spaCy/spacy/pipeline/_parser_internals/nonproj.pxd
kadarakos 1bb87f35bc
Detect cycle during projectivize (#10877)
* detect cycle during projectivize

* not complete test to detect cycle in projectivize

* boolean to int type to propagate error

* use unordered_set instead of set

* moved error message to errors

* removed cycle from test case

* use find instead of count

* cycle check: only perform one lookup

* Return bool again from _has_head_as_ancestor

Communicate presence of cycles through an output argument.

* Switch to returning std::pair to encode presence of a cycle

The has_cycle pointer is too easy to misuse. Ideally, we would have a
sum type like Rust's `Result` here, but C++ is not there yet.

* _is_non_proj_arc: clarify what we are returning

* _has_head_as_ancestor: remove count

We are now explicitly checking for cycles, so the algorithm must always
terminate. Either we encounter the head, we find a root, or a cycle.

* _is_nonproj_arc: simplify condition

* Another refactor using C++ exceptions

* Remove unused error code

* Print graph with cycle on exception

* Include .hh files in source package

* Add FIXME comment

* cycle detection test

* find cycle when starting from problematic vertex

Co-authored-by: Daniël de Kok <me@danieldk.eu>
2022-06-08 19:34:11 +02:00

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Cython

from libcpp.string cimport string
cdef extern from "nonproj.hh":
cdef void raise_domain_error(const string& msg) nogil except +