added prelu onnx operator

crates/burn-import/onnx-tests/tests/prelu/prelu.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+
+# used to generate model: prelu.onnx
+
+import torch
+import torch.nn as nn
+
+
+class Model(nn.Module):
+    def __init__(self):
+        super(Model, self).__init__()
+        self.relu1 = nn.PReLU()
+
+    def forward(self, x):
+        x = self.relu1(x)
+        return x
+
+
+def main():
+
+    # Set seed for reproducibility
+    torch.manual_seed(42)
+
+    torch.set_printoptions(precision=8)
+
+    # Export to onnx
+    model = Model()
+    model.eval()
+    device = torch.device("cpu")
+
+    file_name = "prelu.onnx"
+    test_input = torch.randn(2, 3, device=device)
+    torch.onnx.export(model, test_input, file_name,
+                      verbose=False, opset_version=16)
+
+    print("Finished exporting model to {}".format(file_name))
+
+    # Output some test data for use in the test
+    print("Test input data of ones: {}".format(test_input))
+    print("Test input data shape of ones: {}".format(test_input.shape))
+    output = model.forward(test_input)
+    print("Test output data shape: {}".format(output.shape))
+
+    print("Test output: {}".format(output))
+
+
+if __name__ == '__main__':
+    main()
+

crates/burn-import/src/burn/node/base.rs

@@ -1,5 +1,6 @@
 use super::layer_norm::LayerNormNode;
 use super::mask_where::WhereNode;
+use super::prelu::PReluNode;
 use super::unsqueeze::UnsqueezeNode;
 use super::{
     avg_pool2d::AvgPool2dNode, batch_norm::BatchNormNode, binary::BinaryNode, clip::ClipNode,
@@ -85,6 +86,7 @@ pub enum Node<PS: PrecisionSettings> {
     Conv1d(Conv1dNode<PS>),
     Conv2d(Conv2dNode<PS>),
     ConvTranspose2d(ConvTranspose2dNode<PS>),
+    PRelu(PReluNode<PS>),
     Dropout(DropoutNode),
     Gather(GatherNode),
     GlobalAvgPool(GlobalAvgPoolNode),
@@ -111,6 +113,7 @@ macro_rules! match_all {
             Node::Conv1d(node) => $func(node),
             Node::Conv2d(node) => $func(node),
             Node::ConvTranspose2d(node) => $func(node),
+            Node::PRelu(node) => $func(node),
             Node::Dropout(node) => $func(node),
             Node::Gather(node) => $func(node),
             Node::GlobalAvgPool(node) => $func(node),
@@ -147,6 +150,7 @@ impl<PS: PrecisionSettings> Node<PS> {
             Node::Conv1d(_) => "conv1d",
             Node::Conv2d(_) => "conv2d",
             Node::ConvTranspose2d(_) => "conv_transpose2d",
+            Node::PRelu(_) => "prelu",
             Node::Dropout(_) => "dropout",
             Node::Gather(_) => "gather",
             Node::GlobalAvgPool(_) => "global_avg_pool",

crates/burn-import/src/burn/node/mod.rs

@@ -17,6 +17,7 @@ pub(crate) mod linear;
 pub(crate) mod mask_where;
 pub(crate) mod matmul;
 pub(crate) mod max_pool2d;
+pub(crate) mod prelu;
 pub(crate) mod reshape;
 pub(crate) mod unary;
 pub(crate) mod unsqueeze;

