{"record":{"id":"15f759e719093ea4","repo":"keras-team/keras","slug":"scaling-is-invalid-it-must-be-none-density-o","errorCode":null,"errorMessage":"Scaling is invalid, it must be `None`, 'density' or 'spectrum'. Received scaling={scaling}","messagePattern":"Scaling is invalid, it must be `None`, 'density' or 'spectrum'\\. Received scaling=(.+?)","errorType":"validation","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"keras/src/layers/preprocessing/stft_spectrogram.py","lineNumber":178,"sourceCode":"                f\"Received fft_length={fft_length}, frame_length={frame_length}\"\n            )\n\n        if fft_length is not None and (fft_length & -fft_length) != fft_length:\n            warnings.warn(\n                \"`fft_length` is recommended to be a power of two. \"\n                f\"Received fft_length={fft_length}\"\n            )\n\n        all_modes = [\"log\", \"magnitude\", \"psd\", \"real\", \"imag\", \"angle\", \"stft\"]\n\n        if mode not in all_modes:\n            raise ValueError(\n                \"Output mode is invalid, it must be one of \"\n                f\"{', '.join(all_modes)}. Received: mode={mode}\"\n            )\n\n        if scaling is not None and scaling not in [\"density\", \"spectrum\"]:\n            raise ValueError(\n                \"Scaling is invalid, it must be `None`, 'density' \"\n                f\"or 'spectrum'. Received scaling={scaling}\"\n            )\n\n        if padding not in [\"valid\", \"same\"]:\n            raise ValueError(\n                \"Padding is invalid, it should be 'valid', 'same'. \"\n                f\"Received: padding={padding}\"\n            )\n\n        if isinstance(window, str):\n            # throws an exception for invalid window function\n            scipy.signal.get_window(window, 1)\n\n        super().__init__(**kwargs)\n\n        self.mode = mode\n","sourceCodeStart":160,"sourceCodeEnd":196,"githubUrl":"https://github.com/keras-team/keras/blob/7a34a03db60bf60042242d6a556fc3be119046a5/keras/src/layers/preprocessing/stft_spectrogram.py#L160-L196","documentation":"Error \"Scaling is invalid, it must be `None`, 'density' or 'spectrum'. Received scaling={scaling}\" thrown in keras-team/keras.","triggerScenarios":"Thrown at keras/src/layers/preprocessing/stft_spectrogram.py:178 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"}