{"record":{"id":"f21ba34ef69093ed","repo":"tensorflow/models","slug":"if-masks-are-included-you-cannot-convert-coco-from","errorCode":null,"errorMessage":"If masks are included you cannot convert coco from the91 class format to the 80 class format.","messagePattern":"If masks are included you cannot convert coco from the91 class format to the 80 class format\\.","errorType":"exception","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"official/projects/yolo/dataloaders/tf_example_decoder.py","lineNumber":79,"sourceCode":"\n  def __init__(self,\n               coco91_to_80=None,\n               include_mask=False,\n               regenerate_source_id=False,\n               mask_binarize_threshold=None):\n    \"\"\"Initialize the example decoder.\n\n    Args:\n      coco91_to_80: `bool` indicating whether to convert coco from its 91 class\n        format to the 80 class format.\n      include_mask: `bool` indicating if the decoder should also decode instance\n        masks for instance segmentation.\n      regenerate_source_id: `bool` indicating if the source id needs to be\n        recreated for each image sample.\n      mask_binarize_threshold: `float` for binarizing mask values.\n    \"\"\"\n    if coco91_to_80 and include_mask:\n      raise ValueError('If masks are included you cannot convert coco from the'\n                       '91 class format to the 80 class format.')\n\n    self._coco91_to_80 = coco91_to_80\n    super().__init__(\n        include_mask=include_mask,\n        regenerate_source_id=regenerate_source_id,\n        mask_binarize_threshold=mask_binarize_threshold)\n\n  def decode(self, serialized_example):\n    \"\"\"Decode the serialized example.\n\n    Args:\n      serialized_example: a single serialized tf.Example string.\n\n    Returns:\n      decoded_tensors: a dictionary of tensors with the following fields:\n        - source_id: a string scalar tensor.\n        - image: a uint8 tensor of shape [None, None, 3].","sourceCodeStart":61,"sourceCodeEnd":97,"githubUrl":"https://github.com/tensorflow/models/blob/e006f5f0d534913e49c1f1dae87364039fa607e2/official/projects/yolo/dataloaders/tf_example_decoder.py#L61-L97","documentation":"Error \"If masks are included you cannot convert coco from the91 class format to the 80 class format.\" thrown in tensorflow/models.","triggerScenarios":"Thrown at official/projects/yolo/dataloaders/tf_example_decoder.py:79 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"}