[CUDA] consolidate CUDA versions

.ci/setup.sh

@@ -106,7 +106,7 @@ else  # Linux
             || exit -1
         fi
     fi
-    if [[ $TASK == "cuda" || $TASK == "cuda_exp" ]]; then
+    if [[ $TASK == "cuda" ]]; then
         echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections
         apt-get update
         apt-get install --no-install-recommends -y \

.ci/test.sh

@@ -201,41 +201,24 @@ if [[ $TASK == "gpu" ]]; then
     elif [[ $METHOD == "source" ]]; then
         cmake -DUSE_GPU=ON ..
     fi
-elif [[ $TASK == "cuda" || $TASK == "cuda_exp" ]]; then
-    if [[ $TASK == "cuda" ]]; then
-        sed -i'.bak' 's/std::string device_type = "cpu";/std::string device_type = "cuda";/' $BUILD_DIRECTORY/include/LightGBM/config.h
-        grep -q 'std::string device_type = "cuda"' $BUILD_DIRECTORY/include/LightGBM/config.h || exit -1  # make sure that changes were really done
-    else
-        sed -i'.bak' 's/std::string device_type = "cpu";/std::string device_type = "cuda_exp";/' $BUILD_DIRECTORY/include/LightGBM/config.h
-        grep -q 'std::string device_type = "cuda_exp"' $BUILD_DIRECTORY/include/LightGBM/config.h || exit -1  # make sure that changes were really done
-        # by default ``gpu_use_dp=false`` for efficiency. change to ``true`` here for exact results in ci tests
-        sed -i'.bak' 's/gpu_use_dp = false;/gpu_use_dp = true;/' $BUILD_DIRECTORY/include/LightGBM/config.h
-        grep -q 'gpu_use_dp = true' $BUILD_DIRECTORY/include/LightGBM/config.h || exit -1  # make sure that changes were really done
-    fi
+elif [[ $TASK == "cuda" ]]; then
+    sed -i'.bak' 's/std::string device_type = "cpu";/std::string device_type = "cuda";/' $BUILD_DIRECTORY/include/LightGBM/config.h
+    grep -q 'std::string device_type = "cuda"' $BUILD_DIRECTORY/include/LightGBM/config.h || exit -1  # make sure that changes were really done
+    # by default ``gpu_use_dp=false`` for efficiency. change to ``true`` here for exact results in ci tests
+    sed -i'.bak' 's/gpu_use_dp = false;/gpu_use_dp = true;/' $BUILD_DIRECTORY/include/LightGBM/config.h
+    grep -q 'gpu_use_dp = true' $BUILD_DIRECTORY/include/LightGBM/config.h || exit -1  # make sure that changes were really done
     if [[ $METHOD == "pip" ]]; then
         cd $BUILD_DIRECTORY/python-package && python setup.py sdist || exit -1
-        if [[ $TASK == "cuda" ]]; then
-            pip install --user $BUILD_DIRECTORY/python-package/dist/lightgbm-$LGB_VER.tar.gz -v --install-option=--cuda || exit -1
-        else
-            pip install --user $BUILD_DIRECTORY/python-package/dist/lightgbm-$LGB_VER.tar.gz -v --install-option=--cuda-exp || exit -1
-        fi
+        pip install --user $BUILD_DIRECTORY/python-package/dist/lightgbm-$LGB_VER.tar.gz -v --install-option=--cuda || exit -1
         pytest $BUILD_DIRECTORY/tests/python_package_test || exit -1
         exit 0
     elif [[ $METHOD == "wheel" ]]; then
-        if [[ $TASK == "cuda" ]]; then
-            cd $BUILD_DIRECTORY/python-package && python setup.py bdist_wheel --cuda || exit -1
-        else
-            cd $BUILD_DIRECTORY/python-package && python setup.py bdist_wheel --cuda-exp || exit -1
-        fi
+        cd $BUILD_DIRECTORY/python-package && python setup.py bdist_wheel --cuda || exit -1
         pip install --user $BUILD_DIRECTORY/python-package/dist/lightgbm-$LGB_VER*.whl -v || exit -1
         pytest $BUILD_DIRECTORY/tests || exit -1
         exit 0
     elif [[ $METHOD == "source" ]]; then
-        if [[ $TASK == "cuda" ]]; then
-            cmake -DUSE_CUDA=ON ..
-        else
-            cmake -DUSE_CUDA_EXP=ON ..
-        fi
+        cmake -DUSE_CUDA=ON ..
     fi
 elif [[ $TASK == "mpi" ]]; then
     if [[ $METHOD == "pip" ]]; then

