Bound propagation
Linear and interval bound propagation in Pytorch with easy-to-use API, GPU support, and heavy parallization. Initially made as an alternative to the original CROWN implementation which featured only Numpy, lots of for-loops, and a cumbersome API.
To install:
pip install bound-propagation
Supported bound propagation methods:
For the examples below assume the following network definition:
from torch import nn
from bound_propagation import crown, crown_ibp, ibp
# The decorators _must_ be on a subclass of nn.Sequential
@crown
@crown_ibp
@ibp
class Network(nn.Sequential):
def __init__(self, *args):
if args:
# To support __get_index__ of nn.Sequential when slice indexing
# CROWN (and implicitly CROWN-IBP) is doing this underlying
super().__init__(*args)
else:
in_size = 30
classes = 10
super().__init__(
nn.Linear(in_size, 16),
nn.Tanh(),
nn.Linear(16, 16),
nn.Tanh(),
nn.Linear(16, classes)
)
net = Network()
Alternatively, you can add the functions to your network by calling the functions with an instance of your network:
from torch import nn
from bound_propagation import crown, crown_ibp, ibp
class Network(nn.Sequential):
def __init__(self, *args):
if args:
# To support __get_index__ of nn.Sequential when slice indexing
# CROWN (and implicitly CROWN-IBP) is doing this underlying
super().__init__(*args)
else:
in_size = 30
classes = 10
super().__init__(
nn.Linear(in_size, 16),
nn.Tanh(),
nn.Linear(16, 16),
nn.Tanh(),
nn.Linear(16, classes)
)
# The instance _must_ be an nn.Sequential or a subclass thereof
net = crown(crown_ibp(ibp(Network())))
The method also works with nn.Sigmoid and nn.ReLU.
Interval bounds
To get interval bounds for either IBP, CROWN, or CROWN-IBP:
x = torch.rand(100, 30)
epsilon = 0.1
lower, upper = x - epsilon, x + epsilon
ibp_bounds = net.ibp(lower, upper)
crown_bounds = net.crown_interval(lower, upper)
crown_ibp_bounds = net.crown_ibp_interval(lower, upper)
Linear bounds
To get linear bounds for either CROWN or CROWN-IBP:
x = torch.rand(100, 30)
epsilon = 0.1
lower, upper = x - epsilon, x + epsilon
crown_bounds = net.crown_linear(lower, upper)
crown_ibp_bounds = net.crown_ibp_linear(lower, upper)
Authors
- Frederik Baymler Mathiesen - PhD student @ TU Delft
1 maintainer
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