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Showing content from https://github.com/rusty1s/pytorch_spline_conv below:

rusty1s/pytorch_spline_conv: Implementation of the Spline-Based Convolution Operator of SplineCNN in PyTorch

This is a PyTorch implementation of the spline-based convolution operator of SplineCNN, as described in our paper:

Matthias Fey, Jan Eric Lenssen, Frank Weichert, Heinrich Müller: SplineCNN: Fast Geometric Deep Learning with Continuous B-Spline Kernels (CVPR 2018)

The operator works on all floating point data types and is implemented both for CPU and GPU.

We provide pip wheels for all major OS/PyTorch/CUDA combinations, see here.

To install the binaries for PyTorch 2.8.0, simply run

pip install torch-spline-conv -f https://data.pyg.org/whl/torch-2.8.0+${CUDA}.html

where ${CUDA} should be replaced by either cpu, cu126, cu128, or cu129 depending on your PyTorch installation.

To install the binaries for PyTorch 2.7.0, simply run

pip install torch-spline-conv -f https://data.pyg.org/whl/torch-2.7.0+${CUDA}.html

where ${CUDA} should be replaced by either cpu, cu118, cu126, or cu128 depending on your PyTorch installation.

To install the binaries for PyTorch 2.6.0, simply run

pip install torch-spline-conv -f https://data.pyg.org/whl/torch-2.6.0+${CUDA}.html

where ${CUDA} should be replaced by either cpu, cu118, cu124, or cu126 depending on your PyTorch installation.

Note: Binaries of older versions are also provided for PyTorch 1.4.0, PyTorch 1.5.0, PyTorch 1.6.0, PyTorch 1.7.0/1.7.1, PyTorch 1.8.0/1.8.1, PyTorch 1.9.0, PyTorch 1.10.0/1.10.1/1.10.2, PyTorch 1.11.0, PyTorch 1.12.0/1.12.1, PyTorch 1.13.0/1.13.1, PyTorch 2.0.0/2.0.1, PyTorch 2.1.0/2.1.1/2.1.2, PyTorch 2.2.0/2.2.1/2.2.2, PyTorch 2.3.0/2.3.1, PyTorch 2.4.0/2.4.1, and PyTorch 2.5.0/2.5.1 (following the same procedure). For older versions, you need to explicitly specify the latest supported version number or install via pip install --no-index in order to prevent a manual installation from source. You can look up the latest supported version number here.

Ensure that at least PyTorch 1.4.0 is installed and verify that cuda/bin and cuda/include are in your $PATH and $CPATH respectively, e.g.:

$ python -c "import torch; print(torch.__version__)"
>>> 1.4.0

$ echo $PATH
>>> /usr/local/cuda/bin:...

$ echo $CPATH
>>> /usr/local/cuda/include:...

Then run:

pip install torch-spline-conv

When running in a docker container without NVIDIA driver, PyTorch needs to evaluate the compute capabilities and may fail. In this case, ensure that the compute capabilities are set via TORCH_CUDA_ARCH_LIST, e.g.:

export TORCH_CUDA_ARCH_LIST = "6.0 6.1 7.2+PTX 7.5+PTX"

from torch_spline_conv import spline_conv

out = spline_conv(x,
                  edge_index,
                  pseudo,
                  weight,
                  kernel_size,
                  is_open_spline,
                  degree=1,
                  norm=True,
                  root_weight=None,
                  bias=None)

Applies the spline-based convolution operator

• x (Tensor) - Input node features of shape (number_of_nodes x in_channels).
• edge_index (LongTensor) - Graph edges, given by source and target indices, of shape (2 x number_of_edges).
• pseudo (Tensor) - Edge attributes, ie. pseudo coordinates, of shape (number_of_edges x number_of_edge_attributes) in the fixed interval [0, 1].
• weight (Tensor) - Trainable weight parameters of shape (kernel_size x in_channels x out_channels).
• kernel_size (LongTensor) - Number of trainable weight parameters in each edge dimension.
• is_open_spline (ByteTensor) - Whether to use open or closed B-spline bases for each dimension.
• degree (int, optional) - B-spline basis degree. (default: 1)
• norm (bool, optional): Whether to normalize output by node degree. (default: True)
• root_weight (Tensor, optional) - Additional shared trainable parameters for each feature of the root node of shape (in_channels x out_channels). (default: None)
• bias (Tensor, optional) - Optional bias of shape (out_channels). (default: None)

• out (Tensor) - Out node features of shape (number_of_nodes x out_channels).

import torch
from torch_spline_conv import spline_conv

x = torch.rand((4, 2), dtype=torch.float)  # 4 nodes with 2 features each
edge_index = torch.tensor([[0, 1, 1, 2, 2, 3], [1, 0, 2, 1, 3, 2]])  # 6 edges
pseudo = torch.rand((6, 2), dtype=torch.float)  # two-dimensional edge attributes
weight = torch.rand((25, 2, 4), dtype=torch.float)  # 25 parameters for in_channels x out_channels
kernel_size = torch.tensor([5, 5])  # 5 parameters in each edge dimension
is_open_spline = torch.tensor([1, 1], dtype=torch.uint8)  # only use open B-splines
degree = 1  # B-spline degree of 1
norm = True  # Normalize output by node degree.
root_weight = torch.rand((2, 4), dtype=torch.float)  # separately weight root nodes
bias = None  # do not apply an additional bias

out = spline_conv(x, edge_index, pseudo, weight, kernel_size,
                  is_open_spline, degree, norm, root_weight, bias)

print(out.size())
torch.Size([4, 4])  # 4 nodes with 4 features each

Please cite our paper if you use this code in your own work:

@inproceedings{Fey/etal/2018,
  title={{SplineCNN}: Fast Geometric Deep Learning with Continuous {B}-Spline Kernels},
  author={Fey, Matthias and Lenssen, Jan Eric and Weichert, Frank and M{\"u}ller, Heinrich},
  booktitle={IEEE Conference on Computer Vision and Pattern Recognition (CVPR)},
  year={2018},
}

torch-spline-conv also offers a C++ API that contains C++ equivalent of python models.

mkdir build
cd build
# Add -DWITH_CUDA=on support for the CUDA if needed
cmake ..
make
make install

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