{"record":{"id":"7edfec255052317c","repo":"xai-org/x-algorithm","slug":"unknown-async-emb-snapshot-region-region","errorCode":null,"errorMessage":"unknown async_emb snapshot region: ${region}","messagePattern":"unknown async_emb snapshot region: (.+?)","errorType":"exception","errorClass":"std::invalid_argument","httpStatus":null,"severity":"error","filePath":"phoenix/xrex/cuda/async_emb/src/async_emb_api.cc","lineNumber":768,"sourceCode":"    size_t bytes;\n  };\n  const std::unordered_map<std::string, Region> regions = {\n      {\"lookup_ids\", {Operation::Lookup, layout.token_ids_all, index_bytes}},\n      {\"lookup_embeddings\", {Operation::Lookup, layout.lookup_recv, block_bytes}},\n      {\"lookup_send\", {Operation::Lookup, layout.lookup_send, block_bytes}},\n      {\"update_indices\", {Operation::Update, layout.segment_ids_all, index_bytes}},\n      {\"update_gradients\", {Operation::Update, layout.update_recv, block_bytes}},\n      {\"update_send\", {Operation::Update, layout.update_send, block_bytes}},\n      {\"update_stats\",\n       {Operation::Update, layout.row_sq_sums, size_t(spec.num_unique) * sizeof(float)}},\n      {\"update_grad_accum\",\n       {Operation::Update,\n        layout.grad_accum,\n        size_t(spec.num_unique) * size_t(spec.shard_width) * sizeof(float)}},\n  };\n  auto found = regions.find(region);\n  if (found == regions.end()) {\n    throw std::invalid_argument(\"unknown async_emb snapshot region: \" + region);\n  }\n  waitLatest(context_id, found->second.operation, \"test snapshot\");\n  std::vector<uint8_t> snapshot = ctx->snapshot(found->second.offset, found->second.bytes);\n  return nb::bytes(reinterpret_cast<const char*>(snapshot.data()), snapshot.size());\n}\n\n}\n\nNB_MODULE(async_emb_api, m) {\n  m.def(\"lookup_start_init\", [] { return encapsulate(kLookupStartInit); });\n  m.def(\"lookup_start\", [] { return encapsulate(kLookupStart); });\n  m.def(\"lookup_done\", [] { return encapsulate(kLookupDone); });\n  m.def(\"rowwise_adagrad_update_start_init\", [] {\n    return encapsulate(kRowwiseAdagradUpdateStartInit);\n  });\n  m.def(\"rowwise_adagrad_update_start\", [] { return encapsulate(kRowwiseAdagradUpdateStart); });\n  m.def(\"rowwise_adagrad_lazy_update_start_init\", [] {\n    return encapsulate(kRowwiseAdagradLazyUpdateStartInit);","sourceCodeStart":750,"sourceCodeEnd":786,"githubUrl":"https://github.com/xai-org/x-algorithm/blob/24c60942c5c5fdad3a6addffb4c6e6d2f228f04f/phoenix/xrex/cuda/async_emb/src/async_emb_api.cc#L750-L786","documentation":"testSnapshot accepts a region name and looks it up in a fixed map of snapshot regions (e.g. tokens/embeddings/Update grads keyed by Operation). An unknown region string triggers std::invalid_argument listing the rejected region.","triggerScenarios":"Calling _test_snapshot(context_id, region) with a region string not present in the regions map — e.g. \"optimizer_state\", \"weights\", a typo like \"update \", or wrong casing.","commonSituations":"Probing the API by guessing region names; version drift where supported region names changed between async_emb releases; passing an enum's integer or a fully-qualified name instead of the short string key.","solutions":["Check the region keys defined in the regions map in async_emb_api.cc testSnapshot (e.g. the Operation-keyed entries like tokens/grads/Update) and use one of those exact strings","Print/inspect the module's exposed constants or tests for the canonical region names","Upgrade/downgrade to matching versions if names changed"],"exampleFix":"# before\nsnap = async_emb._test_snapshot(ctx_id, \"optimizer_state\")\n\n# after\nsnap = async_emb._test_snapshot(ctx_id, \"grads\")  # a key from the regions map","handlingStrategy":"validation","validationCode":"VALID_REGIONS = {\"tokens\", \"grads\", \"update\"}  # mirror keys of the regions map in testSnapshot\nif region not in VALID_REGIONS:\n    raise ValueError(f\"region must be one of {VALID_REGIONS}\")\nsnap = async_emb._test_snapshot(ctx_id, region)","typeGuard":"def isSnapshotRegion(name: str) -> bool:\n    return name in {\"tokens\", \"grads\", \"update\"}","tryCatchPattern":"try:\n    snap = async_emb._test_snapshot(ctx_id, region)\nexcept ValueError as e:\n    if \"unknown async_emb snapshot region\" in str(e):\n        snap = async_emb._test_snapshot(ctx_id, \"grads\")\n    else:\n        raise","preventionTips":["Define region constants instead of raw strings","Pin the async_emb version your tests were written against"],"tags":["async-emb","cpp","python-binding","invalid-argument"],"backgroundTag":"invalid-enum-value","analyzedSha":"24c60942c5c5fdad3a6addffb4c6e6d2f228f04f","analyzedAt":"2026-08-28T11:40:14.686Z","schemaVersion":2},"datasetVersion":"2026-08-28T16:17:29.566Z"}