ContractionTree.branch_info() returns empty list when slicing is applied

[alibaba]

ContractionTree.branch_info() returns empty list when slicing is applied

[cupjinhuang]

Hello ChienKaiMa,

Thanks for pointing out this issue. The problem might not be directly related to the number of open indices, but is more likely due to a tensor network structure that triggered some corner case in the program.

Could you please provide the file entanglement_30.txt that reproduces this error?

Cupjin

[ChienKaiMa]

I have difficulties attaching files right here, so I forked the repository and committed the modified code and circuit files in use in ChienKaiMa@fce402e

[cupjinhuang]

Hello @ChienKaiMa,

I have changed the logic such that the corresponding optimization is not performed in such cases in order not to raise the error.

Please let me know if this helps.

Cupjin