Orca spark estimator (intel-analytics#3124)

* Orca spark estimator

* tmp commit

* update pytorch test

* bigdl add load orca ckpt

* update examples

* fix tf estimator

* fix style

* fix openvino

* temp commit

* temp

* meet comments

* meet comments

* meet comments

* meet comments

* add orca optimizer

* remove bigdl optimizer

* fix testcase

* add scheduler

* add scheduler

* fix cifar10

python/dllib/src/bigdl/dllib/estimator/estimator.py

@@ -59,7 +59,7 @@ def set_l2_norm_gradient_clipping(self, clip_norm):
         """
         callZooFunc(self.bigdl_type, "setGradientClippingByL2Norm", self.value, clip_norm)
 
-    def set_tensorboad(self, log_dir, app_name):
+    def set_tensorboard(self, log_dir, app_name):
         """
         Set summary information during the training process for visualization purposes.
         Saved summary can be viewed via TensorBoard.