fix CI and more

Author: Mathieu Lobet

.github/workflows/courses.yml

@@ -14,7 +14,7 @@ jobs:
   changes:
     runs-on: ubuntu-latest
     outputs:
-      output1: ${{ steps.filter.outputs.beginner }}
+      beginner_changed: ${{ steps.filter.outputs.beginner }}
     steps:
     - uses: actions/checkout@v4
     - uses: dorny/paths-filter@v3
@@ -27,7 +27,7 @@ jobs:
 
   build_beginner_course:
     needs: changes
-    if: ${{ needs.changes.outputs.beginner == 'true' }}
+    if: ${{ needs.changes.outputs.beginner_changed == 'true' }}
     runs-on: ubuntu-latest
     steps:
       - name: Set up Git repository

.github/workflows/exercises.yml

@@ -14,7 +14,7 @@ jobs:
   changes:
     runs-on: ubuntu-latest
     outputs:
-      output1: ${{ steps.filter.outputs.workflows }}
+      exercises_changed: ${{ steps.filter.outputs.exercises }}
     steps:
     - uses: actions/checkout@v4
     - uses: dorny/paths-filter@v3
@@ -31,7 +31,7 @@ jobs:
   build_kokkos:
     runs-on: ubuntu-latest
     needs: [changes]
-    if: ${{ needs.changes.outputs.exercises == 'true' }}
+    if: ${{ needs.changes.outputs.exercises_changed == 'true' }}
     steps:
       - name: Set up Git repository
         uses: actions/checkout@v4

.github/workflows/projects.yml

@@ -14,7 +14,7 @@ jobs:
   changes:
     runs-on: ubuntu-latest
     outputs:
-      output1: ${{ steps.filter.outputs.workflows }}
+      projects_changed: ${{ steps.filter.outputs.wave }}
     steps:
     - uses: actions/checkout@v4
     - uses: dorny/paths-filter@v3
@@ -48,7 +48,7 @@ jobs:
   build_wave_projects:
     runs-on: ubuntu-latest
     needs: [build_kokkos, changes]
-    if: ${{ needs.changes.outputs.wave == 'true' }}
+    if: ${{ needs.changes.outputs.projects_changed == 'true' }}
     steps:
       - name: Set up Git repository
         uses: actions/checkout@v4

courses/01_beginners/main.tex

@@ -1380,7 +1380,7 @@ \section{Basic concepts of Kokkos}
 
 \begin{itemize}
     \item \texttt{ExecutionSpace} is an optional template parameter that specifies the execution space, by default the execution space is \texttt{DefaultExecutionSpace}.
-    \item \texttt{start\_index} and \texttt{end\_index} are the beginning and end of the loop
+    \item \texttt{start\_index} and \texttt{end\_index} are the beginning and the end of the loop
 \end{itemize}
 
 \small
@@ -1469,6 +1469,24 @@ \section{Basic concepts of Kokkos}
 
 % _____________________________________________________________________________
 
+\begin{frame}[fragile]
+    \frametitle{Nested parallel loops}
+
+\begin{minted}{C++}
+
+Kokkos::View<int**> my_matrix("matrix", Nx, Ny);
+
+for (int i = 0; i < Nx; i++) {
+    for (int j = 0; j < Ny; j++) {
+        my_matrix(i,j) = i + j;
+    }
+}
+\end{minted}
+
+\end{frame}
+
+% _____________________________________________________________________________
+
 \begin{frame}[fragile]
     \frametitle{Nested parallel loops}
 
@@ -1523,7 +1541,7 @@ \section{Basic concepts of Kokkos}
 
 \begin{itemize}
 \item Parallel reduction is the second loop pattern provided by Kokkos: \highlight{Kokkos::parallel\_reduce}
-\item It is often used to compute from an array a single value (sum, max, min, etc.)
+\item It is often used to compute a single value from an array (sum, max, min, etc.)
 \item It works like the \texttt{parallel\_for} loop pattern but with an additional argument: the reducer operation to perform \highlight{Kokkos::Reducer\_op<type>}
 \item \texttt{KOKKOS\_LAMBDA} also has an additional argument: a reference to the local result
 \end{itemize}
@@ -1588,11 +1606,11 @@ \section{Basic concepts of Kokkos}
 
 \footnotesize
 \begin{minted}{C++}
-    Kokkos::parallel_reduce("my_reduction", N,
-    KOKKOS_LAMBDA(int i, double& local_result) {
-        local_result += A(i);
-    }, result);
-    \end{minted}
+Kokkos::parallel_reduce("my_reduction", N,
+KOKKOS_LAMBDA(int i, double& local_result) {
+    local_result += A(i);
+}, result);
+\end{minted}
 
 \end{frame}
 
@@ -1663,7 +1681,7 @@ \section{Basic concepts of Kokkos}
     \end{itemize}
 
     \begin{block}{}
-        Go to the exercise \texttt{06\_parallel\_reduce} and follow the instructions in the README file
+        Go to the exercise \href{https://github.com/CExA-project/cexa-kokkos-tutorials/tree/main/exercises/06_parallel_reduce}{06\_parallel\_reduce} and follow the instructions in the README file
     \end{block}
 
 \end{frame}