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Intermittent CPU Usage Limitation During PyTorch Training on Windows (Jupyter Notebook)

I’m facing an issue with my PyTorch model training on Windows 10 using Jupyter Notebook. I’ve written a Python script to train a LSTM model over 500 epochs. The training process sometimes uses 100% of the CPU, which is expected and desired, but other times it inexplicably drops to only ~33% usage, which significantly slows down the training.