7,521 research outputs found
OBJ2TEXT: Generating Visually Descriptive Language from Object Layouts
Generating captions for images is a task that has recently received
considerable attention. In this work we focus on caption generation for
abstract scenes, or object layouts where the only information provided is a set
of objects and their locations. We propose OBJ2TEXT, a sequence-to-sequence
model that encodes a set of objects and their locations as an input sequence
using an LSTM network, and decodes this representation using an LSTM language
model. We show that our model, despite encoding object layouts as a sequence,
can represent spatial relationships between objects, and generate descriptions
that are globally coherent and semantically relevant. We test our approach in a
task of object-layout captioning by using only object annotations as inputs. We
additionally show that our model, combined with a state-of-the-art object
detector, improves an image captioning model from 0.863 to 0.950 (CIDEr score)
in the test benchmark of the standard MS-COCO Captioning task.Comment: Accepted at EMNLP 201
Time-Reversal Symmetry and Arrow of Time in Quantum Mechanics of Open Systems
It is one of the most important and long-standing issues of physics to derive
the irreversibility out of a time-reversal symmetric equation of motion. The
present paper considers the breaking of the time-reversal symmetry in open
quantum systems and the emergence of an arrow of time. We claim that the
time-reversal symmetric Schr\"{o}dinger equation can have eigenstates that
break the time-reversal symmetry if the system is open in the sense that it has
at least a countably infinite number of states. Such eigenstates, namely the
resonant and anti-resonant states, have complex eigenvalues. We show that,
although these states are often called "unphysical," they observe the
probability conservation in a particular way. We also comment that the
seemingly Hermitian Hamiltonian is non-Hermitian in the functional space of the
resonant and anti-resonant states, and hence there is no contradiction in the
fact that it has complex eigenvalues. We finally show how the existence of the
states that break the time-reversal symmetry affects the quantum dynamics. The
dynamics that starts from a time-reversal symmetric initial state is dominated
by the resonant states for ; this explains the phenomenon of the arrow of
time, in which the decay excels the growth. The time-reversal symmetry holds in
that the dynamics ending at a time-reversal symmetric final state is dominated
by the anti-resonant states for .Comment: 14 pages, 4 figures, published in Entropy Journal Special Issue
"Coherence in Open Quantum Systems
Globalisation: Recent traits and challenges
This special issue gathers together twelve papers that revisit a range of core topics in the field of international economics. These papers were presented at the XIX Conference on International Economics (CIE) held in Vila‐Real (Spain) on 28th–29th June 2018. The Conference was co‐organized by researchers from the Spanish Association of International Economics and Finance (AEEFI) and the Institute of International Economics (IEI). The selected papers are stimulating pieces that shed new light on recent trends in globalization as well as some of the main challenges that need to be faced in the presence of the multiple yield curves that emerged after the credit crunch. The CIE also included two keynote lectures by Laura Alfaro (Harvard Business School) and Gabriel Quirós (IMF) as well as 64 selected contributions
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