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[https://nvbugs/6463831][fix] Replace isinstance(self.mpi_session, MpiPoolSession) with `not… #16491

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[https://nvbugs/6463831][fix] Replace isinstance(self.mpi_session, MpiPoolSession) with `not… #16491

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5 changes: 4 additions & 1 deletion tensorrt_llm/executor/proxy.py
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Original file line number Diff line number Diff line change
Expand Up @@ -573,7 +573,10 @@ def mpi_done_callback(future: concurrent.futures.Future):
raise RuntimeError(
"Executor worker returned error") from ready_signal

if isinstance(self.mpi_session, MpiPoolSession) and len(status) == 3:
# Use the polymorphic predicate: the module-level ``MpiPoolSession``
# symbol may be rebound to a factory at runtime by test infrastructure
# (tests/test_common/session_reuse.py), breaking ``isinstance``.
if not self.mpi_session.is_comm_session() and len(status) == 3:
worker_process_identities: List[WorkerProcessIdentity] = status[2]
self._worker_process_monitor.register(worker_process_identities)

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