c10::nullopt -> std::nullopt (#2515)

Summary:
Pull Request resolved: #2515

X-link: pytorch/executorch#6461

X-link: pytorch/audio#3848

X-link: pytorch/ao#1151

X-link: facebookincubator/AITemplate#1032

Reviewed By: houseroad

Differential Revision: D64835967

fbshipit-source-id: 9f9f65335aaf5497680561027ef9314e4b36f8d9

Author: r-barnes

torchrec/inference/include/torchrec/inference/GPUExecutor.h

@@ -58,7 +58,7 @@ class GPUExecutor {
       std::shared_ptr<IGPUExecutorObserver>
           observer, // shared_ptr because used in completion executor callback
       std::function<void()> warmupFn = {},
-      std::optional<size_t> numThreadsPerGPU = c10::nullopt,
+      std::optional<size_t> numThreadsPerGPU = std::nullopt,
       std::unique_ptr<GCConfig> gcConfig = std::make_unique<GCConfig>());
   GPUExecutor(GPUExecutor&& executor) noexcept = default;
   GPUExecutor& operator=(GPUExecutor&& executor) noexcept = default;

torchrec/inference/include/torchrec/inference/Validation.h

@@ -20,7 +20,7 @@ namespace torchrec {
 bool validateSparseFeatures(
     at::Tensor& values,
     at::Tensor& lengths,
-    std::optional<at::Tensor> maybeWeights = c10::nullopt);
+    std::optional<at::Tensor> maybeWeights = std::nullopt);
 
 // Returns whether dense features are valid.
 // Currently validates:

torchrec/inference/inference_legacy/include/torchrec/inference/GPUExecutor.h

@@ -58,7 +58,7 @@ class GPUExecutor {
       std::shared_ptr<IGPUExecutorObserver>
           observer, // shared_ptr because used in completion executor callback
       std::function<void()> warmupFn = {},
-      std::optional<size_t> numThreadsPerGPU = c10::nullopt,
+      std::optional<size_t> numThreadsPerGPU = std::nullopt,
       std::unique_ptr<GCConfig> gcConfig = std::make_unique<GCConfig>());
   GPUExecutor(GPUExecutor&& executor) noexcept = default;
   GPUExecutor& operator=(GPUExecutor&& executor) noexcept = default;

torchrec/inference/inference_legacy/include/torchrec/inference/Validation.h

@@ -20,7 +20,7 @@ namespace torchrec {
 bool validateSparseFeatures(
     at::Tensor& values,
     at::Tensor& lengths,
-    std::optional<at::Tensor> maybeWeights = c10::nullopt);
+    std::optional<at::Tensor> maybeWeights = std::nullopt);
 
 // Returns whether dense features are valid.
 // Currently validates: