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Replace Sugraph #538

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mb706 opened this issue Nov 5, 2020 · 6 comments · May be fixed by #560
Open

Replace Sugraph #538

mb706 opened this issue Nov 5, 2020 · 6 comments · May be fixed by #560
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@sumny
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Status: Needs Design Needs some thought and design decisions.

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@mb706
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mb706 commented Nov 5, 2020

A potentially useful operation on a Graph would be to replace a PipeOp, or an entire subgraph, with a different Graph. With this, one could "edit" the result of a ppl() call, for example, if the pipeline happens to have a single / very few pipeops that are different than what would be desired. Currenlty the user would have to edit the connection table to do this, which may be a bit tedious.

Suggested UI for this would be Graph$replace_subgraph(ids, substitute), substitute being something that can be turned into a graph using as_graph. The operation would remove ids from the graph, and do the equivalent of <channels into ids> %>>% substitute %>>% <channels out of ids> inside the graph (This would entail automatic one-to-many and vararg channel handling, as well as type checking).
@sumny sumny self-assigned this Nov 6, 2020
@mb706
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mb706 commented Dec 4, 2020 •
edited

Which (newly free) output channels to connect to new graph, and in what order?

  • take original graph, remember output_orig as the entire graph's output channels (graph$output)
  • delete IDs of pipeops that are being cut out, and remove their edges (obvsly)
  • look what new graph$output channels there are. Set-subtract output_orig from these
  • use these output channels & this order to connect to new graph
  • should be in-place

@mb706
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mb706 commented Dec 4, 2020

we want a complementary function that gives us the IDs of all pipeops that are "between" two (or more) pipeops.

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mb706 commented Dec 4, 2020

edge cases to watch out for: entire graph, beginning of graph, end of graph

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mb706 commented Dec 4, 2020

vararg will be difficult...

@mb706
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mb706 commented Dec 4, 2020

should work the same as %>>% I would say

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mb706 commented Dec 4, 2020 •
edited

Also $remove_pipeop() which removes edges and updates param_set

@sumny sumny linked a pull request Jan 31, 2021 that will close this issue
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@mb706 mb706 added the Status: Needs Design Needs some thought and design decisions. label Sep 29, 2021
@mb706 mb706 mentioned this issue Sep 26, 2022
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Replace subgraph mlr-org/mlr3pipelines
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