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2021.7.20_NeurIPS-2020-introducing-routing-uncertainty
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2021.7.20_NeurIPS-2020-introducing-routing-uncertainty
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34t h C onf eren ce on Ne ural I nfo rma tio n P ro c es s in g S yst em s (Neu rIP S
2020 ), Vanc ouve r, Canad a.
Introduction
Introduction
Weaknesses of Capsule Networks:
1. The memory bottleneck incurred by vector valued activations;
2. Iterative nature of capsule routing algorithms results in inefficient models;
3. They are also prone to underfitting or overfitting if the number of routing iterations
isn’t properly set
To address the above weaknesses one may decide to naively replace the iterative nature
of capsule routing with some faster alternative.
Introduction-motivations
4 core premises of Capsule networks:
1. Whether viewpoint-invariance and affine transformation robustness
properties are retained;
2. Changes in assumptions about part-object relationships are made explicit;
3. Whether capsules are still activated based on high-dimensional coincidences;
4. How do we handle the intrinsic uncertainty in assembling parts into objects.
we focus on the core premises of capsule networks, and on enhancing their
advantages over CNNs: viewpoint-invariance, and affine transformation robustness
whilst being more efficient.
Introduction-Contribution
Rather than performing local iterative routing between adjacent capsule layers which is
inefficient, we propose an alternative global view based on representing the inherent
uncertainty in part-object relationships, by approximating a posterior distribution over
part-object connections.
Sources of uncertainty in assembling objects via a composition of parts can arise from
numerous sources, such as:
1. feature occlusions due to observed viewpoints;
2. sensory noise in captured data;
3. object symmetries for which poses may be ambiguous such as spherical objects/parts.
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