function layoutSankey(nodes, edges, nodeWidth, nodeGap, width, height, iterations) {
	        computeNodeBreadths(nodes, nodeWidth, width);
	        computeNodeDepths(nodes, edges, height, nodeGap, iterations);
	        computeEdgeDepths(nodes);
	    }
Change the y-position of the nodes, except most the left side nodes

@param {Array.<Array.<module:echarts/data/Graph~Node>>} nodesByBreadth
    group by the array of all sankey nodes based on the node x-position.
@param {number} alpha  parameter used to adjust the nodes y-position