estimate-memory

Estimate peak GPU memory for a DualPipeV training run. Use when the user asks to "estimate memory", "will this fit in memory", "how much GPU memory", "check if this OOMs", "memory for training X on Y GPUs", or mentions memory planning for a training configuration. Translates natural-language descriptions of hardware, model, and training setup into the exact CLI arguments for `python -m tools.memory_estimator`.