Edges - Connections

Once the nodes, \(V\), are defined, you can create the edges, \(E\), that will connect them. These connections are listed in the edges section of the recipe file, and they are created independently for each (source name, target name) pair specified.

edges:
  - source_name: data
    target_name: hidden
    edge_builders:
    - _target_: anemoi.graphs.edges.CutOffEdges
      cutoff_factor: 0.7

Below are the available methods for defining the edges:

• Cut-off radius
• K-Nearest Neighbours
• Multi-scale connections at refined icosahedron

Additionally, there are 2 extra arguments (source_mask_attr_name and target_mask_attr_name) that can be used in the edge configuration to mask source and/or target nodes. This can be useful to different use cases, such as Limited Area Modeling (LAM) where your decoder edges should only connect to the nodes in the limited area.

edges:
  - source_name: hidden
    target_name: data
    edge_builders:
    - _target_: anemoi.graphs.edges.KNNEdges
      num_nearest_neighbours: 5
      target_mask_attr_name: cutout