.github/workflows/cuda.yml

@@ -28,31 +28,21 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - method: source
-            compiler: gcc
-            python_version: "3.8"
-            cuda_version: "11.7.1"
-            task: cuda
-          - method: pip
-            compiler: clang
-            python_version: "3.9"
-            cuda_version: "10.0"
-            task: cuda
           - method: wheel
             compiler: gcc
             python_version: "3.10"
-            cuda_version: "9.0"
+            cuda_version: "11.7.1"
             task: cuda
           - method: source
             compiler: gcc
             python_version: "3.8"
-            cuda_version: "11.7.1"
-            task: cuda_exp
+            cuda_version: "10.0"
+            task: cuda
           - method: pip
             compiler: clang
             python_version: "3.9"
-            cuda_version: "10.0"
-            task: cuda_exp
+            cuda_version: "11.7.1"
+            task: cuda
     steps:
       - name: Setup or update software on host machine
         run: |

CMakeLists.txt

@@ -4,8 +4,7 @@ option(USE_GPU "Enable GPU-accelerated training" OFF)
 option(USE_SWIG "Enable SWIG to generate Java API" OFF)
 option(USE_HDFS "Enable HDFS support (EXPERIMENTAL)" OFF)
 option(USE_TIMETAG "Set to ON to output time costs" OFF)
-option(USE_CUDA "Enable CUDA-accelerated training (EXPERIMENTAL)" OFF)
-option(USE_CUDA_EXP "Enable CUDA-accelerated training with more acceleration (EXPERIMENTAL)" OFF)
+option(USE_CUDA "Enable CUDA-accelerated training " OFF)
 option(USE_DEBUG "Set to ON for Debug mode" OFF)
 option(USE_SANITIZER "Use santizer flags" OFF)
 set(
@@ -31,7 +30,7 @@ elseif(USE_SWIG)
   cmake_minimum_required(VERSION 3.8)
 elseif(USE_GPU OR APPLE)
   cmake_minimum_required(VERSION 3.2)
-elseif(USE_CUDA OR USE_CUDA_EXP)
+elseif(USE_CUDA)
   cmake_minimum_required(VERSION 3.16)
 else()
   cmake_minimum_required(VERSION 3.0)
@@ -137,7 +136,7 @@ else()
     add_definitions(-DUSE_SOCKET)
 endif()
 
-if(USE_CUDA OR USE_CUDA_EXP)
+if(USE_CUDA)
     set(CMAKE_CUDA_HOST_COMPILER "${CMAKE_CXX_COMPILER}")
     enable_language(CUDA)
     set(USE_OPENMP ON CACHE BOOL "CUDA requires OpenMP" FORCE)
@@ -192,12 +191,8 @@ if(__INTEGRATE_OPENCL)
     endif()
 endif()
 
-if(USE_CUDA OR USE_CUDA_EXP)
-    if(USE_CUDA)
-      find_package(CUDA 9.0 REQUIRED)
-    else()
-      find_package(CUDA 10.0 REQUIRED)
-    endif()
+if(USE_CUDA)
+    find_package(CUDA 10.0 REQUIRED)
     include_directories(${CUDA_INCLUDE_DIRS})
     set(CMAKE_CUDA_FLAGS "${CMAKE_CUDA_FLAGS} -Xcompiler=${OpenMP_CXX_FLAGS} -Xcompiler=-fPIC -Xcompiler=-Wall")
 
@@ -224,11 +219,7 @@ if(USE_CUDA OR USE_CUDA_EXP)
     endif()
     message(STATUS "CMAKE_CUDA_FLAGS: ${CMAKE_CUDA_FLAGS}")
 
