{"record":{"id":"49e5f9be1b122c50","repo":"tensorflow/models","slug":"stem-type-not-supported-49e5f9","errorCode":null,"errorMessage":"Stem type {} not supported.","messagePattern":"Stem type (.+?) not supported\\.","errorType":"exception","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"official/vision/modeling/backbones/resnet_deeplab.py","lineNumber":219,"sourceCode":"      x = layers.Conv2D(\n          filters=128,\n          kernel_size=3,\n          strides=1,\n          use_bias=False,\n          padding='same',\n          kernel_initializer=self._kernel_initializer,\n          kernel_regularizer=self._kernel_regularizer,\n          bias_regularizer=self._bias_regularizer)(\n              x)\n      x = self._norm(\n          axis=bn_axis,\n          momentum=norm_momentum,\n          epsilon=norm_epsilon,\n          synchronized=use_sync_bn)(\n              x)\n      x = tf_utils.get_activation(activation)(x)\n    else:\n      raise ValueError('Stem type {} not supported.'.format(stem_type))\n\n    if replace_stem_max_pool:\n      x = layers.Conv2D(\n          filters=64,\n          kernel_size=3,\n          strides=2,\n          use_bias=False,\n          padding='same',\n          kernel_initializer=self._kernel_initializer,\n          kernel_regularizer=self._kernel_regularizer,\n          bias_regularizer=self._bias_regularizer)(\n              x)\n      x = self._norm(\n          axis=bn_axis,\n          momentum=norm_momentum,\n          epsilon=norm_epsilon,\n          synchronized=use_sync_bn)(\n              x)","sourceCodeStart":201,"sourceCodeEnd":237,"githubUrl":"https://github.com/tensorflow/models/blob/e006f5f0d534913e49c1f1dae87364039fa607e2/official/vision/modeling/backbones/resnet_deeplab.py#L201-L237","documentation":"Error \"Stem type {} not supported.\" thrown in tensorflow/models.","triggerScenarios":"Thrown at official/vision/modeling/backbones/resnet_deeplab.py:219 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Use stem_type 'v0' or 'v1' in the ResNet-Deeplab backbone config.","Remove stem_type to use the default stem."],"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"}