{
  "id": "lightgcn",
  "name": "LightGCN",
  "description": "He et al. 2020 — user/item embeddings propagated through 3 light graph-conv layers, layer combination via mean, dot-product score (no transforms, no nonlinearities)",
  "icon": "💡",
  "category": "Recommendation",
  "components": [
    { "id": "in-user", "type": "input", "name": "User ID", "position": { "x": 80, "y": 60 }, "params": { "shape": [1] }, "inputs": [], "outputs": [] },
    { "id": "user-e0", "type": "embedding", "name": "E_user(0)", "scope": "user_tower", "position": { "x": 80, "y": 200 }, "params": { "vocabSize": 100000, "embeddingDim": 64 }, "inputs": [], "outputs": [] },
    { "id": "user-gc1", "type": "graphConv", "name": "GraphConv(1)", "scope": "user_tower.gcn", "position": { "x": 80, "y": 340 }, "params": { "inFeatures": 64, "outFeatures": 64, "useTransform": false, "useNonlinearity": false }, "inputs": [], "outputs": [] },
    { "id": "user-gc2", "type": "graphConv", "name": "GraphConv(2)", "scope": "user_tower.gcn", "position": { "x": 80, "y": 460 }, "params": { "inFeatures": 64, "outFeatures": 64, "useTransform": false, "useNonlinearity": false }, "inputs": [], "outputs": [] },
    { "id": "user-gc3", "type": "graphConv", "name": "GraphConv(3)", "scope": "user_tower.gcn", "position": { "x": 80, "y": 580 }, "params": { "inFeatures": 64, "outFeatures": 64, "useTransform": false, "useNonlinearity": false }, "inputs": [], "outputs": [] },
    { "id": "user-mean", "type": "mean", "name": "Layer Combine (mean)", "scope": "user_tower", "position": { "x": 80, "y": 720 }, "params": { "dim": 0, "numInputs": 4 }, "inputs": [], "outputs": [] },

    { "id": "in-item", "type": "input", "name": "Item ID", "position": { "x": 420, "y": 60 }, "params": { "shape": [1] }, "inputs": [], "outputs": [] },
    { "id": "item-e0", "type": "embedding", "name": "E_item(0)", "scope": "item_tower", "position": { "x": 420, "y": 200 }, "params": { "vocabSize": 1000000, "embeddingDim": 64 }, "inputs": [], "outputs": [] },
    { "id": "item-gc1", "type": "graphConv", "name": "GraphConv(1)", "scope": "item_tower.gcn", "position": { "x": 420, "y": 340 }, "params": { "inFeatures": 64, "outFeatures": 64, "useTransform": false, "useNonlinearity": false }, "inputs": [], "outputs": [] },
    { "id": "item-gc2", "type": "graphConv", "name": "GraphConv(2)", "scope": "item_tower.gcn", "position": { "x": 420, "y": 460 }, "params": { "inFeatures": 64, "outFeatures": 64, "useTransform": false, "useNonlinearity": false }, "inputs": [], "outputs": [] },
    { "id": "item-gc3", "type": "graphConv", "name": "GraphConv(3)", "scope": "item_tower.gcn", "position": { "x": 420, "y": 580 }, "params": { "inFeatures": 64, "outFeatures": 64, "useTransform": false, "useNonlinearity": false }, "inputs": [], "outputs": [] },
    { "id": "item-mean", "type": "mean", "name": "Layer Combine (mean)", "scope": "item_tower", "position": { "x": 420, "y": 720 }, "params": { "dim": 0, "numInputs": 4 }, "inputs": [], "outputs": [] },

    { "id": "dot", "type": "matmul", "name": "Dot Score", "position": { "x": 250, "y": 860 }, "params": {}, "inputs": [], "outputs": [] },
    { "id": "out", "type": "output", "name": "Score", "position": { "x": 250, "y": 980 }, "params": {}, "inputs": [], "outputs": [] }
  ],
  "connections": [
    { "id": "u1", "from": "in-user", "to": "user-e0", "fromPort": "bottom", "toPort": "top" },
    { "id": "u2", "from": "user-e0", "to": "user-gc1", "fromPort": "bottom", "toPort": "top" },
    { "id": "u3", "from": "user-gc1", "to": "user-gc2", "fromPort": "bottom", "toPort": "top" },
    { "id": "u4", "from": "user-gc2", "to": "user-gc3", "fromPort": "bottom", "toPort": "top" },
    { "id": "u5", "from": "user-e0", "to": "user-mean", "fromPort": "right", "toPort": "left" },
    { "id": "u6", "from": "user-gc1", "to": "user-mean", "fromPort": "right", "toPort": "left" },
    { "id": "u7", "from": "user-gc2", "to": "user-mean", "fromPort": "right", "toPort": "left" },
    { "id": "u8", "from": "user-gc3", "to": "user-mean", "fromPort": "bottom", "toPort": "top" },

    { "id": "i1", "from": "in-item", "to": "item-e0", "fromPort": "bottom", "toPort": "top" },
    { "id": "i2", "from": "item-e0", "to": "item-gc1", "fromPort": "bottom", "toPort": "top" },
    { "id": "i3", "from": "item-gc1", "to": "item-gc2", "fromPort": "bottom", "toPort": "top" },
    { "id": "i4", "from": "item-gc2", "to": "item-gc3", "fromPort": "bottom", "toPort": "top" },
    { "id": "i5", "from": "item-e0", "to": "item-mean", "fromPort": "left", "toPort": "right" },
    { "id": "i6", "from": "item-gc1", "to": "item-mean", "fromPort": "left", "toPort": "right" },
    { "id": "i7", "from": "item-gc2", "to": "item-mean", "fromPort": "left", "toPort": "right" },
    { "id": "i8", "from": "item-gc3", "to": "item-mean", "fromPort": "bottom", "toPort": "top" },

    { "id": "s1", "from": "user-mean", "to": "dot", "fromPort": "bottom", "toPort": "left" },
    { "id": "s2", "from": "item-mean", "to": "dot", "fromPort": "bottom", "toPort": "right" },
    { "id": "s3", "from": "dot", "to": "out", "fromPort": "bottom", "toPort": "top" }
  ]
}