deqingli commented on issue #6555: Browser become unresponsive when sankey 
chart is generated with specific data
   Hello @lisachristina1234, this problem is caused by the existence of cycles 
in the original input data. The sankey diagram theoretically only supports 
Directed Acyclic Graph (DAG), so the former layout algorithm treats input data 
as the directed acyclic graph as default, when there is a cycle, it fall into 
an infinite loop. The modified layout algorithm will traverse the node to 
calculate the layout in topological order. If the cycle is judged, it will 
report an error and will not be drawn.

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