1,997 research outputs found
Hash Embeddings for Efficient Word Representations
We present hash embeddings, an efficient method for representing words in a
continuous vector form. A hash embedding may be seen as an interpolation
between a standard word embedding and a word embedding created using a random
hash function (the hashing trick). In hash embeddings each token is represented
by -dimensional embeddings vectors and one dimensional weight
vector. The final dimensional representation of the token is the product of
the two. Rather than fitting the embedding vectors for each token these are
selected by the hashing trick from a shared pool of embedding vectors. Our
experiments show that hash embeddings can easily deal with huge vocabularies
consisting of millions of tokens. When using a hash embedding there is no need
to create a dictionary before training nor to perform any kind of vocabulary
pruning after training. We show that models trained using hash embeddings
exhibit at least the same level of performance as models trained using regular
embeddings across a wide range of tasks. Furthermore, the number of parameters
needed by such an embedding is only a fraction of what is required by a regular
embedding. Since standard embeddings and embeddings constructed using the
hashing trick are actually just special cases of a hash embedding, hash
embeddings can be considered an extension and improvement over the existing
regular embedding types
REsCape: an Agent-Based Framework for Modeling Resources, Ethnicity, and Conflict
This research note provides a general introduction to REsCape: an agent-based computational framework for studying the relationship between natural resources, ethnicity, and civil war. By permitting the user to specify: (i) different resource profiles ranging from a purely agrarian economy to one based on the artisanal or industrial extraction of alluvial or kimberlite diamonds; (ii) different patterns of ethnic domination, ethnic polarization, and varying degrees of ethnic salience; as well as (iii) specific modes of play for key agents, the framework can be used to assess the effects of key variables ĂąâŹâ whether taken in isolation or in various combinations ĂąâŹâ on the onset and duration of civil war. Our objective is to make REsCape available as an open source toolkit in the future, one that can be used, modified, and refined by students and scholars of civil war.Agent-Based Model, Ethnicity, Salience, Polarization, Domination, Civil War, Greed, Natural Resources
Concurrent engineering : en mulighet for fritidsbÄtprodusenter og leverandÞrer pÄ SÞrlandet
FritidsbÄtindustrien pÄ SÞrlandet er en industri som har rÞtter tilbake til forrige Ärhundre, og bÊrer preg av Ä vÊre en hÄndverksindustri. Dette betyr at mange av de prosessene som fÞrer til ferdige produkter baserer seg pÄ tradisjonelle metoder, fra produktutviklingen til produksjon og ferdigstillelse. Dette leverer produkter med hÞy kvalitet, noe som er muliggjort av den enorme kunnskapen og erfaringen som hver enkelt arbeider i industrien har. Baksiden med dette er mange prosesser er tidkrevende og dermed kostbare. Svak kommunikasjon, fÄ standardiserte produkter, en utvikling preget av iterasjoner og fÄ samtidige og parallelle prosesser er ogsÄ kjennetegn ved denne industrien. Den opplever ogsÄ i dag en sterk konkurranse fra lavkostland, samt dÄrlige Þkonomiske tider som fÞlger av «finanskrisen». I tidsperioden fra 2006 til 2009 opplevde fritidsbÄtmarkedet over en halvering av bÄde importerte og eksporterte bÄter(Stensvold, 2011).
FritidsbÄtprodusentene og deres leverandÞrer pÄ SÞrlandet sÞker derfor Þkt kunnskap om nye mÄter Ä drive produktutvikling. Hensikten med oppgaven er Ä undersÞke om «concurrent engineering» er en god mulighet for industrien. Metodikken baserer seg pÄ at personer fra ulike funksjonelle avdelinger i bedriften gÄr sammen om Ä utvikle nye produkter og jobber parallelt. Denne metodikken har utviklet seg, og det er derfor interessant Ä undersÞke hvilken mulighet som er den beste for industrien. Dette er gjort ved Ä ta utgangspunkt i et utvalg av bedriftene knyttet til fritidsbÄtindustrien pÄ SÞrlandet. Dette utvalget bestÄr av ERTEC AS, Skibsplast AS og Windy AS. Skibsplast AS produserer fritidsbÄter for allemannseie, mens Windy AS produserer for luksussegmentet. ERTEC AS er en leverandÞr til begge bÄtprodusentene, og leverer blant annet vindskjermer og produkter i syrefast stÄl. Disse bedriftene er med i et forskningsprosjekt i samarbeid med SINTEF, som heter «Industrialisert smÄskalaproduksjon av fritidsbÄter», forkortet ISB. Dette prosjektet tar hÞyde for Ä gjÞre forskning i henhold til bevaringen av den hÄndverksmessige kompetansen, kvaliteten og merkevaren, samtidig som produksjonen industrialiseres. Denne oppgaven bygger delvis videre pÄ denne forskningen, men med «concurrent engineering» som innfallsvinkel
Higher-Page Hodge Theory of Compact Complex Manifolds
The main thrust of this work is to extend some basic results in Hodge Theory
to the higher pages of the Fr\"olicher spectral sequence. For an arbitrary
nonnegative integer , we introduce the class of
page---manifolds by requiring the analogue of the
Hodge decomposition to hold on a compact complex manifold when the usual
Dolbeault cohomology groups are replaced by the
spaces featuring on the -st page of the Fr\"olicher
spectral sequence of . The class of
page---manifolds coincides with the usual class of
-manifolds when but increases as increases. We
give two kinds of applications. On the one hand, we give a purely numerical
characterisation of the page---property in terms of
dimensions of various cohomology vector spaces. On the other hand, we obtain
several classes of examples, including all complex parallelisable nilmanifolds
and certain families of solvmanifolds and abelian nilmanifolds. Further, there
are general results about the behaviour of this new class under standard
constructions like blow-ups and deformations.Comment: The original paper has been expanded and then broken up into several
shorter papers for journal submission purposes. This is the first of the
shorter papers. Theorems 3.1 and 1.3, as well as several new examples, have
been adde
Deformations of higher-page analogues of ââÂŻ -manifolds
We extend the notion of small essential deformations of CalabiâYau complex structures from the case of the Iwasawa manifold, for which they were introduced recently by the first-named author, to the general case of page-1-¿¿¯ -manifolds that were jointly introduced very recently by all three authors. We go on to obtain an analogue of the unobstructedness theorem of Bogomolov, Tian and Todorov for CalabiâYau page-1-¿¿¯ -manifolds. As applications of this discussion, we study the small deformations of certain Nakamura solvmanifolds and reinterpret the cases of the Iwasawa manifold and its 5-dimensional analogue from this standpoint. © 2021, The Author(s)
Improved regularity for the stochastic fast diffusion equation
We prove that the solution to the singular-degenerate stochastic
fast-diffusion equation with parameter , with zero Dirichlet
boundary conditions on a bounded domain in any spatial dimension, and driven by
linear multiplicative Wiener noise, exhibits improved regularity in the Sobolev
space for initial data in .Comment: 7 pages, 29 reference
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