pi_graph 0.1.5

dag interface.
docs.rs failed to build pi_graph-0.1.5
Please check the build logs for more information.
See Builds for ideas on how to fix a failed build, or Metadata for how to configure docs.rs builds.
If you believe this is docs.rs' fault, open an issue.
Visit the last successful build: pi_graph-0.2.1

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