ReverseSequence specification refactored (#7112)

* ReverseSequence specification refactored

* Change attribute description to avoid confusion

* Allow seq_lenghts input to be of floating-point precision

docs/ops/movement/ReverseSequence_1.md

@@ -2,35 +2,45 @@
 
 **Versioned name**: *ReverseSequence-1*
 
-**Category**: data movement operation
+**Category**: *Data movement*
 
 **Short description**: *ReverseSequence* reverses variable length slices of data.
 
-**Detailed description**: *ReverseSequence* slices input along the dimension specified in the *batch_axis*, and for each slice *i*, reverses the first *lengths[i]* (the second input) elements along the dimension specified in the *seq_axis*.
+**Detailed description**
+
+*ReverseSequence* slices a given input tensor `data` along the dimension specified in the *batch_axis* attribute. For each slice `i`, it reverses the first `seq_lengths[i]` elements along the dimension specified in the *seq_axis* attribute.
 
 **Attributes**
 
 * *batch_axis*
 
-  * **Description**: *batch_axis* is the index of the batch dimension.
-  * **Range of values**: an integer. Can be negative.
+  * **Description**: *batch_axis* is the index of the batch dimension along which `data` input tensor is sliced.
+  * **Range of values**: an integer within the range `[-rank(data), rank(data) - 1]`
   * **Type**: `int`
-  * **Default value**: 0
+  * **Default value**: `0`
   * **Required**: *no*
 
 * *seq_axis*
 
-  * **Description**: *seq_axis* is the index of the sequence dimension.
-  * **Range of values**: an integer. Can be negative.
+  * **Description**: *seq_axis* is the index of the sequence dimension along which elements of `data` input tensor are reversed.
+  * **Range of values**: an integer within the range `[-rank(data), rank(data) - 1]`
   * **Type**: `int`
-  * **Default value**: 1
+  * **Default value**: `1`
   * **Required**: *no*
 
-**Inputs**:
+**Inputs**
 
-*   **1**: tensor with input data to reverse. **Required.**
+* **1**: `data` - Input data to reverse. A tensor of type *T1* and rank greater or equal to 2. **Required.**
+* **2**: `seq_lengths` - Sequence lengths to reverse in the input tensor `data`. A 1D tensor comprising `data_shape[batch_axis]` elements of type *T2*. All element values must be integer values within the range `[1, data_shape[seq_axis]]`. Value `1` means, no elements are reversed. **Required.**
 
-*   **2**: 1D tensor populated with integers with sequence lengths in the 1st input tensor. **Required.**
+**Outputs**
+
+* **1**: The result of slice and reverse `data` input tensor. A tensor of type *T1* and the same shape as `data` input tensor.
+
+**Types**
+
+* *T1*: any supported type.
+* *T2*: any supported numerical type.
 
 **Example**
 
@@ -38,19 +48,19 @@
 <layer ... type="ReverseSequence">
     <data batch_axis="0" seq_axis="1"/>
     <input>
-        <port id="0">
-            <dim>3</dim>
-            <dim>10</dim>
+        <port id="0">       <!-- data -->
+            <dim>4</dim>    <!-- batch_axis -->
+            <dim>10</dim>   <!-- seq_axis -->
             <dim>100</dim>
             <dim>200</dim>
         </port>
         <port id="1">
-            <dim>3</dim>
+            <dim>4</dim>    <!-- seq_lengths value: [2, 4, 8, 10] -->
         </port>
      </input>
     <output>
         <port id="2">
-            <dim>3</dim>
+            <dim>4</dim>
             <dim>10</dim>
             <dim>100</dim>
             <dim>200</dim>