* revise atan op
* use parametrized vistor API
* use new gtest macros
* Update docs/ops/arithmetic/Atan_1.md
Co-authored-by: Gabriele Galiero Casay <gabriele.galiero.casay@intel.com>
* Update docs/ops/arithmetic/Atan_1.md
Co-authored-by: Gabriele Galiero Casay <gabriele.galiero.casay@intel.com>
* Update ngraph/core/src/op/atan.cpp
Co-authored-by: Gabriele Galiero Casay <gabriele.galiero.casay@intel.com>
* update doc to follow the rules
* create type_prop for atan
* drop op_eval to be covered in backend
* add the missing type prop case
* add integer type ref impl
* fix clang issue
Co-authored-by: Gabriele Galiero Casay <gabriele.galiero.casay@intel.com>