* init remove cond_op infershape

* optimize code

* add PrepareDataForSubnet and MergeDataFromSubnet

They were using float64 for FP32 kernel before.

* Adding support for the sigmoid_cross_entropy_with_logits operator

* Fixing a typo in the cuda file

* Adding Python documentation for sigmoid_cross_entropy_with_logits_op

* Correcting typos in documentation

* Adding unit tests for sigmoid_cross_entropy_with_logits_op

* Addressing code review feedback

User StridedMemCpy in Concat/Split Op

InferShape in Operator should be performed in OperatorBase::Run.

* cond_op, recurrent_op and mnist might be changed in following PR

Elementwise operator add/sub/mul/div