[BE] Use nested namespaces in .cpp/.cu files (pytorch#92100)

As we live in C++17 world

This is a functional no-op, just
- `s/namespace at { namespace native {/namespace at::native {/`
- `s/namespace torch { namespace jit {/namespace torch::jit {/`

Pull Request resolved: pytorch#92100
Approved by: https://github.com/izaitsevfb

Author: malfet

aten/src/ATen/ConjugateFallback.cpp

@@ -1,8 +1,7 @@
 #include <ATen/native/MathBitsFallback.h>
 #include <ATen/native/MathBitFallThroughLists.h>
 
-namespace at {
-namespace native {
+namespace at::native {
 struct ConjFallback : MathOpFallback {
   ConjFallback() : MathOpFallback(DispatchKey::Conjugate, "conjugate") {}
   bool is_bit_set(const Tensor& tensor) override {
@@ -63,5 +62,4 @@ TORCH_LIBRARY_IMPL(aten, Conjugate, m) {
   TORCH_VIEW_FNS_NATIVE_FN_REGISTRATION(m)
 }
 
-}
-} // namespace at
+} // namespace at::native

aten/src/ATen/Dispatch.cpp

@@ -1,7 +1,7 @@
 #include <ATen/Dispatch.h>
 #include <ATen/record_function.h>
 
-namespace at { namespace detail {
+namespace at::detail {
 
 void record_kernel_function_dtype(std::string name) {
   RECORD_FUNCTION_WITH_SCOPE(
@@ -10,4 +10,4 @@ void record_kernel_function_dtype(std::string name) {
         c10::ArrayRef<const c10::IValue>{});
 }
 
-}}  // namespace at::detail
+}  // namespace at::detail

aten/src/ATen/native/cpu/Activation.cpp

@@ -19,8 +19,7 @@
 
 #include <c10/core/Scalar.h>
 
-namespace at {
-namespace native {
+namespace at::native {
 
 namespace {
 
@@ -1403,5 +1402,4 @@ REGISTER_DISPATCH(mish_backward_stub, &mish_backward_kernel);
 REGISTER_DISPATCH(prelu_stub, &prelu_kernel);
 REGISTER_DISPATCH(prelu_backward_stub, &prelu_backward_kernel);
 
-} // namespace native
-} // namespace at
+} // namespace at::native

aten/src/ATen/native/cpu/AdaptiveAvgPoolKernel.cpp

@@ -8,7 +8,7 @@
 #include <ATen/native/cpu/utils.h>
 #include <c10/util/irange.h>
 
-namespace at { namespace native {
+namespace at::native {
 
 namespace {
 
@@ -413,4 +413,4 @@ void adapative_avg_pool2d_backward_kernel_impl(
 REGISTER_DISPATCH(adaptive_avg_pool2d_kernel, &adaptive_avg_pool2d_kernel_impl);
 REGISTER_DISPATCH(adaptive_avg_pool2d_backward_kernel, &adapative_avg_pool2d_backward_kernel_impl);
 
-}} // at::native
+} // at::native

aten/src/ATen/native/cpu/AdaptiveMaxPoolKernel.cpp

@@ -8,7 +8,7 @@
 #include <ATen/native/cpu/utils.h>
 #include <c10/util/irange.h>
 
-namespace at { namespace native {
+namespace at::native {
 
 namespace {
 
@@ -485,4 +485,4 @@ void adaptive_max_pool2d_backward_kernel_impl(
 REGISTER_DISPATCH(adaptive_max_pool2d_kernel, &adaptive_max_pool2d_kernel_impl);
 REGISTER_DISPATCH(adaptive_max_pool2d_backward_kernel, &adaptive_max_pool2d_backward_kernel_impl);
 
-}} // at::native
+} // at::native

aten/src/ATen/native/cpu/AvgPoolKernel.cpp

@@ -7,7 +7,7 @@
 #include <ATen/native/cpu/utils.h>
 #include <c10/util/irange.h>
 
