Remove the legacy backend RNG

CHANGELOG.md

@@ -41,12 +41,15 @@ This release drops support for Python 3.10, making Python 3.11 the minimum requi
 * Deprecated the upcast of `arr` by a Python numeric scalar in `dpnp.append` with `axis=None` (e.g. `int8` array and `1` giving `int64`) [#3125](https://github.com/IntelPython/dpnp/pull/3125)
 * Deprecated `dpnp.isfortran`; use `a.flags.fnc` instead [#3140](https://github.com/IntelPython/dpnp/pull/3140)
 * Deprecated omitting `axis` in `dpnp.tensor.top_k` for an input that is not 1-D, which searches the flattened array; the default will change to `axis=-1` as in the Array API standard, so pass `axis=None` to keep the current behavior [#3133](https://github.com/IntelPython/dpnp/pull/3133)
+* Deprecated `dpnp.config.__DPNP_RAISE_EXCEPION_ON_NUMPY_FALLBACK__`, set by the `DPNP_RAISE_EXCEPION_ON_NUMPY_FALLBACK` environment variable, which has no effect without the NumPy fallback; reading or setting it now emits a `DeprecationWarning` [#3163](https://github.com/IntelPython/dpnp/pull/3163)
 
 ### Removed
 
 * Removed the unused `FourZeroOffsets_Indexer`, `FixedDimStridedIndexer` and `ThreeOffsets_FixedDimStridedIndexer` from the libtensor header `utils/offset_utils.hpp` [#3131](https://github.com/IntelPython/dpnp/pull/3131)
 * Dropped support for Python 3.10 [#3173](https://github.com/IntelPython/dpnp/pull/3173)
 * Removed the `USE_GROUP_LOAD_STORE` macro from the libtensor header `utils/sycl_utils.hpp`, so `sub_group_load` and `sub_group_store` always use the `sycl_ext_oneapi_group_load_store` extension; the `sycl::sub_group` member load/store fallback it selected does not compile with DPC++ 2026.0, the minimum supported compiler [#3174](https://github.com/IntelPython/dpnp/pull/3174)
+* Removed the legacy backend implementation of `dpnp.random`, which no longer needs `onemkl-sycl-rng` [#3163](https://github.com/IntelPython/dpnp/pull/3163)
+* Removed the unused parts of the legacy `dpnp_backend_c` library, including its empty GTest suite, the `DPNP_BACKEND_TESTS` CMake option and the NumPy fallback helper `call_origin` [#3163](https://github.com/IntelPython/dpnp/pull/3163)
 
 ### Fixed
 

CMakeLists.txt

@@ -42,7 +42,6 @@ option(
     "Build dpnp tensor pybind11 offloading extensions with coverage instrumentation"
     OFF
 )
-option(DPNP_BACKEND_TESTS "Enable building of DPNP backend test suite" OFF)
 option(
     DPNP_WITH_REDIST
     "Build DPNP assuming DPC++ redistributable is installed into Python prefix"

conda-recipe-cf/meta.yaml

@@ -14,6 +14,8 @@ build:
     - dpctl
     - numpy
     - python
+    # leaked from mkl-devel-dpcpp; drags in unused onemkl-sycl-{datafitting,rng,stats}
+    - mkl-dpcpp
     # building with Intel DPC++ and do not import the MSVC runtime DLLs
     - vc14_runtime  # [win]
     - ucrt          # [win]
@@ -54,7 +56,6 @@ requirements:
     - {{ pin_compatible('onemkl-sycl-blas', min_pin='x.x', max_pin='x') }}
     - {{ pin_compatible('onemkl-sycl-dft', min_pin='x.x', max_pin='x') }}
     - {{ pin_compatible('onemkl-sycl-lapack', min_pin='x.x', max_pin='x') }}
-    - {{ pin_compatible('onemkl-sycl-rng', min_pin='x.x', max_pin='x') }}
     - {{ pin_compatible('onemkl-sycl-vm', min_pin='x.x', max_pin='x') }}
     - numpy
     - ocl-icd-system  # [linux]

conda-recipe/meta.yaml

@@ -67,7 +67,6 @@ requirements:
       - {{ pin_compatible('onemkl-sycl-blas', min_pin='x.x', max_pin='x') }}
       - {{ pin_compatible('onemkl-sycl-dft', min_pin='x.x', max_pin='x') }}
       - {{ pin_compatible('onemkl-sycl-lapack', min_pin='x.x', max_pin='x') }}
-      - {{ pin_compatible('onemkl-sycl-rng', min_pin='x.x', max_pin='x') }}
       - {{ pin_compatible('onemkl-sycl-vm', min_pin='x.x', max_pin='x') }}
       - {{ pin_compatible('onemkl-sycl-sparse', min_pin='x.x', max_pin='x') }}
       - numpy
@@ -88,6 +87,8 @@ build:
       - dpctl
       - numpy
       - python
+      # leaked from mkl-devel-dpcpp; drags in unused onemkl-sycl-{datafitting,rng,stats}
+      - mkl-dpcpp
       # building with Intel DPC++ and do not import the MSVC runtime DLLs
       - vc14_runtime  # [win]
       - ucrt          # [win]

