# TransR¶

Bases: torch.nn.modules.module.Module

Similarity measure from Learning entity and relation embeddings for knowledge graph completion

Mathematically, it is defined as follows:

$- {\| M_r h + r - M_r t \|}_p$

where $$M_r$$ is a relation-specific projection matrix, $$h$$ is the head embedding, $$r$$ is the relation embedding, and $$t$$ is the tail embedding.

Parameters
• num_rels (int) – Number of relation types.

• rfeats (int) – Relation embedding size.

• nfeats (int) – Entity embedding size.

• p (int, optional) – The p to use for Lp norm, which can be 1 or 2.

rel_emb

The learnable relation type embedding.

Type

torch.nn.Embedding

rel_project

The learnable relation-type-specific projection.

Type

torch.nn.Embedding

Examples

>>> import dgl
>>> import torch as th
>>> from dgl.nn import TransR
>>> # input features
>>> num_nodes = 10
>>> num_edges = 30
>>> num_rels = 3
>>> feats = 4
>>> scorer = TransR(num_rels=num_rels, rfeats=2, nfeats=feats)
>>> g = dgl.rand_graph(num_nodes=num_nodes, num_edges=num_edges)
>>> src, dst = g.edges()
>>> h = th.randn(num_nodes, feats)
>>> h_tail = h[dst]
>>> # Randomly initialize edge relation types for demonstration
>>> rels = th.randint(low=0, high=num_rels, size=(num_edges,))
torch.Size([30])

Score triples.

Parameters
• h_head (torch.Tensor) – Head entity features. The tensor is of shape $$(E, D)$$, where $$E$$ is the number of triples, and $$D$$ is the feature size.

• h_tail (torch.Tensor) – Tail entity features. The tensor is of shape $$(E, D)$$, where $$E$$ is the number of triples, and $$D$$ is the feature size.

• rels (torch.Tensor) – Relation types. It is a LongTensor of shape $$(E)$$, where $$E$$ is the number of triples.

Returns

The triple scores. The tensor is of shape $$(E)$$.

Return type

torch.Tensor

reset_parameters()[source]

Reinitialize learnable parameters.