{"record":{"id":"c5763fe7d8772842","repo":"tensorflow/models","slug":"unknown-decoder-type-c5763f","errorCode":null,"errorMessage":"Unknown decoder type: {}!","messagePattern":"Unknown decoder type: (.+?)!","errorType":"exception","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"official/vision/tasks/maskrcnn.py","lineNumber":151,"sourceCode":"      params: exp_cfg.DataConfig,\n      input_context: Optional[tf.distribute.InputContext] = None,\n      dataset_fn: Optional[dataset_fn_lib.PossibleDatasetType] = None\n  ) -> tf.data.Dataset:\n    \"\"\"Builds input dataset.\"\"\"\n    decoder_cfg = params.decoder.get()\n    if params.decoder.type == 'simple_decoder':\n      decoder = tf_example_decoder.TfExampleDecoder(\n          include_mask=self._task_config.model.include_mask,\n          regenerate_source_id=decoder_cfg.regenerate_source_id,\n          mask_binarize_threshold=decoder_cfg.mask_binarize_threshold)\n    elif params.decoder.type == 'label_map_decoder':\n      decoder = tf_example_label_map_decoder.TfExampleDecoderLabelMap(\n          label_map=decoder_cfg.label_map,\n          include_mask=self._task_config.model.include_mask,\n          regenerate_source_id=decoder_cfg.regenerate_source_id,\n          mask_binarize_threshold=decoder_cfg.mask_binarize_threshold)\n    else:\n      raise ValueError('Unknown decoder type: {}!'.format(params.decoder.type))\n\n    parser = maskrcnn_input.Parser(\n        output_size=self.task_config.model.input_size[:2],\n        min_level=self.task_config.model.min_level,\n        max_level=self.task_config.model.max_level,\n        num_scales=self.task_config.model.anchor.num_scales,\n        aspect_ratios=self.task_config.model.anchor.aspect_ratios,\n        anchor_size=self.task_config.model.anchor.anchor_size,\n        rpn_match_threshold=params.parser.rpn_match_threshold,\n        rpn_unmatched_threshold=params.parser.rpn_unmatched_threshold,\n        rpn_batch_size_per_im=params.parser.rpn_batch_size_per_im,\n        rpn_fg_fraction=params.parser.rpn_fg_fraction,\n        aug_rand_hflip=params.parser.aug_rand_hflip,\n        aug_rand_vflip=params.parser.aug_rand_vflip,\n        aug_scale_min=params.parser.aug_scale_min,\n        aug_scale_max=params.parser.aug_scale_max,\n        aug_type=params.parser.aug_type,\n        skip_crowd_during_training=params.parser.skip_crowd_during_training,","sourceCodeStart":133,"sourceCodeEnd":169,"githubUrl":"https://github.com/tensorflow/models/blob/e006f5f0d534913e49c1f1dae87364039fa607e2/official/vision/tasks/maskrcnn.py#L133-L169","documentation":"Error \"Unknown decoder type: {}!\" thrown in tensorflow/models.","triggerScenarios":"Thrown at official/vision/tasks/maskrcnn.py:151 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Use a supported decoder type: 'fpn' or 'dilated_fpn' for Mask R-CNN.","Check the decoder type in the model config for typos."],"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"}