hashtron 0.0.2

A Python inference-only engine for the hashtron binary classifier

Hashtron Network Implementation

This project implements a hashtron network with feedforward layers and combiners, including a 2D majority pooling layer. The network supports feedforward inference with hashtron-based classifiers but not training. For training see the original golang version which is CPU optimized.

Modules

• datasets: Loader for demo datasets such as MNIST.
• hash: Implements fast modular hash function.
• hashtron: Implements hashtron classifier.
• layer: Defines layer and combiner interfaces, including a 2D majority pooling layer.
• net: Implements the feedforward network and related utilities.

Usage

To use the network, create an instance of FeedforwardNetwork called e.g. net and add layers using net.new_layer, adding net.new_combiner in between layers. Load your model from ZLIB file using net.io.read_zlib_weights_from_file(file_name). Use net.network.infer(input_number_or_sample) to perform inference.

Examples

from hashtron.net.feedforward.net import Net
from hashtron.layer.majpool2d.layer import MajPool2DLayer
from hashtron.datasets.mnist.mnist import MNISTDataset
import urllib.request
import tempfile
import os

# Specify network size
fanout1 = 3
fanout2 = 5
fanout3 = 3
fanout4 = 5
# Create a Hashtron network (MNIST handwritten digits net)
tron = Net.new()
tron.new_layer(fanout1*fanout2*fanout3*fanout4, 0, 1<<fanout4)
tron.new_combiner(MajPool2DLayer(fanout1*fanout2*fanout4, 1, fanout3, 1, fanout4, 1, 1))
tron.new_layer(fanout1*fanout2, 0, 1<<fanout2)
tron.new_combiner(MajPool2DLayer(fanout2, 1, fanout1, 1, fanout2, 1, 1))
tron.new_layer(1, 0)
# load weights from zlib file
filename = os.path.expanduser('~/classifier/cmd/train_mnist/output.77.json.t.zlib')
if os.path.exists(filename):
    ok = tron.io.read_zlib_weights_from_file(filename)
else:
    # load online model weights zlib file
    with urllib.request.urlopen('https://www.hashtron.cloud/dl/mnist/output.77.json.t.zlib') as f:
        with tempfile.NamedTemporaryFile(delete=True) as dst_file:
            data = f.read()
            dst_file.write(data)
            ok = tron.io.read_zlib_weights_from_file(dst_file.name)

if not ok:
    raise Exception('model weights were not loaded')

# test the datasets
for i in range(2):
    # load offline then online mnist
    try:
        dataset = MNISTDataset(True, i == 0)
    except FileNotFoundError:
        dataset = MNISTDataset(True, i == 0, MNISTDataset.download())
    
    correct = 0
    for sample in dataset:
        pred = tron.network.infer(sample).feature(0) & 1
        actual = sample.output().feature(0) & 1
        if pred == actual:
            correct+=1
    print(100 * correct // len(dataset), '% on', len(dataset), 'MNIST samples')

Summary

This Python translation maintains the structure and functionality of the original Go code, adapting Go-specific features to Python equivalents. The translation includes classes for hash functions, hashtron classifiers, layers, and a feedforward network, along with unit tests and a README for documentation.

Contributing

1. Open issue
2. Fork the repo
3. Implement what is needed (no blobs in repo, host datasets or demo models externally)
4. Add tests as needed
5. Experimentally install the package: pip install -e .
6. Run all testcases: pip install pytest and then python3 -m pytest
7. Contribute a pull request

License

MIT