Display bigdl model in tensorboard (#1545)
Display bigdl model in tensorboard (#1545)

* Display bigdl model in tensorboard

* add document, python API and meet code review.

* meet code review

* meet code review

intel-analytics/BigDL,intel-analytics/BigDL,yangw1234/BigDL,yangw1234/BigDL,yangw1234/BigDL,intel-analytics/BigDL,intel-analytics/BigDL,yangw1234/BigDL