python

PyTorch optimizer has no parameters

ValueError: optimizer got an empty parameter list

Fixes

1.Ensure model.parameters() is called after model is fully defined
2.Check that the model has trainable parameters (requires_grad=True)
3.Verify the model isn't wrapped incorrectly (e.g., double DataParallel)

pytorchoptimizer

Related Errors

Asyncio event loop already running

RuntimeError: This event loop is already running

•Use nest_asyncio.apply() to allow nested event loops
•Use asyncio.run_coroutine_threadsafe() instead of asyncio.run()

Coroutine never awaited

RuntimeWarning: coroutine '.*' was never awaited

•Add 'await' before the coroutine call
•Use asyncio.create_task() to schedule the coroutine

Asyncio task was cancelled

asyncio\.CancelledError

•Handle CancelledError in try/except within the task
•Use asyncio.shield() to protect critical sections from cancellation