revise ../docs/ops/arithmetic/Atanh_3.md

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**Category**: Arithmetic unary operation
**Short description**: *Atanh* performs element-wise hyperbolic inverse tangent (arctangenth) operation with given tensor.
**Short description**: *Atanh* performs element-wise hyperbolic inverse tangent (arctangenth) operation with a given tensor.
**Attributes**:
**Detailed description**: *Atanh* performs element-wise hyperbolic inverse tangent (arctangenth) operation on a given input tensor, based on the following mathematical formula:
No attributes available.
\f[ a_{i} = atanh(a_{i}) \f]
**Attributes**: Atanh operation has no attributes.
**Inputs**
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**Outputs**
* **1**: The result of element-wise atanh operation. A tensor of type *T*.
* **1**: The result of element-wise atanh operation applied to the input tensor. A tensor of type *T* and the same shape as input tensor.
**Types**
* *T*: any floating point type.
*Atanh* does the following with the input tensor *a*:
\f[
a_{i} = atanh(a_{i})
\f]
* *T*: any supported numeric type.
**Examples**
*Example 1*
```xml
<layer ... type="Atanh">
<input>