-namespace at { namespace native {
+namespace at::native {
 
 namespace {
 
@@ -549,4 +549,4 @@ void avg_pool2d_backward_kernel_impl(
 REGISTER_DISPATCH(avg_pool2d_kernel, &avg_pool2d_kernel_impl);
 REGISTER_DISPATCH(avg_pool2d_backward_kernel, &avg_pool2d_backward_kernel_impl);
 
-}} // at::native
+} // at::native

aten/src/ATen/native/cpu/BinaryOpsKernel.cpp

@@ -15,8 +15,7 @@
 #include <c10/util/TypeSafeSignMath.h>
 #include <c10/util/copysign.h>
 
-namespace at {
-namespace native {
+namespace at::native {
 
 namespace {
 
@@ -1273,5 +1272,4 @@ REGISTER_DISPATCH(shifted_chebyshev_polynomial_u_stub, &shifted_chebyshev_polyno
 REGISTER_DISPATCH(shifted_chebyshev_polynomial_v_stub, &shifted_chebyshev_polynomial_v_kernel);
 REGISTER_DISPATCH(shifted_chebyshev_polynomial_w_stub, &shifted_chebyshev_polynomial_w_kernel);
 
-} // namespace native
-} // namespace at
+} // namespace at::native

aten/src/ATen/native/cpu/BlasKernel.cpp

@@ -4,8 +4,7 @@
 #include <c10/util/irange.h>
 #include <c10/util/Unroll.h>
 
-namespace at {
-namespace native {
+namespace at::native {
 namespace cpublas {
 namespace {
 
@@ -248,4 +247,4 @@ REGISTER_DISPATCH(cpublas::gemm_stub, &cpublas::cpublas_gemm_impl);
 REGISTER_DISPATCH(cpublas::axpy_stub, &cpublas::cpublas_axpy_impl);
 REGISTER_DISPATCH(cpublas::copy_stub, &cpublas::cpublas_copy_impl);
 
-}}  // namespace at::native
+}  // namespace at::native

aten/src/ATen/native/cpu/CatKernel.cpp

@@ -7,7 +7,7 @@
 #include <ATen/cpu/vec/vec.h>
 #include <c10/util/irange.h>
 
-namespace at { namespace native {
+namespace at::native {
 
 namespace {
 
@@ -65,4 +65,4 @@ void cat_serial_kernel(const Tensor& result, const MaterializedITensorListRef& t
 
 REGISTER_DISPATCH(cat_serial_stub, &cat_serial_kernel);
 
-}} // at::native
+} // at::native

aten/src/ATen/native/cpu/ChannelShuffleKernel.cpp

@@ -8,7 +8,7 @@
 #include <ATen/cpu/vec/vec.h>
 #include <c10/util/irange.h>
 
-namespace at { namespace native {
+namespace at::native {
 
 namespace {
 
@@ -113,4 +113,4 @@ void channel_shuffle_kernel_impl(
 
 REGISTER_DISPATCH(channel_shuffle_kernel, &channel_shuffle_kernel_impl);
 
-}} // at::native
+} // at::native

aten/src/ATen/native/cpu/ComplexKernel.cpp

@@ -4,8 +4,7 @@
 #include <ATen/native/TensorIterator.h>
 #include <ATen/native/cpu/Loops.h>
 
-namespace at {
-namespace native {
+namespace at::native {
 namespace {
 
 void complex_kernel(TensorIterator& iter) {
@@ -29,5 +28,4 @@ void polar_kernel(TensorIterator& iter) {
 REGISTER_DISPATCH(complex_stub, &complex_kernel);
 REGISTER_DISPATCH(polar_stub, &polar_kernel);
 
-} // namespace native
-} // namespace at
+} // namespace at::native

aten/src/ATen/native/cpu/CopyKernel.cpp

@@ -8,8 +8,7 @@
 #include <ATen/TensorIteratorInternal.h>
 #include <ATen/Parallel.h>
 
-namespace at {
-namespace native {
+namespace at::native {
 inline namespace CPU_CAPABILITY {
 void neg_kernel(TensorIteratorBase &iter);
 void conj_kernel(TensorIteratorBase &iter);
@@ -271,5 +270,4 @@ void copy_kernel(TensorIterator& iter, bool /*non_blocking*/) {
 
