onnx alt mish in native float format #2356
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Extensive testing shows the alt_mish expansion has acceptable performance in both fp16 and bf16, with the main issue that it goes to zero faster for negative inputs. The worse fp16 error was at -11.093750, where the returned value was 0 instead of -0.000168702, with the bf16 version very close to the direct calculation (in bf16).