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"""Ensemble backend that combines results from multiple projects""" |
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import annif.eval |
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import annif.parallel |
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import annif.suggestion |
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import annif.util |
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from annif.exception import NotSupportedException |
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from . import backend, hyperopt |
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class BaseEnsembleBackend(backend.AnnifBackend): |
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"""Base class for ensemble backends""" |
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def _get_sources_attribute(self, attr): |
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params = self._get_backend_params(None) |
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sources = annif.util.parse_sources(params["sources"]) |
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return [ |
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getattr(self.project.registry.get_project(project_id), attr) |
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for project_id, _ in sources |
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] |
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def initialize(self, parallel=False): |
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# initialize all the source projects |
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params = self._get_backend_params(None) |
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for project_id, _ in annif.util.parse_sources(params["sources"]): |
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project = self.project.registry.get_project(project_id) |
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project.initialize(parallel) |
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def _normalize_hits(self, hits, source_project): |
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"""Hook for processing hits from backends. Intended to be overridden |
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by subclasses.""" |
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return hits |
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def _suggest_with_sources(self, texts, sources): |
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hit_sets_from_sources = [] |
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for project_id, weight in sources: |
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source_project = self.project.registry.get_project(project_id) |
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hit_sets = source_project.suggest(texts) |
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norm_hit_sets = [ |
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self._normalize_hits(hits, source_project) for hits in hit_sets |
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] |
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hit_sets_from_sources.append( |
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[ |
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annif.suggestion.WeightedSuggestion( |
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hits=norm_hits, weight=weight, subjects=source_project.subjects |
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) |
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for norm_hits in norm_hit_sets |
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] |
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) |
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return hit_sets_from_sources |
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def _merge_hit_sets_from_sources(self, hit_sets_from_sources, params): |
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"""Hook for merging hits from sources. Can be overridden by |
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subclasses.""" |
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return [ |
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annif.util.merge_hits(hits, len(self.project.subjects)) |
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for hits in hit_sets_from_sources |
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] |
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def _suggest_batch(self, texts, params): |
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sources = annif.util.parse_sources(params["sources"]) |
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hit_sets_from_sources = self._suggest_with_sources(texts, sources) |
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return self._merge_hit_sets_from_sources(hit_sets_from_sources, params) |
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class EnsembleOptimizer(hyperopt.HyperparameterOptimizer): |
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"""Hyperparameter optimizer for the ensemble backend""" |
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def __init__(self, backend, corpus, metric): |
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super().__init__(backend, corpus, metric) |
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self._sources = [ |
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project_id |
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for project_id, _ in annif.util.parse_sources( |
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backend.config_params["sources"] |
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) |
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] |
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def _prepare(self, n_jobs=1): |
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self._gold_subjects = [] |
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self._source_hits = [] |
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for project_id in self._sources: |
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project = self._backend.project.registry.get_project(project_id) |
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project.initialize() |
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psmap = annif.parallel.ProjectSuggestMap( |
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self._backend.project.registry, |
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self._sources, |
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backend_params=None, |
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limit=int(self._backend.params["limit"]), |
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threshold=0.0, |
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) |
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jobs, pool_class = annif.parallel.get_pool(n_jobs) |
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with pool_class(jobs) as pool: |
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for hit_sets, subject_sets in pool.imap_unordered( |
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psmap.suggest_batch, self._corpus.doc_batches |
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): |
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self._gold_subjects.extend(subject_sets) |
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self._source_hits.extend(self._hit_sets_to_list(hit_sets)) |
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def _hit_sets_to_list(self, hit_sets): |
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"""Convert a dict of lists of hits to a list of dicts of hits, e.g. |
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{"proj-1": [p-1-doc-1-hits, p-1-doc-2-hits] |
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"proj-2": [p-2-doc-1-hits, p-2-doc-2-hits]} |
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to |
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[{"proj-1": p-1-doc-1-hits, "proj-2": p-2-doc-1-hits}, |
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{"proj-1": p-1-doc-2-hits, "proj-2": p-2-doc-2-hits}] |
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""" |
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return [ |
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dict(zip(hit_sets.keys(), doc_hits)) for doc_hits in zip(*hit_sets.values()) |
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] |
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def _normalize(self, hps): |
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total = sum(hps.values()) |
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return {source: hps[source] / total for source in hps} |
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def _format_cfg_line(self, hps): |
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return "sources=" + ",".join( |
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[f"{src}:{weight:.4f}" for src, weight in hps.items()] |
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) |
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def _objective(self, trial): |
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batch = annif.eval.EvaluationBatch(self._backend.project.subjects) |
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weights = { |
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project_id: trial.suggest_uniform(project_id, 0.0, 1.0) |
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for project_id in self._sources |
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} |
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for goldsubj, srchits in zip(self._gold_subjects, self._source_hits): |
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weighted_hits = [] |
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for project_id, hits in srchits.items(): |
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weighted_hits.append( |
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annif.suggestion.WeightedSuggestion( |
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hits=hits, |
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weight=weights[project_id], |
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subjects=self._backend.project.subjects, |
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) |
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) |
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batch.evaluate( |
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annif.util.merge_hits( |
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weighted_hits, len(self._backend.project.subjects) |
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), |
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goldsubj, |
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) |
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results = batch.results(metrics=[self._metric]) |
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return results[self._metric] |
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def _postprocess(self, study): |
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line = self._format_cfg_line(self._normalize(study.best_params)) |
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return hyperopt.HPRecommendation(lines=[line], score=study.best_value) |
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class EnsembleBackend(BaseEnsembleBackend, hyperopt.AnnifHyperoptBackend): |
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"""Ensemble backend that combines results from multiple projects""" |
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name = "ensemble" |
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@property |
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def is_trained(self): |
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sources_trained = self._get_sources_attribute("is_trained") |
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return all(sources_trained) |
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@property |
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def modification_time(self): |
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mtimes = self._get_sources_attribute("modification_time") |
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return max(filter(None, mtimes), default=None) |
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def get_hp_optimizer(self, corpus, metric): |
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return EnsembleOptimizer(self, corpus, metric) |
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def _train(self, corpus, params, jobs=0): |
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raise NotSupportedException("Training ensemble backend is not possible.") |
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NatLibFi /
Annif
