text: """This file is part of https://github.com/pyg-team/pytorch_geometric
  Copyright (c) 2021 Matthias Fey, Jiaxuan You <matthias.fey@tu-dortmund.de, jiaxuan@cs.stanford.edu>
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
  """
  
  import os
  import os.path as osp
  
  import torch
  from torch_geometric.data import InMemoryDataset, Data, download_url
  
  
  class KG(InMemoryDataset):
      def __init__(self, root, name, transform=None, pre_transform=None):
          self.name = name
          super().__init__(root, transform, pre_transform)
          self.data, self.slices = torch.load(self.processed_paths[0])
  
      @property
      def num_relations(self):
          return int(self.data.edge_type.max()) + 1
  
      @property
      def raw_dir(self):
          return os.path.join(self.root, self.name, 'raw')
  
      @property
      def processed_dir(self):
          return os.path.join(self.root, self.name, 'processed')
  
      @property
      def processed_file_names(self):
          return 'data.pt'
  
      @property
      def raw_file_names(self):
          return [
              'entities.dict', 'relations.dict', 'test.txt', 'train.txt',
              'valid.txt'
          ]
  
      def download(self):
          url = 'https://github.com/MichSchli/RelationPrediction/tree/master/data/'
          urls = {
              'fb15k': url + 'FB15k',
              'fb15k-237': url + 'FB-Toutanova',
              'wn18': url + 'wn18',
              'toy': url + 'Toy'
          }
          for file_name in self.raw_file_names:
              download_url(f'{urls[self.name]}/{file_name}', self.raw_dir)
  
      def process(self):
          with open(osp.join(self.raw_dir, 'entities.dict'), 'r') as f:
              lines = [row.split('\t') for row in f.read().split('\n')[:-1]]
              entities_dict = {key: int(value) for value, key in lines}
  
          with open(osp.join(self.raw_dir, 'relations.dict'), 'r') as f:
              lines = [row.split('\t') for row in f.read().split('\n')[:-1]]
              relations_dict = {key: int(value) for value, key in lines}
  
          kwargs = {}
          for split in ['train', 'valid', 'test']:
              with open(osp.join(self.raw_dir, f'{split}.txt'), 'r') as f:
                  lines = [row.split('\t') for row in f.read().split('\n')[:-1]]
                  src = [entities_dict[row[0]] for row in lines]
                  rel = [relations_dict[row[1]] for row in lines]
                  dst = [entities_dict[row[2]] for row in lines]
                  kwargs[f'{split}_edge_index'] = torch.tensor([src, dst])
                  kwargs[f'{split}_edge_type'] = torch.tensor(rel)
  
          # For message passing, we add reverse edges and types to the graph:
          row, col = kwargs['train_edge_index']
          edge_type = kwargs['train_edge_type']
          row, col = torch.cat([row, col], dim=0), torch.cat([col, row], dim=0)
          edge_index = torch.stack([row, col], dim=0)
          edge_type = torch.cat([edge_type, edge_type + len(relations_dict)])
          num_nodes = len(entities_dict)
          data = Data(num_nodes=num_nodes,
                      edge_index=edge_index,
                      edge_type=edge_type,
                      **kwargs)
          edge_index = torch.cat((data.train_edge_index, data.valid_edge_index,
                                  data.test_edge_index),
                                 dim=-1)
          edge_type = torch.cat(
              (data.train_edge_type, data.valid_edge_type, data.test_edge_type),
              dim=0)
          num_edges = edge_index.size(-1)
          train_edge_mask = torch.zeros(num_edges, dtype=torch.bool)
          train_edge_mask[:data.train_edge_index.size(-1)] = True
          valid_edge_mask = torch.zeros(num_edges, dtype=torch.bool)
          valid_edge_mask[data.train_edge_index.
                          size(-1):-data.test_edge_index.size(-1)] = True
          test_edge_mask = torch.zeros(num_edges, dtype=torch.bool)
          test_edge_mask[-data.test_edge_index.size(-1):] = True
          data = Data(edge_index=edge_index,
                      index_orig=torch.arange(num_nodes),
                      edge_type=edge_type,
                      num_nodes=num_nodes,
                      train_edge_mask=train_edge_mask,
                      valid_edge_mask=valid_edge_mask,
                      test_edge_mask=test_edge_mask,
                      input_edge_index=data.edge_index)
  
          data_list = [data]
          if self.pre_filter is not None:
              data_list = [data for data in data_list if self.pre_filter(data)]
  
          if self.pre_transform is not None:
              data_list = [self.pre_transform(data) for data in data_list]
  
          torch.save((self.collate([data])), self.processed_paths[0])