{"record":{"id":"3fd41f6d8b494f31","repo":"keras-team/keras","slug":"cannot-create-sharding-when-device-mesh-is-not-set-3fd41f","errorCode":null,"errorMessage":"Cannot create sharding when device mesh is not set for TensorLayout.","messagePattern":"Cannot create sharding when device mesh is not set for TensorLayout\\.","errorType":"validation","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"keras/src/backend/tensorflow/distribution_lib.py","lineNumber":78,"sourceCode":"        A `tf.dtensor.Mesh` instance.\n    \"\"\"\n    mesh_dims = list(zip(device_mesh.axis_names, device_mesh.shape))\n    return dtensor.create_distributed_mesh(\n        mesh_dims=mesh_dims, local_devices=device_mesh.devices.flatten()\n    )\n\n\ndef _to_backend_layout(tensor_layout):\n    \"\"\"Convert the TensorLayout to Tensorflow backend specific Sharding.\n\n    Args:\n        tensor_layout: TensorLayout instance to convert.\n\n    Returns:\n        A `tf.dtensor.Layout` instance.\n    \"\"\"\n    if tensor_layout.device_mesh is None:\n        raise ValueError(\n            \"Cannot create sharding when device mesh is not set for \"\n            \"TensorLayout.\"\n        )\n\n    sharding_specs = [\n        axis if axis else dtensor.UNSHARDED for axis in tensor_layout.axes\n    ]\n    dtensor_mesh = tensor_layout.device_mesh.backend_mesh\n    return dtensor.Layout(sharding_specs=sharding_specs, mesh=dtensor_mesh)\n","sourceCodeStart":60,"sourceCodeEnd":88,"githubUrl":"https://github.com/keras-team/keras/blob/7a34a03db60bf60042242d6a556fc3be119046a5/keras/src/backend/tensorflow/distribution_lib.py#L60-L88","documentation":"Error \"Cannot create sharding when device mesh is not set for TensorLayout.\" thrown in keras-team/keras.","triggerScenarios":"Thrown at keras/src/backend/tensorflow/distribution_lib.py:78 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"}