Fix ChildFailedError

✅ Solution

The "ChildFailedError" in Accelerate usually arises from unhandled exceptions or errors within the child processes during distributed training, such as a missing key in the model state dict or NCCL timeouts. To resolve this, carefully examine the complete traceback to identify the root cause (e.g., missing model weights or network issues), and address the specific error in your code or environment configuration. Increasing NCCL timeout values or ensuring all processes have access to necessary model components are common fixes.