conda-recipe/rattler_recipe.yaml

@@ -67,7 +67,6 @@ requirements:
     - ${{ pin_compatible('onemkl-sycl-blas', lower_bound='x.x', upper_bound='x') }}
     - ${{ pin_compatible('onemkl-sycl-dft', lower_bound='x.x', upper_bound='x') }}
     - ${{ pin_compatible('onemkl-sycl-lapack', lower_bound='x.x', upper_bound='x') }}
-    - ${{ pin_compatible('onemkl-sycl-rng', lower_bound='x.x', upper_bound='x') }}
     - ${{ pin_compatible('onemkl-sycl-vm', lower_bound='x.x', upper_bound='x') }}
     - ${{ pin_compatible('onemkl-sycl-sparse', lower_bound='x.x', upper_bound='x') }}
     - numpy
@@ -80,7 +79,7 @@ requirements:
       - dpctl
       - numpy
       - python
-      # leaked from mkl-devel-dpcpp; drags in unused onemkl-sycl-{datafitting,stats}
+      # leaked from mkl-devel-dpcpp; drags in unused onemkl-sycl-{datafitting,rng,stats}
       - mkl-dpcpp
       # building with Intel DPC++ and do not import the MSVC runtime DLLs
       - if: win

dpnp/AGENTS.md

@@ -7,7 +7,7 @@
 - `dpnp_utils/`: shared helpers (`get_usm_allocations`, `map_dtype_to_device`, reduction wrappers)
 - `linalg/`, `fft/`, `random/`, `scipy/`, `lib/`: subpackages, each exporting through its own `__init__.py`
 - `random/`: `_bit_generator.py` (`BitGenerator`, `Philox4x3210`, `PCG64DXSM`, `MRG32k3a`; `SeedSequence` is NumPy's), `_generator.py` (`Generator`, which implements every distribution), `dpnp_random_state.py` (`RandomState`, the same samplers with NumPy's legacy checks) and `dpnp_iface_random.py` (module functions, one `RandomState` per queue). The kernels are in `dpnp.libtensor._rng_impl`.
-- Legacy, don't extend: the Cython `dpnp_algo` path and `dpnp_backend_c` (still used by `dpnp.partition` and `dpnp.random`), and the NumPy fallback `call_origin`. New kernels go into `dpnp/libtensor` (see `dpnp/libtensor/AGENTS.md`).
+- Legacy, don't extend: the Cython `dpnp_algo` path and `dpnp_backend_c` (still used by `dpnp.partition`). New kernels go into `dpnp/libtensor` (see `dpnp/libtensor/AGENTS.md`).
 
 ## Adding a Public Function
 1. Implement it in the matching `dpnp_iface_*.py` or subpackage module. Iface modules have no `__all__`.

dpnp/CMakeLists.txt

@@ -235,4 +235,3 @@ add_subdirectory(libtensor/extensions/sparse)
 
 add_subdirectory(dpnp_algo)
 add_subdirectory(dpnp_utils)
-add_subdirectory(random)

dpnp/backend/AGENTS.md

@@ -3,5 +3,5 @@
 Legacy, don't extend: new kernels and bindings go into `dpnp/libtensor` (see `dpnp/libtensor/AGENTS.md`, which also holds the C++ rules and build options).
 
 ## Layout
-- `src/`, `include/` and `kernels/dpnp_krnl_*.cpp` build `dpnp_backend_c` (still used by `dpnp.partition` and `dpnp.random`); `tests/` (GTest, `-DDPNP_BACKEND_TESTS=ON`) and `examples/` are not built in CI
+- `src/`, `include/` and `kernels/dpnp_krnl_*.cpp` build `dpnp_backend_c` (still used by `dpnp.partition`)
 - `cmake/Modules/`: vendored `IntelSYCL`, `MKL`, `TBB` and `oneDPL` config modules, used by the whole build

dpnp/backend/CMakeLists.txt

@@ -27,17 +27,7 @@
 # THE POSSIBILITY OF SUCH DAMAGE.
 # *****************************************************************************
 
-set(DPNP_SRC
-    kernels/dpnp_krnl_arraycreation.cpp
-    kernels/dpnp_krnl_common.cpp
-    kernels/dpnp_krnl_random.cpp
-    kernels/dpnp_krnl_sorting.cpp
-    src/dpnp_iface_fptr.cpp
-    src/memory_sycl.cpp
-    src/queue_sycl.cpp
-    src/verbose.cpp
-    src/dpnp_random_state.cpp
-)
+set(DPNP_SRC kernels/dpnp_krnl_sorting.cpp src/dpnp_iface_fptr.cpp)
 
 set(_trgt "dpnp_backend_c")
 
@@ -69,12 +59,6 @@ if(DPNP_GENERATE_COVERAGE)
     target_link_options(${_trgt} PRIVATE -fprofile-instr-generate -fcoverage-mapping)
 endif()
 
-# Link only the MKL SYCL domains actually used by the backend sources
-# (BLAS: mkl_blas::scal; RNG: engines/distributions; VM: vector math ops)
-target_link_libraries(
-    ${_trgt}
-    PUBLIC MKL::MKL_SYCL::BLAS MKL::MKL_SYCL::RNG MKL::MKL_SYCL::VM
-)
 target_link_libraries(${_trgt} PUBLIC oneDPL)
 
 if(UNIX)
@@ -103,10 +87,6 @@ if(DPNP_WITH_REDIST)
     set_target_properties(${_trgt} PROPERTIES INSTALL_RPATH "$ORIGIN/../../../")
 endif()
 
-if(DPNP_BACKEND_TESTS)
-    add_subdirectory(tests)
-endif()
-
 set(_lib_destination dpnp)
 set(_include_destination dpnp/backend/include)
 install(