she can compose original choreography.
For a creator in circle C, recommend popular content in the
derivative work ranking.
These days amateur creators who used
to be just consumers can also easily
create content (a.k.a. user generated
content). Since not all amateur creators
can create new content from scratch,
it is popular to use existing original
(1st generation) work as the basis for
new content: such content is called
derivative work.
Niconico Thingiverse
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sm17483164 sm16309076sm18407945 thing:1541729thing:1481404
Sing Dance Play Resize drawers Add partitions
In this kind of derivative work
creation activity, a creator
influenced by 2nd gen content
can create 3rd gen content.
Similarly, Nth gen content
can be transformed into N+1th
gen content. Such derivative
work creation activity is called
N-th order derivative creation.
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1st generation
2nd generation
3rd generation
Original song Original accessory case
(%)
Oatt Opop Dpop
Oatt
Sing
A
Opop Dpop
B
Oatt
Opop Dpop
Dance
C
Oatt
Opop Dpop
Play