{"record":{"id":"13317721ceae2879","repo":"keras-team/keras","slug":"expected-input-x-to-have-rank-2-received-rank","errorCode":null,"errorMessage":"Expected input `x` to have rank 2. Received: rank(x)={ndim(x)}","messagePattern":"Expected input `x` to have rank 2\\. Received: rank\\(x\\)=(.+?)","errorType":"exception","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"keras/src/legacy/backend.py","lineNumber":1301,"sourceCode":"    else:\n        x = tf.nn.relu(x)\n\n    if clip_max:\n        max_value = tf.convert_to_tensor(max_value, dtype=x.dtype)\n        zero = tf.convert_to_tensor(0, dtype=x.dtype)\n        x = tf.clip_by_value(x, zero, max_value)\n\n    if alpha != 0.0:\n        alpha = tf.convert_to_tensor(alpha, dtype=x.dtype)\n        x -= alpha * negative_part\n    return x\n\n\n@keras_export(\"keras._legacy.backend.repeat\")\ndef repeat(x, n):\n    \"\"\"DEPRECATED.\"\"\"\n    if ndim(x) != 2:\n        raise ValueError(\n            f\"Expected input `x` to have rank 2. Received: rank(x)={ndim(x)}\"\n        )\n    x = tf.expand_dims(x, 1)\n    pattern = tf.stack([1, n, 1])\n    return tf.tile(x, pattern)\n\n\n@keras_export(\"keras._legacy.backend.repeat_elements\")\ndef repeat_elements(x, rep, axis):\n    \"\"\"DEPRECATED.\"\"\"\n    x_shape = x.shape.as_list()\n    # For static axis\n    if x_shape[axis] is not None:\n        # slices along the repeat axis\n        splits = tf.split(value=x, num_or_size_splits=x_shape[axis], axis=axis)\n        # repeat each slice the given number of reps\n        x_rep = [s for s in splits for _ in range(rep)]\n        return concatenate(x_rep, axis)","sourceCodeStart":1283,"sourceCodeEnd":1319,"githubUrl":"https://github.com/keras-team/keras/blob/7a34a03db60bf60042242d6a556fc3be119046a5/keras/src/legacy/backend.py#L1283-L1319","documentation":"Error \"Expected input `x` to have rank 2. Received: rank(x)={ndim(x)}\" thrown in keras-team/keras.","triggerScenarios":"Thrown at keras/src/legacy/backend.py:1301 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"}