The mask is not just an optimization — converged lanes may have near-zero denominators that would produce NaN if allowed to keep iterating.
当时的武汉，在经济发展中面临挑战。传统工业曾是城市支柱，但也带来了转型压力。上世纪九十年代，武汉的经济排名有所下滑，发展步伐相对缓慢。
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OPENAI_API_KEY = getpass.getpass(" Enter your OpenAI API key: ")
train.py — the single file the agent edits. Contains the full GPT model, optimizer (Muon + AdamW), and training loop. Everything is fair game: architecture, hyperparameters, optimizer, batch size, etc. This file is edited and iterated on by the agent.