crates/burn-import/src/burn/node/prelu.rs

@@ -0,0 +1,100 @@
+use super::{Node, NodeCodegen, SerializationBackend};
+use crate::burn::{BurnImports, OtherType, Scope, TensorType, ToTokens, Type};
+use burn::{
+    module::{Param, ParamId},
+    nn::{PReluConfig, PReluRecord},
+    record::{PrecisionSettings, Record},
+    tensor::{DataSerialize, Tensor},
+};
+use proc_macro2::TokenStream;
+use quote::quote;
+use serde::Serialize;
+
+#[derive(Clone, Debug)]
+pub struct PReluNode<PS: PrecisionSettings> {
+    pub field: OtherType,
+    pub input: TensorType,
+    pub output: TensorType,
+    pub alpha: DataSerialize<PS::FloatElem>,
+    pub config: PReluConfig,
+}
+
+impl<PS: PrecisionSettings> PReluNode<PS> {
+    pub fn new<S: AsRef<str>>(
+        name: S,
+        input: TensorType,
+        output: TensorType,
+        alpha: DataSerialize<PS::FloatElem>,
+        config: PReluConfig,
+    ) -> Self {
+        Self {
+            field: OtherType::new(
+                name,
+                quote! {
+                    PRelu<B>
+                },
+            ),
+            input,
+            output,
+            alpha,
+            config,
+        }
+    }
+}
+
+impl<PS: PrecisionSettings> NodeCodegen<PS> for PReluNode<PS> {
+    fn input_types(&self) -> Vec<Type> {
+        vec![Type::Tensor(self.input.clone())]
+    }
+    fn output_types(&self) -> Vec<Type> {
+        vec![Type::Tensor(self.output.clone())]
+    }
+    fn field_type(&self) -> Option<Type> {
+        Some(Type::Other(self.field.clone()))
+    }
+
+    fn field_init(&self) -> Option<TokenStream> {
+        let name = &self.field.name;
+
+        let num_parameters = self.config.num_parameters.to_tokens();
+        let alpha = self.config.alpha.to_tokens();
+        let tokens = quote! {
+            let #name = PReluConfig::new(#num_parameters, #alpha)
+                .init(device);
+        };
+
+        Some(tokens)
+    }
+
+    fn field_serialize<S: serde::Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
+        let device = Default::default();
+        let record = PReluRecord::<SerializationBackend> {
+            alpha: Param::initialized(
+                ParamId::new(),
+                Tensor::from_data(self.alpha.clone().convert(), &device),
+            ),
+        };
+
+        let item = Record::into_item::<PS>(record);
+        item.serialize(serializer)
+    }
+
+    fn forward(&self, scope: &mut Scope, node_position: usize) -> TokenStream {
+        let input = scope.tensor_use_owned(&self.input, node_position);
+        let output = &self.output.name;
+        let field = &self.field.name;
+
+        quote! {
+            let #output = self.#field.forward(#input);
+        }
+    }
+    fn register_imports(&self, imports: &mut BurnImports) {
+        imports.register("burn::nn::PRelu");
+        imports.register("burn::nn::prelu::PRelu");
+        imports.register("burn::nn::prelu::PReluConfig");
+    }
+
+    fn into_node(self) -> Node<PS> {
+        Node::PRelu(self)
+    }
+}

crates/burn-import/src/onnx/op_configuration.rs

@@ -1,7 +1,7 @@
 use burn::nn::{
     conv::{Conv1dConfig, Conv2dConfig, ConvTranspose2dConfig},
     pool::{AvgPool2dConfig, MaxPool2dConfig},
-    BatchNormConfig, DropoutConfig, LayerNormConfig, LinearConfig, PaddingConfig1d,
+    BatchNormConfig, DropoutConfig, LayerNormConfig, LinearConfig, PReluConfig, PaddingConfig1d,
     PaddingConfig2d,
 };
 
@@ -120,6 +120,21 @@ pub fn max_pool2d_config(curr: &Node) -> MaxPool2dConfig {
         .with_padding(padding)
         .with_dilation([dilations[0] as usize, dilations[1] as usize])
 }
+pub fn prelu_config(curr: &Node) -> PReluConfig {
+    let mut alpha = 0.01;
+    let mut num_parameters = 0;
+    for (key, value) in curr.attrs.iter() {
+        match key.as_str() {
+            "alpha" => alpha = value.clone().into_f32(),
+            "num_parameters" => num_parameters = value.clone().into_i32(),
+            _ => {}
+        }
+    }
+
+    PReluConfig::new()
+        .with_num_parameters(num_parameters as usize)
+        .with_alpha(alpha as f64)
+}
 
 pub fn conv_transpose2d_config(curr: &Node) -> ConvTranspose2dConfig {
     let mut attrs = curr.attrs.clone();

crates/burn-import/src/onnx/to_burn.rs

@@ -30,6 +30,7 @@ use crate::{
             mask_where::WhereNode,
             matmul::MatmulNode,
             max_pool2d::MaxPool2dNode,
+            prelu::PReluNode,
             reshape::ReshapeNode,
             unary::UnaryNode,
             unsqueeze::UnsqueezeNode,
@@ -236,6 +237,7 @@ impl OnnxGraph {
                 NodeType::Conv1d => graph.register(Self::conv1d_conversion::<PS>(node)),
                 NodeType::Conv2d => graph.register(Self::conv2d_conversion::<PS>(node)),
                 NodeType::MaxPool2d => graph.register(Self::max_pool2d_conversion(node)),
+                NodeType::PRelu => graph.register(Self::prelu_conversion::<PS>(node)),
                 NodeType::AveragePool2d => graph.register(Self::avg_pool_2d_conversion(node)),
                 NodeType::MatMul => graph.register(Self::matmul_conversion(node)),
                 NodeType::Neg => graph.register(Self::neg_conversion(node)),
@@ -695,6 +697,14 @@ impl OnnxGraph {
         MaxPool2dNode::new(name, input, output, config)
     }
 
+    fn prelu_conversion<PS: PrecisionSettings>(node: Node) -> PReluNode<PS> {
+        let input = node.inputs.first().unwrap().to_tensor_type();
+        let output = node.outputs.first().unwrap().to_tensor_type();
+        let weight = extract_data_serialize::<PS::FloatElem>(1, &node).unwrap();
+        let config = prelu_config(&node);
+        let name = &node.name;
+        PReluNode::<PS>::new(name, input, output, weight, config)
+    }
     fn conv_transpose2d_conversion<PS: PrecisionSettings>(node: Node) -> ConvTranspose2dNode<PS> {
         let input = node.inputs.first().unwrap().to_tensor_type();
         let output = node.outputs.first().unwrap().to_tensor_type();