 REGISTER_DISPATCH(copy_stub, &copy_kernel);
 
-} // namespace native
-} // namespace at
+} // namespace at::native

aten/src/ATen/native/cpu/CrossKernel.cpp

@@ -11,7 +11,8 @@
 #include <ATen/Parallel.h>
 #include <ATen/TensorIterator.h>
 #include <c10/util/irange.h>
-namespace at { namespace native { namespace {
+namespace at::native {
+namespace {
 
 template<typename scalar_t>
 static void apply_cross(const Tensor& result, const Tensor& a, const Tensor& b, const int64_t dim) {
@@ -77,4 +78,4 @@ static void cross_kernel_impl(const Tensor& result, const Tensor& a, const Tenso
 
 REGISTER_DISPATCH(cross_stub, &cross_kernel_impl);
 
-}} // namespace at::native
+} // namespace at::native

aten/src/ATen/native/cpu/DepthwiseConvKernel.cpp

@@ -15,8 +15,7 @@
 #include <arm_neon.h>
 #endif
 
-namespace at {
-namespace native {
+namespace at::native {
 namespace {
 
 struct Arguments final {
@@ -313,5 +312,4 @@ Tensor _convolution_depthwise3x3_winograd(
 
 REGISTER_DISPATCH(convolution_depthwise3x3_winograd_stub, &_convolution_depthwise3x3_winograd);
 
-}  // namespace native
-}  // namespace at
+}  // namespace at::native

aten/src/ATen/native/cpu/DistanceOpsKernel.cpp

@@ -10,7 +10,8 @@
 #include <ATen/cpu/vec/functional.h>
 #include <c10/util/irange.h>
 
-namespace at { namespace native { namespace {
+namespace at::native {
+namespace {
 
 template<typename scalar_t>
 struct Dist {
@@ -447,4 +448,4 @@ REGISTER_DISPATCH(pdist_backward_stub, &pdist_backward_kernel_impl);
 REGISTER_DISPATCH(cdist_stub, &cdist_kernel_impl);
 REGISTER_DISPATCH(cdist_backward_stub, &cdist_backward_kernel_impl);
 
-}}  // namespace at::native
+}  // namespace at::native

aten/src/ATen/native/cpu/DistributionKernels.cpp

@@ -23,7 +23,7 @@
 #include <cpuinfo.h>
 #endif
 
-namespace at { namespace native {
+namespace at::native {
 namespace {
 
 static void cauchy_kernel(TensorIteratorBase& iter, double median, double sigma, c10::optional<Generator> gen) {
@@ -237,5 +237,4 @@ REGISTER_DISPATCH(random_from_to_stub, &random_from_to_kernel);
 REGISTER_DISPATCH(random_full_64_bits_range_stub, &random_full_64_bits_range_kernel);
 REGISTER_DISPATCH(random_stub, &random_kernel);
 
-} // namespace native
-} // namespace at
+} // namespace at::native

aten/src/ATen/native/cpu/FillKernel.cpp

@@ -9,7 +9,7 @@
 #include <ATen/native/Fill.h>
 #include <c10/core/Scalar.h>
 
-namespace at { namespace native {
+namespace at::native {
 namespace {
 
 
@@ -58,5 +58,4 @@ void fill_kernel(TensorIterator& iter, const Scalar& value_scalar) {
 
 REGISTER_DISPATCH(fill_stub, &fill_kernel);
 
-} // namespace native
-} // namespace at
+} // namespace at::native

aten/src/ATen/native/cpu/FunctionOfAMatrixUtilsKernel.cpp

@@ -11,7 +11,7 @@
 #define RESTRICT __restrict__
 #endif
 
-namespace at { namespace native {
+namespace at::native {
 
 namespace {
 
@@ -54,4 +54,4 @@ void _compute_linear_combination_cpu_kernel(
 
 REGISTER_DISPATCH(_compute_linear_combination_stub, &_compute_linear_combination_cpu_kernel);
 
-}} // namespace at::native
+} // namespace at::native

aten/src/ATen/native/cpu/GridSamplerKernel.cpp

@@ -14,7 +14,7 @@
 #include <cstring>
 #include <type_traits>
 
-namespace at { namespace native { namespace {
+namespace at::native { namespace {
 
