reuse main implementation for regression obkective for sycl

plugin/sycl/common/linalg_op.h

@@ -8,6 +8,8 @@
 #include <vector>
 #include <utility>
 
+#include "../../../src/common/linalg_op.h"
+
 #include "../data.h"
 #include "../device_manager.h"
 
@@ -69,6 +71,28 @@ void ElementWiseKernel(TensorView<T, D> t, Fn&& fn) {
   }).wait_and_throw();
 }
 
+template <typename T, int32_t D, typename Fn>
+bool Validate(DeviceOrd device, TensorView<T, D> t, Fn&& fn) {
+  sycl::DeviceManager device_manager;
+  auto* qu = device_manager.GetQueue(t.Device());
+
+  int flag = 0;
+  {
+    ::sycl::buffer<int> buff(&flag, 1);
+    size_t size = xgboost::linalg::cend(t) - xgboost::linalg::cbegin(t);
+    qu->submit([&](::sycl::handler& cgh) {
+      auto reduction = ::sycl::reduction(buff, cgh, ::sycl::maximum<>());
+      cgh.parallel_for<>(::sycl::range<1>(size), reduction,
+                        [=](::sycl::id<1> pid, auto& max) {
+        const size_t i = pid[0];
+        auto it = xgboost::linalg::cbegin(t) + i;
+        max.combine(!const_cast<Fn&&>(fn)(*it));
+      });
+    }).wait_and_throw();
+  }
+  return (flag == 0);
+}
+
 }  // namespace linalg
 }  // namespace sycl
 

plugin/sycl/common/transform.h

@@ -0,0 +1,35 @@
+/**
+ * Copyright 2021-2024, XGBoost Contributors
+ * \file transform.h
+ */
+#ifndef PLUGIN_SYCL_COMMON_TRANSFORM_H_
+#define PLUGIN_SYCL_COMMON_TRANSFORM_H_
+
+#include "../device_manager.h"
+
+#include <sycl/sycl.hpp>
+
+namespace xgboost {
+namespace sycl {
+namespace common {
+
+template <typename Functor, typename... SpanType>
+void LaunchSyclKernel(DeviceOrd device, Functor&& _func, xgboost::common::Range _range,
+                      SpanType... _spans) {
+  sycl::DeviceManager device_manager;
+  auto* qu = device_manager.GetQueue(device);
+
+  size_t size = *(_range.end());
+  qu->submit([&](::sycl::handler& cgh) {
+    cgh.parallel_for<>(::sycl::range<1>(size),
+                       [=](::sycl::id<1> pid) {
+      const size_t idx = pid[0];
+      const_cast<Functor&&>(_func)(idx, _spans...);
+    });
+  }).wait();
+}
+
+}  // namespace common
+}  // namespace sycl
+}  // namespace xgboost
+#endif  // PLUGIN_SYCL_COMMON_TRANSFORM_H_

src/common/stats.cc

@@ -66,7 +66,7 @@ void Mean(Context const* ctx, linalg::Vector<float> const& v, linalg::Vector<flo
 void SampleMean(Context const* ctx, bool is_column_split, linalg::Matrix<float> const& v,
                 linalg::Vector<float>* out) {
   *out = linalg::Zeros<float>(ctx, std::max(v.Shape(1), decltype(v.Shape(1)){1}));
-  if (ctx->IsCPU()) {
+  if (!ctx->IsCUDA()) {
     auto h_v = v.HostView();
     CHECK(h_v.CContiguous());
     std::int64_t n_samples = v.Shape(0);
@@ -94,7 +94,7 @@ void WeightedSampleMean(Context const* ctx, bool is_column_split, linalg::Matrix
                         HostDeviceVector<float> const& w, linalg::Vector<float>* out) {
   *out = linalg::Zeros<float>(ctx, std::max(v.Shape(1), decltype(v.Shape(1)){1}));
   CHECK_EQ(v.Shape(0), w.Size());
-  if (ctx->IsCPU()) {
+  if (!ctx->IsCUDA()) {
     auto h_v = v.HostView();
     auto h_w = w.ConstHostSpan();
     auto sum_w = std::accumulate(h_w.data(), h_w.data() + h_w.size(), 0.0);

src/common/transform.h

@@ -21,6 +21,10 @@
 #include "device_helpers.cuh"
 #endif  // defined (__CUDACC__)
 
+#if defined (SYCL_LANGUAGE_VERSION)
+#include "../plugin/sycl/common/transform.h"
+#endif // defined (SYCL_LANGUAGE_VERSION)
+
 namespace xgboost {
 namespace common {
 
@@ -71,10 +75,10 @@ class Transform {
      */
     template <typename... HDV>
     void Eval(HDV... vectors) const {
-      bool on_device = device_.IsCUDA();
-
-      if (on_device) {
+      if (device_.IsCUDA()) {
         LaunchCUDA(func_, vectors...);
+      } else if (device_.IsSycl()) {
+        LaunchSycl(func_, vectors...);
       } else {
         LaunchCPU(func_, vectors...);
       }
@@ -160,6 +164,22 @@ class Transform {
     }
 #endif  // defined(__CUDACC__)
 
+#if defined (SYCL_LANGUAGE_VERSION)
+    template <typename... HDV>
+    void LaunchSycl(Functor _func, HDV*... _vectors) const {
+      UnpackShard(device_, _vectors...);
+
+      size_t range_size = *range_.end() - *range_.begin();
+      Range shard_range {0, static_cast<Range::DifferenceType>(range_size)};
+      sycl::common::LaunchSyclKernel(device_, _func, shard_range, UnpackHDVOnDevice(_vectors)...);
+    }
+#else
+    template <typename... HDV>
+    void LaunchSycl(Functor _func, HDV *... _vectors) const {
+      LaunchCPU(_func, _vectors...);
+    }
+#endif  // defined(SYCL_LANGUAGE_VERSION)
+
     template <typename... HDV>
     void LaunchCPU(Functor func, HDV *...vectors) const {
       omp_ulong end = static_cast<omp_ulong>(*(range_.end()));

src/objective/regression_obj.cu

@@ -87,6 +87,15 @@ class RegLossObj : public FitInterceptGlmLike {
           common::AssertGPUSupport();
           return false;
 #endif  // defined(XGBOOST_USE_CUDA)
+        },
+        [&] {
+#if defined(XGBOOST_USE_SYCL)
+          return sycl::linalg::Validate(ctx_->Device(), label,
+                                        [](float y) -> bool { return Loss::CheckLabel(y); });
+#else
+          common::AssertSYCLSupport();
+          return false;
+#endif  // defined(XGBOOST_USE_SYCL)
         });
     if (!valid) {
       LOG(FATAL) << Loss::LabelErrorMsg();