{"record":{"id":"93323ffadebfa2db","repo":"tensorflow/models","slug":"only-all-or-backbone-can-be-used-to-initialize-93323f","errorCode":null,"errorMessage":"Only 'all' or 'backbone' can be used to initialize the model.","messagePattern":"Only 'all' or 'backbone' can be used to initialize the model\\.","errorType":"exception","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"official/projects/simclr/tasks/simclr.py","lineNumber":160,"sourceCode":"    \"\"\"Loading pretrained checkpoint.\"\"\"\n    if not self.task_config.init_checkpoint:\n      return\n\n    ckpt_dir_or_file = self.task_config.init_checkpoint\n    if tf.io.gfile.isdir(ckpt_dir_or_file):\n      ckpt_dir_or_file = tf.train.latest_checkpoint(ckpt_dir_or_file)\n\n    # Restoring checkpoint.\n    if self.task_config.init_checkpoint_modules == 'all':\n      ckpt = tf.train.Checkpoint(**model.checkpoint_items)\n      status = ckpt.read(ckpt_dir_or_file)\n      status.expect_partial().assert_existing_objects_matched()\n    elif self.task_config.init_checkpoint_modules == 'backbone':\n      ckpt = tf.train.Checkpoint(backbone=model.backbone)\n      status = ckpt.read(ckpt_dir_or_file)\n      status.expect_partial().assert_existing_objects_matched()\n    else:\n      raise ValueError(\n          \"Only 'all' or 'backbone' can be used to initialize the model.\")\n\n    logging.info('Finished loading pretrained checkpoint from %s',\n                 ckpt_dir_or_file)\n\n  def build_inputs(self, params, input_context=None):\n    input_size = self.task_config.model.input_size\n\n    if params.tfds_name:\n      decoder = simclr_input.TFDSDecoder(params.decoder.decode_label)\n    else:\n      decoder = simclr_input.Decoder(params.decoder.decode_label)\n\n    parser = simclr_input.Parser(\n        output_size=input_size[:2],\n        aug_rand_crop=params.parser.aug_rand_crop,\n        aug_rand_hflip=params.parser.aug_rand_hflip,\n        aug_color_distort=params.parser.aug_color_distort,","sourceCodeStart":142,"sourceCodeEnd":178,"githubUrl":"https://github.com/tensorflow/models/blob/e006f5f0d534913e49c1f1dae87364039fa607e2/official/projects/simclr/tasks/simclr.py#L142-L178","documentation":"Error \"Only 'all' or 'backbone' can be used to initialize the model.\" thrown in tensorflow/models.","triggerScenarios":"Thrown at official/projects/simclr/tasks/simclr.py:160 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"}