FIX: Move all parallels into parallel feature (#72)

Cargo.toml

@@ -40,20 +40,14 @@ anyhow = "1.0"
 paste = "1.0"
 #num-complex = "0.3"
 netcdf = { version = "0.7", optional = true, default-features = false }
-pyo3 = { version = "0.22", optional = true, features = [
-    "auto-initialize",
-    "gil-refs",
-] }
+pyo3 = { version = "0.22", optional = true, features = ["auto-initialize", "gil-refs"] }
 blas = { version = "0.22", optional = true }
 lapack = { version = "0.19", optional = true }
 serde = { version = "1.0", features = ["derive"], optional = true }
 json = { version = "0.12", optional = true }
-arrow2 = { version = "0.18", features = [
-    "io_parquet",
-    "io_parquet_compression",
-], optional = true }
+arrow2 = { version = "0.18", features = ["io_parquet", "io_parquet_compression"], optional = true }
 num-complex = { version = "0.4", optional = true }
-rayon = "1.10"
+rayon = { version = "1.10", optional = true }
 
 [package.metadata.docs.rs]
 rustdoc-args = ["--html-in-header", "katex-header.html", "--cfg", "docsrs"]
@@ -65,6 +59,7 @@ plot = ["pyo3"]
 nc = ["netcdf"]
 parquet = ["arrow2"]
 complex = ["num-complex", "matrixmultiply/cgemm"]
+parallel = ["rayon"]
 
 [[bench]]
 path = "benches/parallel_rayon/matrix_benchmark.rs"

src/lib.rs

@@ -209,4 +209,5 @@ pub mod util;
 #[cfg(feature = "complex")]
 pub mod complex;
 
+#[cfg(feature = "parallel")]
 extern crate rayon;

src/structure/matrix.rs

@@ -610,21 +610,23 @@ extern crate lapack;
 use blas::{daxpy, dgemm, dgemv};
 #[cfg(feature = "O3")]
 use lapack::{dgecon, dgeqrf, dgesvd, dgetrf, dgetri, dgetrs, dorgqr, dpotrf};
+#[cfg(feature = "parallel")]
 use rayon::iter::{IntoParallelIterator, IntoParallelRefIterator, ParallelIterator};
 #[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
 
 pub use self::Shape::{Col, Row};
 use crate::numerical::eigen::{eigen, EigenMethod};
 use crate::structure::dataframe::{Series, TypedVector};
-use crate::traits::math::{ParallelInnerProduct, ParallelNormed};
 use crate::traits::sugar::ScalableMut;
 use crate::traits::{
     fp::{FPMatrix, FPVector},
     general::Algorithm,
     math::{InnerProduct, LinearOp, MatrixProduct, Norm, Normed, Vector},
     mutable::MutMatrix,
 };
+#[cfg(feature = "parallel")]
+use crate::traits::math::{ParallelInnerProduct, ParallelNormed};
 use crate::util::{
     low_level::{copy_vec_ptr, swap_vec_ptr},
     non_macro::{cbind, eye, rbind, zeros},
@@ -1342,27 +1344,6 @@ impl Matrix {
         mat
     }
 
-    /// From index operations in parallel
-    pub fn par_from_index<F, G>(f: F, size: (usize, usize)) -> Matrix
-    where
-        F: Fn(usize, usize) -> G + Copy + Send + Sync,
-        G: Into<f64>,
-    {
-        let row = size.0;
-        let col = size.1;
-
-        let data = (0..row)
-            .into_par_iter()
-            .flat_map(|i| {
-                (0..col)
-                    .into_par_iter()
-                    .map(|j| f(i, j).into())
-                    .collect::<Vec<f64>>()
-            })
-            .collect::<Vec<f64>>();
-        matrix(data, row, col, Row)
-    }
-
     /// Matrix to `Vec<Vec<f64>>`
     ///
     /// To send `Matrix` to `inline-python`
@@ -1480,6 +1461,28 @@ impl Matrix {
         let v: Vec<f64> = series.to_vec();
         matrix(v, row, col, shape)
     }
+
+    /// From index operations in parallel
+    #[cfg(feature = "parallel")]
+    fn par_from_index<F, G>(f: F, size: (usize, usize)) -> Matrix
+    where
+        F: Fn(usize, usize) -> G + Copy + Send + Sync,
+        G: Into<f64>,
+    {
+        let row = size.0;
+        let col = size.1;
+
+        let data = (0..row)
+            .into_par_iter()
+            .flat_map(|i| {
+                (0..col)
+                    .into_par_iter()
+                    .map(|j| f(i, j).into())
+                    .collect::<Vec<f64>>()
+            })
+            .collect::<Vec<f64>>();
+        matrix(data, row, col, Row)
+    }
 }
 