-    if(USE_CUDA)
-      add_definitions(-DUSE_CUDA)
-    elseif(USE_CUDA_EXP)
-      add_definitions(-DUSE_CUDA_EXP)
-    endif()
+    add_definitions(-DUSE_CUDA)
 
     if(NOT DEFINED CMAKE_CUDA_STANDARD)
       set(CMAKE_CUDA_STANDARD 11)
@@ -411,10 +402,8 @@ file(
       src/objective/*.cpp
       src/network/*.cpp
       src/treelearner/*.cpp
-if(USE_CUDA OR USE_CUDA_EXP)
+if(USE_CUDA)
       src/treelearner/*.cu
-endif()
-if(USE_CUDA_EXP)
       src/boosting/cuda/*.cpp
       src/boosting/cuda/*.cu
       src/metric/cuda/*.cpp
@@ -549,7 +538,7 @@ if(__INTEGRATE_OPENCL)
   target_link_libraries(lightgbm_objs PUBLIC ${INTEGRATED_OPENCL_LIBRARIES} ${CMAKE_DL_LIBS})
 endif()
 
-if(USE_CUDA OR USE_CUDA_EXP)
+if(USE_CUDA)
   # Disable cmake warning about policy CMP0104. Refer to issue #3754 and PR #4268.
   # Custom target properties does not propagate, thus we need to specify for
   # each target that contains or depends on cuda source.

docs/Installation-Guide.rst

@@ -605,8 +605,8 @@ Docker
 
 Refer to `GPU Docker folder <https://github.com/microsoft/LightGBM/tree/master/docker/gpu>`__.
 
-Build CUDA Version (Experimental)
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Build CUDA Version
+~~~~~~~~~~~~~~~~~~
 
 The `original GPU build <#build-gpu-version>`__ of LightGBM (``device_type=gpu``) is based on OpenCL.
 
@@ -621,7 +621,7 @@ On Linux a CUDA version of LightGBM can be built using **CUDA**, **CMake** and *
 
 The following dependencies should be installed before compilation:
 
--  **CUDA** 9.0 or later libraries. Please refer to `this detailed guide`_. Pay great attention to the minimum required versions of host compilers listed in the table from that guide and use only recommended versions of compilers.
+-  **CUDA** 10.0 or later libraries. Please refer to `this detailed guide`_. Pay great attention to the minimum required versions of host compilers listed in the table from that guide and use only recommended versions of compilers.
 
 -  **CMake** 3.16 or later.
 
@@ -636,8 +636,6 @@ To build LightGBM CUDA version, run the following commands:
   cmake -DUSE_CUDA=1 ..
   make -j4
 
-Recently, a new CUDA version with better efficiency is implemented as an experimental feature. To build the new CUDA version, replace ``-DUSE_CUDA`` with ``-DUSE_CUDA_EXP`` in the above commands. Please note that new version requires **CUDA** 10.0 or later libraries.
-
 **Note**: glibc >= 2.14 is required.
 
 **Note**: In some rare cases you may need to install OpenMP runtime library separately (use your package manager and search for ``lib[g|i]omp`` for doing this).

docs/Parameters.rst

@@ -205,20 +205,22 @@ Core Parameters
 
    -  **Note**: please **don't** change this during training, especially when running multiple jobs simultaneously by external packages, otherwise it may cause undesirable errors
 
--  ``device_type`` :raw-html:`<a id="device_type" title="Permalink to this parameter" href="#device_type">&#x1F517;&#xFE0E;</a>`, default = ``cpu``, type = enum, options: ``cpu``, ``gpu``, ``cuda``, ``cuda_exp``, aliases: ``device``
+-  ``device_type`` :raw-html:`<a id="device_type" title="Permalink to this parameter" href="#device_type">&#x1F517;&#xFE0E;</a>`, default = ``cpu``, type = enum, options: ``cpu``, ``gpu``, ``cuda``, aliases: ``device``
 
-   -  device for the tree learning, you can use GPU to achieve the faster learning
+   -  device for the tree learning
+
+   -  ``cpu`` supports all LightGBM functionality and is portable across the widest range of operating systems and hardware
+
+   -  ``cuda`` offers faster training than ``gpu`` or ``cpu``, but only works on GPUs supporting CUDA
+
+   -  ``gpu`` can be faster than ``cpu`` and works on a wider range of GPUs than CUDA
 
    -  **Note**: it is recommended to use the smaller ``max_bin`` (e.g. 63) to get the better speed up
 
    -  **Note**: for the faster speed, GPU uses 32-bit float point to sum up by default, so this may affect the accuracy for some tasks. You can set ``gpu_use_dp=true`` to enable 64-bit float point, but it will slow down the training
 
    -  **Note**: refer to `Installation Guide <./Installation-Guide.rst#build-gpu-version>`__ to build LightGBM with GPU support
 
