{
  "id": "ncf",
  "name": "Neural Collaborative Filtering",
  "description": "He et al. 2017 NCF — user/item embeddings → concat → MLP → score (concat-then-MLP variant, distinct from NeuMF fusion)",
  "icon": "🧮",
  "category": "Recommendation",
  "components": [
    { "id": "in-user", "type": "input", "name": "User ID", "position": { "x": 80, "y": 60 }, "params": { "shape": [1] }, "inputs": [], "outputs": [] },
    { "id": "user-emb", "type": "embedding", "name": "User Embedding", "scope": "user_tower", "position": { "x": 80, "y": 200 }, "params": { "vocabSize": 100000, "embeddingDim": 32 }, "inputs": [], "outputs": [] },

    { "id": "in-item", "type": "input", "name": "Item ID", "position": { "x": 360, "y": 60 }, "params": { "shape": [1] }, "inputs": [], "outputs": [] },
    { "id": "item-emb", "type": "embedding", "name": "Item Embedding", "scope": "item_tower", "position": { "x": 360, "y": 200 }, "params": { "vocabSize": 1000000, "embeddingDim": 32 }, "inputs": [], "outputs": [] },

    { "id": "concat", "type": "concatenate", "name": "Concat [u; i]", "scope": "mlp", "position": { "x": 220, "y": 340 }, "params": { "dim": -1, "numInputs": 2 }, "inputs": [], "outputs": [] },
    { "id": "fc1", "type": "linear", "name": "MLP 1", "scope": "mlp", "position": { "x": 220, "y": 460 }, "params": { "inFeatures": 64, "outFeatures": 64 }, "inputs": [], "outputs": [] },
    { "id": "act1", "type": "relu", "name": "ReLU 1", "scope": "mlp", "position": { "x": 220, "y": 560 }, "params": {}, "inputs": [], "outputs": [] },
    { "id": "fc2", "type": "linear", "name": "MLP 2", "scope": "mlp", "position": { "x": 220, "y": 660 }, "params": { "inFeatures": 64, "outFeatures": 32 }, "inputs": [], "outputs": [] },
    { "id": "act2", "type": "relu", "name": "ReLU 2", "scope": "mlp", "position": { "x": 220, "y": 760 }, "params": {}, "inputs": [], "outputs": [] },
    { "id": "fc3", "type": "linear", "name": "Score Head", "scope": "mlp", "position": { "x": 220, "y": 860 }, "params": { "inFeatures": 32, "outFeatures": 1 }, "inputs": [], "outputs": [] },
    { "id": "sig", "type": "sigmoid", "name": "Sigmoid", "scope": "mlp", "position": { "x": 220, "y": 960 }, "params": {}, "inputs": [], "outputs": [] },
    { "id": "out", "type": "output", "name": "P(click)", "position": { "x": 220, "y": 1080 }, "params": {}, "inputs": [], "outputs": [] }
  ],
  "connections": [
    { "id": "c1", "from": "in-user", "to": "user-emb", "fromPort": "bottom", "toPort": "top" },
    { "id": "c2", "from": "in-item", "to": "item-emb", "fromPort": "bottom", "toPort": "top" },
    { "id": "c3", "from": "user-emb", "to": "concat", "fromPort": "bottom", "toPort": "left" },
    { "id": "c4", "from": "item-emb", "to": "concat", "fromPort": "bottom", "toPort": "right" },
    { "id": "c5", "from": "concat", "to": "fc1", "fromPort": "bottom", "toPort": "top" },
    { "id": "c6", "from": "fc1", "to": "act1", "fromPort": "bottom", "toPort": "top" },
    { "id": "c7", "from": "act1", "to": "fc2", "fromPort": "bottom", "toPort": "top" },
    { "id": "c8", "from": "fc2", "to": "act2", "fromPort": "bottom", "toPort": "top" },
    { "id": "c9", "from": "act2", "to": "fc3", "fromPort": "bottom", "toPort": "top" },
    { "id": "c10", "from": "fc3", "to": "sig", "fromPort": "bottom", "toPort": "top" },
    { "id": "c11", "from": "sig", "to": "out", "fromPort": "bottom", "toPort": "top" }
  ]
}