* Construct HardSigmoid with alpha and beta as inputs

* Switch to the new HardSigmoid constructor entirely

* Broadcast with numpy style in hard sigmoid

* Python bindings adjustment to the new constructor

* Different way of creating constants

* Accept scalars instead of 1D vectors for alpha and beta

* Adjust the python tests to the new HardSigmoid constructor

* Use v1 ops in fused HardSigmoid

* Relax the static shape requirement for alpha and beta

* Fix merge