-   -  **Note**: ``cuda_exp`` is an experimental CUDA version, the installation guide for ``cuda_exp`` is identical with ``cuda``
-
-   -  **Note**: ``cuda_exp`` is faster than ``cuda`` and will replace ``cuda`` in the future
-
 -  ``seed`` :raw-html:`<a id="seed" title="Permalink to this parameter" href="#seed">&#x1F517;&#xFE0E;</a>`, default = ``None``, type = int, aliases: ``random_seed``, ``random_state``
 
    -  this seed is used to generate other seeds, e.g. ``data_random_seed``, ``feature_fraction_seed``, etc.

include/LightGBM/bin.h

@@ -480,13 +480,13 @@ class MultiValBin {
 
   virtual MultiValBin* Clone() = 0;
 
-  #ifdef USE_CUDA_EXP
+  #ifdef USE_CUDA
   virtual const void* GetRowWiseData(uint8_t* bit_type,
     size_t* total_size,
     bool* is_sparse,
     const void** out_data_ptr,
     uint8_t* data_ptr_bit_type) const = 0;
-  #endif  // USE_CUDA_EXP
+  #endif  // USE_CUDA
 };
 
 inline uint32_t BinMapper::ValueToBin(double value) const {

include/LightGBM/config.h

@@ -223,14 +223,15 @@ struct Config {
 
   // [doc-only]
   // type = enum
-  // options = cpu, gpu, cuda, cuda_exp
+  // options = cpu, gpu, cuda
   // alias = device
-  // desc = device for the tree learning, you can use GPU to achieve the faster learning
+  // desc = device for the tree learning
+  // desc = ``cpu`` supports all LightGBM functionality and is portable across the widest range of operating systems and hardware
+  // desc = ``cuda`` offers faster training than ``gpu`` or ``cpu``, but only works on GPUs supporting CUDA
+  // desc = ``gpu`` can be faster than ``cpu`` and works on a wider range of GPUs than CUDA
   // desc = **Note**: it is recommended to use the smaller ``max_bin`` (e.g. 63) to get the better speed up
   // desc = **Note**: for the faster speed, GPU uses 32-bit float point to sum up by default, so this may affect the accuracy for some tasks. You can set ``gpu_use_dp=true`` to enable 64-bit float point, but it will slow down the training
   // desc = **Note**: refer to `Installation Guide <./Installation-Guide.rst#build-gpu-version>`__ to build LightGBM with GPU support
-  // desc = **Note**: ``cuda_exp`` is an experimental CUDA version, the installation guide for ``cuda_exp`` is identical with ``cuda``
-  // desc = **Note**: ``cuda_exp`` is faster than ``cuda`` and will replace ``cuda`` in the future
   std::string device_type = "cpu";
 
   // [doc-only]

include/LightGBM/cuda/cuda_algorithms.hpp

@@ -6,7 +6,7 @@
 #ifndef LIGHTGBM_CUDA_CUDA_ALGORITHMS_HPP_
 #define LIGHTGBM_CUDA_CUDA_ALGORITHMS_HPP_
 
-#ifdef USE_CUDA_EXP
+#ifdef USE_CUDA
 
 #include <cuda.h>
 #include <cuda_runtime.h>
@@ -577,5 +577,5 @@ __device__ VAL_T PercentileDevice(const VAL_T* values,
 
 }  // namespace LightGBM
 
-#endif  // USE_CUDA_EXP
+#endif  // USE_CUDA
 #endif  // LIGHTGBM_CUDA_CUDA_ALGORITHMS_HPP_

include/LightGBM/cuda/cuda_column_data.hpp

@@ -3,7 +3,7 @@
  * Licensed under the MIT License. See LICENSE file in the project root for license information.
  */
 
-#ifdef USE_CUDA_EXP
+#ifdef USE_CUDA
 
 #ifndef LIGHTGBM_CUDA_CUDA_COLUMN_DATA_HPP_
 #define LIGHTGBM_CUDA_CUDA_COLUMN_DATA_HPP_
@@ -137,4 +137,4 @@ class CUDAColumnData {
 
 #endif  // LIGHTGBM_CUDA_CUDA_COLUMN_DATA_HPP_
 
-#endif  // USE_CUDA_EXP
+#endif  // USE_CUDA

include/LightGBM/cuda/cuda_metadata.hpp

@@ -3,7 +3,7 @@
  * Licensed under the MIT License. See LICENSE file in the project root for license information.
  */
 
