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Implement Tanh Gelu Approximation (#61439)
Summary: 1. Implements #39853 2. Adds approximate boolean flag to Gelu 3. Enables Tanh Gelu approximation 4. Adds double backward support for Gelu 5. Enable Tanh Gelu in NvFuser ``` def gelu(x, approximate : str = 'none'): if approximate == 'tanh': # sqrt(2/pi) = 0.7978845608028654 return 0.5 * x * (1.0 + torch.tanh(0.7978845608028654 * (x + 0.044715 * torch.pow(x, 3.0)))) else: return x * normcdf(x) ``` Linking XLA PR - pytorch/xla#3039 Pull Request resolved: #61439 Reviewed By: cpuhrsch Differential Revision: D33850228 Pulled By: jbschlosser fbshipit-source-id: 3cc33fb298e480d7ecc5c67716da019d60c6ab33 (cherry picked from commit 3a53b3e)
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