Learning both Weights and Connections for Efficient Neural Networks

A PyTorch implementation of this paper.

To run, try:

python train.py --model='resnet34' --checkpoint='resnet34'
python prune.py --model='resnet34' --checkpoint='resnet34'

Usage

The core principle behind the training/pruning/finetuning algorithms is as follows:

from models import get_model
from pruners import get_pruner 

model = get_model("resnet18")
pruner = get_pruner("L1Pruner", "unstructured")

for prune_rate in [10, 40, 60, 80]:
    pruner.prune(model, prune_rate)

We can choose between structured/unstructured pruning, as well as the pruning methods which are in pruners (at the time of writing we have support only for magnitude-based pruning and Fisher pruning).

Bring your own models

In order to add a new model family to the repository you basically just need to do two things:

1. Swap out the convolutional layers to use the ConvBNReLU class
2. Define a get_prunable_layers method which returns all the instances of ConvBNReLU which you want to be prunable

Summary

Given a family of ResNets, we can construct a Pareto frontier of the tradeoff between accuracy and number of parameters:

Han et al. posit that we can beat this Pareto frontier by leaving network structures fixed, but removing individual parameters: