Sure... I think you are missing the point. In Nov., the Nature paper which contains the AlphaGo algorithm, the hardware detailed was exclusively CPU+GPUs. Betw

Sure... I think you are missing the point. In Nov., the Nature paper which contains the AlphaGo algorithm, the hardware detailed was exclusively CPU+GPUs. Between that time and the Lee Sedol match, the hardware running AlphaGo was switched, to these TPU. From the paper: "The final version of AlphaGo used 40 search threads, 48 CPUs, and 8 GPUs. We also implemented a distributed version of AlphaGo that exploited multiple machines, 40 search threads, 1,202 CPUs and 176 GPUs."