Add i64-abs. (#1216)

candle-core/src/op.rs

@@ -536,7 +536,6 @@ unary_op!(Log, "log", v, v.ln(), vs_ln, vd_ln);
 unary_op!(Sin, "sin", v, v.sin(), vs_sin, vd_sin);
 unary_op!(Cos, "cos", v, v.cos(), vs_cos, vd_cos);
 unary_op!(Tanh, "tanh", v, v.tanh(), vs_tanh, vd_tanh);
-unary_op!(Abs, "abs", v, v.abs());
 unary_op!(Neg, "neg", v, -v);
 unary_op!(Recip, "recip", v, v.recip());
 unary_op!(Sqr, "sqr", v, v * v, vs_sqr, vd_sqr);
@@ -666,6 +665,40 @@ impl UnaryOpT for Erf {
     }
 }
 
+impl UnaryOpT for Abs {
+    const NAME: &'static str = "abs";
+    const KERNEL: &'static str = "uabs";
+    const V: Self = Abs;
+    #[inline(always)]
+    fn bf16(v: bf16) -> bf16 {
+        v.abs()
+    }
+    #[inline(always)]
+    fn f16(v: f16) -> f16 {
+        v.abs()
+    }
+    #[inline(always)]
+    fn f32(v: f32) -> f32 {
+        v.abs()
+    }
+    #[inline(always)]
+    fn f64(v: f64) -> f64 {
+        v.abs()
+    }
+    #[inline(always)]
+    fn u8(v: u8) -> u8 {
+        v
+    }
+    #[inline(always)]
+    fn u32(v: u32) -> u32 {
+        v
+    }
+    #[inline(always)]
+    fn i64(v: i64) -> i64 {
+        v.abs()
+    }
+}
+
 impl UnaryOpT for Ceil {
     const NAME: &'static str = "ceil";
     const KERNEL: &'static str = "uceil";

candle-core/tests/tensor_tests.rs

@@ -1089,3 +1089,11 @@ fn pad_with_same() -> Result<()> {
     );
     Ok(())
 }
+
+#[test]
+fn i64_abs() -> Result<()> {
+    let t = Tensor::new(&[-42i64, 1337], &Device::Cpu)?;
+    let t = t.abs()?;
+    assert_eq!(t.to_vec1::<i64>()?, [42, 1337]);
+    Ok(())
+}