Added Scaled Exponential Linear Unit Activation Function (#9027)

* Added Scaled Exponential Linear Unit Activation Function

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* Update scaled_exponential_linear_unit.py

* Update scaled_exponential_linear_unit.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Update scaled_exponential_linear_unit.py

* Update scaled_exponential_linear_unit.py

* Update scaled_exponential_linear_unit.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Update scaled_exponential_linear_unit.py

* Update scaled_exponential_linear_unit.py

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