TEST: Add benchmarks for Result<_, ShapeError> methods

Author: bluss

benches/error-handling.rs

@@ -0,0 +1,110 @@
+#![feature(test)]
+#![allow(
+    clippy::many_single_char_names,
+    clippy::deref_addrof,
+    clippy::unreadable_literal,
+    clippy::many_single_char_names
+)]
+extern crate test;
+use test::Bencher;
+
+use ndarray::prelude::*;
+use ndarray::ErrorKind;
+
+// Use ZST elements to remove allocation from the benchmarks
+
+#[derive(Copy, Clone, Debug)]
+struct Zst;
+
+type A4 = Array4<Zst>;
+
+#[bench]
+fn from_elem(bench: &mut Bencher) {
+    bench.iter(|| {
+        A4::from_elem((1, 2, 3, 4), Zst)
+    })
+}
+
+#[bench]
+fn from_shape_vec_ok(bench: &mut Bencher) {
+    bench.iter(|| {
+        let v: Vec<Zst> = vec![Zst; 1 * 2 * 3 * 4];
+        let x = A4::from_shape_vec((1, 2, 3, 4).strides((24, 12, 4, 1)), v);
+        debug_assert!(x.is_ok(), "problem with {:?}", x);
+        x
+    })
+}
+
+#[bench]
+fn from_shape_vec_fail(bench: &mut Bencher) {
+    bench.iter(|| {
+        let v: Vec<Zst> = vec![Zst; 1 * 2 * 3 * 4];
+        let x = A4::from_shape_vec((1, 2, 3, 4).strides((4, 3, 2, 1)), v);
+        debug_assert!(x.is_err());
+        x
+    })
+}
+
+#[bench]
+fn into_shape_fail(bench: &mut Bencher) {
+    let a = A4::from_elem((1, 2, 3, 4), Zst);
+    let v = a.view();
+    bench.iter(|| {
+        v.clone().into_shape((5, 3, 2, 1))
+    })
+}
+
+#[bench]
+fn into_shape_ok_c(bench: &mut Bencher) {
+    let a = A4::from_elem((1, 2, 3, 4), Zst);
+    let v = a.view();
+    bench.iter(|| {
+        v.clone().into_shape((4, 3, 2, 1))
+    })
+}
+
+#[bench]
+fn into_shape_ok_f(bench: &mut Bencher) {
+    let a = A4::from_elem((1, 2, 3, 4).f(), Zst);
+    let v = a.view();
+    bench.iter(|| {
+        v.clone().into_shape((4, 3, 2, 1))
+    })
+}
+
+#[bench]
+fn stack_ok(bench: &mut Bencher) {
+    let a = Array::from_elem((15, 15), Zst);
+    let rows = a.rows().into_iter().collect::<Vec<_>>();
+    bench.iter(|| {
+        let res = ndarray::stack(Axis(1), &rows);
+        debug_assert!(res.is_ok(), "err {:?}", res);
+        res
+    });
+}
+
+#[bench]
+fn stack_err_axis(bench: &mut Bencher) {
+    let a = Array::from_elem((15, 15), Zst);
+    let rows = a.rows().into_iter().collect::<Vec<_>>();
+    bench.iter(|| {
+        let res = ndarray::stack(Axis(2), &rows);
+        debug_assert!(res.is_err());
+        res
+    });
+}
+
+#[bench]
+fn stack_err_shape(bench: &mut Bencher) {
+    let a = Array::from_elem((15, 15), Zst);
+    let rows = a.rows().into_iter()
+        .enumerate()
+        .map(|(i, mut row)| { row.slice_collapse(s![..(i as isize)]); row })
+        .collect::<Vec<_>>();
+    bench.iter(|| {
+        let res = ndarray::stack(Axis(1), &rows);
+        debug_assert!(res.is_err());
+        debug_assert_eq!(res.clone().unwrap_err().kind(), ErrorKind::IncompatibleShape);
+        res
+    });
+}