SoftPlus operation implementation (#1365)

ngraph/python/src/ngraph/__init__.py

@@ -149,6 +149,7 @@ from ngraph.opset4 import sign
 from ngraph.opset4 import sin
 from ngraph.opset4 import sinh
 from ngraph.opset4 import softmax
+from ngraph.opset4 import softplus
 from ngraph.opset4 import space_to_batch
 from ngraph.opset4 import space_to_depth
 from ngraph.opset4 import split

ngraph/python/src/ngraph/opset4/__init__.py

@@ -137,6 +137,7 @@ from ngraph.opset1.ops import sign
 from ngraph.opset1.ops import sin
 from ngraph.opset1.ops import sinh
 from ngraph.opset1.ops import softmax
+from ngraph.opset4.ops import softplus
 from ngraph.opset2.ops import space_to_batch
 from ngraph.opset1.ops import space_to_depth
 from ngraph.opset1.ops import split

ngraph/python/src/ngraph/opset4/ops.py

@@ -139,6 +139,16 @@ def non_max_suppression(
     return _get_node_factory_opset4().create("NonMaxSuppression", inputs, attributes)
 
 
+@nameable_op
+def softplus(data: NodeInput, name: Optional[str] = None) -> Node:
+    """Apply SoftPlus operation on each element of input tensor.
+
+    :param data: The tensor providing input data.
+    :return: The new node with SoftPlus operation applied on each element.
+    """
+    return _get_node_factory_opset4().create("SoftPlus", as_nodes(data), {})
+
+
 @nameable_op
 def mish(data: NodeInput, name: Optional[str] = None,) -> Node:
     """Return a node which performs Mish.