 // =============================================================================
@@ -1639,6 +1642,7 @@ impl Normed for Matrix {
     }
 }
 
+#[cfg(feature = "parallel")]
 impl ParallelNormed for Matrix {
     type UnsignedScalar = f64;
 
@@ -1716,6 +1720,7 @@ impl InnerProduct for Matrix {
 }
 
 /// Frobenius inner product in parallel
+#[cfg(feature = "parallel")]
 impl ParallelInnerProduct for Matrix {
     fn par_dot(&self, rhs: &Self) -> f64 {
         if self.shape == rhs.shape {

src/structure/vector.rs

@@ -266,13 +266,16 @@
 extern crate blas;
 #[cfg(feature = "O3")]
 use blas::{daxpy, ddot, dnrm2, idamax};
-
-use crate::rayon::prelude::*;
+#[cfg(feature = "parallel")]
+use crate::rayon::iter::ParalleIterator;
 
 use crate::structure::matrix::{matrix, Matrix, Row};
-use crate::traits::fp::ParallelFPVector;
-use crate::traits::math::{ParallelInnerProduct, ParallelNormed, ParallelVectorProduct};
-use crate::traits::mutable::ParallelMutFP;
+#[cfg(feature = "parallel")]
+use crate::traits::{
+    fp::ParallelFPVector,
+    math::{ParallelInnerProduct, ParallelNormed, ParallelVectorProduct},
+    mutable::ParallelMutFP,
+};
 use crate::traits::{
     fp::FPVector,
     general::Algorithm,
@@ -414,6 +417,7 @@ impl FPVector for Vec<f64> {
     }
 }
 
+#[cfg(feature = "parallel")]
 impl ParallelFPVector for Vec<f64> {
     type Scalar = f64;
 
@@ -516,6 +520,7 @@ where
 }
 
 /// Explicit version of `map` in parallel
+#[cfg(feature = "parallel")]
 pub fn par_map<F, T>(f: F, xs: &[T]) -> Vec<T>
 where
     F: Fn(T) -> T + Send + Sync,
@@ -537,7 +542,6 @@ where
         s = f(s, x);
     }
     s
-    // Parallel version: !unimplemented()
 }
 
 /// Explicit version of `zip_with`
@@ -555,6 +559,7 @@ where
 }
 
 /// Explicit version of `zip_with` in parallel
+#[cfg(feature = "parallel")]
 pub fn par_zip_with<F, T>(f: F, xs: &[T], ys: &[T]) -> Vec<T>
 where
     F: Fn(T, T) -> T + Send + Sync,
@@ -588,6 +593,7 @@ impl MutFP for Vec<f64> {
     }
 }
 
+#[cfg(feature = "parallel")]
 impl ParallelMutFP for Vec<f64> {
     type Scalar = f64;
 
@@ -831,6 +837,7 @@ impl Normed for Vec<f64> {
     }
 }
 
+#[cfg(feature = "parallel")]
 impl ParallelNormed for Vec<f64> {
     type UnsignedScalar = f64;
 
@@ -896,6 +903,7 @@ impl InnerProduct for Vec<f64> {
     }
 }
 
+#[cfg(feature = "parallel")]
 impl ParallelInnerProduct for Vec<f64> {
     fn par_dot(&self, rhs: &Self) -> f64 {
         #[cfg(feature = "O3")]
@@ -959,6 +967,7 @@ impl VectorProduct for Vec<f64> {
     }
 }
 
+#[cfg(feature = "parallel")]
 impl ParallelVectorProduct for Vec<f64> {
     fn par_cross(&self, other: &Self) -> Self {
         assert_eq!(self.len(), other.len());

src/traits/fp.rs

@@ -60,6 +60,7 @@ pub trait FPMatrix {
 }
 
 /// Functional Programming tools for Vector in Parallel (Uses Rayon crate)
+#[cfg(feature = "parallel")]
 pub trait ParallelFPVector {
     type Scalar;
 
@@ -79,6 +80,7 @@ pub trait ParallelFPVector {
 }
 
 /// Functional Programming for Matrix in Parallel (Uses Rayon crate)
+#[cfg(feature = "parallel")]
 pub trait ParallelFPMatrix {
     fn par_fmap<F>(&self, f: F) -> Matrix
     where