What does a single "||" mean in pytorch-geometric documents?
For example the &quot;||&quot; (\Vert) in https://pytorch-geometric.readthedocs.io/en/latest/modules/nn.html#torch_geometric.nn.conv.GATConv

That documentation page includes a link to an arxiv paper that includes the following (bottom of page three)...


where  represents transposition and || is the concatenation operation.

So yes, || is the concatenation operator.
