onnx.pb

graph {
  node {
    input: "X"
    input: "W"
    output: "Y"
    name: "matmult"
    op_type: "Mul"
  }
  input {
    name: "X"
    type {
      ...
    }
  }
  output {
    name: "Y"
    type {
      ...
    }
  }
}