52,451 research outputs found
Suboptimal Choice Behaviour across Different Reinforcement Probabilities
Six adult roostersâ choice behaviour was investigated across a series of five experimental conditions and a series of replication of the same five experimental conditions. Stagner and Zentall (2010) found that pigeons prefer to choose an alternative with highly reliable discriminative stimuli but with less food reward over an alternative with non-discriminative stimuli but with more food reward. The current research systematically changed the probability of reinforcement associated with the discriminative stimulus through a series of experimental conditions. Experimental sessions were completed with six adult roosters. The experimental procedure was based on Stagner and Zentallâs (2010) experiment in which the suboptimal alternative with discriminative stimuli was associated with 100% reinforcement on 20% of the trials, and non-reinforcement on 80% of the trials; the optimal alternative with non-discriminative stimuli was associated with both 50% reinforcement on all trials. This research modified the probabilities of reinforcement associated with the discriminative alternative. In the first experimental condition, the probability of getting access to reinforcement was the same (50%) for each discriminative stimulus, thus, what was seen for the first time was that both alternatives were associated with non-discriminative stimuli. To insure reliability, a replication of the conditions was done after the first five experimental conditions were completed. The results showed that four of the roosters had suboptimal choice behaviour in the first five experimental conditions; however, only two of them maintained such suboptimal behaviour in the replication conditions. This result does not support the idea that the suboptimal choice behaviour with strong discriminative stimuli is a robust effect
Document Clustering Based On Max-Correntropy Non-Negative Matrix Factorization
Nonnegative matrix factorization (NMF) has been successfully applied to many
areas for classification and clustering. Commonly-used NMF algorithms mainly
target on minimizing the distance or Kullback-Leibler (KL) divergence,
which may not be suitable for nonlinear case. In this paper, we propose a new
decomposition method by maximizing the correntropy between the original and the
product of two low-rank matrices for document clustering. This method also
allows us to learn the new basis vectors of the semantic feature space from the
data. To our knowledge, we haven't seen any work has been done by maximizing
correntropy in NMF to cluster high dimensional document data. Our experiment
results show the supremacy of our proposed method over other variants of NMF
algorithm on Reuters21578 and TDT2 databasets.Comment: International Conference of Machine Learning and Cybernetics (ICMLC)
201
Gauge-Fixed Wannier Wave-Functions for Fractional Topological Insulators
We propose an improved scheme to construct many-body trial wave functions for
fractional Chern insulators (FCI), using one-dimensional localized Wannier
basis. The procedure borrows from the original scheme on a continuum cylinder,
but is adapted to finite-size lattice systems with periodic boundaries. It
fixes several issues of the continuum description that made the overlap with
the exact ground states insignificant. The constructed lattice states are
translationally invariant, and have the correct degeneracy as well as the
correct relative and total momenta. Our prescription preserves the (possible)
inversion symmetry of the lattice model, and is isotropic in the limit of flat
Berry curvature. By relaxing the maximally localized hybrid Wannier orbital
prescription, we can form an orthonormal basis of states which, upon gauge
fixing, can be used in lieu of the Landau orbitals. We find that the exact
ground states of several known FCI models at nu=1/3 filling are well captured
by the lattice states constructed from the Laughlin wave function. The overlap
is higher than 0.99 in some models when the Hilbert space dimension is as large
as 3x10^4 in each total momentum sector.Comment: 36 pages, 13 figure
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