From 9303b0951407880dca4ddac6aaf2fa9c9c737b53 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=9F=B3=E6=99=93=E4=BC=9F?=
 <39303645+Shixiaowei02@users.noreply.github.com>
Date: Fri, 12 Nov 2021 10:44:55 +0800
Subject: [PATCH] add the shallow clone member func of the dense tensor,
 test=develop (#37146)

---
 paddle/pten/core/dense_tensor.h             |  6 ++++++
 paddle/pten/core/tensor_meta.h              |  7 +++++++
 paddle/pten/tests/core/test_dense_tensor.cc | 15 +++++++++++++++
 3 files changed, 28 insertions(+)

diff --git a/paddle/pten/core/dense_tensor.h b/paddle/pten/core/dense_tensor.h
index 9354f92e7d..8c2b711015 100644
--- a/paddle/pten/core/dense_tensor.h
+++ b/paddle/pten/core/dense_tensor.h
@@ -172,6 +172,12 @@ class DenseTensor : public TensorBase,
   /// \return The const data pointer value of raw type.
   const void* data() const;
 
+  /// \brief Get the shallow clone of current tensor.
+  /// \return The shallow clone of current tensor.
+  DenseTensor shallow_clone() const {
+    return DenseTensor(copy_intrusive(storage_), meta_);
+  }
+
  private:
   friend class CompatibleDenseTensorUtils;
 
diff --git a/paddle/pten/core/tensor_meta.h b/paddle/pten/core/tensor_meta.h
index 85afc3f2f0..a7cba706dd 100644
--- a/paddle/pten/core/tensor_meta.h
+++ b/paddle/pten/core/tensor_meta.h
@@ -82,4 +82,11 @@ inline bool DenseTensorMeta::valid() const noexcept {
   return valid;
 }
 
+inline bool operator==(const DenseTensorMeta& lhs, const DenseTensorMeta& rhs) {
+  bool ret = true;
+  return ret && (lhs.is_scalar == rhs.is_scalar) && (lhs.dims == rhs.dims) &&
+         (lhs.type == rhs.type) && (lhs.layout == rhs.layout) &&
+         (lhs.lod == rhs.lod);
+}
+
 }  // namespace pten
diff --git a/paddle/pten/tests/core/test_dense_tensor.cc b/paddle/pten/tests/core/test_dense_tensor.cc
index dac2575713..59f6732075 100644
--- a/paddle/pten/tests/core/test_dense_tensor.cc
+++ b/paddle/pten/tests/core/test_dense_tensor.cc
@@ -125,5 +125,20 @@ TEST(dense_tensor, resize) {
   CHECK_EQ(storage->size(), 6u);
 }
 
+TEST(dense_tensor, shallow_clone) {
+  const DDim dims({1, 2});
+  const DataType dtype{DataType::INT8};
+  const DataLayout layout{DataLayout::NHWC};
+  const std::vector<std::vector<size_t>> lod{};
+  DenseTensorMeta meta(dtype, dims, layout, lod);
+
+  auto alloc = std::make_shared<FancyAllocator>();
+  DenseTensor tensor_0(alloc, meta);
+
+  auto tensor_1 = tensor_0.shallow_clone();
+  CHECK(tensor_0.meta() == tensor_1.meta());
+  CHECK(tensor_0.release() == tensor_1.release());
+}
+
 }  // namespace tests
 }  // namespace pten
-- 
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