prototorch_models/docs/source/library.rst
2021-05-26 21:29:37 +02:00

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.. Available Models
Models
========================================
.. image:: _static/img/model_tree.png
:width: 600
Unsupervised Methods
-----------------------------------------
.. autoclass:: prototorch.models.unsupervised.KNN
:members:
.. autoclass:: prototorch.models.unsupervised.NeuralGas
:members:
Classical Learning Vector Quantization
-----------------------------------------
Original LVQ models introduced by :cite:t:`kohonen1989`.
These heuristic algorithms do not use gradient descent.
.. autoclass:: prototorch.models.lvq.LVQ1
:members:
.. autoclass:: prototorch.models.lvq.LVQ21
:members:
It is also possible to use the GLVQ structure as shown by :cite:t:`sato1996` in chapter 4.
This allows the use of gradient descent methods.
.. autoclass:: prototorch.models.glvq.GLVQ1
:members:
.. autoclass:: prototorch.models.glvq.GLVQ21
:members:
Generalized Learning Vector Quantization
-----------------------------------------
:cite:t:`sato1996` presented a LVQ variant with a cost function called GLVQ.
This allows the use of gradient descent methods.
.. autoclass:: prototorch.models.glvq.GLVQ
:members:
The cost function of GLVQ can be extended by a learnable dissimilarity.
These learnable dissimilarities assign relevances to each data dimension during the learning phase.
For example GRLVQ :cite:p:`hammer2002` and GMLVQ :cite:p:`schneider2009` .
.. autoclass:: prototorch.models.glvq.GRLVQ
:members:
.. autoclass:: prototorch.models.glvq.GMLVQ
:members:
The dissimilarity from GMLVQ can be interpreted as a projection into another dataspace.
Applying this projection only to the data results in LVQMLN
.. autoclass:: prototorch.models.glvq.LVQMLN
:members:
The projection idea from GMLVQ can be extended to an arbitrary transformation with learnable parameters.
.. autoclass:: prototorch.models.glvq.SiameseGLVQ
:members:
Probabilistic Models
--------------------------------------------
Probabilistic variants assume, that the prototypes generate a probability distribution over the classes.
For a test sample they return a distribution instead of a class assignment.
The following two algorihms were presented by :cite:t:`seo2003` .
Every prototypes is a center of a gaussian distribution of its class, generating a mixture model.
.. autoclass:: prototorch.models.probabilistic.LikelihoodRatioLVQ
:members:
.. autoclass:: prototorch.models.probabilistic.RSLVQ
:members:
Missing:
- PLVQ
Classification by Component
--------------------------------------------
The Classification by Component (CBC) has been introduced by :cite:t:`saralajew2019` .
In a CBC architecture there is no class assigned to the prototypes.
Instead the dissimilarities are used in a reasoning process, that favours or rejects a class by a learnable degree.
The output of a CBC network is a probability distribution over all classes.
.. autoclass:: prototorch.models.cbc.CBC
:members:
.. autoclass:: prototorch.models.cbc.ImageCBC
:members:
Visualization
========================================
Visualization is very specific to its application.
PrototorchModels delivers visualization for two dimensional data and image data.
The visulizations can be shown in a seperate window and inside a tensorboard.
.. automodule:: prototorch.models.vis
:members:
:undoc-members:
Bibliography
========================================
.. bibliography::