 /**  NOTE [ Grid Sample CPU Kernels ]
  *
@@ -1319,4 +1319,4 @@ REGISTER_DISPATCH(grid_sampler_2d_cpu_kernel, &grid_sampler_2d_cpu_kernel_impl);
 REGISTER_DISPATCH(grid_sampler_2d_backward_cpu_kernel, &grid_sampler_2d_backward_cpu_kernel_impl);
 
 
-}}  // namespace at::native
+}  // namespace at::native

aten/src/ATen/native/cpu/HistogramKernel.cpp

@@ -19,7 +19,7 @@
 #include <numeric>
 #include <functional>
 
-namespace at { namespace native {
+namespace at::native {
 
 namespace {
 
@@ -288,4 +288,4 @@ REGISTER_DISPATCH(histogramdd_stub, &histogramdd_kernel_impl);
 
 REGISTER_DISPATCH(histogramdd_linear_stub, &histogramdd_linear_kernel_impl);
 
-}} // namespace at::native
+} // namespace at::native

aten/src/ATen/native/cpu/IndexKernel.cpp

@@ -15,7 +15,7 @@
 #include <c10/util/irange.h>
 #include <c10/core/Scalar.h>
 
-namespace at { namespace native {
+namespace at::native {
 namespace {
 
 using namespace vec;
@@ -584,4 +584,4 @@ REGISTER_DISPATCH(masked_select_stub, &masked_select_kernel);
 REGISTER_DISPATCH(masked_scatter_stub, &masked_scatter_kernel);
 REGISTER_DISPATCH(flip_stub, &flip_kernel);
 
-}} // namespace at::native
+} // namespace at::native

aten/src/ATen/native/cpu/LinearAlgebraKernel.cpp

@@ -8,7 +8,7 @@
 #include <ATen/native/cpu/Loops.h>
 #include <c10/util/irange.h>
 
-namespace at { namespace native { namespace {
+namespace at::native { namespace {
 
 void addr_kernel(TensorIterator &iter,
                  const Scalar& beta, const Scalar& alpha) {
@@ -86,4 +86,4 @@ void addr_kernel(TensorIterator &iter,
 } // anonymous namespace
 
 REGISTER_DISPATCH(addr_stub, &addr_kernel);
-}} // namespace at::native
+} // namespace at::native

aten/src/ATen/native/cpu/MaxPoolKernel.cpp

@@ -9,7 +9,7 @@
 #include <ATen/native/cpu/utils.h>
 #include <c10/util/irange.h>
 
-namespace at { namespace native {
+namespace at::native {
 
 namespace {
 
@@ -508,4 +508,4 @@ void max_pool2d_backward_kernel_impl(
 REGISTER_DISPATCH(max_pool2d_kernel, &max_pool2d_kernel_impl);
 REGISTER_DISPATCH(max_pool2d_backward_kernel, &max_pool2d_backward_kernel_impl);
 
-}} // at::native
+} // at::native

aten/src/ATen/native/cpu/MaxPooling.cpp

@@ -6,8 +6,7 @@
 #include <ATen/native/MaxPooling.h>
 #include <c10/util/irange.h>
 
-namespace at {
-namespace native {
+namespace at::native {
 
 namespace {
 
@@ -57,5 +56,4 @@ void max_pool1d_impl(
 
 REGISTER_DISPATCH(max_pool1d_stub, &max_pool1d_impl);
 
-} // namespace native
-} // namespace at
+} // namespace at::native

aten/src/ATen/native/cpu/MaxUnpoolKernel.cpp

@@ -9,7 +9,7 @@
 
 #include <c10/util/Optional.h>
 
-namespace at { namespace native {
+namespace at::native {
 
 namespace {
 
@@ -269,4 +269,4 @@ void max_unpool3d_kernel_impl(
 REGISTER_DISPATCH(max_unpool2d_kernel, &max_unpool2d_kernel_impl);
 REGISTER_DISPATCH(max_unpool3d_kernel, &max_unpool3d_kernel_impl);
 
-}} // at::native
+} // at::native