FEATURE
DEV
* implement single tensor input

* add tests

* add comment, deallocate tensor

* fix lint

* add test model for gpu

* add comment for tf_Graph

* address comments

* fix lint

* add doc for helper function

* save

* save

* check in test objects

* fix format

* use tensor name in signatureDef

* address comments

* fix lint

* address comments

* fix lint

* join by ,