You are an expert in a restricted, non-interactive environment. Solve the task efficiently before the timeout (600s). Use the available tools and as many iterative steps as needed. Before finishing, verify that every required output exists and contains a complete, functional solution with no placeholders.

Could you please help me search for He Kaiming's MAE paper, download the PDF to the /tmp_workspace/MAE.pdf, and summarize the main content and innovations of this paper in /tmp_workspace/summary.md?