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"""Registry of backend types for Annif""" |
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from __future__ import annotations |
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from typing import TYPE_CHECKING, Type |
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if TYPE_CHECKING: |
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from annif.backend.backend import AnnifBackend |
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# define functions for lazily importing each backend (alphabetical order) |
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def _dummy() -> Type[AnnifBackend]: |
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from . import dummy |
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return dummy.DummyBackend |
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def _ensemble() -> Type[AnnifBackend]: |
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from . import ensemble |
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return ensemble.EnsembleBackend |
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def _fasttext() -> Type[AnnifBackend]: |
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try: |
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from . import fasttext |
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return fasttext.FastTextBackend |
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except ImportError: |
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raise ValueError("fastText not available, cannot use fasttext backend") |
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def _http() -> Type[AnnifBackend]: |
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from . import http |
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return http.HTTPBackend |
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def _mllm() -> Type[AnnifBackend]: |
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from . import mllm |
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return mllm.MLLMBackend |
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def _nn_ensemble() -> Type[AnnifBackend]: |
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try: |
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from . import nn_ensemble |
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return nn_ensemble.NNEnsembleBackend |
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except ImportError: |
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raise ValueError( |
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"Keras and TensorFlow not available, cannot use " + "nn_ensemble backend" |
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) |
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def _omikuji() -> Type[AnnifBackend]: |
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try: |
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from . import omikuji |
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return omikuji.OmikujiBackend |
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except ImportError: |
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raise ValueError("Omikuji not available, cannot use omikuji backend") |
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def _pav() -> Type[AnnifBackend]: |
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from . import pav |
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return pav.PAVBackend |
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def _stwfsa() -> Type[AnnifBackend]: |
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try: |
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from . import stwfsa |
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return stwfsa.StwfsaBackend |
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except ImportError: |
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raise ValueError("STWFSA not available, cannot use stwfsa backend") |
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def _svc() -> Type[AnnifBackend]: |
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from . import svc |
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return svc.SVCBackend |
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def _tfidf() -> Type[AnnifBackend]: |
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from . import tfidf |
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return tfidf.TFIDFBackend |
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def _yake() -> Type[AnnifBackend]: |
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try: |
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from . import yake |
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return yake.YakeBackend |
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except ImportError: |
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raise ValueError("YAKE not available, cannot use yake backend") |
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# registry of the above functions |
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_backend_fns = { |
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"dummy": _dummy, |
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"ensemble": _ensemble, |
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"fasttext": _fasttext, |
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"http": _http, |
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"mllm": _mllm, |
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"nn_ensemble": _nn_ensemble, |
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"omikuji": _omikuji, |
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"pav": _pav, |
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"stwfsa": _stwfsa, |
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"svc": _svc, |
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"tfidf": _tfidf, |
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"yake": _yake, |
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} |
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def get_backend(backend_id: str) -> Type[AnnifBackend]: |
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if backend_id in _backend_fns: |
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return _backend_fns[backend_id]() |
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else: |
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raise ValueError("No such backend type {}".format(backend_id)) |
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NatLibFi /
Annif
