Search Results for author: Takayuki Osogami

Found 18 papers, 1 papers with code

Regression with Sensor Data Containing Incomplete Observations

no code implementations26 Apr 2023 Takayuki Katsuki, Takayuki Osogami

This leads to a bias toward lower values in labels and the resultant learning because labels may have lower values due to incomplete observations, even if the actual magnitude of the phenomenon was high.

regression

Online Learning in Supply-Chain Games

no code implementations8 Jul 2022 Nicolò Cesa-Bianchi, Tommaso Cesari, Takayuki Osogami, Marco Scarsini, Segev Wasserkrug

We study a repeated game between a supplier and a retailer who want to maximize their respective profits without full knowledge of the problem parameters.

Proofs and additional experiments on Second order techniques for learning time-series with structural breaks

no code implementations15 Dec 2020 Takayuki Osogami

We provide complete proofs of the lemmas about the properties of the regularized loss function that is used in the second order techniques for learning time-series with structural breaks in Osogami (2021).

Time Series Time Series Analysis

Supplementary material for Uncorrected least-squares temporal difference with lambda-return

no code implementations14 Nov 2019 Takayuki Osogami

Here, we provide a supplementary material for Takayuki Osogami, "Uncorrected least-squares temporal difference with lambda-return," which appears in {\it Proceedings of the 34th AAAI Conference on Artificial Intelligence} (AAAI-20).

Visual analytics for team-based invasion sports with significant events and Markov reward process

no code implementations2 Jul 2019 Kun Zhao, Takayuki Osogami, Tetsuro Morimura

To solve this problem, we consider a whole match as a Markov chain of significant events, so that event values can be estimated with a continuous parameter space by solving the Markov chain with a machine learning model.

Real-time tree search with pessimistic scenarios

no code implementations28 Feb 2019 Takayuki Osogami, Toshihiro Takahashi

Autonomous agents need to make decisions in a sequential manner, under partially observable environment, and in consideration of how other agents behave.

Dynamic Boltzmann Machines for Second Order Moments and Generalized Gaussian Distributions

no code implementations17 Dec 2017 Rudy Raymond, Takayuki Osogami, Sakyasingha Dasgupta

Gaussian DyBM is a DyBM that assumes the predicted data is generated by a Gaussian distribution whose first-order moment (mean) dynamically changes over time but its second-order moment (variance) is fixed.

Time Series Time Series Analysis

Boltzmann machines and energy-based models

1 code implementation20 Aug 2017 Takayuki Osogami

We review Boltzmann machines and energy-based models.

Boltzmann machines for time-series

no code implementations20 Aug 2017 Takayuki Osogami

We then review dynamic Boltzmann machines (DyBMs), whose learning rule is local in time.

Time Series Time Series Analysis

Bidirectional learning for time-series models with hidden units

no code implementations ICML 2017 Takayuki Osogami, Hiroshi Kajino, Taro Sekiyama

Hidden units can play essential roles in modeling time-series having long-term dependency or on-linearity but make it difficult to learn associated parameters.

Time Series Time Series Analysis

Learning binary or real-valued time-series via spike-timing dependent plasticity

no code implementations15 Dec 2016 Takayuki Osogami

A dynamic Boltzmann machine (DyBM) has been proposed as a model of a spiking neural network, and its learning rule of maximizing the log-likelihood of given time-series has been shown to exhibit key properties of spike-timing dependent plasticity (STDP), which had been postulated and experimentally confirmed in the field of neuroscience as a learning rule that refines the Hebbian rule.

Time Series Time Series Analysis

Learning dynamic Boltzmann machines with spike-timing dependent plasticity

no code implementations29 Sep 2015 Takayuki Osogami, Makoto Otsuka

We propose a particularly structured Boltzmann machine, which we refer to as a dynamic Boltzmann machine (DyBM), as a stochastic model of a multi-dimensional time-series.

Time Series Time Series Analysis

Restricted Boltzmann machines modeling human choice

no code implementations NeurIPS 2014 Takayuki Osogami, Makoto Otsuka

We extend the multinomial logit model to represent some of the empirical phenomena that are frequently observed in the choices made by humans.

Solving inverse problem of Markov chain with partial observations

no code implementations NeurIPS 2013 Tetsuro Morimura, Takayuki Osogami, Tsuyoshi Ide

The Markov chain is a convenient tool to represent the dynamics of complex systems such as traffic and social systems, where probabilistic transition takes place between internal states.

Robustness and risk-sensitivity in Markov decision processes

no code implementations NeurIPS 2012 Takayuki Osogami

We also show that a risk-sensitive MDP of minimizing an iterated risk measure that is composed of certain coherent risk measures is equivalent to a robust MDP of minimizing the worst-case expectation when the possible deviations of uncertain parameters from their nominal values are characterized with a concave function.

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