106 research outputs found
Restricted modules and associated vertex algebras of extended Heisenberg-Virasoro algebra
In this paper, a family of infinite dimensional Lie algebras
is introduced and investigated, called the extended
Heisenberg-Virasoro algebra,denoted by . These Lie
algebras are related to the superconformal algebra and the
Bershadsky-Polyakov algebra. We study restricted modules and associated vertex
algebras of the Lie algebra . More precisely, we construct
its associated vertex (operator) algebras
, and show that the category of vertex
algebra -modules is equivalent to the
category of restricted -modules of level .Then
we give uniform constructions of simple restricted
-modules. Also, we present several equivalent
characterizations of simple restricted modules over .Comment: 22 page
Study of photon detection efficiency and position resolution of BESIII electromagnetic calorimeter
We study the photon detection efficiency and position resolution of the
electromagnetic calorimeter (EMC) of the BESIII experiment. The control sample
of the initial-state-radiation (ISR) process of is used at and resonances for the EMC
calibration and photon detection efficiency study. Photon detection efficiency
is defined as the predicted photon, obtained by performing a kinematic fit with
two muon tracks, matched with real photons in the EMC. The spatial resolution
of the EMC is defined as the separation in polar () and azimuthal
() angles between charged track and associated cluster centroid on the
front face of the EMC crystals.Comment: 5 page
Online Meta-Critic Learning for Off-Policy Actor-Critic Methods
Off-Policy Actor-Critic (Off-PAC) methods have proven successful in a variety
of continuous control tasks. Normally, the critic's action-value function is
updated using temporal-difference, and the critic in turn provides a loss for
the actor that trains it to take actions with higher expected return. In this
paper, we introduce a novel and flexible meta-critic that observes the learning
process and meta-learns an additional loss for the actor that accelerates and
improves actor-critic learning. Compared to the vanilla critic, the meta-critic
network is explicitly trained to accelerate the learning process; and compared
to existing meta-learning algorithms, meta-critic is rapidly learned online for
a single task, rather than slowly over a family of tasks. Crucially, our
meta-critic framework is designed for off-policy based learners, which
currently provide state-of-the-art reinforcement learning sample efficiency. We
demonstrate that online meta-critic learning leads to improvements in avariety
of continuous control environments when combined with contemporary Off-PAC
methods DDPG, TD3 and the state-of-the-art SAC.Comment: NeurIPS 202
Dynamic Memory-based Curiosity: A Bootstrap Approach for Exploration
The sparsity of extrinsic rewards poses a serious challenge for reinforcement
learning (RL). Currently, many efforts have been made on curiosity which can
provide a representative intrinsic reward for effective exploration. However,
the challenge is still far from being solved. In this paper, we present a novel
curiosity for RL, named DyMeCu, which stands for Dynamic Memory-based
Curiosity. Inspired by human curiosity and information theory, DyMeCu consists
of a dynamic memory and dual online learners. The curiosity arouses if
memorized information can not deal with the current state, and the information
gap between dual learners can be formulated as the intrinsic reward for agents,
and then such state information can be consolidated into the dynamic memory.
Compared with previous curiosity methods, DyMeCu can better mimic human
curiosity with dynamic memory, and the memory module can be dynamically grown
based on a bootstrap paradigm with dual learners. On multiple benchmarks
including DeepMind Control Suite and Atari Suite, large-scale empirical
experiments are conducted and the results demonstrate that DyMeCu outperforms
competitive curiosity-based methods with or without extrinsic rewards. We will
release the code to enhance reproducibility
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