chore: import upstream snapshot with attribution

paddle/phi/api/include/compat/ATen/ops/allclose.h

@@ -0,0 +1,57 @@
+// Copyright (c) 2026 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#include <ATen/core/Tensor.h>
+
+#include "paddle/phi/api/include/api.h"
+#include "paddle/phi/common/data_type.h"
+#include "paddle/phi/common/scalar.h"
+
+namespace at {
+
+// allclose: Check if two tensors are close to each other
+inline bool allclose(const at::Tensor& self,
+                     const at::Tensor& other,
+                     double rtol = 1e-05,
+                     double atol = 1e-08,
+                     bool equal_nan = false) {
+  // Paddle's allclose returns a Tensor, but PyTorch's allclose returns bool.
+  // The allclose kernel always sets output dtype to phi::DataType::BOOL via
+  // kernel->OutputAt(0).SetDataType(phi::DataType::BOOL), so we read BOOL
+  // directly.
+  PaddleTensor result = paddle::experimental::allclose(self._PD_GetInner(),
+                                                       other._PD_GetInner(),
+                                                       phi::Scalar(rtol),
+                                                       phi::Scalar(atol),
+                                                       equal_nan);
+  auto* result_tensor =
+      std::dynamic_pointer_cast<phi::DenseTensor>(result.impl()).get();
+  return *result_tensor->data<bool>();
+}
+
+}  // namespace at
+
+namespace at {
+
+// Tensor member function implementation
+inline bool Tensor::allclose(const at::Tensor& other,
+                             double rtol,
+                             double atol,
+                             bool equal_nan) const {
+  return at::allclose(*this, other, rtol, atol, equal_nan);
+}
+
+}  // namespace at