import os
import os.path as osp
import glob
import torch
from torch_geometric.data import InMemoryDataset, download_url, extract_zip
from torch_geometric.io import read_off
[docs]class GeometricShapes(InMemoryDataset):
r"""Synthetic dataset of various geometric shapes like cubes, spheres or
pyramids.
.. note::
Data objects hold mesh faces instead of edge indices.
To convert the mesh to a graph, use the
:obj:`torch_geometric.transforms.FaceToEdge` as :obj:`pre_transform`.
To convert the mesh to a point cloud, use the
:obj:`torch_geometric.transforms.SamplePoints` as :obj:`transform` to
sample a fixed number of points on the mesh faces according to their
face area.
Args:
root (string): Root directory where the dataset should be saved.
train (bool, optional): If :obj:`True`, loads the training dataset,
otherwise the test dataset. (default: :obj:`True`)
transform (callable, optional): A function/transform that takes in an
:obj:`torch_geometric.data.Data` object and returns a transformed
version. The data object will be transformed before every access.
(default: :obj:`None`)
pre_transform (callable, optional): A function/transform that takes in
an :obj:`torch_geometric.data.Data` object and returns a
transformed version. The data object will be transformed before
being saved to disk. (default: :obj:`None`)
pre_filter (callable, optional): A function that takes in an
:obj:`torch_geometric.data.Data` object and returns a boolean
value, indicating whether the data object should be included in the
final dataset. (default: :obj:`None`)
"""
url = 'https://github.com/Yannick-S/geometric_shapes/raw/master/raw.zip'
def __init__(self, root, train=True, transform=None, pre_transform=None,
pre_filter=None):
super(GeometricShapes, self).__init__(root, transform, pre_transform,
pre_filter)
path = self.processed_paths[0] if train else self.processed_paths[1]
self.data, self.slices = torch.load(path)
@property
def raw_file_names(self):
return ['2d_circle']
@property
def processed_file_names(self):
return ['training.pt', 'test.pt']
def download(self):
path = download_url(self.url, self.root)
extract_zip(path, self.root)
os.unlink(path)
def process(self):
torch.save(self.process_set('train'), self.processed_paths[0])
torch.save(self.process_set('test'), self.processed_paths[1])
def process_set(self, dataset):
categories = glob.glob(osp.join(self.raw_dir, '*', ''))
categories = sorted([x.split(os.sep)[-2] for x in categories])
data_list = []
for target, category in enumerate(categories):
folder = osp.join(self.raw_dir, category, dataset)
paths = glob.glob('{}/*.off'.format(folder))
for path in paths:
data = read_off(path)
data.pos = data.pos - data.pos.mean(dim=0, keepdim=True)
data.y = torch.tensor([target])
data_list.append(data)
if self.pre_filter is not None:
data_list = [d for d in data_list if self.pre_filter(d)]
if self.pre_transform is not None:
data_list = [self.pre_transform(d) for d in data_list]
return self.collate(data_list)