{"record":{"id":"211cada23e357ae2","repo":"mem0ai/mem0","slug":"could-not-import-reranker-for-provider-provider","errorCode":null,"errorMessage":"Could not import reranker for provider '{provider_name}': {e}","messagePattern":"Could not import reranker for provider '(.+?)': (.+?)","errorType":"exception","errorClass":"ImportError","httpStatus":null,"severity":"error","filePath":"mem0/utils/factory.py","lineNumber":278,"sourceCode":"        \"\"\"\n        if provider_name not in cls.provider_to_class:\n            raise ValueError(f\"Unsupported reranker provider: {provider_name}\")\n\n        class_path, config_class = cls.provider_to_class[provider_name]\n\n        # Handle configuration\n        if config is None:\n            config = config_class(**kwargs)\n        elif isinstance(config, dict):\n            config = config_class(**config, **kwargs)\n        elif not isinstance(config, BaseRerankerConfig):\n            raise ValueError(f\"Config must be a {config_class.__name__} instance or dict\")\n\n        # Import and create the reranker class\n        try:\n            reranker_class = load_class(class_path)\n        except (ImportError, AttributeError) as e:\n            raise ImportError(f\"Could not import reranker for provider '{provider_name}': {e}\")\n\n        return reranker_class(config)\n","sourceCodeStart":260,"sourceCodeEnd":281,"githubUrl":"https://github.com/mem0ai/mem0/blob/001c235229be8795e3834520467bd0d661ed8f34/mem0/utils/factory.py#L260-L281","documentation":"Raised by RerankerFactory.create when dynamic import of the provider's reranker class via load_class(class_path) raises ImportError or AttributeError — i.e. the module mem0.reranker.<provider>_reranker cannot be imported (missing optional dependency) or the class attribute does not exist in it. The original exception text is appended, so the message tells you exactly which import failed.","triggerScenarios":"Selecting 'huggingface' or 'sentence_transformer' rerankers without sentence-transformers/torch installed; selecting 'cohere' without the cohere SDK installed; a broken/partial mem0 install where mem0.reranker.* modules are missing; a version mismatch where the class was renamed.","commonSituations":"Installing bare mem0ai without optional extras then enabling reranking; a venv truncated mid-install; upgrading mem0ai while old compiled deps (torch) are missing on the new Python version.","solutions":["Read the appended original error: it names the module/package that failed to import and install that package (e.g. pip install cohere or pip install sentence-transformers)","Reinstall mem0ai cleanly: pip install --force-reinstall mem0ai to restore mem0.reranker modules","Verify the class path resolves: from mem0.reranker.cohere_reranker import CohereReranker","Pin a known-good mem0ai version if a recent upgrade broke the import"],"exampleFix":"# before (ImportError: Could not import reranker ... No module named 'cohere')\nreranker = RerankerFactory.create('cohere', config={'api_key': key})\n\n# after\n# pip install cohere\nreranker = RerankerFactory.create('cohere', config={'api_key': key})","handlingStrategy":"validation","validationCode":"import importlib.util\nMISSING = [m for m in ('cohere',) if importlib.util.find_spec(m) is None]\nif MISSING and cfg.get('reranker', {}).get('provider') == 'cohere':\n    raise ConfigError(f'install reranker deps first: {MISSING}')","typeGuard":"def reranker_deps_available(provider: str) -> bool:\n    import importlib.util\n    need = {'cohere': ['cohere'], 'sentence_transformer': ['sentence_transformers'], 'huggingface': ['sentence_transformers']}\n    return all(importlib.util.find_spec(m) for m in need.get(provider, []))","tryCatchPattern":"try:\n    reranker = RerankerFactory.create(provider, config)\nexcept ImportError as e:\n    if 'Could not import reranker' in str(e):\n        log.error('optional dependency missing for %s: %s', provider, e)\n        raise\n    raise","preventionTips":["Install optional reranker SDKs alongside mem0ai in the same requirements file","Smoke-test factory.create for each configured provider at deploy time","Pin dependency versions so imports do not drift"],"tags":["dependencies","reranker","import","installation"],"backgroundTag":null,"analyzedSha":"001c235229be8795e3834520467bd0d661ed8f34","analyzedAt":"2026-08-15T01:55:42.685Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}