From e85e1cee0f662fe03ec2644330ae81b69502ca7b Mon Sep 17 00:00:00 2001
From: Dennis Kobert <dennis@kobert.dev>
Date: Tue, 25 Mar 2025 19:24:16 +0100
Subject: Build basic inference setup in rust

---
 src/main.rs  | 17 ++++++++++++++++-
 src/model.rs | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+), 1 deletion(-)
 create mode 100644 src/model.rs

(limited to 'src')

diff --git a/src/main.rs b/src/main.rs
index f3d4992..4f7d7a4 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,12 +7,14 @@ mod benchmark;
 mod e_core_selector;
 mod energy;
 mod freq;
+mod model;
 mod scheduler;
 
 #[rustfmt::skip]
 mod bpf;
 
 use anyhow::Result;
+use burn::tensor::Tensor;
 use clap::{Arg, ArgAction, Command};
 use scheduler::Scheduler;
 use std::mem::MaybeUninit;
@@ -46,13 +48,26 @@ fn main() -> Result<()> {
         )
         .get_matches();
 
+    let model = model::load_model();
+    let device = Default::default();
+    let result = model.forward(Tensor::from_floats(
+        [
+            // 2899.97, 21420886., 59226., 148084., 301003., 36244800., 115862107., 43766905.,
+            1533, 1077473, 9448, 4269, 52805, 2456984, 5867215, 3954587,
+        ],
+        // [1., 1., 1., 1., 1., 1., 1., 1.],
+        &device,
+    ));
+
+    println!("result: {}", result);
+
     let power_cap = *matches.get_one::<u64>("power_cap").unwrap_or(&u64::MAX);
     let use_mocking = matches.get_flag("mock");
     let benchmark = matches.get_flag("benchmark");
 
     // Initialize and load the scheduler.
     let mut open_object = MaybeUninit::uninit();
-    let log_path = "logs.csv";
+    let log_path = "/tmp/logs.csv";
     if benchmark {
         let mut sched = BenchmarkScheduler::init(&mut open_object, log_path)?;
         sched.run();
diff --git a/src/model.rs b/src/model.rs
new file mode 100644
index 0000000..04eb6c8
--- /dev/null
+++ b/src/model.rs
@@ -0,0 +1,59 @@
+use burn::{
+    nn::conv::{Conv2d, Conv2dConfig},
+    nn::{Linear, Relu},
+    prelude::*,
+};
+use nn::{LeakyReluConfig, LinearConfig};
+
+use burn::record::{FullPrecisionSettings, NamedMpkFileRecorder, Recorder};
+use burn_import::pytorch::PyTorchFileRecorder;
+
+type ArrayBackend = burn_ndarray::NdArray<f32>;
+
+#[derive(Module, Debug)]
+pub struct Net<B: Backend> {
+    input_lin: Linear<B>,
+    relu1: Relu,
+    lin2: Linear<B>,
+    relu2: Relu,
+    lin3: Linear<B>,
+}
+
+impl<B: Backend> Net<B> {
+    /// Create a new model.
+    pub fn init(device: &B::Device) -> Self {
+        let input_size = 8;
+        let input_lin = LinearConfig::new(input_size, 16).init(device);
+        let relu1 = Relu::new();
+        let lin2 = LinearConfig::new(16, 4).init(device);
+        let relu2 = Relu::new();
+        let lin3 = LinearConfig::new(4, 1).init(device);
+        Self {
+            input_lin,
+            relu1,
+            lin2,
+            relu2,
+            lin3,
+        }
+    }
+
+    /// Forward pass of the model.
+    pub fn forward(&self, x: Tensor<B, 1>) -> Tensor<B, 1> {
+        let x = self.input_lin.forward(x);
+        let x = self.relu1.forward(x);
+        let x = self.lin2.forward(x);
+        let x = self.relu2.forward(x);
+        let x = self.lin3.forward(x);
+        x
+    }
+}
+
+/// Load the model from the file in your source code (not in build.rs or script).
+pub fn load_model() -> Net<ArrayBackend> {
+    let device = Default::default();
+    let record: NetRecord<ArrayBackend> = PyTorchFileRecorder::<FullPrecisionSettings>::default()
+        .load("./perf.pt".into(), &device)
+        .expect("Failed to decode state");
+
+    Net::<ArrayBackend>::init(&device).load_record(record)
+}
-- 
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