.. SPDX-FileCopyrightText: 2021 Intel Corporation .. .. SPDX-License-Identifier: CC-BY-4.0 ----- PReLU ----- **Versioned name**: *PReLU-1* **Category**: *Activation* **Short description**: Parametric rectified linear unit element-wise activation function. **Detailed description**: *PReLU* operation is introduced in this article __. *PReLU* performs element-wise *parametric ReLU* operation on a given input tensor, based on the following mathematical formula: .. math:: PReLU(x) = \left\{\begin{array}{r} x \quad \mbox{if } x \geq 0 \\ \alpha x \quad \mbox{if } x < 0 \end{array}\right. **Attributes**: * *data_format* * **Description**: *data_format* denotes the data format of the input and output data. * **Range of values**: *NXC* or *NCX* (X means HW for 2D, DHW for 3D) * **Type**: string * **Default value**: *NXC* * **Required**: *no* * *per_channel_broadcast* * **Description**: *per_channel_broadcast* denotes whether to apply per_channel broadcast when slope is 1D tensor. * **Range of values**: False or True * **Type**: bool * **Default value**: *True* * **Required**: *no* **Inputs**: * **1**: input - input tensor. **Required.** * **Type**: T * **2**: slope - slope tensor. **Required.** * **Type**: T **Outputs** * **1**: output - output tensor. * **Type**: T **Types**: * **T**: f32, f16, bf16 * **Note**: Inputs and outputs have the same data type denoted by *T*. For example, if input is f32 tensor, then all other tensors have f32 data type. **Broadcasting rules**: Only slope tensor supports broadcasting semantics. Slope tensor is uni-directionally broadcasted to *input* if one of the following rules is met: * **1**: slope is 1D tensor and *per_channel_broadcast* is set to True, the length of slope tensor is equal to the length of *input* of channel dimension. * **2**: slope is 1D tensor and *per_channel_broadcast* is set to False, the length of slope tensor is equal to the length of *input* of the rightmost dimension. * **3**: slope is nD tensor, starting from the rightmost dimension, ::math::input.shape[i] == slope.shape[i] or ::math::slope.shape[i] == 1 or slope dimension i is empty.