{"record":{"id":"817e1aa3681d6ae0","repo":"keras-team/keras","slug":"sparse-true-can-only-be-used-with-the-tensorflow-817e1a","errorCode":null,"errorMessage":"`sparse=True` can only be used with the TensorFlow backend.","messagePattern":"`sparse=True` can only be used with the TensorFlow backend\\.","errorType":"validation","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"keras/src/layers/preprocessing/string_lookup.py","lineNumber":325,"sourceCode":"        oov_token=\"[UNK]\",\n        vocabulary=None,\n        idf_weights=None,\n        invert=False,\n        output_mode=\"int\",\n        pad_to_max_tokens=False,\n        sparse=False,\n        encoding=\"utf-8\",\n        name=None,\n        salt=None,\n        **kwargs,\n    ):\n        if not tf.available:\n            raise ImportError(\n                \"Layer StringLookup requires TensorFlow. \"\n                \"Install it via `pip install tensorflow`.\"\n            )\n        if sparse and backend.backend() != \"tensorflow\":\n            raise ValueError(\n                \"`sparse=True` can only be used with the TensorFlow backend.\"\n            )\n        self.encoding = encoding\n        super().__init__(\n            max_tokens=max_tokens,\n            num_oov_indices=num_oov_indices,\n            mask_token=mask_token,\n            oov_token=oov_token,\n            vocabulary=vocabulary,\n            idf_weights=idf_weights,\n            invert=invert,\n            output_mode=output_mode,\n            pad_to_max_tokens=pad_to_max_tokens,\n            sparse=sparse,\n            name=name,\n            salt=salt,\n            vocabulary_dtype=\"string\",\n            **kwargs,","sourceCodeStart":307,"sourceCodeEnd":343,"githubUrl":"https://github.com/keras-team/keras/blob/7a34a03db60bf60042242d6a556fc3be119046a5/keras/src/layers/preprocessing/string_lookup.py#L307-L343","documentation":"Error \"`sparse=True` can only be used with the TensorFlow backend.\" thrown in keras-team/keras.","triggerScenarios":"Thrown at keras/src/layers/preprocessing/string_lookup.py:325 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"7a34a03db60bf60042242d6a556fc3be119046a5","analyzedAt":"2026-08-25T21:25:25.994Z","schemaVersion":2},"datasetVersion":"2026-08-26T02:17:13.382Z"}