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chris-santiago authored Sep 9, 2023
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# Experimenting with AutoEncoders

Here, we (roughly) experiment with various autoencoder architectures to tease out their ability to learn meaningful representations of data in an unsupervised setting.
This repo (roughly) experiments with various autoencoder architectures to tease out their ability to learn meaningful representations of data in an unsupervised setting.

- Each model is trained on the 60k MNIST training set.
- We use each model's respective encoder to create features on varying subsets of the 10k MNIST test set.
- We use each model's respective encodings to train a linear classifier:
- Each model is trained (unsupervised) on the 60k MNIST training set.
- Models are evaluated via transfer learning on the 10k MNIST test set.
- Each model's respective encodings of varying subsets of the 10k MNIST test set are input to train a linear classifier:
- Each linear classifier is trained on increasing split sizes ([10, 100, 1000, 2000, 4000, 8000]) and evaluated on remaining subset of the 10K MNIST test set.
- See `autoencoders/compare.py` for details.
- Classifier performance is measured by mulit-class accuracy and (ROC)AUC.

## Notes

- Most models follow the architectures from their respective papers (see `autoencoders/models/`).
- Hyperparameter optimization is not performed on the encoder models nor the linear classifiers.
- Model specification/configuration located in the `outputs/` directory.

## Results

![](https://github.com/chris-santiago/autoencoders/blob/master/outputs/encoder-accuracy.png)

![](https://github.com/chris-santiago/autoencoders/blob/master/outputs/encoder-auc.png)
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