optimized sigmoid

[kimishpatel]

Stack from ghstack (oldest at bottom):

• -> optimized sigmoid #6241
• Handle broadcast semantics for last dim #6240
• mul broadcast update #6239

basically use exp approximation

Differential Revision: D64156864

[pytorch-bot]

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❌ 5 New Failures

As of commit 980c005 with merge base cd2d2b4 ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner / linux-job (gh)
  >>> Lint for kernels/optimized/cpu/op_sigmoid.cpp:
• pull / test-llama-runner-linux (bf16, buck2, portable) / linux-job (gh)
  RuntimeError: Command docker exec -t f88abbe5c78b600cb573dcdc02e7464cc4e3f618740e2b5319a3bfcb99807f02 /exec failed with exit code 1
• pull / test-llama-runner-linux (bf16, cmake, portable) / linux-job (gh)
  RuntimeError: Command docker exec -t 492dbacfa16e0ddec983348af695a9d42a21f20cbc59ffaad4f182d6fb13a2c1 /exec failed with exit code 1
• pull / test-llama-runner-linux (fp32, buck2, portable) / linux-job (gh)
  RuntimeError: Command docker exec -t d43876e80e87f2331e47f021b554acfce5c9b5c861dee664d62c4e7baa171376 /exec failed with exit code 1
• pull / test-llama-runner-linux (fp32, cmake, portable) / linux-job (gh)
  RuntimeError: Command docker exec -t b1b0578b94ddc6bc25e3b4e63e1389c3438148f5f2b7944412ec5142a2336e84 /exec failed with exit code 1

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This pull request was exported from Phabricator. Differential Revision: D64156864