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rbm-ae-tf

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Tensorflow 1.X implementation of Restricted Boltzman Machine(RBM) and Autoencoder with layerwise pretraining.

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# rbm-ae-tf
Tensorflow implementation of Restricted Boltzman Machine and Autoencoder for layerwise pretraining of Deep Autoencoders with RBM. Idea is to first create RBMs for pretraining weights for autoencoder. Then weigts for autoencoder are loaded and autoencoder is trained again. In this implementation you can also use tied weights for autoencoder(that means that encoding and decoding layers have same transposed weights!).

> Thanks saliksyed and myme5261314 for your gists and for inspiration of implementing rbm and autoencoders!

More about pretraining of weights in this paper:

##### [Reducing the Dimensionality of Data with Neural Networks](https://www.cs.toronto.edu/~hinton/science.pdf)

```python
from rbm import RBM
from au import AutoEncoder
import tensorflow as tf
import input_data

flags = tf.app.flags
FLAGS = flags.FLAGS
flags.DEFINE_string('data_dir', '/tmp/data/', 'Directory for storing data')

# First RBM
mnist = input_data.read_data_sets(FLAGS.data_dir, one_hot=True)
rbmobject1 = RBM(784, 100, ['rbmw1', 'rbvb1', 'rbmhb1'], 0.001)

# Second RBM
rbmobject2 = RBM(100, 20, ['rbmw2', 'rbvb2', 'rbmhb2'], 0.001)

# Autoencoder
autoencoder = AutoEncoder(784, [100, 20],  [['rbmw1', 'rbmhb1'],
                                            ['rbmw2', 'rbmhb2']],
                                           tied_weights=False)

# Train First RBM
for i in range(100):
  batch_xs, batch_ys = mnist.train.next_batch(10)
  cost = rbmobject1.partial_fit(batch_xs)
rbmobject1.save_weights('./rbmw1.chp')

# Train Second RBM
for i in range(100):
  # Transform features with first rbm for second rbm
  batch_xs, batch_ys = mnist.train.next_batch(10)
  batch_xs = rbmobject1.transform(batch_xs)
  cost = rbmobject2.partial_fit(batch_xs)
rbmobject2.save_weights('./rbmw2.chp')

# Load RBM weights to Autoencoder
autoencoder.load_rbm_weights('./rbmw1.chp', ['rbmw1', 'rbmhb1'], 0)
autoencoder.load_rbm_weights('./rbmw2.chp', ['rbmw2', 'rbmhb2'], 1)

# Train Autoencoder
for i in range(500):
  batch_xs, batch_ys = mnist.train.next_batch(10)
  cost = autoencoder.partial_fit(batch_xs)

autoencoder.save_weights('./au.chp')
autoencoder.load_weights('./au.chp')
```

Feel free to make updates, repairs. You can enhance implementation with some tips from:
> [Practical Guide to training RBM](https://www.cs.toronto.edu/~hinton/absps/guideTR.pdf)

##### PCA vs DeepAutoencoder(RBM) on MNIST:

![alt tag](https://raw.githubusercontent.com/Cospel/rbm-ae-tf/master/test-img/pcafig.png)
![alt tag](https://raw.githubusercontent.com/Cospel/rbm-ae-tf/master/test-img/deepauto.png)

rbm-ae-tf

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