Kaggler 0.3.1

Code for Kaggle Data Science Competitions.

# Kaggler
Kaggler is a Python package for Kaggle data science competitions and distributed under the version 3 of the GNU General Public License.

It provides online learning algorithms for classification - inspired by Kaggle user [tinrtgu's code](http://goo.gl/K8hQBx). It uses the sparse input format that handels large sparse data efficiently. Core code is optimized for speed by using Cython.

# Algorithms
Currently algorithms available are as follows:
* Stochastic Gradient Descent (SGD)
* Follow-the-Regularized-Leader (FTRL)
* Factorization Machine (FM)
* Neural Networks (NN) - with a single (NN) or two (NN_H2) hidden layers

# Install
## Using pip
Python package is available at PyPi for pip installation:
```
sudo pip install Kaggler
```

## From source code
If you want to install it from source code:
```
python setup.py build_ext --inplace
sudo python setup.py install
```

# Input Format
libsvm style sparse file format is used for an input.
```
1 1:1 4:1 5:0.5
0 2:1 5:1
```

# Example
## SGD
```
from kaggler.online_model import SGD

clf = SGD(n=2**20, # number of hashed features
a=.01, # learning rate
l1=1e-6, # L1 regularization parameter
l2=1e-6, # L2 regularization parameter
interaction=True) # use feature interaction or not

for x, y in clf.read_sparse('train.sparse'):
p = clf.predict(x) # predict for an input
clf.update(x, p - y) # update the model with the target using error

for x, _ in clf.read_sparse('test.sparse'):
p = clf.predict(x)
```


## FTRL
```
from kaggler.online_model import FTRL

clf = FTRL(n=2**20, # number of hashed features
a=.1, # alpha in the per-coordinate rate
b=1, # beta in the per-coordinate rate
l1=1., # L1 regularization parameter
l2=1., # L2 regularization parameter
interaction=True) # use feature interaction or not

for x, y in clf.read_sparse('train.sparse'):
p = clf.predict(x) # predict for an input
clf.update(x, p - y) # update the model with the target using error

for x, _ in clf.read_sparse('test.sparse'):
p = clf.predict(x)
```

## FM
```
from kaggler.online_model import FM

clf = FM(n=1e5, # number of features
dim=4, # size of factors for interactions
a=.01) # learning rate

for x, y in clf.read_sparse('train.sparse'):
p = clf.predict(x) # predict for an input
clf.update(x, p - y) # update the model with the target using error

for x, _ in clf.read_sparse('test.sparse'):
p = clf.predict(x)
```

## NN with a single hidden layer
```
from kaggler.online_model import NN

clf = NN(n=1e5, # number of features
h=16, # number of hidden units
a=.1, # learning rate
l2=1e-6) # L2 regularization parameter

for x, y in clf.read_sparse('train.sparse'):
p = clf.predict(x) # predict for an input
clf.update(x, p - y) # update the model with the target using error

for x, _ in clf.read_sparse('test.sparse'):
p = clf.predict(x)
```