-#ifdef USE_CUDA_EXP
+#ifdef USE_CUDA
 
 #ifndef LIGHTGBM_CUDA_CUDA_METADATA_HPP_
 #define LIGHTGBM_CUDA_CUDA_METADATA_HPP_
@@ -55,4 +55,4 @@ class CUDAMetadata {
 
 #endif  // LIGHTGBM_CUDA_CUDA_METADATA_HPP_
 
-#endif  // USE_CUDA_EXP
+#endif  // USE_CUDA

include/LightGBM/cuda/cuda_metric.hpp

@@ -7,7 +7,7 @@
 #ifndef LIGHTGBM_CUDA_CUDA_METRIC_HPP_
 #define LIGHTGBM_CUDA_CUDA_METRIC_HPP_
 
-#ifdef USE_CUDA_EXP
+#ifdef USE_CUDA
 
 #include <LightGBM/metric.h>
 
@@ -36,6 +36,6 @@ class CUDAMetricInterface: public HOST_METRIC {
 
 }  // namespace LightGBM
 
-#endif  // USE_CUDA_EXP
+#endif  // USE_CUDA
 
 #endif  // LIGHTGBM_CUDA_CUDA_METRIC_HPP_

include/LightGBM/cuda/cuda_objective_function.hpp

@@ -7,7 +7,7 @@
 #ifndef LIGHTGBM_CUDA_CUDA_OBJECTIVE_FUNCTION_HPP_
 #define LIGHTGBM_CUDA_CUDA_OBJECTIVE_FUNCTION_HPP_
 
-#ifdef USE_CUDA_EXP
+#ifdef USE_CUDA
 
 #include <LightGBM/cuda/cuda_utils.h>
 #include <LightGBM/objective_function.h>
@@ -73,6 +73,6 @@ class CUDAObjectiveInterface: public HOST_OBJECTIVE {
 
 }  // namespace LightGBM
 
-#endif  // USE_CUDA_EXP
+#endif  // USE_CUDA
 
 #endif  // LIGHTGBM_CUDA_CUDA_OBJECTIVE_FUNCTION_HPP_

include/LightGBM/cuda/cuda_random.hpp

@@ -5,7 +5,7 @@
 #ifndef LIGHTGBM_CUDA_CUDA_RANDOM_HPP_
 #define LIGHTGBM_CUDA_CUDA_RANDOM_HPP_
 
-#ifdef USE_CUDA_EXP
+#ifdef USE_CUDA
 
 #include <cuda.h>
 #include <cuda_runtime.h>
@@ -69,6 +69,6 @@ class CUDARandom {
 
 }  // namespace LightGBM
 
-#endif  // USE_CUDA_EXP
+#endif  // USE_CUDA
 
 #endif  // LIGHTGBM_CUDA_CUDA_RANDOM_HPP_

include/LightGBM/cuda/cuda_row_data.hpp

@@ -3,7 +3,7 @@
  * Licensed under the MIT License. See LICENSE file in the project root for license information.
  */
 
-#ifdef USE_CUDA_EXP
+#ifdef USE_CUDA
 
 #ifndef LIGHTGBM_CUDA_CUDA_ROW_DATA_HPP_
 #define LIGHTGBM_CUDA_CUDA_ROW_DATA_HPP_
@@ -176,4 +176,4 @@ class CUDARowData {
 }  // namespace LightGBM
 #endif  // LIGHTGBM_CUDA_CUDA_ROW_DATA_HPP_
 
-#endif  // USE_CUDA_EXP
+#endif  // USE_CUDA

include/LightGBM/cuda/cuda_split_info.hpp

@@ -4,7 +4,7 @@
  * license information.
  */
 
-#ifdef USE_CUDA_EXP
+#ifdef USE_CUDA
 
 #ifndef LIGHTGBM_CUDA_CUDA_SPLIT_INFO_HPP_
 #define LIGHTGBM_CUDA_CUDA_SPLIT_INFO_HPP_
@@ -102,4 +102,4 @@ class CUDASplitInfo {
 
 #endif  // LIGHTGBM_CUDA_CUDA_SPLIT_INFO_HPP_
 
-#endif  // USE_CUDA_EXP
+#endif  // USE_CUDA