miniml-jax 0.1.0

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MiniML

MiniML (pronounced "minimal") is a tiny machine-learning framework which uses Jax as its core engine, but mixes a PyTorch inspired approach to building model with Scikit-learn's interface (using the .fit and .predict methods), and is powered by SciPy's optimization algorithms. It's meant for simple prototyping of small ML architectures that allows more flexibility than Scikit's built-in models without sacrificing too much on performance.

Training a linear model in MiniML for example looks as simple as this:

class LinearModel(MiniMLModel):
    A: MiniMLParam
    b: MiniMLParam

    def __init__(self, n_in: int, n_out: int):
        self.A = MiniMLParam((n_in,n_out))
        self.b = MiniMLParam((n_out,))
        super().__init__()

    def predict(self, X):
        return [e-mail]+self.b.value

lin_model = LinearModel(X.shape[1], y.shape[1])
lin_model.randomize()
lin_model.fit(X, y)
y_hat = lin_model.predict(X)

Installation

Simply install this package from PyPi:

pip install miniml-jax

Usage

The two core types are MiniMLParam and MiniMLModel. There are also MiniMLParamList and MiniMLModelList containers to store multiple of either inside.

To define a model in MiniML, subclass MiniMLModel and define your parameters as MiniMLParam attributes in the __init__ method. Remember to make sure that:

• every parameter or child model is stored either directly as a class member, or inside a corresponding List class;
• the super().__init__() constructor is called at the end.

Then, implement the predict method, which takes an input array and returns the model's prediction. After instantiating your model, call bind() to initialize parameter buffers, or use directly randomize() to initialize parameter values. You can then use methods like fit, save, and load.

Example: Linear Model

import jax.numpy as jnp
from miniml.param import MiniMLParam
from miniml.model import MiniMLModel

class LinearModel(MiniMLModel):
    def __init__(self):
        self.a = MiniMLParam((1,))
        self.b = MiniMLParam((1,))
        super().__init__()
    def predict(self, X):
        return self.a.value * X + self.b.value

# Create and bind the model
model = LinearModel()
model.bind()
model.randomize()

# Fit to data (e.g., y = 2x + 1)
X = jnp.linspace(0, 10, 20)
y = 2 * X + 1
model.fit(X, y)

# Save and load
model.save('model.npz')
model.load('model.npz')

Nested Models

You can compose models by including other MiniMLModel instances as attributes. For example:

class ConstantModel(MiniMLModel):

    def __init__(self):
        self._c = MiniMLParam((1,))
        super().__init__()

    def predict(self, X):
        return self._c.value

class LinearWithConstant(MiniMLModel):
    def __init__(self):
        self._b = MiniMLParam((5,))
        self._M = MiniMLParam((5, 5))
        self._c = ConstantModel()
        super().__init__()

    def predict(self, X):
        return self._M.value @ X + self._b.value[:, None] + self._c.predict(X)

See the full documentation.