Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Weight Pruning and Uncertainty in Radio Galaxy Classification   In this work we use variational inference to quantify the degree of epistemic
uncertainty in model predictions of radio galaxy classification and show that
the level of model posterior variance for individual test samples is correlated
with human uncertainty when labelling radio galaxies. We explore the model
performance and uncertainty calibration for a variety of different weight
priors and suggest that a sparse prior produces more well-calibrated
uncertainty estimates. Using the posterior distributions for individual
weights, we show that signal-to-noise ratio (SNR) ranking allows pruning of the
fully-connected layers to the level of 30% without significant loss of
performance, and that this pruning increases the predictive uncertainty in the
model. Finally we show that, like other work in this field, we experience a
cold posterior effect. We examine whether adapting the cost function in our
model to accommodate model misspecification can compensate for this effect, but
find that it does not make a significant difference. We also examine the effect
of principled data augmentation and find that it improves upon the baseline but
does not compensate for the observed effect fully. We interpret this as the
cold posterior effect being due to the overly effective curation of our
training sample leading to likelihood misspecification, and raise this as a
potential issue for Bayesian deep learning approaches to radio galaxy
classification in future.

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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
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The categories of this paper are: q-alg
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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
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The categories of this paper are: plasm-ph