torch_geometric.nn.aggr.MLPAggregation

class MLPAggregation(in_channels: int, out_channels: int, max_num_elements: int, **kwargs)[source]

Bases: Aggregation

执行MLP聚合，其中要聚合的元素被展平为单个向量表示，然后通过多层感知器（MLP）进行处理，如“具有自适应读数的图神经网络”论文中所述。

注意

MLPAggregation 需要排序后的索引 index 作为输入。 具体来说，如果你将此聚合作为 MessagePassing 的一部分使用，请确保 edge_index 按目标节点排序，可以通过手动 使用 sort_edge_index() 排序边索引 或调用 torch_geometric.data.Data.sort() 来实现。

警告

MLPAggregation 不是一个排列不变的运算符。

Parameters:

  • in_channels (int) – Size of each input sample.

  • out_channels (int) – Size of each output sample.

  • max_num_elements (int) – 每个组中要聚合的最大元素数量。

  • **kwargs (可选) – torch_geometric.nn.models.MLP 的额外参数。

reset_parameters()[source]

重置模块的所有可学习参数。

forward(x: Tensor, index: Optional[Tensor] = None, ptr: Optional[Tensor] = None, dim_size: Optional[int] = None, dim: int = -2) → Tensor[source]

前向传播。

Parameters:

  • x (torch.Tensor) – The source tensor.

  • index (torch.Tensor, optional) – The indices of elements for applying the aggregation. One of index or ptr must be defined. (default: None)

  • ptr (torch.Tensor, optional) – If given, computes the aggregation based on sorted inputs in CSR representation. One of index or ptr must be defined. (default: None)

  • dim_size (int, optional) – The size of the output tensor at dimension dim after aggregation. (default: None)

  • dim (int, optional) – The dimension in which to aggregate. (default: -2)

  • max_num_elements – (int, optional): The maximum number of elements within a single aggregation group. (default: None)

Return type:

Tensor