{"record":{"id":"fc0c393c8e5d328e","repo":"tensorflow/models","slug":"unknown-replica-context-the-get-replica-id-meth","errorCode":null,"errorMessage":"Unknown replica context. The `get_replica_id` method relies on TF 2.x tf.distribute API.","messagePattern":"Unknown replica context\\. The `get_replica_id` method relies on TF 2\\.x tf\\.distribute API\\.","errorType":"exception","errorClass":"RuntimeError","httpStatus":null,"severity":"error","filePath":"official/modeling/tf_utils.py","lineNumber":223,"sourceCode":"  Args:\n    losses: `Tensor` whose elements contain individual loss measurements.\n\n  Returns:\n    A scalar representing the mean of `losses`. If `num_present` is zero,\n      then zero is returned.\n  \"\"\"\n  total = tf.reduce_sum(losses)\n  num_elements = tf.cast(tf.size(losses), dtype=losses.dtype)\n  return tf.math.divide_no_nan(total, num_elements)\n\n\ndef get_replica_id():\n  \"\"\"Gets replica id depending on the environment.\"\"\"\n  context = tf.distribute.get_replica_context()\n  if context is not None:\n    return context.replica_id_in_sync_group\n  else:\n    raise RuntimeError(\"Unknown replica context. The `get_replica_id` method \"\n                       \"relies on TF 2.x tf.distribute API.\")\n\n\ndef cross_replica_concat(value, axis, name=\"cross_replica_concat\"):\n  \"\"\"Concatenates the given `value` across (GPU/TPU) cores, along `axis`.\n\n  In general, each core (\"replica\") will pass a\n  replica-specific value as `value` (corresponding to some element of a\n  data-parallel computation taking place across replicas).\n\n  The resulting concatenated `Tensor` will have the same shape as `value` for\n  all dimensions except `axis`, where it will be larger by a factor of the\n  number of replicas. It will also have the same `dtype` as `value`.\n\n  The position of a given replica's `value` within the resulting concatenation\n  is determined by that replica's replica ID. For\n  example:\n","sourceCodeStart":205,"sourceCodeEnd":241,"githubUrl":"https://github.com/tensorflow/models/blob/e006f5f0d534913e49c1f1dae87364039fa607e2/official/modeling/tf_utils.py#L205-L241","documentation":"Error \"Unknown replica context. The `get_replica_id` method relies on TF 2.x tf.distribute API.\" thrown in tensorflow/models.","triggerScenarios":"Thrown at official/modeling/tf_utils.py:223 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"}