BF16 winograd path: kernel=3, dilation=1, stride=1, winograd=true, sgemm=false Need num_input>8 || num_output>8 for prefer_winograd winograd43 is the default variant (when neither 63 nor 23 is preferred) winograd63: num_input<64 and specific size ranges (e.g. c=16,outch=16,minwh~25-44) winograd23: large channels with small spatial (e.g. c=512,outch=512,minwh=3-14)
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