[PR] [Unity] Add fast_pow in FastMathTransform pass [tvm]

["HongHongHongL (via GitHub)" <gi...@apache.org>]

HongHongHongL opened a new pull request, #15979:
URL: https://github.com/apache/tvm/pull/15979

   This PR uses fast_exp to convert power op to fast but approximate counterpart.
   
   When y is not an integer, fast_exp(log(x) * y) is much faster than topi.power(x, y). However, if y is not a constant, fast_exp(log(x) * y) will get a wrong anwser when x < 0 and y is an integer. To fix this problem, this PR uses power(x, y) = exp(log(abs(x)) * y) * (log((x / abs(x) - 1) * (ceil(y) - floor(y)) + 1) + (x / abs(x) - 1) * (y % 2) + 1).


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Re: [PR] [Unity] Add fast_pow in FastMathTransform pass [tvm]

["tqchen (via GitHub)" <gi...@apache.org>]

tqchen closed pull request #15979: [Unity] Add fast_pow in FastMathTransform pass
URL: https://github.com/apache/tvm/pull/15979


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