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Rapid machine learning prototyping

Project description

Ramp - Rapid Machine Learning Prototyping
=========================================

Ramp is a python module for rapid prototyping of machine learning
solutions. It is essentially a [pandas](http://pandas.pydata.org)
wrapper around various python machine learning and statistics libraries
([scikit-learn](http://scikit-learn.org), [rpy2](http://rpy.sourceforge.net/rpy2.html), etc.),
providing a simple, declarative syntax for
exploring features, algorithms and transformations quickly and
efficiently.

Documentation: http://ramp.readthedocs.org

**Why Ramp?**

* **Clean, declarative syntax**

No more hackish one-off spaghetti scripts!

* **Complex feature transformations**

Chain and combine features:
```python
Normalize(Log('x'))
Interactions([Log('x1'), (F('x2') + F('x3')) / 2])
```
Reduce feature dimension:
```python
DimensionReduction([F('x%d'%i) for i in range(100)], decomposer=PCA(n_components=3))
```
Incorporate residuals or predictions to blend with other models:
```python
Residuals(config_model1) + Predictions(config_model2)
```
Any feature that uses the target ("y") variable will automatically respect the
current training and test sets.


* **Caching**

Ramp caches and stores on disk in fast HDF5 format (or elsewhere if you want) all features and models it
computes, so nothing is recomputed unnecessarily. Results are stored
and can be retrieved, compared, blended, and reused between runs.

* **Easy extensibility**

Ramp has a simple API, allowing you to plug in estimators from
scikit-learn, rpy2 and elsewhere, or easily build your own feature
transformations, metrics, feature selectors, reporters, or estimators.


## Quick start
[Getting started with Ramp: Classifying insults](http://www.kenvanharen.com/2012/11/getting-started-with-ramp-detecting.html)

Or, the quintessential Iris example:

```python
import pandas
from ramp import *
import urllib2
import sklearn
from sklearn import decomposition


# fetch and clean iris data from UCI
data = pandas.read_csv(urllib2.urlopen(
"http://archive.ics.uci.edu/ml/machine-learning-databases/iris/iris.data"))
data = data.drop([149]) # bad line
columns = ['sepal_length', 'sepal_width', 'petal_length', 'petal_width', 'class']
data.columns = columns


# all features
features = [FillMissing(f, 0) for f in columns[:-1]]

# features, log transformed features, and interaction terms
expanded_features = (
features +
[Log(F(f) + 1) for f in features] +
[
F('sepal_width') ** 2,
combo.Interactions(features),
]
)


# Define several models and feature sets to explore,
# run 5 fold cross-validation on each and print the results.
# We define 2 models and 4 feature sets, so this will be
# 4 * 2 = 8 models tested.
shortcuts.cv_factory(
data=data,

target=[AsFactor('class')],
metrics=[[metrics.GeneralizedMCC()]],

# Try out two algorithms
model=[
sklearn.ensemble.RandomForestClassifier(n_estimators=20),
sklearn.linear_model.LogisticRegression(),
],

# and 4 feature sets
features=[
expanded_features,

# Feature selection
[trained.FeatureSelector(
expanded_features,
# use random forest's importance to trim
selectors.RandomForestSelector(classifier=True),
target=AsFactor('class'), # target to use
n_keep=5, # keep top 5 features
)],

# Reduce feature dimension (pointless on this dataset)
[combo.DimensionReduction(expanded_features,
decomposer=decomposition.PCA(n_components=4))],

# Normalized features
[Normalize(f) for f in expanded_features],
]
)
```

## Status
Ramp is very alpha currently, so expect bugs, bug fixes and API changes.

## Requirements
* Numpy
* Scipy
* Pandas
* PyTables
* Sci-kit Learn

## Author
Ken Van Haren. Email with feedback/questions: kvh@science.io

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