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#pragma once
#include <c10/core/AutogradState.h>
#include <c10/macros/Export.h>
namespace c10 {
struct C10_API GradMode {
static bool is_enabled();
static void set_enabled(bool enabled);
};
// A RAII, thread local (!) guard that enables or disables grad mode upon
// construction, and sets it back to the original value upon destruction.
struct C10_API AutoGradMode {
AutoGradMode(bool enabled) : prev_mode(GradMode::is_enabled()) {
GradMode::set_enabled(enabled);
}
AutoGradMode(const AutoGradMode&) = delete;
AutoGradMode(AutoGradMode&&) = delete;
AutoGradMode& operator=(const AutoGradMode&) = delete;
AutoGradMode& operator=(AutoGradMode&&) = delete;
~AutoGradMode() {
GradMode::set_enabled(prev_mode);
}
bool prev_mode;
};
// A RAII, thread local (!) guard that stops future operations from building
// gradients.
struct C10_API NoGradGuard : public AutoGradMode {
NoGradGuard() : AutoGradMode(/*enabled=*/false) {}
};
// A RAII, thread local (!) guard that enables or disables forward grad mode
// upon construction, and sets it back to the original value upon destruction.
struct C10_API AutoFwGradMode {
AutoFwGradMode(bool enabled)
: prev_mode(AutogradState::get_tls_state().get_fw_grad_mode()) {
AutogradState::get_tls_state().set_fw_grad_mode(enabled);
}
AutoFwGradMode(const AutoFwGradMode&) = delete;
AutoFwGradMode(AutoFwGradMode&&) = delete;
AutoFwGradMode& operator=(const AutoFwGradMode&) = delete;
AutoFwGradMode& operator=(AutoFwGradMode&&) = delete;
~AutoFwGradMode() {
AutogradState::get_tls_state().set_fw_grad_mode(prev_mode);
}
bool prev_mode;
};
} // namespace c10
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