Source code for torch_geometric.transforms.to_sparse_tensor

from typing import Optional, Union

from torch_sparse import SparseTensor

from import Data, HeteroData
from torch_geometric.transforms import BaseTransform
from torch_geometric.utils import sort_edge_index

[docs]class ToSparseTensor(BaseTransform): r"""Converts the :obj:`edge_index` attributes of a homogeneous or heterogeneous data object into a (transposed) :class:`torch_sparse.SparseTensor` type with key :obj:`adj_.t`. .. note:: In case of composing multiple transforms, it is best to convert the :obj:`data` object to a :obj:`SparseTensor` as late as possible, since there exist some transforms that are only able to operate on :obj:`data.edge_index` for now. Args: attr: (str, optional): The name of the attribute to add as a value to the :class:`~torch_sparse.SparseTensor` object (if present). (default: :obj:`edge_weight`) remove_edge_index (bool, optional): If set to :obj:`False`, the :obj:`edge_index` tensor will not be removed. (default: :obj:`True`) fill_cache (bool, optional): If set to :obj:`False`, will not fill the underlying :obj:`SparseTensor` cache. (default: :obj:`True`) """ def __init__(self, attr: Optional[str] = 'edge_weight', remove_edge_index: bool = True, fill_cache: bool = True): self.attr = attr self.remove_edge_index = remove_edge_index self.fill_cache = fill_cache def __call__(self, data: Union[Data, HeteroData]): for store in data.edge_stores: if 'edge_index' not in store: continue keys, values = [], [] for key, value in store.items(): if key == 'edge_index': continue if store.is_edge_attr(key): keys.append(key) values.append(value) store.edge_index, values = sort_edge_index(store.edge_index, values, sort_by_row=False) for key, value in zip(keys, values): store[key] = value store.adj_t = SparseTensor( row=store.edge_index[1], col=store.edge_index[0], value=None if self.attr is None or self.attr not in store else store[self.attr], sparse_sizes=store.size()[::-1], is_sorted=True) if self.remove_edge_index: del store['edge_index'] if self.attr is not None and self.attr in store: del store[self.attr] if self.fill_cache: # Pre-process some important attributes. return data def __repr__(self) -> str: return f'{self.__class__.__name__}()'