SoftMax-8 specification (#7911)

* prepared the specification

* updated versioned name

* fixed op number in link

docs/doxygen/ie_docs.xml

@@ -262,6 +262,7 @@ limitations under the License.
                 <tab type="user" title="Sin-1" url="@ref openvino_docs_ops_arithmetic_Sin_1"/>
                 <tab type="user" title="Sinh-1" url="@ref openvino_docs_ops_arithmetic_Sinh_1"/>
                 <tab type="user" title="SoftMax-1" url="@ref openvino_docs_ops_activation_SoftMax_1"/>
+                <tab type="user" title="SoftMax-8" url="@ref openvino_docs_ops_activation_SoftMax_8"/>
                 <tab type="user" title="SoftPlus-4" url="@ref openvino_docs_ops_activation_SoftPlus_4"/>
                 <tab type="user" title="SpaceToBatch-2" url="@ref openvino_docs_ops_movement_SpaceToBatch_2"/>
                 <tab type="user" title="SpaceToDepth-1" url="@ref openvino_docs_ops_movement_SpaceToDepth_1"/>

docs/ops/activation/SoftMax_8.md

@@ -0,0 +1,45 @@
+## SoftMax <a name="SoftMax"></a> {#openvino_docs_ops_activation_SoftMax_8}
+
+**Versioned name**: *SoftMax-8*
+
+**Category**: *Activation function*
+
+**Short description**: [Reference](https://github.com/Kulbear/deep-learning-nano-foundation/wiki/ReLU-and-Softmax-Activation-Functions#softmax)
+
+**Detailed description**: [Reference](http://cs231n.github.io/linear-classify/#softmax)
+
+**Attributes**
+
+* *axis*
+
+  * **Description**: *axis* represents the axis of which the *SoftMax* is calculated. Negative value means counting 
+                     dimensions from the back. *axis* equal 1 is a default value.
+  * **Range of values**: `[-rank, rank - 1]`
+  * **Type**: int
+  * **Default value**: 1
+  * **Required**: *no*
+
+**Mathematical Formulation**
+
+\f[
+y_{c} = \frac{e^{Z_{c}}}{\sum_{d=1}^{C}e^{Z_{d}}}
+\f]
+where \f$C\f$ is a size of tensor along *axis* dimension.
+
+**Inputs**:
+
+*   **1**: Input tensor with enough number of dimension to be compatible with *axis* attribute. **Required.**
+
+**Outputs**:
+
+*   **1**: The resulting tensor of the same shape and type as input tensor.
+
+**Example**
+
+```xml
+<layer ... type="SoftMax" ... >
+    <data axis="1" />
+    <input> ... </input>
+    <output> ... </output>
+</layer>
+```

docs/ops/opset8.md

@@ -152,7 +152,7 @@ declared in `namespace opset8`.
 * [Sign](arithmetic/Sign_1.md)
 * [Sin](arithmetic/Sin_1.md)
 * [Sinh](arithmetic/Sinh_1.md)
-* [SoftMax](activation/SoftMax_1.md)
+* [SoftMax](activation/SoftMax_8.md)
 * [SoftPlus](activation/SoftPlus_4.md)
 * [SpaceToBatch](movement/SpaceToBatch_2.md)
 * [SpaceToDepth](movement/SpaceToDepth_1.md)