123 lines
5.2 KiB
Markdown
123 lines
5.2 KiB
Markdown
## BinaryConvolution<a name="BinaryConvolution"></a> {#openvino_docs_ops_convolution_BinaryConvolution_1}
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**Versioned name**: *BinaryConvolution-1*
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**Category**: *Convolution*
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**Short description**: Computes 2D convolution of binary input and binary kernel tensors.
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**Detailed description**: The operation behaves as regular *Convolution* but uses specialized algorithm for computations on binary data. More thorough explanation can be found in [Understanding Binary Neural Networks](https://sushscience.wordpress.com/2017/10/01/understanding-binary-neural-networks/) and [Bitwise Neural Networks](https://saige.sice.indiana.edu/wp-content/uploads/icml2015_mkim.pdf).
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Computation algorithm for mode *xnor-popcount*:
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- `X = XNOR(input_patch, filter)`, where XNOR is bitwise operation on two bit streams
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- `P = popcount(X)`, where popcount is the number of `1` bits in the `X` bit stream
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- `Output = 2 * P - B`, where `B` is the total number of bits in the `P` bit stream
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**Attributes**:
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* *strides*
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* **Description**: *strides* is a distance (in pixels) to slide the filter on the feature map over the `(y, x)` axes for 2D convolutions. For example, *strides* equal `2,1` means sliding the filter 2 pixel at a time over height dimension and 1 over width dimension.
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* **Range of values**: integer values starting from 0
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* **Type**: int[]
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* **Required**: *yes*
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* *pads_begin*
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* **Description**: *pads_begin* is a number of pixels to add to the beginning along each axis. For example, *pads_begin* equal `1,2` means adding 1 pixel to the top of the input and 2 to the left of the input.
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* **Range of values**: integer values starting from 0
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* **Type**: int[]
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* **Required**: *yes*
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* **Note**: the attribute is ignored when *auto_pad* attribute is specified.
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* *pads_end*
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* **Description**: *pads_end* is a number of pixels to add to the ending along each axis. For example, *pads_end* equal `1,2` means adding 1 pixel to the bottom of the input and 2 to the right of the input.
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* **Range of values**: integer values starting from 0
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* **Type**: int[]
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* **Required**: *yes*
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* **Note**: the attribute is ignored when *auto_pad* attribute is specified.
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* *dilations*
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* **Description**: *dilations* denotes the distance in width and height between elements (weights) in the filter. For example, *dilation* equal `1,1` means that all the elements in the filter are neighbors, so it is the same as for the usual convolution. *dilation* equal `2,2` means that all the elements in the filter are matched not to adjacent elements in the input matrix, but to those that are adjacent with distance 1.
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* **Range of values**: integer value starting from 0
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* **Type**: int[]
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* **Required**: *yes*
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* *mode*
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* **Description**: *mode* defines how input tensor `0/1` values and weights `0/1` are interpreted as real numbers and how the result is computed.
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* **Range of values**:
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* *xnor-popcount*
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* **Type**: `string`
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* **Required**: *yes*
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* **Note**: value `0` in inputs is interpreted as `-1`, value `1` as `1`
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* *pad_value*
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* **Description**: *pad_value* is a floating-point value used to fill pad area.
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* **Range of values**: a floating-point number
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* **Type**: `float`
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* **Required**: *yes*
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* *auto_pad*
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* **Description**: *auto_pad* how the padding is calculated. Possible values:
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* *explicit* - use explicit padding values from *pads_begin* and *pads_end*.
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* *same_upper* - the input is padded to match the output size. In case of odd padding value an extra padding is added at the end.
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* *same_lower* - the input is padded to match the output size. In case of odd padding value an extra padding is added at the beginning.
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* *valid* - do not use padding.
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* **Type**: string
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* **Default value**: explicit
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* **Required**: *no*
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* **Note**: *pads_begin* and *pads_end* attributes are ignored when *auto_pad* is specified.
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**Inputs**:
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* **1**: Input tensor of type *T1* and rank 4. Layout is `[N, C_IN, Y, X]` (number of batches, number of channels, spatial axes Y, X). **Required.**
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* **2**: Kernel tensor of type *T2* and rank 4. Layout is `[C_OUT, C_IN, Y, X]` (number of output channels, number of input channels, spatial axes Y, X). **Required.**
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* **Note**: Interpretation of tensor values is defined by *mode* attribute.
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**Outputs**:
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* **1**: Output tensor of type *T3* and rank 4. Layout is `[N, C_OUT, Y, X]` (number of batches, number of kernel output channels, spatial axes Y, X).
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**Types**:
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* *T1*: any numeric type with values `0` or `1`.
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* *T2*: `u1` type with binary values `0` or `1`.
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* *T3*: *T1* type with full range of values.
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**Example**:
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2D Convolution
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```xml
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<layer type="BinaryConvolution" ...>
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<data dilations="1,1" pads_begin="2,2" pads_end="2,2" strides="1,1" mode="xnor-popcount" pad_value="0" auto_pad="explicit"/>
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<input>
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<port id="0">
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<dim>1</dim>
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<dim>3</dim>
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<dim>224</dim>
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<dim>224</dim>
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</port>
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<port id="1">
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<dim>64</dim>
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<dim>3</dim>
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<dim>5</dim>
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<dim>5</dim>
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</port>
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</input>
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<output>
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<port id="2" precision="FP32">
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<dim>1</dim>
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<dim>64</dim>
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<dim>224</dim>
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<dim>224</dim>
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</port>
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</output>
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</layer>
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```
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