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kronos-venv/lib/python3.12/site-packages/torch/include/ATen/Parallel.h

@@ -0,0 +1,163 @@
+#if !defined(TORCH_STABLE_ONLY) && !defined(TORCH_TARGET_VERSION)
+#pragma once
+#include <ATen/Config.h>
+#include <c10/macros/Macros.h>
+#include <functional>
+#include <string>
+
+namespace at {
+
+inline int64_t divup(int64_t x, int64_t y) {
+  return (x + y - 1) / y;
+}
+
+// Called during new thread initialization
+TORCH_API void init_num_threads();
+
+// Sets the number of threads to be used in parallel region
+TORCH_API void set_num_threads(int /*nthreads*/);
+
+// Returns the maximum number of threads that may be used in a parallel region
+TORCH_API int get_num_threads();
+
+// Returns the current thread number (starting from 0)
+// in the current parallel region, or 0 in the sequential region
+TORCH_API int get_thread_num();
+
+// Checks whether the code runs in parallel region
+TORCH_API bool in_parallel_region();
+
+namespace internal {
+
+// Initialise num_threads lazily at first parallel call
+inline void lazy_init_num_threads() {
+  thread_local bool init = false;
+  if (C10_UNLIKELY(!init)) {
+    at::init_num_threads();
+    init = true;
+  }
+}
+
+TORCH_API void set_thread_num(int /*id*/);
+
+class TORCH_API ThreadIdGuard {
+ public:
+  ThreadIdGuard(int new_id) : old_id_(at::get_thread_num()) {
+    set_thread_num(new_id);
+  }
+
+  ~ThreadIdGuard() {
+    set_thread_num(old_id_);
+  }
+
+ private:
+  int old_id_;
+};
+
+} // namespace internal
+
+/*
+parallel_for
+
+begin: index at which to start applying user function
+
+end: index at which to stop applying user function
+
+grain_size: number of elements per chunk. impacts the degree of parallelization
+
+f: user function applied in parallel to the chunks, signature:
+  void f(int64_t begin, int64_t end)
+
+Warning: parallel_for does NOT copy thread local
+states from the current thread to the worker threads.
+This means for example that Tensor operations CANNOT be used in the
+body of your function, only data pointers.
+*/
+template <class F>
+inline void parallel_for(
+    const int64_t begin,
+    const int64_t end,
+    const int64_t grain_size,
+    const F& f);
+
+/*
+parallel_reduce
+
+begin: index at which to start applying reduction
+
+end: index at which to stop applying reduction
+
+grain_size: number of elements per chunk. impacts number of elements in
+intermediate results tensor and degree of parallelization.
+
+ident: identity for binary combination function sf. sf(ident, x) needs to return
+x.
+
+f: function for reduction over a chunk. f needs to be of signature scalar_t
+f(int64_t partial_begin, int64_t partial_end, scalar_t identify)
+
+sf: function to combine two partial results. sf needs to be of signature
+scalar_t sf(scalar_t x, scalar_t y)
+
+For example, you might have a tensor of 10000 entries and want to sum together
+all the elements. Parallel_reduce with a grain_size of 2500 will then allocate
+an intermediate result tensor with 4 elements. Then it will execute the function
+"f" you provide and pass the beginning and end index of these chunks, so
+0-2499, 2500-4999, etc. and the combination identity. It will then write out
+the result from each of these chunks into the intermediate result tensor. After
+that it'll reduce the partial results from each chunk into a single number using
+the combination function sf and the identity ident. For a total summation this
+would be "+" and 0 respectively. This is similar to tbb's approach [1], where
+you need to provide a function to accumulate a subrange, a function to combine
+two partial results and an identity.
+
+Warning: parallel_reduce does NOT copy thread local
+states from the current thread to the worker threads.
+This means for example that Tensor operations CANNOT be used in the
+body of your function, only data pointers.
+
+[1] https://software.intel.com/en-us/node/506154
+*/
+template <class scalar_t, class F, class SF>
+inline scalar_t parallel_reduce(
+    const int64_t begin,
+    const int64_t end,
+    const int64_t grain_size,
+    const scalar_t ident,
+    const F& f,
+    const SF& sf);
+
+// Returns a detailed string describing parallelization settings
+TORCH_API std::string get_parallel_info();
+
+// Sets number of threads used for inter-op parallelism
+TORCH_API void set_num_interop_threads(int /*nthreads*/);
+
+// Returns the number of threads used for inter-op parallelism
+TORCH_API size_t get_num_interop_threads();
+
+// Launches inter-op parallel task
+TORCH_API void launch(std::function<void()> func);
+namespace internal {
+void launch_no_thread_state(std::function<void()> fn);
+} // namespace internal
+
+// Launches intra-op parallel task
+TORCH_API void intraop_launch(const std::function<void()>& func);
+
+// Returns number of intra-op threads used by default
+TORCH_API int intraop_default_num_threads();
+
+} // namespace at
+
+#if AT_PARALLEL_OPENMP
+#include <ATen/ParallelOpenMP.h> // IWYU pragma: keep
+#elif AT_PARALLEL_NATIVE
+#include <ATen/ParallelNative.h> // IWYU pragma: keep
+#endif
+
+#include <ATen/Parallel-inl.h> // IWYU pragma: keep
+
+#else
+#error "This file should not be included when either TORCH_STABLE_ONLY or TORCH_TARGET_VERSION is defined."
+#endif  // !defined(TORCH_STABLE_ONLY) && !defined(TORCH_TARGET_VERSION)