Add recursive lookup for better ensemble disconnectivity reporting

[GuanLuo]

No description provided.

[dyastremsky]

Nice change! Very clean.

Approved your related tests here too: triton-inference-server/server#6149

[oandreeva-nv]

LGTM, thanks! I am curious, if this is an issue, then would it make sense to provide a sanity check tool for ensembles ?

[GuanLuo]

I think we could, it is relatively easy to extract the static checking part of the ensemble config.

[dyastremsky]

I think we could, it is relatively easy to extract the static checking part of the ensemble config.

It might even be valuable to provide some sort of visualization tool as part of this. Like one that shows a visual representation of the graph produced by Triton for the ensemble. This might be less trivial, but there are likely libraries that could make this easier.

[oandreeva-nv]

I would be interested in implementing this

[rmccorm4]

I believe the developer of Netron is quite open to contribution/collaboration, and we use it often for ONNX and some TensorRT stuff - it might be worth adding a config as an acceptable format.