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"""Common functionality for backends.""" |
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import abc |
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import os.path |
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from datetime import datetime, timezone |
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from glob import glob |
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from annif import logger |
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class AnnifBackend(metaclass=abc.ABCMeta): |
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"""Base class for Annif backends that perform analysis. The |
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non-implemented methods should be overridden in subclasses.""" |
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name = None |
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needs_subject_index = False |
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DEFAULT_PARAMETERS = {'limit': 100} |
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def __init__(self, backend_id, config_params, project): |
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"""Initialize backend with specific parameters. The |
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parameters are a dict. Keys and values depend on the specific |
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backend type.""" |
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self.backend_id = backend_id |
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self.config_params = config_params |
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self.project = project |
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self.datadir = project.datadir |
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def default_params(self): |
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return self.DEFAULT_PARAMETERS |
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@property |
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def params(self): |
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params = {} |
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params.update(self.default_params()) |
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params.update(self.config_params) |
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return params |
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@property |
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def is_trained(self): |
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return bool(glob(os.path.join(self.datadir, '*'))) |
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@property |
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def modification_time(self): |
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mtimes = [datetime.utcfromtimestamp(os.path.getmtime(p)) |
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for p in glob(os.path.join(self.datadir, '*'))] |
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most_recent = max(mtimes, default=None) |
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if most_recent is None: |
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return None |
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return most_recent.replace(tzinfo=timezone.utc) |
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def _get_backend_params(self, params): |
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backend_params = dict(self.params) |
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if params is not None: |
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backend_params.update(params) |
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return backend_params |
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def _train(self, corpus, params): |
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"""This method can be overridden by backends. It implements |
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the train functionality, with pre-processed parameters.""" |
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pass # default is to do nothing, subclasses may override |
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def train(self, corpus, params=None): |
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"""Train the model on the given document or subject corpus.""" |
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beparams = self._get_backend_params(params) |
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return self._train(corpus, params=beparams) |
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def initialize(self): |
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"""This method can be overridden by backends. It should cause the |
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backend to pre-load all data it needs during operation.""" |
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pass |
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@abc.abstractmethod |
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def _suggest(self, text, params): |
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"""This method should implemented by backends. It implements |
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the suggest functionality, with pre-processed parameters.""" |
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pass # pragma: no cover |
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def suggest(self, text, params=None): |
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"""Suggest subjects for the input text and return a list of subjects |
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represented as a list of SubjectSuggestion objects.""" |
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beparams = self._get_backend_params(params) |
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self.initialize() |
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return self._suggest(text, params=beparams) |
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def debug(self, message): |
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"""Log a debug message from this backend""" |
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logger.debug("Backend {}: {}".format(self.backend_id, message)) |
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def info(self, message): |
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"""Log an info message from this backend""" |
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logger.info("Backend {}: {}".format(self.backend_id, message)) |
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def warning(self, message): |
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"""Log a warning message from this backend""" |
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logger.warning("Backend {}: {}".format(self.backend_id, message)) |
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class AnnifLearningBackend(AnnifBackend): |
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"""Base class for Annif backends that can perform online learning""" |
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@abc.abstractmethod |
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def _learn(self, corpus, params): |
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"""This method should implemented by backends. It implements the learn |
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functionality, with pre-processed parameters.""" |
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pass # pragma: no cover |
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def learn(self, corpus, params=None): |
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"""Further train the model on the given document or subject corpus.""" |
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beparams = self._get_backend_params(params) |
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return self._learn(corpus, params=beparams) |
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NatLibFi /
Annif
