Source code for gammagl.datasets.planetoid

import numpy as np
import tensorlayerx as tlx
import os.path as osp
from typing import Callable, List, Optional
from gammagl.data import download_url
from gammagl.data import InMemoryDataset
from gammagl.io.planetiod import read_planetoid_data

try:
    import cPickle as pickle
except ImportError:
    import pickle


[docs] class Planetoid(InMemoryDataset): r""" The citation network datasets "Cora", "CiteSeer" and "PubMed" from the `"Revisiting Semi-Supervised Learning with Graph Embeddings" <https://arxiv.org/abs/1603.08861>`_ paper. Nodes represent documents and edges represent citation links. Training, validation and test splits are given by binary masks. Parameters ---------- root: str, optional Root directory where the dataset should be saved. name: str, optional The name of the dataset (:obj:`"Cora"`, :obj:`"CiteSeer"`, :obj:`"PubMed"`). split: str, optional The type of dataset split (:obj:`"public"`, :obj:`"full"`, :obj:`"random"`). If set to :obj:`"public"`, the split will be the public fixed split from the `"Revisiting Semi-Supervised Learning with Graph Embeddings" <https://arxiv.org/abs/1603.08861>`_ paper. If set to :obj:`"full"`, all nodes except those in the validation and test sets will be used for training (as in the `"FastGCN: Fast Learning with Graph Convolutional Networks via Importance Sampling" <https://arxiv.org/abs/1801.10247>`_ paper). If set to :obj:`"random"`, train, validation, and test sets will be randomly generated, according to :obj:`num_train_per_class`, :obj:`num_val` and :obj:`num_test`. (default: :obj:`"public"`) num_train_per_class: int, optional The number of training samples per class in case of :obj:`"random"` split. (default: :obj:`20`) num_val: int, optional The number of validation samples in case of :obj:`"random"` split. (default: :obj:`500`) num_test: int, optional The number of test samples in case of :obj:`"random"` split. (default: :obj:`1000`) transform: callable, optional A function/transform that takes in an :obj:`gammagl.data.Graph` 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:`gammagl.data.Graph` object and returns a transformed version. The data object will be transformed before being saved to disk. (default: :obj:`None`) force_reload (bool, optional): Whether to re-process the dataset. (default: :obj:`False`) Tip --- .. list-table:: :widths: 10 10 10 10 10 :header-rows: 1 * - Name - #nodes - #edges - #features - #classes * - Cora - 2,708 - 10,556 - 1,433 - 7 * - CiteSeer - 3,327 - 9,104 - 3,703 - 6 * - PubMed - 19,717 - 88,648 - 500 - 3 """ url = 'https://github.com/kimiyoung/planetoid/raw/master/data' def __init__(self, root: str = None, name: str = 'cora', split: str = "public", num_train_per_class: int = 20, num_val: int = 500, num_test: int = 1000, transform: Optional[Callable] = None, pre_transform: Optional[Callable] = None, force_reload: bool = False): self.name = name super().__init__(root, transform, pre_transform, force_reload = force_reload) self.data, self.slices = self.load_data(self.processed_paths[0]) self.split = split assert self.split in ['public', 'full', 'random'] if split == 'full': data = self.get(0) data.numpy() data.train_mask.fill(True) data.train_mask[data.val_mask | data.test_mask] = False data.tensor() self.data, self.slices = self.collate([data]) elif split == 'random': data = self.get(0) data.numpy() data.train_mask.fill(False) for c in range(self.num_classes): idx = np.array((data.y == c).nonzero()).reshape((-1)) idx = idx[np.random.permutation(idx.shape[0])[:num_train_per_class]] data.train_mask[idx] = True remaining = np.array((~data.train_mask).nonzero()).reshape((-1)) # remaining = (~data.train_mask).nonzero(as_tuple=False).view(-1) remaining = remaining[np.random.permutation(remaining.shape[0])] data.val_mask.fill(False) data.val_mask[remaining[:num_val]] = True data.test_mask.fill(False) data.test_mask[remaining[num_val:num_val + num_test]] = True data.tensor() self.data, self.slices = self.collate([data]) @property def raw_dir(self) -> str: return osp.join(self.root, self.name, 'raw') @property def processed_dir(self) -> str: return osp.join(self.root, self.name, 'processed') @property def raw_file_names(self) -> List[str]: names = ['x', 'tx', 'allx', 'y', 'ty', 'ally', 'graph', 'test.index'] return [f'ind.{self.name.lower()}.{name}' for name in names] @property def processed_file_names(self) -> str: return tlx.BACKEND + '_data.pt'
[docs] def download(self): for name in self.raw_file_names: download_url(f'{self.url}/{name}', self.raw_dir)
[docs] def process(self): data = read_planetoid_data(self.raw_dir, self.name) data = data if self.pre_transform is None else self.pre_transform(data) self.save_data(self.collate([data]), self.processed_paths[0])
def __repr__(self) -> str: return f'{self.name}()'