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A Python implementation of Online Sequential Extreme Machine Learning (OS-ELM) for online machine learning

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*A Python implementation of Online Sequential Extreme Machine Learning (OS-ELM) for online machine learning*

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### Description

**pyoselm** is a Python library for machine learning models with Extreme Machine Learning (ELM) and Online Sequential Machine Learning (OS-ELM). It allows to fit models for regression and classification tasks, both in batch and online learning (either row-by-row or chunk-by-chunk).

This library offers a scikit-learn like API for easy usage. For more details about setup and usage, check the [documentation](http://readthedocs.org/projects/pyoselm/).

> **IMPORTANT:** This library was developed as a research project. It may not be production-ready, so please be aware of that.

### Setup

The easiest way to install this library is using `pip`:

```
$ pip install pyoselm
```

### Usage

Here a simple but complete example of usage.

```python
from pyoselm import OSELMRegressor, OSELMClassifier
from sklearn.datasets import load_digits, make_regression 
from sklearn.model_selection import train_test_split

print("Regression task")
# Model
oselmr = OSELMRegressor(n_hidden=20, activation_func='sigmoid', random_state=123)
# Data
X, y = make_regression(n_samples=1000, n_targets=1, n_features=10, random_state=123)   
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=123)
n_batch = 40

# Fit model with chunks of data
for i in range(20):
    X_batch = X_train[i*n_batch:(i+1)*n_batch]
    y_batch = y_train[i*n_batch:(i+1)*n_batch]
    oselmr.fit(X_batch, y_batch)
    print("Train score for batch %i: %s" % (i+1, str(oselmr.score(X_batch, y_batch))))

# Results
print("Train score of total: %s" % str(oselmr.score(X_train, y_train)))
print("Test score of total: %s" % str(oselmr.score(X_test, y_test)))  
print("")

print("Classification task")
# Model 
oselmc = OSELMClassifier(n_hidden=20, activation_func='sigmoid', random_state=123)
# Data
X, y = load_digits(n_class=5, return_X_y=True) 
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=123)

# Sequential learning
# The first batch of data must have the same size as n_hidden to achieve the first phase (boosting)
batches_x = [X_train[:oselmc.n_hidden]] + [[x_i] for x_i in X_train[oselmc.n_hidden:]]
batches_y = [y_train[:oselmc.n_hidden]] + [[y_i] for y_i in y_train[oselmc.n_hidden:]]

for b_x, b_y in zip(batches_x, batches_y):
    oselmc.fit(b_x, b_y)

print("Train score of total: %s" % str(oselmc.score(X_train, y_train)))
print("Test score of total: %s" % str(oselmc.score(X_test, y_test)))
```

### Development

For development, this project uses [Poetry](https://python-poetry.org/) for dependency management:

```bash
# Install Poetry
curl -sSL https://install.python-poetry.org | python3 -

# Install dependencies
poetry install

# Activate environment
poetry shell

# Run tests
make test           # Unit tests
make test-system    # System tests

# Check code quality
make lint
```

### License

This project is licensed under the Apache License 2.0 - see the [LICENSE](LICENSE) file for details.

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