Source code for torch_geometric.datasets.lastfm_asia

from typing import Optional, Callable

import torch
import numpy as np

from torch_geometric.data import InMemoryDataset, Data, download_url


[docs]class LastFMAsia(InMemoryDataset): r"""The LastFM Asia Network dataset introduced in the `"Characteristic Functions on Graphs: Birds of a Feather, from Statistical Descriptors to Parametric Models" <https://arxiv.org/abs/2005.07959>`_ paper. Nodes represent LastFM users from Asia and edges are friendships. It contains 7,624 nodes, 55,612 edges, 128 node features and 18 classes. Args: root (string): Root directory where the dataset should be saved. 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`) """ url = 'https://graphmining.ai/datasets/ptg/lastfm_asia.npz' def __init__(self, root: str, transform: Optional[Callable] = None, pre_transform: Optional[Callable] = None): super().__init__(root, transform, pre_transform) self.data, self.slices = torch.load(self.processed_paths[0]) @property def raw_file_names(self) -> str: return 'lastfm_asia.npz' @property def processed_file_names(self) -> str: return 'data.pt' def download(self): download_url(self.url, self.raw_dir) def process(self): data = np.load(self.raw_paths[0], 'r', allow_pickle=True) x = torch.from_numpy(data['features']).to(torch.float) y = torch.from_numpy(data['target']).to(torch.long) edge_index = torch.from_numpy(data['edges']).to(torch.long) edge_index = edge_index.t().contiguous() data = Data(x=x, y=y, edge_index=edge_index) if self.pre_transform is not None: data = self.pre_transform(data) torch.save(self.collate([data]), self.processed_paths[0])