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Summary:
TIL ONNX->Caffe2 is very memory inefficient, it creates an intermediate blob for each intermediate output. So, the Gelu operator creates a lot of intermediate ops since it does a bunch of math.
Fix is to use the caffe2 Gelu operator, so all that computation is captured in a single op.
https://pxl.cl/HzGf
Differential Revision: D16849396