Function getSourceInputs

tfjs-layers/src/engine/topology.ts:1627–1657

(
    tensor: SymbolicTensor, layer?: Layer,
    nodeIndex?: number)

 * @return Array of input tensors.
 */
export function getSourceInputs(
    tensor: SymbolicTensor, layer?: Layer,
    nodeIndex?: number): SymbolicTensor[] {
  if (layer == null || (nodeIndex != null && nodeIndex > 0)) {
    layer = tensor.sourceLayer;
    nodeIndex = tensor.nodeIndex;
  }
  if (layer.inboundNodes.length === 0) {
    return [tensor];
  } else {
    const node = layer.inboundNodes[nodeIndex];
    if (node.inboundLayers.length === 0) {
      return node.inputTensors;
    } else {
      const sourceTensors: SymbolicTensor[] = [];
      for (let i = 0; i < node.inboundLayers.length; i++) {
        const x = node.inputTensors[i];
        const layer = node.inboundLayers[i];
        const nodeIndex = node.nodeIndices[i];
        const previousSources = getSourceInputs(x, layer, nodeIndex);
        // Avoid input redundancy.
        for (const x of previousSources) {
          if (sourceTensors.indexOf(x) === -1) {
            sourceTensors.push(x);
          }
        }
      }
      return sourceTensors;
    }
  }
}

type MaybeSymbolic = SymbolicTensor|Tensor;