# Unsqueeze {#openvino_docs_ops_shape_Unsqueeze_1}

**Versioned name**: *Unsqueeze-1*

**Category**: *Shape manipulation*

**Short description**: *Unsqueeze* adds dimensions of size 1 to the first input tensor. The second input value specifies a list of dimensions that will be inserted. Indices specify dimensions in the output tensor.

**Attributes**: *Unsqueeze* operation doesn't have attributes.

**Inputs**:

*   **1**: Tensor of type *T* and arbitrary shape. **Required.**

*   **2**: Scalar or 1D tensor of type *T_INT* with indices of dimensions to unsqueeze. Values could be negative (have to be from range `[-R, R-1]`, where `R` is the rank of the output). **Required.**

**Outputs**:

*   **1**: Tensor with unsqueezed values of type *T*.

**Types**

* *T*: any numeric type.

* *T_INT*: any supported integer type.

**Example**

*Example 1: unsqueeze 2D tensor to a 4D tensor*
```xml
<layer ... type="Unsqueeze">
    <input>
        <port id="0">
            <dim>2</dim>
            <dim>3</dim>
        </port>
    </input>
    <input>
        <port id="1">
            <dim>2</dim>  <!-- value is [0, 3] -->
        </port>
    </input>
    <output>
        <port id="2">
            <dim>1</dim>
            <dim>2</dim>
            <dim>3</dim>
            <dim>1</dim>
        </port>
    </output>
</layer>
```

*Example 2: unsqueeze 0D tensor (constant) to 1D tensor*
```xml
<layer ... type="Unsqueeze">
    <input>
        <port id="0">
        </port>
    </input>
    <input>
        <port id="1">
            <dim>1</dim>  <!-- value is [0] -->
        </port>
    </input>
    <output>
        <port id="2">
            <dim>1</dim>
        </port>
    </output>
</layer>
```