Tweak/add kind to gelu benchmark name (#1533)

* Add kind to gelu benchmark name

* [backend-comparison] Compute column size in benchmarks report

backend-comparison/benches/custom_gelu.rs

@@ -27,10 +27,9 @@ impl<B: Backend, const D: usize> Benchmark for CustomGeluBenchmark<B, D> {
 
     fn name(&self) -> String {
         match self.autodiff {
-            true => "gelu_autodiff",
+            true => format!("gelu_autodiff_{:?}", self.kind),
-            false => "gelu",
+            false => format!("gelu_{:?}", self.kind),
         }
-        .into()
     }
 
     fn options(&self) -> Option<String> {

backend-comparison/src/persistence/base.rs

@@ -242,20 +242,33 @@ pub(crate) struct BenchmarkCollection {
 
 impl Display for BenchmarkCollection {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        // Compute the max length for each column
+        let mut max_name_len = 0;
+        let mut max_backend_len = 0;
+        for record in self.records.iter() {
+            let backend_name = [record.backend.clone(), record.device.clone()].join("-");
+            max_name_len = max_name_len.max(record.results.name.len());
+            max_backend_len = max_backend_len.max(backend_name.len());
+        }
+        // Header
         writeln!(
             f,
-            "| {0:<15}| {1:<35}| {2:<15}|\n|{3:-<16}|{4:-<36}|{5:-<16}|",
+            "| {:<width_name$} | {:<width_backend$} | Median         |\n|{:->width_name$}--|{:->width_backend$}--|----------------|",
-            "Benchmark", "Backend", "Median", "", "", ""
+            "Benchmark", "Backend", "", "", width_name = max_name_len, width_backend = max_backend_len
         )?;
+        // Table entries
         for record in self.records.iter() {
-            let backend = [record.backend.clone(), record.device.clone()].join("-");
+            let backend_name = [record.backend.clone(), record.device.clone()].join("-");
             writeln!(
                 f,
-                "| {0:<15}| {1:<35}| {2:<15.3?}|",
+                "| {:<width_name$} | {:<width_backend$} | {:<15.3?}|",
-                record.results.name, backend, record.results.computed.median
+                record.results.name,
+                backend_name,
+                record.results.computed.median,
+                width_name = max_name_len,
+                width_backend = max_backend_len
             )?;
         }
-
         Ok(())
     }
 }