Disable autodownload by default

.ci/linux-steps.yaml

@@ -9,7 +9,7 @@ steps:
   inputs:
     versionSpec: '3.7'
 
-# Install build dependencies
+# Install build dependencies.
 - script: |
     git clone --depth 1 https://github.com/mlpack/jenkins-conf.git conf
 
@@ -42,9 +42,26 @@ steps:
         sudo make install && \
         cd ..
 
+    # Install ensmallen.
+    wget https://ensmallen.org/files/ensmallen-latest.tar.gz
+        tar -xvzpf ensmallen-latest.tar.gz # Unpack into ensmallen-*/.
+        cd ensmallen-* && \
+        sudo cp -vr include/* /usr/include/ && \
+        cd ..
+
+    # Install STB.
+    wget https://mlpack.org/files/stb.tar.gz
+        tar -xvzpf stb.tar.gz # Unpack into stb/.
+        cd stb &&\
+        sudo cp -vr include/* /usr/include/ && \
+        cd ..
+
     # Install cereal.
     wget https://github.com/USCiLab/cereal/archive/v1.3.0.tar.gz
-    tar -xvzpf v1.3.0.tar.gz # Unpack into cereal-1.3.0/.
+        tar -xvzpf v1.3.0.tar.gz # Unpack into cereal-1.3.0/.
+        cd cereal-1.3.0 && \
+        sudo cp -vr include/cereal /usr/include/ && \
+        cd ..
 
   displayName: 'Install Build Dependencies'
 
@@ -56,7 +73,7 @@ steps:
       export GOPATH=$PWD/src/mlpack/bindings/go
       go get -u -t gonum.org/v1/gonum/...
     fi
-    cmake $(CMakeArgs) -DPYTHON_EXECUTABLE=`which python` -DCEREAL_INCLUDE_DIR=../cereal-1.3.0/include/ ..
+    cmake $(CMakeArgs) -DPYTHON_EXECUTABLE=`which python` -DCEREAL_INCLUDE_DIR=/usr/include/ ..
   displayName: 'CMake'
 
 # Build mlpack

.ci/macos-steps.yaml

@@ -14,7 +14,7 @@ steps:
     set -e
     sudo xcode-select --switch /Applications/Xcode_12.2.app/Contents/Developer
     unset BOOST_ROOT
-    brew install libomp openblas armadillo boost cereal
+    brew install libomp openblas armadillo boost cereal ensmallen
 
     if [ "$(binding)" == "python" ]; then
       pip install --upgrade pip
@@ -25,6 +25,13 @@ steps:
       brew install --cask julia
     fi
 
+    # Install STB.
+    wget https://mlpack.org/files/stb.tar.gz
+        tar -xvzpf stb.tar.gz # Unpack into stb/.
+        cd stb &&\
+        sudo cp -vr include/* /usr/include/ && \
+        cd ..
+
     git clone --depth 1 https://github.com/mlpack/jenkins-conf.git conf
   displayName: 'Install Build Dependencies'
 

.ci/windows-steps.yaml

@@ -12,8 +12,8 @@ steps:
     nuget install boost -o $(Agent.ToolsDirectory) -Version 1.60.0
     nuget install boost_random-vc140 -o $(Agent.ToolsDirectory) -Version 1.60.0
     nuget install boost_math_c99-vc140 -o $(Agent.ToolsDirectory) -Version 1.60.0
-    nuget install OpenBLAS -o $(Agent.ToolsDirectory)
     nuget install unofficial-flayan-cereal -o $(Agent.ToolsDirectory)
+    nuget install ensmallen:x64-windows -o $(Agent.ToolsDirectory)
 
     mkdir -p $(Agent.ToolsDirectory)/boost_libs
     cp $(Agent.ToolsDirectory)/boost_math_c99-vc140.1.60.0.0/lib/native/address-model-64/lib/*.* $(Agent.ToolsDirectory)/boost_libs
@@ -62,6 +62,7 @@ steps:
     -DBOOST_INCLUDEDIR=$(Agent.ToolsDirectory)\boost.1.60.0.0\lib\native\include `
     -DBOOST_LIBRARYDIR=$(Agent.ToolsDirectory)\boost_libs `
     -DCEREAL_INCLUDE_DIR=$(Agent.ToolsDirectory)\unofficial-flayan-cereal.1.2.2\build\native\include `
+    -DENSMALLEN_INCLUDE_DIR=$(Agent.ToolsDirectory)\ensmallen.2.16.2\include`
     -DBUILD_JULIA_BINDINGS=OFF `
     -DCMAKE_BUILD_TYPE=Release ..
   displayName: 'Configure mlpack'

CMakeLists.txt

@@ -14,7 +14,7 @@ option(ARMA_EXTRA_DEBUG "Compile with extra Armadillo debugging symbols." OFF)
 option(TEST_VERBOSE "Run test cases with verbose output." OFF)
 option(BUILD_TESTS "Build tests." ON)
 option(BUILD_CLI_EXECUTABLES "Build command-line executables." ON)
-option(DISABLE_DOWNLOADS "Disable downloads of dependencies during build." OFF)
+option(DISABLE_DOWNLOADS "Disable downloads of dependencies during build." ON)
 option(BUILD_GO_SHLIB "Build Go shared library." OFF)
 option(BUILD_DOCS "Build doxygen documentation (if doxygen is available)." ON)