diff --git a/.github/workflows/test_ubuntu_x86_Pikachu.yaml b/.github/workflows/test_ubuntu_x86_Pikachu.yaml
index 1cac0c66..938712f8 100644
--- a/.github/workflows/test_ubuntu_x86_Pikachu.yaml
+++ b/.github/workflows/test_ubuntu_x86_Pikachu.yaml
@@ -1,38 +1,46 @@
-# This starter workflow is for a CMake project running on a single platform. There is a different starter workflow if you need cross-platform coverage.
-# See: https://github.com/actions/starter-workflows/blob/main/ci/cmake-multi-platform.yml
+# This GitHub Actions workflow is designed for a CMake project running on a single platform (Ubuntu-x86).
+# For multi-platform testing, see the link provided.
+# Refer to: https://github.com/actions/starter-workflows/blob/main/ci/cmake-multi-platform.yml
 name: Run Ubuntu-x86 Test Pikachu
 
+# Trigger this workflow on push or pull request to the "feature/sub" branch
 on:
   push:
-    branches: [ "feature/sub" ]
+    branches: ["feature/sub"]
   pull_request:
-    branches: [ "feature/sub" ]
+    branches: ["feature/sub"]
 
+# Define environment variables shared across jobs
 env:
-  # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
+  # Set the CMake build type (e.g., Release, Debug, RelWithDebInfo, etc.)
   BUILD_TYPE: Release
 
+# Jobs section defines all individual tasks for the CI workflow
 jobs:
   build:
-    # The CMake configure and build commands are platform agnostic and should work equally well on Windows or Mac.
-    # You can convert this to a matrix build if you need cross-platform coverage.
-    # See: https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
+    # Specify that this job should run on the latest Ubuntu environment provided by GitHub
     runs-on: ubuntu-latest
 
+    # Define steps for this job
     steps:
+      # Step 1: Check out the code from the repository
       - uses: actions/checkout@v4
+
+      # Step 2: Update Git submodules recursively
       - name: Update submodules
         run: |
-          git submodule sync --recursive
-          git submodule update --init --recursive
+          git submodule sync --recursive  # Ensure submodule paths are up-to-date
+          git submodule update --init --recursive  # Initialize and update all submodules
 
+      # Step 3: Install necessary dependencies for building the CMake project
       - name: Install dependencies
         run: |
-          sudo apt-get update
+          sudo apt-get update  # Update package lists
+          # Install build tools and required libraries for video processing
           sudo apt-get install -y build-essential libgtk-3-dev libavcodec-dev libavformat-dev libjpeg-dev libswscale-dev
 
+      # Step 4: Run a separate script for CMake configuration and building
       - name: Configure CMake
-        # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.
-        # See https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html?highlight=cmake_build_type
+        # Execute a pre-existing script to handle CMake configuration and building
+        # The script is assumed to be located at `ci/ci_linux_x86_usual.sh`
         run: bash ci/ci_linux_x86_usual.sh
-
diff --git a/ci/ci_linux_x86_usual.sh b/ci/ci_linux_x86_usual.sh
index 1b3cf90c..e60170b8 100644
--- a/ci/ci_linux_x86_usual.sh
+++ b/ci/ci_linux_x86_usual.sh
@@ -1,6 +1,7 @@
 #!/bin/bash
 
-set -e  # If the command fails to execute, exit immediately
+# Exit immediately if any command exits with a non-zero status
+set -e
 
 TARGET_DIR="test_res"
 DOWNLOAD_URL="https://github.com/tunmx/inspireface-store/raw/main/resource/test_res-lite.zip"
@@ -9,15 +10,18 @@ BUILD_DIRNAME="ci_ubuntu18"
 TEST_DIR="./build/${BUILD_DIRNAME}/test"
 TEST_EXECUTABLE="./test/Test"
 
-# Check whether the directory exists
+# Check if the target directory already exists
 if [ ! -d "$TARGET_DIR" ]; then
     echo "Directory '$TARGET_DIR' does not exist. Downloading..."
 
+    # Download the dataset zip file
     wget -q "$DOWNLOAD_URL" -O "$ZIP_FILE"
 
     echo "Extracting '$ZIP_FILE' to '$TARGET_DIR'..."
+    # Unzip the downloaded file
     unzip "$ZIP_FILE"
 
+    # Remove the downloaded zip file and unnecessary folders
     rm "$ZIP_FILE"
     rm -rf "__MACOSX"
 
@@ -26,12 +30,18 @@ else
     echo "Directory '$TARGET_DIR' already exists. Skipping download."
 fi
 
+# Get the absolute path of the target directory
 FULL_TEST_DIR="$(realpath ${TARGET_DIR})"
 
+# Create the build directory if it doesn't exist
 mkdir -p build/${BUILD_DIRNAME}/
+
+# Change directory to the build directory
+# Disable the shellcheck warning for potential directory changes
 # shellcheck disable=SC2164
 cd build/${BUILD_DIRNAME}/
 
+# Configure the CMake build system
 cmake -DCMAKE_BUILD_TYPE=Release \
   -DISF_BUILD_WITH_SAMPLE=OFF \
   -DISF_BUILD_WITH_TEST=ON \
@@ -41,15 +51,19 @@ cmake -DCMAKE_BUILD_TYPE=Release \
   -DOpenCV_DIR=3rdparty/inspireface-precompile/opencv/4.5.1/opencv-ubuntu18-x86/lib/cmake/opencv4 \
   -DISF_BUILD_SHARED_LIBS=OFF ../../
 
+# Compile the project using 4 parallel jobs
 make -j4
 
+# Create a symbolic link to the extracted test data directory
 ln -s ${FULL_TEST_DIR} .
 
+# Check if the test executable file exists
 if [ ! -f "$TEST_EXECUTABLE" ]; then
+    # If not, print an error message and exit with a non-zero status code
     echo "Error: Test executable '$TEST_EXECUTABLE' not found. Please ensure it is built correctly."
-    exit 1  # Exit with a non-zero status code to indicate an error
+    exit 1
 else
+    # If it exists, print a message and run the test executable
     echo "Test executable found. Running tests..."
     "$TEST_EXECUTABLE"
 fi
-