{"record":{"id":"3d0a9c18aefadc9d","repo":"keras-team/keras","slug":"stack-supports-only-x-as-list-or-tuple-receiv","errorCode":null,"errorMessage":"`stack` supports only `x` as list or tuple. Received: {type(x)}","messagePattern":"`stack` supports only `x` as list or tuple\\. Received: (.+?)","errorType":"exception","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"keras/src/backend/openvino/numpy.py","lineNumber":4426,"sourceCode":"    )\n    split_lengths_tensor = ov_opset.constant(\n        split_lengths, dtype=Type.i64\n    ).output(0)\n\n    axis_tensor = ov_opset.constant(axis, dtype=Type.i32).output(0)\n    splits = ov_opset.variadic_split(x, axis_tensor, split_lengths_tensor)\n\n    result = []\n    for i in range(num_splits_val):\n        result.append(OpenVINOKerasTensor(splits.output(i)))\n    return result\n\n\ndef stack(x, axis=0):\n    if isinstance(x, tuple):\n        x = list(x)\n    if not isinstance(x, list):\n        raise ValueError(\n            f\"`stack` supports only `x` as list or tuple. Received: {type(x)}\"\n        )\n    elems = [get_ov_output(e) for e in x]\n    ref = elems[0]\n    for i in range(1, len(elems)):\n        ref, elems[i] = _align_operand_types(ref, elems[i], \"stack()\")\n    elems[0] = ref\n    const_axis = ov_opset.constant(axis, Type.i32).output(0)\n    elems = [ov_opset.unsqueeze(e, const_axis).output(0) for e in elems]\n    res = ov_opset.concat(elems, axis).output(0)\n    return OpenVINOKerasTensor(res)\n\n\ndef std(x, axis=None, keepdims=False):\n    var_x = var(x, axis, keepdims)\n    std_dev = ov_opset.sqrt(var_x.output).output(0)\n    return OpenVINOKerasTensor(std_dev)\n","sourceCodeStart":4408,"sourceCodeEnd":4444,"githubUrl":"https://github.com/keras-team/keras/blob/7a34a03db60bf60042242d6a556fc3be119046a5/keras/src/backend/openvino/numpy.py#L4408-L4444","documentation":"Error \"`stack` supports only `x` as list or tuple. Received: {type(x)}\" thrown in keras-team/keras.","triggerScenarios":"Thrown at keras/src/backend/openvino/numpy.py:4426 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"}