Returns whether the graph is acyclic. The property returns true if the graph is acyclic (has no cycles), false otherwise.
A graph is not acyclic when there is at least one cycle or loop in the graph, where you can start at a node and traverse edges and eventually get back to your starting node (for example, node 1 to node 2 to node 3 to node 1). Note that an undirected graph (where edges do not have a direction) always have cycles.
The Acyclic property uses the TopologicalOrder method to determine if a graph has cycles. If a topological order can be found (i.e., nothing is a prerequisite of itself, a cycle), the Acyclic property returns True.
 Note
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This property is cached because of the expense of determining a topological ordering. Until you change the graph again, the property will be cached and directly return the value.
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 Warning
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Do not check this property inside a BeginUpdateNodes/EndUpdateNodes block. The BeginUpdate prevents the node from informing the graph that it is changing. The cached value of the Acyclic property will be returned until the block is left.
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