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Black Transitions in Petri net Model
I have an event log and I have been trying to process discovery with this log in ProM 6.9. Firstly I used "Alpha Miner" but the process seems like below even if A placed before D and H placed before J activities in the event log. It did not show the connection between them.
Then I used "Mine Petri net with Inductive Miner" and it generated a more sensible process model below. But, at this time, it generated 3 transition elements which are not placed in event logs. When I look at the .pnml file generated to check the difference, there were 3 transitions that look like the transition below. They not filled with "#FFFFFF" color and their activity properties equal to "$invisible". Also, their name information was kind of "tau join", "tau split", etc.
Also, the BPMN format, which I converted in ProM, of the process above seems like below. In there, I believe that there must be a Parallel Gateway after activity A where I drew. Activity A must be connected to B, D, and E activities on this Gateway.
My questions are;
- What is the possible reason for the "Alpha Miner" to ignore the connection?
- What are these black transitions and Why do they generate?
- Must any Parallel Gateway be placed as I drew at last BPMN Diagram? It is about the implementation of the conversation algorithm I used or being more than 2 activities after activity A.