51,824 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
Bloch Model Wavefunctions and Pseudopotentials for All Fractional Chern Insulators
We introduce a Bloch-like basis in a C-component lowest Landau level
fractional quantum Hall (FQH) effect, which entangles the real and internal
degrees of freedom and preserves an Nx x Ny full lattice translational
symmetry. We implement the Haldane pseudopotential Hamiltonians in this new
basis. Their ground states are the model FQH wave functions, and our Bloch
basis allows for a mutatis mutandis transcription of these model wave functions
to the fractional Chern insulator of arbitrary Chern number C, obtaining wave
functions different from all previous proposals. For C > 1, our wave functions
are related to color-dependent magnetic-flux inserted versions of Halperin and
non-Abelian color-singlet states. We then provide large-size numerical results
for both the C = 1 and C = 3 cases. This new approach leads to improved
overlaps compared to previous proposals. We also discuss the adiabatic
continuation from the fractional Chern insulator to the FQH in our Bloch basis,
both from the energy and the entanglement spectrum perspectives.Comment: 6+epsilon pages, 2 figures. Published version. Added a discussion of
the emergent particle-hole symmetry in a Chern ban
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