{"record":{"id":"0b140cc501bca78c","repo":"tensorflow/models","slug":"backbone-model-is-not-supported","errorCode":null,"errorMessage":"Backbone model `{}` is not supported.","messagePattern":"Backbone model `(.+?)` is not supported\\.","errorType":"exception","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"official/legacy/detection/modeling/architecture/factory.py","lineNumber":50,"sourceCode":"      epsilon=params.batch_norm_epsilon,\n      trainable=params.batch_norm_trainable,\n      activation=params.activation)\n\n\ndef backbone_generator(params):\n  \"\"\"Generator function for various backbone models.\"\"\"\n  if params.architecture.backbone == 'resnet':\n    resnet_params = params.resnet\n    backbone_fn = resnet.Resnet(\n        resnet_depth=resnet_params.resnet_depth,\n        activation=params.norm_activation.activation,\n        norm_activation=norm_activation_generator(\n            params.norm_activation))\n  elif params.architecture.backbone == 'spinenet':\n    spinenet_params = params.spinenet\n    backbone_fn = spinenet.SpineNetBuilder(model_id=spinenet_params.model_id)\n  else:\n    raise ValueError('Backbone model `{}` is not supported.'\n                     .format(params.architecture.backbone))\n\n  return backbone_fn\n\n\ndef multilevel_features_generator(params):\n  \"\"\"Generator function for various FPN models.\"\"\"\n  if params.architecture.multilevel_features == 'fpn':\n    fpn_params = params.fpn\n    fpn_fn = fpn.Fpn(\n        min_level=params.architecture.min_level,\n        max_level=params.architecture.max_level,\n        fpn_feat_dims=fpn_params.fpn_feat_dims,\n        use_separable_conv=fpn_params.use_separable_conv,\n        activation=params.norm_activation.activation,\n        use_batch_norm=fpn_params.use_batch_norm,\n        norm_activation=norm_activation_generator(\n            params.norm_activation))","sourceCodeStart":32,"sourceCodeEnd":68,"githubUrl":"https://github.com/tensorflow/models/blob/e006f5f0d534913e49c1f1dae87364039fa607e2/official/legacy/detection/modeling/architecture/factory.py#L32-L68","documentation":"Error \"Backbone model `{}` is not supported.\" thrown in tensorflow/models.","triggerScenarios":"Thrown at official/legacy/detection/modeling/architecture/factory.py:50 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":"e006f5f0d534913e49c1f1dae87364039fa607e2","analyzedAt":"2026-08-24T14:09:15.576Z","schemaVersion":2},"datasetVersion":"2026-08-24T17:17:21.512Z"}