chore: import upstream snapshot with attribution

paddle/phi/kernels/funcs/sequence2batch.cc

@@ -0,0 +1,79 @@
+/* Copyright (c) 2016 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. */
+
+#include "paddle/phi/kernels/funcs/sequence2batch.h"
+
+namespace phi::funcs {
+
+template <typename T>
+class CopyMatrixRowsFunctor<CPUContext, T> {
+ public:
+  void operator()(const CPUContext& dev_ctx UNUSED,
+                  const DenseTensor& src,
+                  Vector<size_t> index_lod,
+                  DenseTensor* dst,
+                  bool is_src_index) {
+    size_t* index = index_lod.data();
+    const auto& src_dims = vectorize<int>(src.dims());
+    const auto& dst_dims = vectorize<int>(dst->dims());
+    PADDLE_ENFORCE_EQ(src_dims.size(),
+                      2UL,
+                      common::errors::InvalidArgument(
+                          "The source tensor must be a matrix with rank 2, but "
+                          "got the source tensor rank is %lu. "
+                          "Please check the rank of the source tensor",
+                          src_dims.size()));
+    PADDLE_ENFORCE_EQ(
+        dst_dims.size(),
+        2UL,
+        common::errors::InvalidArgument(
+            "The destination tensor must be a matrix with rank 2, "
+            "but got the destination tensor rank is %lu. "
+            "Please check the rank of the destination tensor",
+            dst_dims.size()));
+    PADDLE_ENFORCE_EQ(
+        src_dims[1],
+        dst_dims[1],
+        common::errors::InvalidArgument(
+            "The width of the source tensor and the destination tensor must be "
+            "same. But got %lu != %lu. Please check the rank of the source "
+            "tensor",
+            src_dims.size(),
+            dst_dims.size()));
+    auto height = dst_dims[0];
+    auto width = dst_dims[1];
+    auto* src_data = src.data<T>();
+    auto* dst_data = dst->data<T>();
+    const int sz = width * sizeof(T);
+    if (is_src_index) {
+      for (int i = 0; i < height; ++i) {
+        memcpy(dst_data + i * width, src_data + index[i] * width, sz);
+      }
+    } else {
+      for (int i = 0; i < height; ++i) {
+        memcpy(dst_data + index[i] * width, src_data + i * width, sz);
+      }
+    }
+  }
+};
+
+template class CopyMatrixRowsFunctor<CPUContext, float>;
+template class CopyMatrixRowsFunctor<CPUContext, double>;
+
+template class DenseTensor2BatchFunctor<CPUContext, float>;
+template class DenseTensor2BatchFunctor<CPUContext, double>;
+template class Batch2DenseTensorFunctor<CPUContext, float>;
+template class Batch2DenseTensorFunctor<CPUContext, double>;
+
+}  // namespace phi::funcs