{"record":{"id":"7d21da1d15c3391d","repo":"keras-team/keras","slug":"a-symbolic-kerastensor-cannot-be-used-as-a-boolean","errorCode":null,"errorMessage":"A symbolic KerasTensor cannot be used as a boolean.","messagePattern":"A symbolic KerasTensor cannot be used as a boolean\\.","errorType":"exception","errorClass":"TypeError","httpStatus":null,"severity":"error","filePath":"keras/src/backend/common/keras_tensor.py","lineNumber":228,"sourceCode":"            \"    def call(self, x):\\n\"\n            \"        return tf_fn(x)\\n\\n\"\n            \"x = MyLayer()(x)\\n\"\n            \"```\\n\"\n        )\n\n    def __repr__(self):\n        return (\n            f\"<KerasTensor shape={self.shape}, dtype={self.dtype}, \"\n            f\"sparse={self.sparse}, ragged={self.ragged}, name={self.name}>\"\n        )\n\n    def __iter__(self):\n        raise NotImplementedError(\n            \"Iterating over a symbolic KerasTensor is not supported.\"\n        )\n\n    def __bool__(self):\n        raise TypeError(\"A symbolic KerasTensor cannot be used as a boolean.\")\n\n    def __add__(self, other):\n        from keras.src import ops\n\n        return ops.Add().symbolic_call(self, other)\n\n    def __radd__(self, other):\n        from keras.src import ops\n\n        return ops.Add().symbolic_call(other, self)\n\n    def __sub__(self, other):\n        from keras.src import ops\n\n        return ops.Subtract().symbolic_call(self, other)\n\n    def __rsub__(self, other):\n        from keras.src import ops","sourceCodeStart":210,"sourceCodeEnd":246,"githubUrl":"https://github.com/keras-team/keras/blob/7a34a03db60bf60042242d6a556fc3be119046a5/keras/src/backend/common/keras_tensor.py#L210-L246","documentation":"Error \"A symbolic KerasTensor cannot be used as a boolean.\" thrown in keras-team/keras.","triggerScenarios":"Thrown at keras/src/backend/common/keras_tensor.py:228 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"}